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Journal articles on the topic 'Polymorphic variation'

Author: Grafiati

Published: 4 June 2021

Last updated: 17 February 2022

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1

Lakshmi, M., M. Parani, Nivedita Ram, and Ajay Parida. "Molecular phylogeny of mangroves VI. Intraspecific genetic variation in mangrove species Excoecaria agallocha L. (Euphorbiaceae)." Genome 43, no. 1 (2000): 110–15. http://dx.doi.org/10.1139/g99-109.

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Genomic DNA from 84 individuals of Excoecaria agallocha from seven mangrove populations were analysed for random amplified polymorphic DNAs (RAPDs) using 16 random 10-mer primers. Polymorphism within populations varied from 20% to 31%. At the interpopulation level, 111/149 (74%) of RAPDs were polymorphic. Restriction fragment length polymorphism (RFLP) analysis of 21 individuals (3 individuals randomly selected from the 7 populations) using 30 probe-enzyme combinations revealed a high level of interpopulation polymorphism (62.2%) indicating interpopulation genetic divergence. The polymorphic R

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Kole, Dr Pravas Ranjan, K. V. Bhat, Rekha Chaudhury, S. K. Malik, and G. Rajeshwar Rao. "Genetic Diversity Analysis in wild species of Pongamia pinnata (L.) using RAPD and SRAP markers." JOURNAL OF ADVANCES IN BIOTECHNOLOGY 4, no. 3 (2014): 442–52. http://dx.doi.org/10.24297/jbt.v4i3.4996.

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Bio -diversityrefers to the variations within the living world while genetic diversity is the sum of genetic characteristics within any species or genus. Genetic diversity serves as a way for populations to adapt to changing environments. With more variation, it is more likely that some individuals in a population will possess variations of alleles that are suited for the environment. Those individuals are more likely to survive to produce offspring bearing that allele. The population will continue for more generations because of the success of these individuals. The extensive literature surve

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Nagl, Nevena, Ksenija Taski-Ajdukovic, Andrea Popovic, Zivko Curcic, Dario Danojevic, and Lazar Kovacev. "Estimation of genetic variation among related sugar beet genotypes by using RAPD." Genetika 43, no. 3 (2011): 575–82. http://dx.doi.org/10.2298/gensr1103575n.

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In marker assisted breeding programs, determination of genome polymorphism and development of suitable molecular markers is of the greatest importance. The aim of this research was development of RAPD markers, which will enable quick and cost efficient DNA polymorphism analysis among closely related sugar beet genotypes. The research was conducted on twelve sugar beet genotypes from population of closely related genotypes. Reactions with eight RAPD primers and five primer mixtures resulted in stable and reproducible bands in all samples, with 44 polymorphic and 14 monomorphic loci, and average

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4

Poncet, V., P. Hamon, J. Minier, C. Carasco, S. Hamon, and M. Noirot. "SSR cross-amplification and variation within coffee trees (Coffea spp.)." Genome 47, no. 6 (2004): 1071–81. http://dx.doi.org/10.1139/g04-064.

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Primer sets were developed from 85 Coffea arabica sequences in addition to 25 already published primer sets. They were subsequently used for amplification in six African Coffea species: Coffea canephora (CAN), Coffea eugenioides (EUG), Coffea heterocalyx (HET), Coffea liberica (LIB), Coffea sp. Moloundou (MOL) and Coffea pseudozanguebariae (PSE). The amplification percentages for these 110 primer pairs ranged from 72.7% for LIB to 86.4% for PSE. Good transferability was thus obtained within the Coffea genus. When focusing on the two species CAN and PSE, high genetic diversity, high polymorphic

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Lu, Li, Kirk W. Pomper, Jeremiah D. Lowe, and Sheri B. Crabtree. "Genetic Variation in Pawpaw Cultivars Using Microsatellite Analysis." Journal of the American Society for Horticultural Science 136, no. 6 (2011): 415–21. http://dx.doi.org/10.21273/jashs.136.6.415.

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Pawpaw (Asimina triloba) is a tree fruit native to eastern North America, which is in the early stages of domestication. Most early 20th century pawpaw cultivars have been lost; however, recent cultivar releases and potential new releases may have enhanced genetic diversity. The objective of this study was to compare the genetic variation exhibited among older and new pawpaw cultivars and Kentucky State University (KSU) advanced selections using simple sequence repeat (SSR) markers. Polymorphic microsatellite marker analysis was conducted with nine older pawpaw cultivars, six recently released

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Ngezahayo, Frederic, Wanli Guo, Lei Gong, Fangxia Li, Bao Liu, and Yingshan Dong. "Genomic Variation in Micropropagated Robinia ambigua `idahoensis' Revealed by RAPD Markers." HortScience 41, no. 6 (2006): 1466–68. http://dx.doi.org/10.21273/hortsci.41.6.1466.

