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Littérature scientifique sur le sujet « Nucleotide sequence »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 29 juillet 2024

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Articles de revues sur le sujet "Nucleotide sequence"

Fatchiyah, Fatchiyah, Rista Nikmatu Rohmah, Lidwina Faraline Tripisila, Dewi Ratih Tirto Sari, Adelia Adrianne Tapiory, Jihan Safira Ainnayah, Viona Faiqoh, Fajar Mustika Alam et Ahmad Faizal Abdul Razis. « Three-dimension Glyceraldehyde-3-Phosphate Dehydrogenase protein structure of substitution and insertion sequences of GAPDH gene of chicken drumstick meat (Gallus gallus) ». Berkala Penelitian Hayati 27, n^o 2 (5 avril 2022) : 105–9. http://dx.doi.org/10.23869/bphjbr.27.2.20228.

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The study aimed to observed the 3-D structure of GAPDH protein and identify the GAPDH gene sequences mutation of chicken drumstick meat (Gallus gallus). The sample of chicken meat was randomly taken in four districts in Malang city. In this study, the DNA was isolated from drumstick meat chicken samples, amplified using proper primers, and then sequenced using ABI 3730xl DNA Sequencer. The DNA sequences alignments analyzed by BioEdit software and the control sequence of GAPDH gene was obtained from NCBI GenBank (sequence Gene ID: 374193). Then, the amino acid sequence and 3D structure of GAPDH protein were determined based on the change of nucleotide sequences using Swiss model and PyMol software. The nucleotide sequence of a partially GAPDH gene of drumstick meat chicken from districts two is completely different with a 97 percent similarity level, which found twelve nucleotides’ substitutions mutation between nucleotide base number 354 until 777 and three nucleotides inserted between T753 and G754 nucleotide base. These mutations changed the amino acid sequence and 3D structure of GAPDH protein. This result suggests that the differential drumstick chicken meat GAPDH sequences and 3D structure may induce the change of protein-protein interaction and induction.

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Harasawa, Ryô, et Yasuo Kanamoto. « Differentiation of Two Biovars of Ureaplasma urealyticum Based on the 16S-23S rRNA Intergenic Spacer Region ». Journal of Clinical Microbiology 37, n^o 12 (1999) : 4135–38. http://dx.doi.org/10.1128/jcm.37.12.4135-4138.1999.

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The 16S-23S rRNA intergenic spacer regions of 14 strains representing the 14 serovars of Ureaplasma urealyticum were amplified by PCR and sequenced for genetic differentiation between the two biovars Parvo and T960. Although the spacer region of the Parvo and T960 biovars comprised 302 nucleotides and lacked spacer tRNA genes, 15 nucleotides were different between the two biovars. The four nucleotide sequences of the 16S-23S rRNA intergenic spacer region of serovars 1, 3, 6, and 14 in the Parvo biovar were found to be identical. Similarly, the 10 nucleotide sequences of the 16S-23S rRNA intergenic spacer region of serovars 2, 4, 5, and 7 to 13 in the T960 biovar were found to be identical. The nucleotide sequence of the T960 biovar contains multiple restriction sites for restriction endonucleaseSspI, which allows differentiation of the T960 biovar from the Parvo biovar.

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Kuśmirek, Wiktor. « Estimated Nucleotide Reconstruction Quality Symbols of Basecalling Tools for Oxford Nanopore Sequencing ». Sensors 23, n^o 15 (29 juillet 2023) : 6787. http://dx.doi.org/10.3390/s23156787.

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Currently, one of the fastest-growing DNA sequencing technologies is nanopore sequencing. One of the key stages involved in processing sequencer data is the basecalling process, where the input sequence of currents measured on the nanopores of the sequencer reproduces the DNA sequences, called DNA reads. Many of the applications dedicated to basecalling, together with the DNA sequence, provide the estimated quality of the reconstruction of a given nucleotide (quality symbols are contained on every fourth line of the FASTQ file; each nucleotide in the FASTQ file corresponds to exactly one estimated nucleotide reconstruction quality symbol). Herein, we compare the estimated nucleotide reconstruction quality symbols (signs from every fourth line of the FASTQ file) reported by other basecallers. The conducted experiments consisted of basecalling the same raw datasets from the nanopore device by other basecallers and comparing the provided quality symbols, denoting the estimated quality of the nucleotide reconstruction. The results show that the estimated quality reported by different basecallers may vary, depending on the tool used, particularly in terms of range and distribution. Moreover, we mapped basecalled DNA reads to reference genomes and calculated matched and mismatched rates for groups of nucleotides with the same quality symbol. Finally, the presented paper shows that the estimated nucleotide reconstruction quality reported in the basecalling process is not used in any investigated tool for processing nanopore DNA reads.

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Bradford, Patricia A. « Automated Thermal Cycling Is Superior to Traditional Methods for Nucleotide Sequencing ofblaSHV Genes ». Antimicrobial Agents and Chemotherapy 43, n^o 12 (1 décembre 1999) : 2960–63. http://dx.doi.org/10.1128/aac.43.12.2960.

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ABSTRACT Genes encoding SHV-1 and SHV-2 were sequenced by different methods. Nucleotide sequencing of the coding strand by standard dideoxy-chain termination methods resulted in errors in the interpretation of the nucleotide sequence and the derived amino acid sequence in two main regions which corresponded to nucleotide and amino acid changes that had been reported previously. The automated thermal cycling method was clearly superior and consistently resulted in the correct sequences for these genes.

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Lee, Byoungsang, So Yeon Ahn, Charles Park, James J. Moon, Jung Heon Lee, Dan Luo, Soong Ho Um et Seung Won Shin. « Revealing the Presence of a Symbolic Sequence Representing Multiple Nucleotides Based on K-Means Clustering of Oligonucleotides ». Molecules 24, n^o 2 (18 janvier 2019) : 348. http://dx.doi.org/10.3390/molecules24020348.

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In biological systems, a few sequence differences diversify the hybridization profile of nucleotides and enable the quantitative control of cellular metabolism in a cooperative manner. In this respect, the information required for a better understanding may not be in each nucleotide sequence, but representative information contained among them. Existing methodologies for nucleotide sequence design have been optimized to track the function of the genetic molecule and predict interaction with others. However, there has been no attempt to extract new sequence information to represent their inheritance function. Here, we tried to conceptually reveal the presence of a representative sequence from groups of nucleotides. The combined application of the K-means clustering algorithm and the social network analysis theorem enabled the effective calculation of the representative sequence. First, a “common sequence” is made that has the highest hybridization property to analog sequences. Next, the sequence complementary to the common sequence is designated as a ‘representative sequence’. Based on this, we obtained a representative sequence from multiple analog sequences that are 8–10-bases long. Their hybridization was empirically tested, which confirmed that the common sequence had the highest hybridization tendency, and the representative sequence better alignment with the analogs compared to a mere complementary.

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Fukasawa, Kayoko M., Masako Tanimura, Ikuya Sakai, Farida S. Sharief, Fu-Zon Chung et Steven S.-L. Li. « Molecular Nature of Spontaneous Mutations in Mouse Lactate Dehydrogenase-A Processed Pseudogenes ». Genetics 115, n^o 1 (1 janvier 1987) : 177–84. http://dx.doi.org/10.1093/genetics/115.1.177.

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ABSTRACT The presence of at least ten mouse LDH-A pseudogenes was demonstrated in the genomic blot analysis, and four different processed pseudogenes have thus far been isolated and characterized. In this report, the nucleotide sequences of two different mouse lactate dehydrogenase-A processed pseudogenes, M11 and M14, were determined and compared with the protein-coding sequences of the mouse and rat LDH-A functional genes. In the pseudogene M11, the sequence of 64 nucleotides from codon no. 257 to 278 was tandemly duplicated. In the pseudogene M14, the sequence of 22 nucleotides from codon no. 68 to 75 was replaced by an inserted repetitive sequence of 242 nucleotides homologous to a mouse truncated R element. The pattern of nucleotide substitutions accumulated in mouse LDH-A pseudogenes M11 and M14, as well as that of pseudogene M10 identified previously, was analyzed, and the substitution frequencies of the C or G at the CG dinucleotide were found to be high.

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Furlong, N. Burr, et Koenraad Marien. « Further Observations on Periodicities of Nucleotide Occurrences in Natural DNA's ». Zeitschrift für Naturforschung C 40, n^o 11-12 (1 octobre 1985) : 854–57. http://dx.doi.org/10.1515/znc-1985-11-1218.

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Abstract There are non-random features in the occurrences of nucleotides in the DNA’s of certain organisms which are detectable by statistical analyses of the entire sequence. Earlier, using the bacteriophage Phi-X 174 DNA sequence, we had reported that the self-information values for one type of dinucleotide association showed a marked periodicity when their autocorrelation coefficients were graphed. A similar, but computationally simpler, analysis has been developed which gives a comparable indication of periodicity. The difference, in average autocorrelation coefficients obtained with this analysis, between the peak values and all others has been used as an index to compare the extent of periodic non-randomness for a series of natural DNA sequences and for various artificial sequences. Calculations show that triplet periodicity, the relationship between dinucleotides separated by a single nucleotide, is characteristic only of the natural sequences of certain filamentous phages and is not found prominently in any other DNA analyzed (including sequences of similar length from plasmids, yeast, bacteria and higher animals). By shuffling nucleotides in a given sequence or by substituting selected nucleotides to alter various positions in both periodic and aperiodic sequences, we have found that an excess or deficiency of a given nucleotide at one of the three positions in a triplet reading frame can simulate the periodic characteristic. Thus, it appears that this global statistical analysis detects the tendency for single strand phages to utilize a specific nucleotide, rather than one randomly selected, to constitute codons.

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Ojkic, Davor, et éva Nagy. « The complete nucleotide sequence of fowl adenovirus type 8 ». Microbiology 81, n^o 7 (1 juillet 2000) : 1833–37. http://dx.doi.org/10.1099/0022-1317-81-7-1833.

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The fowl adenovirus type 8 (FAdV-8) genome was sequenced and found to be 45063 nucleotides in length, the longest adenovirus (AdV) genome for which the complete nucleotide sequence has been determined so far. No regions homologous to early regions 1, 3 and 4 (E1, E3 and E4) of mastadenoviruses were recognized. Gene homologues for early region 2 (E2) proteins, intermediate protein IVa2 and late proteins were found by their similarities to protein sequences from other AdVs. However, sequences homologous to intermediate protein IX and late protein V could not be identified. Sequences for virus-associated RNA could also not be recognized. Two regions of repeated sequences were found on the FAdV-8 genome. The shorter repeat region contained five identical and contiguous direct repeats that were each 33 bp long, while the longer repeat region was made of 13 identical and contiguous, 135 bp long repeated subunits.

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Ansell, D. M., A. R. Samuel, W. C. Carpenter et N. J. Knowles. « Genetic relationships between foot–and–mouth disease type Asia 1 viruses ». Epidemiology and Infection 112, n^o 1 (février 1994) : 213–24. http://dx.doi.org/10.1017/s0950268800057587.

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SummaryThe sequence of 165 nucleotides at the 3´ end of the 1D (VP1) gene of foot-and-mouth disease (FMD) virus was determined for 44 type Asia 1 strains isolated from throughout Asia between 1954–92. Analysis of the relationships between the virus genomes showed epidemiological links not previously evident. The possible origin of the only outbreak of FMD Asia 1 to have occurred in Europe, in Greece in 1984, was identified because the nucleotide sequence of this virus was closely-related to the sequences of those present in the Middle East between 1983–5.Variation in the region sequenced was not as great as that seen in the other FMDV serotypes and all viruses shared greater than 85% nucleotide identity. Thus all the virus isolates examined were considered to belong to a single genotype.A database of Asia 1 virus sequences has been established which will facilitate the rapid analysis of new outbreaks strains.

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Mathis, Diane, et Christophe Benoist. « Nucleotide Sequence : Correction ». Science 279, n^o 5348 (9 janvier 1998) : 151.2–151. http://dx.doi.org/10.1126/science.279.5348.151-b.

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Thèses sur le sujet "Nucleotide sequence"

Wang, Zhenggang. « Improved algorithm for entropic segmentation of DNA sequence / ». View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202004%20WANG.

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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2004.
Includes bibliographical references (leaves 56-58). Also available in electronic version. Access restricted to campus users.

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Siu, Kim-Man. « A computational estimation of errors in model genomes using exactly duplicated DNA sequences / ». View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?MATH%202005%20SIU.

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Ngwira, Patricia. « Nucleotide sequence diversity in maize and grass-infecting streak geminiviruses : A basis for nucleotide sequence classification and identification / ». The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487945015618607.

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Cai, Zheng. « Repetitive sequence analysis for soybean genome sequences ». Diss., Columbia, Mo. : University of Missouri-Columbia, 2005. http://hdl.handle.net/10355/4249.

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Thesis (M.S.)--University of Missouri-Columbia, 2005.
"May 2005" The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Includes bibliographical references.

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Mohamed, Maizan. « Sequence analysis of the small (s) RNA segment of viruses in the genus Orthobunyavirus ». Thesis, St Andrews, 2007. http://hdl.handle.net/10023/434.