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The authors have previously reported an efficient in vitro system for mass micropropagation of Robinia ambigua `idahoensis' (Idaho locust). Their method used enhanced branching of axillary buds from a single donor plant along with detection of somaclonal variation by the intersimple sequence repeat (ISSR) markers. Because ISSRs tend to be clustered to specific chromosomal regions in plant genomes, the extent and scope of the genomic variations and the sequences underlying the variation warranted further investigations. In this study, the authors analyzed the same set of 40 randomly selected mi

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7

Naumova, A., and S. Croteau. "Mechanisms of Epigenetic Variation: Polymorphic Imprinting." Current Genomics 5, no. 5 (2004): 417–29. http://dx.doi.org/10.2174/1389202043349183.

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8

Cheung, Vivian G., Joshua T. Burdick, Deborah Hirschmann, and Michael Morley. "Polymorphic Variation in Human Meiotic Recombination." American Journal of Human Genetics 80, no. 3 (2007): 526–30. http://dx.doi.org/10.1086/512131.

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9

Hua, Zhihua, and Zhenyu Gao. "Adaptive and degenerative evolution of the S-Phase Kinase-Associated Protein 1-Like family in Arabidopsis thaliana." PeerJ 7 (April 12, 2019): e6740. http://dx.doi.org/10.7717/peerj.6740.

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Genome sequencing has uncovered tremendous sequence variation within and between species. In plants, in addition to large variations in genome size, a great deal of sequence polymorphism is also evident in several large multi-gene families, including those involved in the ubiquitin-26S proteasome protein degradation system. However, the biological function of this sequence variation is yet not clear. In this work, we explicitly demonstrated a single origin of retroposed Arabidopsis Skp1-Like (ASK) genes using an improved phylogenetic analysis. Taking advantage of the 1,001 genomes project, we

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10

GEORGES, M., A. CLOP, F. MARCQ, et al. "Polymorphic Polymorphic MicroRNA-Target Interactions: A Novel Source of Phenotypic Variation." Cold Spring Harbor Symposia on Quantitative Biology 71 (January 1, 2006): 343–50. http://dx.doi.org/10.1101/sqb.2006.71.056.

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11

Zhang, Dapeng, and Wanda W. Collins. "Inter- and Intraspecific RAPD Variation in Four Ipomoea Species." HortScience 30, no. 4 (1995): 773A—773. http://dx.doi.org/10.21273/hortsci.30.4.773a.

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Randomly amplified polymorphic DNA (RAPD) analysis was performed on 18 accessions belonging to four different species of the genus Ipomoea, including sweetpotato and three related species. Twenty-two out of 30 primers tested revealed polymorphisms among these four species. Eight primers were selected on the basis of the number and repeatability of polymorphism produced. With these, a total of 98 different DNA bands were obtained and 85% of them were polymorphic. Based on the presence/absence of the bands, a genetic similarity among accessions and among species was calculated. Unweighted pair-g

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12

González, Juan Manuel, and Esther Ferrer. "Random amplified polymorphic DNA analysis in Hordeum species." Genome 36, no. 6 (1993): 1029–31. http://dx.doi.org/10.1139/g93-137.

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Random amplified polymorphic DNA analysis was performed by applying a set of 13 arbitrary 10-mer primers to 19 Hordeum species and subspecies. High levels of variation in fragment pattern were observed both within and among species with most of the primers used. Genetic similarities between accessions and species were calculated from the fragment patterns. The resulting phenograms confirmed previous relationships among the Hordeum species.Key words: random amplified polymorphic DNA, polymerase chain reaction, polymorphism, Hordeum.

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13

Guasmi, Ferdaous, Walid Elfalleh, Hédia Hannachi, et al. "The Use of ISSR and RAPD Markers for Genetic Diversity among South Tunisian Barley." ISRN Agronomy 2012 (January 3, 2012): 1–10. http://dx.doi.org/10.5402/2012/952196.

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Random amplified polymorphic DNA (RAPD) and intersimple sequence repeat (ISSR) were assayed to determine the genetic diversity of 80 barley specimens from South Tunisia. The ISSR primers showed variation in the percentage of polymorphism, band informativeness (Ib), and resolving power (Rp). The percentage of polymorphism is 66.67%, the average Ib ranged from 0.24 to 0.39, while Rp ranged from 0.74 to 1.16. In RAPD analysis, three primers yielded a total of 17 scorable bands, which are all polymorphic. The three polymorphic primers exhibited variation with regard to average band informativeness

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Haque, MS, T. Biswas, MS Islam, and MS Hossain. "In vitro regeneration and PCR-RAPD based detection of somaclonal variation in kenaf (Hibiscus cannabinus)." Progressive Agriculture 28, no. 2 (2017): 100–108. http://dx.doi.org/10.3329/pa.v28i2.33470.

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Though direct systems of regeneration through culture of organized meristems usually produce true-to-type plants, variations in the progenies have widely been reported. Fiber producing kenaf plants (Hibiscus cannabinus L.) were regenerated from petiole, hypocotyls and cotyledonous petiole explants on MS medium containing BAP (benzyl amino purine) and NAA (?-napthaleneacetic acid) followed by assessment of regenerants by RAPD markers to detect somaclonal variation among them. Genomic DNA from twenty seven plants [three mother plants and two clones (clone 1 and 2) from each mother plant with thr

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15

Hatsumi, Machiko. "Karyotype polymorphism in Drosophila albomicans." Genome 29, no. 3 (1987): 395–400. http://dx.doi.org/10.1139/g87-069.

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Supernumerary (B) chromosomes are present in Thai, Malay, and Burmese populations of Drosophila albomicans (2n = 6) in a polymorphic state. Although usually stable at mitosis, their numbers differed between individuals and their frequency was also different between isofemale lines and between populations. Arm 3 of the X3 chromosome was polymorphic for the presence and the size of a procentric heterochromatic segment. Chromosome 4 is polytypic for variation in length governed by differences in the amount of heterochromatin and the long variant is polymorphic for the location of its secondary co

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16

Arulsekar, S., and F. A. Bliss. "RANDOM AMPLIFIED POLYMORPHIC DNA VARIATION IN THE CULTIVATED SPECIES OF PRUNUS." HortScience 27, no. 6 (1992): 574a—574. http://dx.doi.org/10.21273/hortsci.27.6.574a.

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Studies of genetic variation at the DNA level in the tree fruit and nut crop species of Prunus have been very limited. Recently molecular markers based on random amplified polymorphic DNA (RAPD) markers have been shown to be highly useful and efficient gene markers in other plant and animal species. We have used a total of 50 primers (10-mers) with arbitrary nucleotide sequence to identify cultivars of cherry, plum, apricot, peach and almond. A total of 120 accessions of different cultivars were assayed. The variation revealed by RAPD markers was highly species specific in the five Prunus spec

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17

Hammer, M. F., A. B. Spurdle, T. Karafet, et al. "The Geographic Distribution of Human Y Chromosome Variation." Genetics 145, no. 3 (1997): 787–805. http://dx.doi.org/10.1093/genetics/145.3.787.

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We examined variation on the nonrecombining portion of the human Y chromosome to investigate human evolution during the last 200,000 years. The Y-specific polymorphic sites included the Y Alu insertional polymorphism or “YAP” element (DYS287), the poly(A) tail associated with the YAP element, three point mutations in close association with the YAP insertion site, an A-G polymorphic transition (DYS271), and a tetranucleotide microsatellite (DYS19). Global variation at the five bi-allelic sites (DYS271, DYS287, and the three point mutations) gave rise to five “YAP haplotypes” in 60 populations f

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18

Newbury, H. J., E. C. Howell, Jonathan H. Crouch, and B. V. Ford-Lloyd. "Natural and culture-induced genetic variation in plantains (Musa spp. AAB group)." Australian Journal of Botany 48, no. 4 (2000): 493. http://dx.doi.org/10.1071/bt98094.

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Random amplified polymorphic DNA (RAPD) analysis of 15, mostly African, plantain land races revealed a very low proportion of polymorphic bands (13 of 276). However, further examination of these 13 marker bands demonstrated that they varied within land races and could not be used to distinguish between land races. In many cases, this could be directly associated with tissue culture treatment of the material. In order to investigate tissue culture effects in more detail, a single meristem of the West African plantain Agbagba was introduced into axenic culture and subjected to three cycles of mi

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19

Hean, Duane, Andreas Lemmerer, and Joseph Michael. "Rampant Polymorphism in Pharmaceuticals: An Isoniazid Derivative." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C653. http://dx.doi.org/10.1107/s2053273314093462.

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Investigations into the polymorphic forms of Active Pharmaceutical Ingredients (APIs) are of vital importance to drug formulations and are often kept a closely guarded secret by pharmaceutical companies. This secrecy is maintained as the nature of the polymorph could either make or break a drug formulation. Polymorphism is the ability of a solid crystalline form to exist in more than one structural arrangement. The variation in the crystalline forms often displays different mechanical, thermal, and chemical properties. These changes can remarkably influence the bioavailability, hygroscopicity,

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20

VILAS, R., E. PANIAGUA, and M. L. SANMARTÍN. "Genetic variation within and among infrapopulations of the marine digenetic trematode Lecithochirium fusiforme." Parasitology 126, no. 5 (2003): 465–72. http://dx.doi.org/10.1017/s0031182003003081.