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Huckle, James William. « "Prokaryotic Metallothionein gene isolation, Nucleotide sequence and expression" ». Thesis, Durham University, 1993. http://etheses.dur.ac.uk/5662/.

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Metallothioneins (MTs) are low molecular weight, cysteine-rich, metal-binding proteins, which are proposed to have roles in essential trace metal homoeostasis and in the detoxification of metal ions. The genes encoding MTs have been isolated from a wide range of eukaryotes, although MT genes have not previously been isolated from prokaryotes. The polymerase chain reaction (PGR) was initially used to isolate a prokaryotic MT gene fragment from Synechococcus PCC 6301. PGR fragments were amplified using inosine-containing primers designed from the amino acid sequence of a prokaryotic MT. Subsequent cloning and nucleotide sequence analysis revealed that the deduced amino acid sequence of the PGR product corresponded to the amino acid sequence of the prokaryotic MT. The amplified product was thus part of the gene encoding the MT, and was designated smtA. The same primers used in the initial amplification were subsequently utilised for anchored PGR, to amplify the remainder of the coding region and the 3' and 5' flanking regions of the smtA gene. A genomic library was produced from Synechococcus PGG 7942 DNA and screened using the PGR products described above as probes. A genomic clone was isolated, nucleotide sequence analysis revealed the structure of the smt locus, two open reading frames, smtA and smtB, arranged in a divergent orientation about the smt operator/promoter region. The operator/promoter region contains the transcriptional and translational signals for the two genes and three regions that are candidate sites for interaction of regulatory proteins. The transcript start sites of the two genes were mapped within the operator/promoter region by primer extension analysis. An increase in the relative abundance of transcripts of both smt genes was studied in response to various metal ions in a series of northern blots. Inhibitor studies confirmed that the smtA gene is regulated at the transcriptional level. The 5' flanking region of the smtA gene conferred metal specific induction of the reporter gene lacZ. SmtB has sequence similarity to several prokaryotic regulatory proteins and contains a putative helix-turn-helix structural domain. Deletion analysis suggests that SmtB is a repressor of smtA expression. Subsequent work has confirmed that SmtB is a trans-acting repressor of expression from the smt operator/promoter.

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Earle, John Alexander Philip. « The nucleotide sequence of a bovine enterovirus genome ». Thesis, Queen's University Belfast, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317112.

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Halsall, John Richard. « Isolation and characterisation of the B42 mating type locus of Coprinus cinereus ». Thesis, University of Oxford, 1997. http://ora.ox.ac.uk/objects/uuid:d5340e8b-29d7-4418-be27-f0c06e10ca18.

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C. cinereus, any two of which are sufficient to promote B-regulated development following cell fusion. The isolation of the B42 locus is described along with the DNA sequence analysis that identified nine B mating type genes within a 27kb B42 -specific DNA sequence. Six of the genes, with small transcripts of 800-900nt, encode the mating pheromone precursors and the other three, with 1.9 to 2-5kb transcripts, encode the transmembrane pheromone receptors. The genes are arranged in three groups, designated group 1, 2 and 3, each consisting of one receptor gene and two pheromone genes. B42 and B6 share the same alleles of the group 1 genes, but not those of groups 2 and 3. This was demonstrated by DNAsequence analysis and Southern blot analysis. None of the group 1 genes from B42 were able to activate B -regulated development in a B6 host when introduced by transformation but with one exception, all genes from group 2 and group 3 were able to do so. This analysis led to the recognition that the three genes in any one group are held together in an allele-specific DNA sequence and that Southern blot analysis and transformation can be used to identify shared alleles in uncloned loci. Extensive Southern analyses using cloned genes to probe genomic DNAs from strains having other B mating specificites showed that different B loci may share identical alleles of two groups of genes. Mating partners thus require different alleles of only one group of genes to generate a compatible B mating interaction. Transformation analyses with the same cloned genes confirmed the conclusions derived from the hybridisation data. Multiple B mating specificities thus appear to be derived from three groups of multiallelic and functionally redundant genes. A tenth gene located within the B42- specific DNA sequence encodes a putative transporter protein belonging to the major facilitator superfamily (MFS). In other genomic backgrounds this gene lies in homologous flanking sequences and its presence within the B42 locus is unlikely to be related to mating type function.

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Musgrave-Brown, Esther. « Development and application of methods for targeted DNA sequencing of pooled samples ». Thesis, University of Cambridge, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648613.

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Cheng, Kai-hong. « Further development of the visual genome explorer a visual genomic comparative tool / ». Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk/hkuto/record.jsp?B23242437.

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Livres sur le sujet "Nucleotide sequence"

Ray, Gribskov Michael, et Devereux John 1947-, dir. Sequence analysis primer. New York : Oxford University Press, 1994.

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J, Atencio Edwin, GenBank, Europæiske molekylærbiologiske laboratorium, BBN Laboratories et Los Alamos National Laboratory, dir. Nucleotide sequences 1986/1987 : A compilation from the GenBank and EMBL data libraries. Orlando : Academic Press, 1987.

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John, Smith Bryan, dir. Protein sequencing protocols. 2^e éd. Totowa, N.J : Humana Press, 2002.

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P, Speed T., et Waterman Michael S, dir. Genetic mapping and DNA sequencing. New York : Springer, 1996.

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J, Harwood Adrian, dir. Protocols for gene analysis. Totowa, N.J : Humana Press, 1994.

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1958-, Gribskov Michael, et Devereux John 1947-, dir. Sequence analysis primer. Oxford : Oxford University Press, 1995.

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Alphey, Luke. DNA sequencing from experimental methods to bioinformatics. Oxford : Bios Scientific Publishers : Springer, 1997.

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1972-, Mayer Günter, dir. Nucleic acid and peptide aptamers : Methods and protocols. New York, NY : Humana, 2009.

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Riccardo, Cortese, dir. Combinatorial libraries : Synthesis, screening, and application potential. New York : Walter de Gruyter, 1996.

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Roe, Bruce A. DNA isolation and sequencing. New York : John Wiley & Sons, 1996.

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Chapitres de livres sur le sujet "Nucleotide sequence"

Kataja, M., et M. Sarvas. « Nucleotide Sequence Analysis System on Minicomputer ». Dans Medical Informatics Europe 85, 354–59. Berlin, Heidelberg : Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-93295-3_68.

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Staden, Rodger. « Staden : Statistical and Structural Analysis of Nucleotide Sequences ». Dans Computer Analysis of Sequence Data, 69–77. Totowa, NJ : Humana Press, 1994. http://dx.doi.org/10.1385/0-89603-276-0:69.