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Allozyme markers were used to study genetic variation in Lecithochirium fusiforme within a natural population of Conger conger. Six of 16 enzyme-coding loci studied were found to be polymorphic. These loci were surveyed in 12 infrapopulations of adult flukes. High levels of genetic variation were detected (P=0·375); Ho=0·048; He=0·085). However, the population did not conform to Hardy-Weinberg expectations, as it showed a significant deficit of heterozygotes. L. fusiforme also exhibited low differentiation between infrapopulations (FST=0·064). Despite significant linkage disequilibrium at Pgm-

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21

Varnavskaya, Nataly V., Chris C. Wood, and Rebecca J. Everett. "Genetic Variation in Sockeye Salmon (Oncorhynchus nerka) Populations of Asia and North America." Canadian Journal of Fisheries and Aquatic Sciences 51, S1 (1994): 132–46. http://dx.doi.org/10.1139/f94-300.

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We investigated population structure in sockeye salmon, Oncorhynchus nerka, in relation to ecological characteristics and geographical distribution using allozyme allelic frequencies compiled from new and previously published analyses for 71 populations (300 collections) throughout the species' range. Up to 87 protein-coding loci were screened in some samples, but of these, 55% were monomorphic, and another 31% were only slightly polymorphic with variant allele frequencies <0.01. Only 8 loci were moderately or highly polymorphic with variant allele frequencies exceeding 0.10 in at least som

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22

Hoshizaki, Sugihiko. "Detection of isozyme polymorphism and estimation of geographic variation in the brown planthopper, Nilaparvata lugens (Homoptera: Delphacidae)." Bulletin of Entomological Research 84, no. 4 (1994): 503–8. http://dx.doi.org/10.1017/s0007485300032739.

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AbstractIsozyme polymorphism in the brown planthopper, Nilaparvata lugens (Stål) was investigated using isoelectric focusing. Four of the 18 enzyme systems assayed were polymorphic. Allelic designations could be made for two enzyme systems (PGM and AK), but not for GPI and IDH, and GPI seemed to be sex-linked. Using the two highly polymorphic enzyme systems, GPI and PGM, geographic variation was estimated among several Asian (except Japanese) laboratory populations and several Japanese wild populations. Significant variation was observed among the Asian (except Japanese) populations, but the g

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23

Parani, M., M. Lakshmi, S. Elango, Nivedita Ram, C. S. Anuratha, and Ajay Parida. "Molecular phylogeny of mangroves II. Intra -and inter-specific variation in Avicennia revealed by RAPD and RFLP markers." Genome 40, no. 4 (1997): 487–95. http://dx.doi.org/10.1139/g97-065.

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Random amplified polymorphic DNA (RAPD) and restriction fragment length polymorphism (RFLP) markers were used to estimate intra- and inter-specific variation in three species of an exclusive mangrove genus, Avicennia. Intrapopulation polymorphism among the 10 populations of Avicennia marina, as measured by percentage of polymorphic RAPDs, varied between 17.8 and 38.9%, with a standard deviation of 7.28, and the coefficient of variation was 26.5%. Polymorphism in Avicennia officinalis (Pichavaram population, 32.3%) and Avicennia alba (Coringa population, 37.8%) was greater than the intrapopulat

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Staes, Nicky, Chet C. Sherwood, Hani Freeman, et al. "Serotonin Receptor 1A Variation Is Associated with Anxiety and Agonistic Behavior in Chimpanzees." Molecular Biology and Evolution 36, no. 7 (2019): 1418–29. http://dx.doi.org/10.1093/molbev/msz061.

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Abstract Serotonin is a neurotransmitter that plays an important role in regulating behavior and personality in humans and other mammals. Polymorphisms in genes coding for the serotonin receptor subtype 1A (HTR1A), the serotonin transporter (SLC6A4), and the serotonin degrading enzyme monoamine oxidase A (MAOA) are associated with anxiety, impulsivity, and neurotic personality in humans. In primates, previous research has largely focused on SLC6A4 and MAOA, with few studies investigating the role of HTR1A polymorphic variation on behavior. Here, we examined variation in the coding region of HT

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Lu, Jianghua, Kaixuan Wang, Mariana Rodova, et al. "Polymorphic Variation in Cytochrome Oxidase Subunit Genes." Journal of Alzheimer's Disease 21, no. 1 (2010): 141–54. http://dx.doi.org/10.3233/jad-2010-100123.

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26

Fraser, H. B., and X. Xie. "Common polymorphic transcript variation in human disease." Genome Research 19, no. 4 (2009): 567–75. http://dx.doi.org/10.1101/gr.083477.108.

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Chanda, Ipsita. "Intra-Serotype Polyprotein Variation and its Effect on Antigenicity of Dengue Virus." Journal of Communicable Diseases 53, no. 01 (2021): 27–34. http://dx.doi.org/10.24321/0019.5138.202106.

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Dengue virus is a mosquito-borne human pathogen, causing disease that ranges from mild febrile illness to life-threatening hemorrhage fever/ shock syndrome. The altered antigenicity and virulence in the dengue virus, resulting from the accumulation and fixation of the favorable mutations in the genome, is the cause of concern nowadays. The present study focuses on the comparative study of polyproteins of viral strains within each dengue serotype to understand the trend of intra-serotype polyprotein variation and its effect on the antigenicity. Polyprotein sequences of viral strains in each ser

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Zabinski, Catherine. "Isozyme variation in eastern hemlock." Canadian Journal of Forest Research 22, no. 12 (1992): 1838–42. http://dx.doi.org/10.1139/x92-240.

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Tsugacanadensis (L.) Carr., commonly known as eastern hemlock, is a coniferous tree native to eastern North America. The western and southern edges of its geographic distribution are characterized by disjunct populations 50–100 km or more from the continuous distribution. Genetic variation was measured using starch gel electrophoresis of needle tissue enzymes from 17 populations throughout the species' distribution. Six enzyme systems including 10 putative loci were assayed, with only 1 of the 10 loci being polymorphic. The polymorphic locus, cytochrome oxidase, consisted of two alleles presen

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Long, Anthony D., Richard F. Lyman, Alison H. Morgan, Charles H. Langley, and Trudy F. C. Mackay. "Both Naturally Occurring Insertions of Transposable Elements and Intermediate Frequency Polymorphisms at the achaete-scute Complex Are Associated With Variation in Bristle Number in Drosophila melanogaster." Genetics 154, no. 3 (2000): 1255–69. http://dx.doi.org/10.1093/genetics/154.3.1255.

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Abstract A restriction enzyme survey of a 110-kb region including the achaete scute complex (ASC) examined 14 polymorphic molecular markers in a sample of 56 naturally occurring chromosomes. Large insertions as a class were associated with a reduction in both sternopleural and abdominal bristle number, supporting deleterious mutation-selection equilibrium models for the maintenance of quantitative genetic variation. Two polymorphic sites were independently associated with variation in bristle number measured in two genetic backgrounds as assessed by a permutation test. A 6-bp deletion near sc

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Li, Mu, Wanli Guo, Lanjuan Hu, et al. "Genetic variation in natural populations of Hordeum brevisubulatum native to the Songnen Prairie in northeastern China: Comparison of four nuclear DNA markers." Canadian Journal of Plant Science 87, no. 4 (2007): 773–80. http://dx.doi.org/10.4141/cjps07029.

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Hordeum brevisubulatum (Trin) Link, a perennial wild grass, shows high tolerance to salinity- and/or alkaline-eroded soil, and is an important forage grass. Nonetheless, the genetic variation within and among natural populations of this species has not been investigated. In this study, four PCR-based dominant nuclear DNA markers, i.e., amplified fragment length polymorphism (AFLP), inter-simple sequence repeat (ISSR), retrotransposon-microsatellite-amplifiedpolymorphism (REMAP), and random amplified polymor phic DNA (RAPD) were used to investigate the genetic variation of a total of 80 plants

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Viard, F., Y. A. El-Kassaby, and K. Ritland. "Diversity and genetic structure in populations of Pseudotsuga menziesii (Pinaceae) at chloroplast microsatellite loci." Genome 44, no. 3 (2001): 336–44. http://dx.doi.org/10.1139/g01-010.

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Genetic variation was compared between uniparentally-inherited (chloroplast simple sequence repeats, cpSSRs) vs. biparentally-inherited (isozyme and random amplified polymorphic DNA, RAPD) genetic markers in Douglas-fir (Pseudotsuga mensiezii) from British Columbia. Three-hundred twenty-three individuals from 11 populations were assayed. In Douglas-fir, the cpSSR primer sites were well-conserved relative to Pinus thunbergii (11 of 17 loci clearly amplified), but only 3 loci were appreciably polymorphic. At these cpSSR loci, we found an unexpectedly low level of polymorphism within populations,

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Aadil, Wani, Rajinder Kaur, Bashir Ahmad Ganai, et al. "Variation at Interleukin-10 Locus Represents Susceptibility to Psoriasis in North Indian Population." Endocrine, Metabolic & Immune Disorders - Drug Targets 19, no. 1 (2019): 53–58. http://dx.doi.org/10.2174/1871530318666180821161629.

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Background: IL-10 is an important pleiotropic, immunoregulatory and anti-inflammatory cytokine which plays a significant role in the pathogenesis of psoriasis. Objective: The aim of the present study was to determine whether the three polymorphic sites of the IL-10 gene, haplotype and serum level confer susceptibility to psoriasis. Method: 200 psoriatic patients and 200 controls were genotyped for three IL-10 polymorphic sites by ARMS polymerase chain reaction. Serum levels of IL -10 were measured by ELISA. Results: Our results demonstrated that polymorphism of IL-10 -592 C/A (adjusted* OR = 9

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Cardoso, Márcio Zikán, and Luciana Lopes Ferreira de Lima. "Dissecting the nature of subtle phenotypic variation in wing colour elements of Müllerian co-mimics." Journal of Tropical Ecology 33, no. 3 (2017): 188–96. http://dx.doi.org/10.1017/s0266467417000074.