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Rice, Catherine M., et Graham N. « Submission of Nucleotide Sequence Data to EMBIVGenBank/DDB J ». Dans Computer Analysis of Sequence Data, 413–24. Totowa, NJ : Humana Press, 1994. http://dx.doi.org/10.1385/0-89603-276-0:413.

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Rosenberg, Aviv A., Alex M. Bronstein et Ailie Marx. « Recording Silence – Accurate Annotation of the Genetic Sequence Is Required to Better Understand How Synonymous Coding Affects Protein Structure and Disease ». Dans Single Nucleotide Polymorphisms, 37–47. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-05616-1_3.

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Wong, Dominic W. S. « Reading the Nucleotide Sequence of a Gene ». Dans The ABCs of Gene Cloning, 53–63. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-77982-9_6.

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Barrell, Bart G., et Paul J. Farrell. « Using Nucleotide Sequence Determination to Understand Viruses ». Dans Concepts in Viral Pathogenesis II, 25–31. New York, NY : Springer New York, 1986. http://dx.doi.org/10.1007/978-1-4612-4958-0_3.

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Syvänen, A. C., et H. Söderlund. « Nucleotide Sequence Determination As a Diagnostic Tool ». Dans Rapid Methods and Automation in Microbiology and Immunology, 23–26. Berlin, Heidelberg : Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-76603-9_4.

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González, Ernesto Álvarez, et Ricardo Balam-Narváez. « Computation of the Observed Spectral Sequence Spectrum for Nucleotide Sequence Alignments ». Dans Communications in Computer and Information Science, 34–47. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-81698-8_3.

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Sterk, Peter, Tamara Kulikova, Paul Kersey et Rolf Apweiler. « The EMBL Nucleotide Sequence and Genome Reviews Databases ». Dans Plant Bioinformatics, 1–21. Totowa, NJ : Humana Press, 2007. http://dx.doi.org/10.1007/978-1-59745-535-0_1.

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Civardi, L., M. Delledonne, M. Marudelli et C. Fogher. « Nucleotide sequence of regulatory regions of Azospirillum brasilense. » Dans Nitrogen Fixation, 283–84. Dordrecht : Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3486-6_47.

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Actes de conférences sur le sujet "Nucleotide sequence"

Kim, Sung-soo, Chan-hee Lee, Keon Lee et Sung-duk Lee. « A New Scheme for Nucleotide Sequence Signature Extraction ». Dans 2006 5th International Conference on Machine Learning and Applications (ICMLA'06). IEEE, 2006. http://dx.doi.org/10.1109/icmla.2006.9.

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Nastac, Iulian, et Rodica Tuduce. « An adaptive intelligent model for nucleotide sequence forecasting ». Dans 2010 4th International Symposium on Communications, Control and Signal Processing (ISCCSP). IEEE, 2010. http://dx.doi.org/10.1109/isccsp.2010.5463295.

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Roozgard, Aminmohammad, Nafise Barzigar, Shuang Wang, Xiaoqian Jiang, Lucila Ohno-Machado et Samuel Cheng. « Nucleotide sequence alignment using sparse coding and belief propagation ». Dans 2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2013. http://dx.doi.org/10.1109/embc.2013.6609568.

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Yang, Sisi. « Complete nucleotide sequence of the RA RagB/SusD gene ». Dans 2017 3rd International Forum on Energy, Environment Science and Materials (IFEESM 2017). Paris, France : Atlantis Press, 2018. http://dx.doi.org/10.2991/ifeesm-17.2018.178.

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Zhu, Li, Ming-zhou Li, Xue-wei Li, Su-rong Shuai, Qiang Li, Lei Chen et Yi-ren Gu. « The Nucleotide Sequence Diversity Analysis of the Pig MyoG Gene ». Dans 2008 2nd International Conference on Bioinformatics and Biomedical Engineering (ICBBE '08). IEEE, 2008. http://dx.doi.org/10.1109/icbbe.2008.32.

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Asante, Jessica, Destini McMillan et Juan Peticco. « Protein association and nucleotide sequence similarities among human alpha-papillomaviruses ». Dans 2016 IEEE Integrated STEM Education Conference (ISEC). IEEE, 2016. http://dx.doi.org/10.1109/isecon.2016.7457565.

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Li, Ying, Sanjie Cao, Yiping Wen et Xintian Wen. « Complete nucleotide sequence analysis of tolC gene from actinobacillus pleuropneumoniae ». Dans 2014 7th International Conference on Biomedical Engineering and Informatics (BMEI). IEEE, 2014. http://dx.doi.org/10.1109/bmei.2014.7002882.

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Holden, Todd, S. Dehipawala, E. Cheung, R. Bienaime, J. Ye, G. Tremberger, Jr., P. Schneider, D. Lieberman et T. Cheung. « Diverse nucleotide compositions and sequence fluctuation in Rubisco protein genes ». Dans SPIE Optical Engineering + Applications, sous la direction de Richard B. Hoover, Paul C. W. Davies, Gilbert V. Levin et Alexei Y. Rozanov. SPIE, 2011. http://dx.doi.org/10.1117/12.893434.

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Prokhorova, E. E., et R. R. Usmanova. « GENETIC POLYMORPHISM OF SNAILS SUCCINEA PUTRIS (GASTROPODA, PULMONATA) ». Dans V International Scientific Conference CONCEPTUAL AND APPLIED ASPECTS OF INVERTEBRATE SCIENTIFIC RESEARCH AND BIOLOGICAL EDUCATION. Tomsk State University Press, 2020. http://dx.doi.org/10.17223/978-5-94621-931-0-2020-33.

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Genotypic diversity of snails Succinea putris L. (Linnaeus, 1758) collected in the north-west of Russia and in the Republic of Belarus was analysed. Homology between the nucleotide sequences of snails from different population made up 100% by the nucleotide sequence of ITS1-5.8S-ITS2 region of rDNA. Genetic variability based on mitochondrial markers was insignificant. Average genetic distances between samples made up 0,009 for СOI gene loci and 0.008 for CytB gene loci. Was found ten haplotypes of the mitochondrial gene CytB and nine haplotypes of the mitochondrial gene СOI. Perhaps the genetic homogeneity of snails S. putris found in the study explains a low variability of their parasites, trematodes from the genus Leucochloridium.

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Kaida, S., T. Miyata, S. Kawabata, T. Morita, Y. Yoshizawa, H. Igarashi et S. Iwanaga. « NUCLEOTIDE SEQUENCE OF THE STAPHYLOCOAGULASE GENE FROM STAPHYLOCOCCUS AUREUS STRAIN BB ». Dans XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644607.