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Abstract:Polymorphism is common in nature, but few Heliconius species are polymorphic for wing colour patterns. Eastern Brazil H. erato phyllis populations are polymorphic for hindwing elements (red raylets) and studies suggest that trait distribution varies seasonally. We carried a 3-y sampling to evaluate the hypothesis that season, wing length and pollen foraging were associated with morph diversity. Individual phenotypes were scored with regards to number of red elements in the dry and in the wet seasons. Co-mimic H. melpomene nanna was also analysed. We scored 432 H. erato and 513 H. melp

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Riley, M. A., M. E. Hallas, and R. C. Lewontin. "Distinguishing the forces controlling genetic variation at the Xdh locus in Drosophila pseudoobscura." Genetics 123, no. 2 (1989): 359–69. http://dx.doi.org/10.1093/genetics/123.2.359.

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Abstract Fifty-eight isochromosomal lines sampled from two natural populations of Drosophila pseudoobscura in California and one from Bogota, Colombia, were examined using four-cutter restriction mapping. A 4.6-kb region of the xanthine dehydrogenase locus was probed and 66 of 135 restriction sites scored were polymorphic. This predicts that on average every 12th bp would be polymorphic in this region for the genes surveyed if polymorphism occurred randomly along the coding region. In addition, there were 12 insertion/deletion polymorphisms. Forty-nine distinct haplotypes were recognized in th

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Jacobs, Rachel L., Tammie S. MacFie, Amanda N. Spriggs, et al. "Novel opsin gene variation in large-bodied, diurnal lemurs." Biology Letters 13, no. 3 (2017): 20170050. http://dx.doi.org/10.1098/rsbl.2017.0050.

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Some primate populations include both trichromatic and dichromatic (red–green colour blind) individuals due to allelic variation at the X-linked opsin locus. This polymorphic trichromacy is well described in day-active New World monkeys. Less is known about colour vision in Malagasy lemurs, but, unlike New World monkeys, only some day-active lemurs are polymorphic, while others are dichromatic. The evolutionary pressures underlying these differences in lemurs are unknown, but aspects of species ecology, including variation in activity pattern, are hypothesized to play a role. Limited data on X

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Habde, Sonali, S. K. Singh, Korada Mounika, Amrutlal Khaire, D. K. Singh, and Prasanta Kumar Majhi. "STUDY OF ALLELIC VARIATION AT GENOME WIDE SSR LOCI IN PARENTS OF MAPPING POPULATION FOR HIGH GRAIN ZINC IN RICE (Oryza sativa L.)." Journal of Experimental Biology and Agricultural Sciences 8, no. 5 (2020): 558–75. http://dx.doi.org/10.18006/2020.8(5).558.575.

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Rice (Oryza sativa L.) is the source of energy and nutrition for more than half of the world’s population hence it is a crop of global significance. Breeding of mineral dense rice varieties is the main target of biofortification strategy to address micronutrient malnutrition globally. Landraces and local genotypes are proven sources of novel alleles and are a promising donor for high grain mineral. A parental polymorphism survey is a prerequisite of any QTL mapping experiment. Present study consisting of SSR markers based parental polymorphism survey at IRRI South Asia Hub ICRISAT, Hyderabad.

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Ulloa, Odeth, Fernando Ortega, and Hugo Campos. "Analysis of genetic diversity in red clover (Trifolium pratense L.) breeding populations as revealed by RAPD genetic markers." Genome 46, no. 4 (2003): 529–35. http://dx.doi.org/10.1139/g03-030.

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Red clover is an important forage legume species for temperate regions and very little is known about the genetic organization of its breeding populations. We used random amplified polymorphic DNA (RAPD) genetic markers to address the genetic diversity and the distribution of variation in 20 breeding populations and cultivars from Chile, Argentina, Uruguay, and Switzerland. Genetic distances were calculated for all possible pairwise combinations. A high level of polymorphism was found and the proportion of polymorphic loci across populations was 74.2%. A population derived from a non-certified

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TEN ASBROEK, ANNELOOR L. M. A., JEFFREY OLSEN, DAVID HOUSMAN, FRANK BAAS, and VINCE STANTON. "Genetic variation in mRNA coding sequences of highly conserved genes." Physiological Genomics 5, no. 3 (2001): 113–18. http://dx.doi.org/10.1152/physiolgenomics.2001.5.3.113.