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Staphylocoagulase (SC) is a secretary protein produced by several strains of Staphylococcus aureus (S. aureus). This protein forms a molecular complex ("staphylothrombin") with human prothrombin in a molar ratio of 1:1. The complex displays the ability to clot fibrinogen and to hydrolyze the synthetic tripeptide substrates for α-thrombin. The formation of staphylothrombin does not require proteolytic cleavage of the prothrombin molecule, and this mechanism differs markedly from the activation process by either blood-clotting factor Xa or snake venom procoagulant.In the present studies, a pAT153 library containing partial Mbo I-digested DNA prepared from aureus strain BB has been screened with a fibrin gel formation method. The identity of these clones with SC was confirmed by DNA sequence analysis and by comparison of the derived amino acid sequence with that determined for the purified SC protein. One of the positive colonies was isolated and 3.1 Kb of the insert DNA was determined by the dideoxy chain termination method. The results indicated that the insert DNA consists of 148 bp 5' flanking region, protein coding region of 715 amino acids and 746 bp 3' flanking region, and that SC from strain BB is synthesized as a precursor with a signal peptide of 26 amino acids. Thus, the mature form was composed of 689 amino acids with a molecular weight of 77,337- The NH2-terminal sequence (324 amino acids) of SC isolated from S. aureus strain 213 (S. Kawabata et al. (1986): J. Biol. Chem. 261, 527-531) was compared with that of SC derived from strain BB. The sequence homology between them was found to show 57 %. It was also found that SC derived from strain BB was composed of 8 tandem repeats (27 amino acid residues in length) in the COOH-terminal region, although their functions are not known.

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Rapports d'organisations sur le sujet "Nucleotide sequence"

Steffenson, B. J., I. Mayrose, Gary J. Muehlbauer et A. Sharon. ing and comparative sequence analysis of powdery mildew and leaf rust resistance gene complements in wild barley. Israel : United States-Israel Binational Agricultural Research and Development Fund, 2021. http://dx.doi.org/10.32747/2021.8134173.bard.

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Our overall, long-term goal is to exploit the genetic diversity present in cereal wild relatives for the development of cultivars with durable disease resistance. Our specific objectives for this proposal were to: 1) Utilize Association Genetics Resistance Gene Enrichment Sequencing (AgRenSeq) to identify and clone powdery mildew and leaf rust resistance gene complements in wild barley and 2) Conduct comparative sequence analyses of the cloned resistance genes to elucidate the basis of their specificity and evolution. The deployment of resistant cultivars is the most effective, economically efficient, and environmentally sound means of controlling plant diseases, especially in small grain cereals. The systems selected for study in this proposal are barley (Hordeum vulgare ssp. vulgare, Hvv), its wild progenitor (Hordeum vulgare ssp. spontaneum, Hvs) and the powdery mildew (Blumeria graminis f. sp. hordei, Bgs) and leaf rust (Puccinia hordei, Ph) pathogens. We compiled a diverse panel of Hvs accessions (the Wild Barley Diversity Collection or WBDC; N = 314) from across its native range and evaluated it to 40 isolates of Bgs and 12 isolates of Ph. We obtained genomic DNA sequences enriched for Nucleotide Binding Site-Leucine Rich Repeat (NLR) type resistance genes for 203 WBDC accessions, plus cultivar Morex for which the first reference genome sequence of barley was based. We assembled the 250 bp Illumina sequencing reads into contigs using CLC assembly cell. From this effort, we successfully assembled the sequences of 201 WBDC accessions plus Morex and used NLR Parser to identify contigs containing NLR genes. AgRenSeq was then used to identify k-mers (short oligonucleotide sequences of length k) that were associated with resistance to each isolate of the two pathogens. This analysis was performed individually for all WBDC accessions and each individual pathogen race (9,898 host accession x pathogen race combinations). We visualized the results from these analyses in Manhattan plots and identified 311 and 144 peaks for powdery mildew and leaf rust resistance, respectively. The next step in the analysis was to identify the contigs associated with the peaks in the Manhattan plots. BLAST (Basic Local Alignment Search Tool) searches were employed to identify closely related contigs in other WBDC accessions or in Morex. We identified two candidate R genes that were only present in resistant WBDC accessions. One of these was present in seven WBDC lines and was associated with resistance to four leaf rust isolates. BLAST analysis of this gene revealed that it was Rph15, one of the most widely effective leaf rust resistance genes reported in Hordeum. This gene was cloned and functionally validated in association with our Australian colleagues (Cheng et al., 2021). We are currently in the process of cloning six of other resistance genes: four for powdery mildew and two for leaf rust. As the contigs do not contain much of the promoter sequences, we have employed a genome walking approach to identify 2,500 bp of promoter sequence. To speed up and simplify the cloning of resistance genes from the WBDC, the PI established the International Wild Barley Sequencing Consortium (IWBSC; https://iwbsc.umn.edu/) comprised of over 60 researchers from 14 different countries and raised over $150,000 through crowdfunding to pay for 10X depth sequence coverage. Genome-wide association study (GWAS) of whole genome sequencing (WGS) data identified extremely strong and clear signals of association for several resistance genes which will facilitate gene cloning in concert with a wild barley pan-genome currently under construction. The cloning of multiple resistance gene can facilitate the development of durably resistant cultivars by inserting, through transgenesis, cassettes of multiple resistance genes.

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Wang, Ying yuan, Zechang Chen, Luxin Zhang, Shuangyi Chen, Zhuomiao Ye, Tingting Xu et Yingying Zhang c. A systematic review and network meta-analysis : Role of SNPs in predicting breast carcinoma risk. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, février 2022. http://dx.doi.org/10.37766/inplasy2022.2.0092.

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Review question / Objective: P: Breast cancer patient; I: Single nucleotide polymorphisms associated with breast cancer risk; C: Healthy person; O: By comparing the proportion of SNP mutations in the tumor group and the control group, the effect of BREAST cancer risk-related SNP was investigated; S: Case-control study. Condition being studied: Breast cancer (BC) is one of the most common cancers among women, and its morbidity and mortality have continued to increase worldwide in recent years, reflecting the strong invasiveness and metastasis characteristics of this cancer. BC is a complex disease that involves a sequence of genetic, epigenetic, and phenotypic changes. Polymorphisms of genes involved in multiple biological pathways have been identified as potential risks of BC. These genetic polymorphisms further lead to differences in disease susceptibility and severity among individuals. The development of accurate molecular diagnoses and biological indicators of prognosis are crucial for individualized and precise treatment of BC patients.

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Sherman, Amir, Rebecca Grumet, Ron Ophir, Nurit Katzir et Yiqun Weng. Whole genome approach for genetic analysis in cucumber : Fruit size as a test case. United States Department of Agriculture, décembre 2013. http://dx.doi.org/10.32747/2013.7594399.bard.

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The Cucurbitaceae family includes a broad array of economically and nutritionally important crop species that are consumed as vegetables, staple starches and desserts. Fruit of these species, and types within species, exhibit extensive diversity as evidenced by variation in size, shape, color, flavor, and others. Fruit size and shape are critical quality determinants that delineate uses and market classes and are key traits under selection in breeding programs. However, the underlying genetic bases for variation in fruit size remain to be determined. A few species the Cucurbitaceae family were sequenced during the time of this project (cucumber was already sequenced when the project started watermelon and melon sequence became available during the project) but functional genomic tools are still missing. This research program had three major goals: 1. Develop whole genome cucumber and melon SNP arrays. 2. Develop and characterize cucumber populations segregating for fruit size. 3. Combine genomic tools, segregating populations, and phenotypic characterization to identify loci associated with fruit size. As suggested by the reviewers the work concentrated mostly in cucumber and not both in cucumber and melon. In order to develop a SNP (single nucleotide polymorphism) array for cucumber, available and newly generated sequence from two cucumber cultivars with extreme differences in shape and size, pickling GY14 and Chinese long 9930, were analyzed for variation (SNPs). A large set of high quality SNPs was discovered between the two parents of the RILs population (GY14 and 9930) and used to design a custom SNP array with 35000 SNPs using Agilent technology. The array was validated using 9930, Gy14 and F1 progeny of the two parents. Several mapping populations were developed for linkage mapping of quantitative trait loci (QTL) for fruit size These includes 145 F3 families and 150 recombinant inbred line (RILs F7 or F8 (Gy14 X 9930) and third population contained 450 F2 plants from a cross between Gy14 and a wild plant from India. The main population that was used in this study is the RILs population of Gy14 X 9930. Phenotypic and morphological analyses of 9930, Gy14, and their segregating F2 and RIL progeny indicated that several, likely independent, factors influence cucumber fruit size and shape, including factors that act both pre-anthesis and post-pollination. These include: amount, rate, duration, and plane of cell division pre- and post-anthesis and orientation of cell expansion. Analysis of F2 and RIL progeny indicated that factors influencing fruit length were largely determined pre-anthesis, while fruit diameter was more strongly influenced by environment and growth factors post-anthesis. These results suggest involvement of multiple genetically segregating factors expected to map independently onto the cucumber genome. Using the SNP array and the phenotypic data two major QTLs for fruit size of cucumber were mapped in very high accuracy (around 300 Kb) with large set of markers that should facilitate identification and cloning of major genes that contribute to fruit size in cucumber. In addition, a highly accurate haplotype map of all RILS was created to allow fine mapping of other traits segregating in this population. A detailed cucumber genetic map with 6000 markers was also established (currently the most detailed genetic map of cucumber). The integration of genetics physiology and genomic approaches in this project yielded new major infrastructure tools that can be used for understanding fruit size and many other traits of importance in cucumber. The SNP array and genetic population with an ultra-fine map can be used for future breeding efforts, high resolution mapping and cloning of traits of interest that segregate in this population. The genetic map that was developed can be used for other breeding efforts in other populations. The study of fruit development that was done during this project will be important in dissecting function of genes that that contribute to the fruit size QTLs. The SNP array can be used as tool for mapping different traits in cucumber. The development of the tools and knowledge will thus promote genetic improvement of cucumber and related cucurbits.

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Joel, Daniel M., Steven J. Knapp et Yaakov Tadmor. Genomic Approaches for Understanding Virulence and Resistance in the Sunflower-Orobanche Host-Parasite Interaction. United States Department of Agriculture, août 2011. http://dx.doi.org/10.32747/2011.7592655.bard.

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Oroginal Objectives: (i) identify DNA markers linked to the avirulence (Avr) locus and locate the Avr locus through genetic mapping with an inter-race Orobanche cumana population; (ii) develop high-throughput fingerprint DNA markers for genotypingO. cumana races; (iii) identify nucleotide binding domain leucine rich repeat (NB-LRR) genes encoding R proteins conferring resistance to O. cumana in sunflower; (iv) increase the resolution of the chromosomal segment harboring Or₅ and related R genes through genetic and physical mapping in previously and newly developed mapping populations of sunflower; and (v) develop high-throughput DNA markers for rapidly and efficiently identifying and transferring sunflower R genes through marker-assisted selection. Revisions made during the course of project: Following changes in O. cumana race distribution in Israel, the newly arrived virulent race H was chosen for further analysis. HA412-HO, which was primarily chosen as a susceptible sunflower cultivar, was more resistant to the new parasite populations than var. Shemesh, thus we shifted sunflower research into analyzing the resistance of HA412-HO. We exceeded the deliverables for Objectives #3-5 by securing funding for complete physical and high-density genetic mapping of the sunflower genome, in addition to producing a complete draft sequence of the sunflower genome. We discovered limited diversity between the parents of the O. cumana population developed for the mapping study. Hence, the developed DNA marker resources were insufficient to support genetic map construction. This objective was beyond the scale and scope of the funding. This objective is challenging enough to be the entire focus of follow up studies. Background to the topic: O. cumana, an obligate parasitic weed, is one of the most economically important and damaging diseases of sunflower, causes significant yield losses in susceptible genotypes, and threatens production in Israel and many other countries. Breeding for resistance has been crucial for protecting sunflower from O. cumana, and problematic because new races of the pathogen continually emerge, necessitating discovery and deployment of new R genes. The process is challenging because of the uncertainty in identifying races in a genetically diverse parasite. Major conclusions, solutions, achievements: We developed a small collection of SSR markers for genetic mapping in O. cumana and completed a diversity study to lay the ground for objective #1. Because DNA sequencing and SNPgenotyping technology dramatically advanced during the course of the study, we recommend shifting future work to SNP discovery and mapping using array-based approaches, instead of SSR markers. We completed a pilot study using a 96-SNP array, but it was not large enough to support genetic mapping in O.cumana. The development of further SNPs was beyond the scope of the grant. However, the collection of SSR markers was ideal for genetic diversity analysis, which indicated that O. cumanapopulations in Israel considerably differ frompopulations in other Mediterranean countries. We supplied physical and genetic mapping resources for identifying R-genes in sunflower responsible for resistance to O. cumana. Several thousand mapped SNP markers and a complete draft of the sunflower genome sequence are powerful tools for identifying additional candidate genes and understanding the genomic architecture of O. cumana-resistanceanddisease-resistance genes. Implications: The OrobancheSSR markers have utility in sunflower breeding and genetics programs, as well as a tool for understanding the heterogeneity of races in the field and for geographically mapping of pathotypes.The segregating populations of both Orobanche and sunflower hybrids are now available for QTL analyses.