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The frequency and distribution of genetic polymorphism in the human genome is a question of major importance. We have studied this in highly conserved genes, which encode crucial functions such as DNA replication, mRNA transcription, and translation. Evolutionary comparisons suggest that these genes are under particularly strong selective pressure, and their frequency of nucleotide sequence polymorphism would be expected to represent a minimum estimate for sequence variation throughout the genome. We have analyzed the complete coding sequence and the 3′-untranslated region (3′-UTR) of 22 human

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Lewis, Patrick A., M. Howard Tattum, Samantha Jones, et al. "Codon 129 polymorphism of the human prion protein influences the kinetics of amyloid formation." Journal of General Virology 87, no. 8 (2006): 2443–49. http://dx.doi.org/10.1099/vir.0.81630-0.

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The human prion protein (PrP) has a common polymorphism at residue 129, which can be valine or methionine. This polymorphism has a strong influence on susceptibility to prion diseases and on prion-strain properties. Previous work has shown that this amino acid variation has no measurable effect on the native structure of cellular PrP (PrPC). Here, it is shown that the polymorphism does not change the efficiency of conversion to the β-PrP conformation or affect the binding of copper(II) ions. However, in a partially denatured conformation, the polymorphic variation has a profound influence on t

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Castro, Jaime, Laura Sánchez, Paulino Martínez, Stefania De Lucchini, and Irma Nardi. "Molecular analysis of a NOR site polymorphism in brown trout (Salmo trutta): organization of rDNA intergenic spacers." Genome 40, no. 6 (1997): 916–22. http://dx.doi.org/10.1139/g97-118.

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Using restriction endonuclease mapping, we have analyzed the organization of rDNA (DNA coding for ribosomal RNA (rRNA)) units in the salmonid fish Salmo trutta, as an initial step toward understand the molecular basis of a nucleolar organizer region (NOR) site polymorphism detected in this species. The size of the rDNA units ranged between 15 and 23 kb, with remarkable variation both within individuals and between populations. Three regions of internal tandem repetitiveness responsible for this length polymorphism were located to the intergenic spacers. NOR site polymorphic individuals showed

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Glass, Elizabeth J. "Genetic variation and responses to vaccines." Animal Health Research Reviews 5, no. 2 (2004): 197–208. http://dx.doi.org/10.1079/ahr200469.

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AbstractDisease is a major source of economic loss to the livestock industry. Understanding the role of genetic factors in immune responsiveness and disease resistance should provide new approaches to the control of disease through development of safe synthetic subunit vaccines and breeding for disease resistance. The major histocompatibility complex (MHC) has been an important candidate locus for immune responsiveness studies. However, it is clear that other loci play an important role. Identifying these and quantifying the relative importance of MHC and non-MHC genes should result in new ins

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Solomon Kibite, Yong-Bi Fu,, and Ken W. Richards. "Amplified fragment length polymorphism analysis of 96 Canadian oat cultivars released between 1886 and 2001." Canadian Journal of Plant Science 84, no. 1 (2004): 23–30. http://dx.doi.org/10.4141/p02-141.

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Canadian oat breeders have developed and released more than 130 cultivars since 1886, but no systematic analyses of the genetic diversity of Canadian oat have been made. Ninety-six Canadian oat cultivars released between 1886 and 2001 were examined for genetic diversity and relationships using amplified fragment length polymorphism (AFLP) markers. Ten AFLP primer pairs were applied and over 442 polymorphic bands were generated for each cultivar. Most of the cultivars were found to be interrelated, although a few genetically distinct cultivars were also identified. The genetic variation observe

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Slip, D. J., K. Green, H. R. Burton, P. J. Mitchell, and M. Adams. "Allozyme variation in the Leopard Seal, Hydrurga leptonyx." Australian Mammalogy 17, no. 1 (1994): 1. http://dx.doi.org/10.1071/am94001.

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Blood samples collected from Leopard Seals, Hydrurga leptonyx, from Heard Island and Macquarie Island were surveyed electrophoretically for allozyme variation in blood proteins. Thirty four proteins encoded by a minimum of 39 genetic loci were surveyed; six of these were found to be polymorphic, but only one could be considered polymorphic at the 95% level of significance. The mean observed heterozygosity was 0.01 I ± 0.007, which is the lowest yet recorded for a species of Antarctic seal. Hydrurga leptonyx exhibited fixed allelic differences with the Southern Elephant Seal, Mirounga leonina,

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Lubbers, E. L., K. S. Gill, T. S. Cox, and B. S. Gill. "Variation of molecular markers among geographically diverse accessions of Triticum tauschii." Genome 34, no. 3 (1991): 354–61. http://dx.doi.org/10.1139/g91-057.