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Bennett, Alan B., Arthur A. Schaffer, Ilan Levin, Marina Petreikov et Adi Doron-Faigenboim. Manipulating fruit chloroplasts as a strategy to improve fruit quality. United States Department of Agriculture, janvier 2013. http://dx.doi.org/10.32747/2013.7598148.bard.

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The Original Objectives were modified and two were eliminated to reflect the experimental results: Objective 1 - Identify additional genetic variability in SlGLK2 and IPin wild, traditional and heirloom tomato varieties Objective 2 - Determine carbon balance and horticultural characteristics of isogenic lines expressing functional and non-functional alleles of GLKsand IP Background: The goal of the research was to understand the unique aspects of chloroplasts and photosynthesis in green fruit and the consequences of increasing the chloroplast capacity of green fruit for ripe fruit sugars, yield, flavor and nutrient qualities. By focusing on the regulation of chloroplast formation and development solely in fruit, our integrated knowledge of photosynthetic structures/organs could be broadened and the results of the work could impact the design of manipulations to optimize quality outputs for the agricultural fruit with enhanced sugars, nutrients and flavors. The project was based on the hypothesis that photosynthetic and non-photosynthetic plastid metabolism in green tomato fruit is controlled at a basal level by light for minimal energy requirements but fruit-specific genes regulate further development of robust chloroplasts in this organ. Our BARD project goals were to characterize and quantitate the photosynthesis and chloroplast derived products impacted by expression of a tomato Golden 2- like 2 transcription factor (US activities) in a diverse set of 31 heirloom tomato lines and examine the role of another potential regulator, the product of the Intense Pigment gene (IP activities). Using tomato Golden 2-like 2 and Intense Pigment, which was an undefined locus that leads to enhanced chloroplast development in green fruit, we sought to determine the benefits and costs of extensive chloroplast development in fruit prior to ripening. Major conclusions, solutions, achievements: Single nucleotide polymorphisms in the promoter, coding and intronicSlGLK2 sequences of 20 heirloom tomato lines were identified and three SlGLK2 promoter lineages were identified; two lineages also had striped fruit variants. Lines with striped fruit but no shoulders were not identified. Green fruit chlorophyll and ripe fruit soluble sugar levels were measured in 31 heirloom varieties and fruit size correlates with ripe fruit sugars but dark shoulders does not. A combination of fine mapping, recombinant generation, RNAseq expression and SNP calling all indicated that the proposed localization of a single locus IP on chr 10 was incorrect. Rather, the IP line harbored 11 separate introgressions from the S. chmielewskiparent, scattered throughout the genome. These introgressions harbored ~3% of the wild species genome and no recombinant consistently recovered the IP parental phenotype. The 11 introgressions were dissected into small combinations in segregating recombinant populations. Based on these analyses two QTL for Brix content were identified, accounting for the effect of increased Brix in the IP line. Scientific and agricultural implications: SlGLK2 sequence variation in heirloom tomato varieties has been identified and can be used to breed for differences in SlGLK2 expression and possibly in the green striped fruit phenotype. Two QTL for Brix content have been identified in the S. chmielewskiparental line and these can be used for increasing soluble solids contents in breeding programs.

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Breiman, Adina, Jan Dvorak, Abraham Korol et Eduard Akhunov. Population Genomics and Association Mapping of Disease Resistance Genes in Israeli Populations of Wild Relatives of Wheat, Triticum dicoccoides and Aegilops speltoides. United States Department of Agriculture, décembre 2011. http://dx.doi.org/10.32747/2011.7697121.bard.

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Wheat is the most widely grown crop on earth, together with rice it is second to maize in total global tonnage. One of the emerging threats to wheat is stripe (yellow) rust, especially in North Africa, West and Central Asia and North America. The most efficient way to control plant diseases is to introduce disease resistant genes. However, the pathogens can overcome rapidly the effectiveness of these genes when they are wildly used. Therefore, there is a constant need to find new resistance genes to replace the non-effective genes. The resistance gene pool in the cultivated wheat is depleted and there is a need to find new genes in the wild relative of wheat. Wild emmer (Triticum dicoccoides) the progenitor of the cultivated wheat can serve as valuable gene pool for breeding for disease resistance. Transferring of novel genes into elite cultivars is highly facilitated by the availability of information of their chromosomal location. Therefore, our goals in this study was to find stripe rust resistant and susceptible genotypes in Israeli T. dicoccoides population, genotype them using state of the art genotyping methods and to find association between genetic markers and stripe rust resistance. We have screened 129 accessions from our collection of wild emmer wheat for resistance to three isolates of stripe rust. About 30% of the accessions were resistant to one or more isolates, 50% susceptible, and the rest displayed intermediate response. The accessions were genotyped with Illumina'sInfinium assay which consists of 9K single nucleotide polymorphism (SNP) markers. About 13% (1179) of the SNPs were polymorphic in the wild emmer population. Cluster analysis based on SNP diversity has shown that there are two main groups in the wild population. A big cluster probably belongs to the Horanum ssp. and a small cluster of the Judaicum ssp. In order to avoid population structure bias, the Judaicum spp. was removed from the association analysis. In the remaining group of genotypes, linkage disequilibrium (LD) measured along the chromosomes decayed rapidly within one centimorgan. This is the first time when such analysis is conducted on a genome wide level in wild emmer. Such a rapid decay in LD level, quite unexpected for a selfer, was not observed in cultivated wheat collection. It indicates that wild emmer populations are highly suitable for association studies yielding a better resolution than association studies in cultivated wheat or genetic mapping in bi-parental populations. Significant association was found between an SNP marker located in the distal region of chromosome arm 1BL and resistance to one of the isolates. This region is not known in the literature to bear a stripe rust resistance gene. Therefore, there may be a new stripe rust resistance gene in this locus. With the current fast increase of wheat genome sequence data, genome wide association analysis becomes a feasible task and efficient strategy for searching novel genes in wild emmer wheat. In this study, we have shown that the wild emmer gene pool is a valuable source for new stripe rust resistance genes that can protect the cultivated wheat.

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Levisohn, Sharon, Maricarmen Garcia, David Yogev et Stanley Kleven. Targeted Molecular Typing of Pathogenic Avian Mycoplasmas. United States Department of Agriculture, janvier 2006. http://dx.doi.org/10.32747/2006.7695853.bard.

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Intraspecies identification (DNA "fingerprinting") of pathogenic avian mycoplasmas is a powerful tool for epidemiological studies and monitoring strain identity. However the only widely method available for Mycoplasma gallisepticum (MG) and M. synoviae (MS)wasrandom amplified polymorphic DNA (RAPD). This project aimed to develop alternative and supplementary typing methods that will overcome the major constraints of RAPD, such as the need for isolation of the organism in pure culture and the lack of reproducibility intrinsic in the method. Our strategy focussed on recognition of molecular markers enabling identification of MG and MS vaccine strains and, by extension, pathogenic potential of field isolates. Our first aim was to develop PCR-based systems which will allow amplification of specific targeted genes directly from clinical material. For this purpose we evaluated the degree of intraspecies heterogeneity in genes encoding variable surface antigens uniquely found in MG all of which are putative pathogenicity factors. Phylogenic analysis of targeted sequences of selected genes (pvpA, gapA, mgc2, and lp) was employed to determine the relationship among MG strains.. This method, designated gene targeted sequencing (GTS), was successfully employed to identify strains and to establish epidemiologically-linked strain clusters. Diagnostic PCR tests were designed and validated for each of the target genes, allowing amplification of specific nucleotide sequences from clinical samples. An mgc2-PCR-RFLP test was designed for rapid differential diagnosis of MG vaccine strains in Israel. Addressing other project goals, we used transposon mutagenesis and in vivo and in vitro models for pathogenicity to correlated specific changes in target genes with biological properties that may impact the course of infection. An innovative method for specific detection and typing of MS strains was based on the hemagglutinin-encoding gene vlhA, uniquely found in this species. In parallel, we evaluated the application of amplified fragment length polymorphism (AFLP) in avian mycoplasmas. AFLP is a highly discriminatory method that scans the entire genome using infrequent restriction site PCR. As a first step the method was found to be highly correlated with other DNA typing methods for MG species and strain differentiation. The method is highly reproducible and relatively rapid, although it is necessary to isolate the strain to be tested. Both AFLP and GTS are readily to amenable to computer-assisted analysis of similarity and construction of a data-base resource. The availability of improved and diverse tools will help realize the full potential of molecular typing of avian mycoplasmas as an integral and essential part of mycoplasma control programs.

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Funkenstein, Bruria, et Cunming Duan. GH-IGF Axis in Sparus aurata : Possible Applications to Genetic Selection. United States Department of Agriculture, novembre 2000. http://dx.doi.org/10.32747/2000.7580665.bard.

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Many factors affect growth rate in fish: environmental, nutritional, genetics and endogenous (physiological) factors. Endogenous control of growth is very complex and many hormone systems are involved. Nevertheless, it is well accepted that growth hormone (GH) plays a major role in stimulating somatic growth. Although it is now clear that most, if not all, components of the GH-IGF axis exist in fish, we are still far from understanding how fish grow. In our project we used as the experimental system a marine fish, the gilthead sea bream (Sparus aurata), which inhabits lagoons along the Mediterranean and Atlantic coasts of Europe, and represents one of the most important fish species used in the mariculture industry in the Mediterranean region, including Israel. Production of Sparus is rapidly growing, however, in order for this production to stay competitive, the farming of this fish species has to intensify and become more efficient. One drawback, still, in Sparus extensive culture is that it grows relatively slow. In addition, it is now clear that growth and reproduction are physiological interrelated processes that affect each other. In particular sexual maturation (puberty) is known to be closely related to growth rate in fish as it is in mammals, indicating interactions between the somatotropic and gonadotropic axes. The goal of our project was to try to identify the rate-limiting components(s) in Sparus aurata GH-IGF system which might explain its slow growth by studying the ontogeny of growth-related genes: GH, GH receptor, IGF-I, IGF-II, IGF receptor, IGF-binding proteins (IGFBPs) and Pit-1 during early stages of development of Sparus aurata larvae from slow and fast growing lines. Our project was a continuation of a previous BARD project and could be divided into five major parts: i) obtaining additional tools to those obtained in the previous project that are necessary to carry out the developmental study; ii) the developmental expression of growth-related genes and their cellular localization; iii) tissue-specific expression and effect of GH on expression of growth-related genes; iv) possible relationship between GH gene structure, growth rate and genetic selection; v) the possible role of the IGF system in gonadal development. The major findings of our research can be summarized as follows: 1) The cDNAs (complete or partial) coding for Sparus IGFBP-2, GH receptor and Pit-1 were cloned. Sequence comparison reveals that the primary structure of IGFBP-2 protein is 43-49% identical to that of zebrafish and other vertebrates. Intensive efforts resulted in cloning a fragment of 138 nucleotides, coding for 46 amino acids in the proximal end of the intracellular domain of GH receptor. This is the first fish GH receptor cDNA that had been cloned to date. The cloned fragment will enable us to complete the GH - receptor cloning. 2) IGF-I, IGF-II, IGFBP-2, and IGF receptor transcripts were detected by RT-PCR method throughout development in unfertilized eggs, embryos, and larvae suggesting that these mRNAs are products of both the maternal and the embryonic genomes. Preliminary RT-PCR analysis suggest that GH receptor transcript is present in post-hatching larvae already on day 1. 3) IGF-1R transcripts were detected in all tissues tested by RT-PCR with highest levels in gill cartilage, skin, kidney, heart, pyloric caeca, and brain. Northern blot analysis detected IGF receptor only in gonads, brain and gill cartilage but not in muscle; GH increased slightly brain and gill cartilage IGF-1R mRNA levels. 4) IGFBP-2 transcript were detected only in liver and gonads, when analyzed by Northern blots; RT-PCR analysis revealed expression in all tissues studied, with the highest levels found in liver, skin, gonad and pyloric caeca. 5) Expression of IGF-I, IGF-II, IGF-1R and IGFBP-2 was analyzed during gonadal development. High levels of IGF-I and IGFBP-2 expression were found in bisexual young gonads, which decreased during gonadal development. Regardless of maturational stage, IGF-II levels were higher than those of IGF-L 6) The GH gene was cloned and its structure was characterized. It contains minisatellites of tandem repeats in the first and third introns that result in high level of genetic polymorphism. 7) Analysis of the presence of IGF-I and two types of IGF receptor by immunohistochemistry revealed tissue- and stage-specific expression during larval development. Immunohistochemistry also showed that IGF-I and its receptors are present in both testicular and ovarian cells. Although at this stage we are not able to pinpoint which is the rate-limiting step causing the slow growth of Sparus aurata, our project (together with the previous BARD) yielded a great number of experimental tools both DNA probes and antibodies that will enable further studies on the factors regulating growth in Sparus aurata. Our expression studies and cellular localization shed new light on the tissue and developmental expression of growth-related genes in fish.

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