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Triticum tauschii (Coss.) Schmal. (genome DD), a diploid progenitor of hexaploid wheat (Triticum aestivum L.; AABBDD), grows across large areas of southwest Asia and contains more genetic variability for disease and insect resistance, isozymes, and seed storage proteins than the D genome of T. aestivum. To study patterns of variability at a large number of loci, we determined restriction fragment length polymorphism genotypes at 25 loci in a germ-plasm collection of 102 T. tauschii accessions. All accessions were homozygous at all loci, so "alleles" and "genotypes" were equivalent. Twenty loci

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Celis-Ramírez, Adriana Marcela, Marcela Guevara-Suarez, Juan Camilo Galvis-Marín, et al. "Genotyping of Malassezia pachydermatis disclosed genetic variation in isolates from dogs in Colombia." Pesquisa Veterinária Brasileira 39, no. 11 (2019): 915–22. http://dx.doi.org/10.1590/1678-5150-pvb-6158.

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ABSTRACT: Malassezia pachydermatis is a lipophilic and lipid-dependent yeast mostly isolated from animals’ skin; hence, it is regarded as a zoophilic species causing otitis externa in dogs. Aspects associated with its epidemiology and pathogenicity is a matter of interest. This study aimed to conduct a molecular characterization of 43 isolates of M. pachydermatis obtained from dogs with otitis externa. For this purpose, the 5.8S internal transcribed spacer 2 (ITS2) and D1/D2 26S rRNA regions were amplified, sequenced and analyzed using restriction fragment length polymorphism (RFLP) with AluI,

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Kowalski, Andrzej. "Significance of avian linker histone (H1) polymorphic variation." Journal of Biosciences 43, no. 4 (2018): 751–61. http://dx.doi.org/10.1007/s12038-018-9791-0.

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Longya, Apinya, Sucheela Talumphai, and Chatchawan Jantasuriyarat. "Morphological Characterization and Genetic Diversity of Rice Blast Fungus, Pyricularia oryzae, from Thailand Using ISSR and SRAP Markers." Journal of Fungi 6, no. 1 (2020): 38. http://dx.doi.org/10.3390/jof6010038.

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Rice blast disease is caused by the ascomycete fungus Pyricularia oryzae and is one of the most destructive rice diseases in the world. The objectives of this study were investigating various fungal morphological characteristics and performing a phylogenetic analysis. Inter-simple sequence repeat (ISSR) and sequence-related amplified polymorphism (SRAP) markers were used to examine the genetic variation of 59 rice blast fungus strains, including 57 strains collected from different fields in Thailand and two reference strains, 70-15 and Guy11. All isolates used in this study were determined to

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Lillicrap, DP, SA Taylor, PC Schuringa, et al. "Variation of the non-factor VIII sequences detected by a probe from intron 22 of the factor VIII gene." Blood 75, no. 1 (1990): 139–43. http://dx.doi.org/10.1182/blood.v75.1.139.139.

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Abstract A severe hemophilia A family has been studied with the factor VIII (F.VIII) intragenic XbaI polymorphism. During this investigation, a new variant hybridization pattern was observed with important implications concerning the non-F.VIII DNA sequences detected by the probe from intron 22, p482.6. Both Southern hybridization studies and direct analysis of amplified DNA demonstrated a variant form of the non-F.VIII sequences. This variant DNA sequence has not been responsible for any detectable phenotypic abnormalities, and likely represents a polymorphic change. In conclusion, this study

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Lillicrap, DP, SA Taylor, PC Schuringa, et al. "Variation of the non-factor VIII sequences detected by a probe from intron 22 of the factor VIII gene." Blood 75, no. 1 (1990): 139–43. http://dx.doi.org/10.1182/blood.v75.1.139.bloodjournal751139.

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A severe hemophilia A family has been studied with the factor VIII (F.VIII) intragenic XbaI polymorphism. During this investigation, a new variant hybridization pattern was observed with important implications concerning the non-F.VIII DNA sequences detected by the probe from intron 22, p482.6. Both Southern hybridization studies and direct analysis of amplified DNA demonstrated a variant form of the non-F.VIII sequences. This variant DNA sequence has not been responsible for any detectable phenotypic abnormalities, and likely represents a polymorphic change. In conclusion, this study has show

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Twedt, Daniel J., William J. Bleier, and George M. Linz. "Genetic variation in male Yellow-headed Blackbirds from the northern Great Plains." Canadian Journal of Zoology 70, no. 11 (1992): 2280–82. http://dx.doi.org/10.1139/z92-305.

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Electrophoretic differences at 15 presumptive loci were used to assess allelic frequencies, heterozygosities, and polymorphism for male Yellow-headed Blackbirds (Xanthocephalus xanthocephalus) collected in east-central Alberta, north-central North Dakota, and east-central South Dakota. Five loci were polymorphic and mean heterozygosities ranged from 0.119 to 0.133. Significant differences were detected among these geographic populations of Yellow-headed Blackbirds, primarily due to differences in the allelic frequencies of isocitrate dehydrogenase and glucose-6-phosphate dehydrogenase. Differe

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