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Dissertations / Theses on the topic 'Nuclear rDNA'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Aime, Mary Catherine. "Generic concepts in the Crepidotaceae as inferred from nuclear large subunit ribosomal DNA sequences, morphology, and basidiospore dormancy patterns." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/32285.

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The Crepidotaceae (Imai) Singer (Basidiomycetes: Agaricales) represents a proposed family of saprophytic fungi containing five agaricoid (Crepidotus, Tubaria, Melanomphalia, Simocybe, Pleurotellus) and four cyphelloid (Episphaeria, Phaeosolenia, Pellidiscus, Chromocyphella) genera. Several contemporary classification systems exist that delegate some or all of these genera to other agaric families. Phylogenetic relationships for the most prevalent genera in the Crepidotaceae were investigated using nuclear large subunit ribosomal DNA (LSU rDNA) sequences. Parsimony analysis of the molecular dat

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2

Hansen, Mario Jens. "Genotyp-Identifizierung und Wechselwirkungen an zwei Populus-Chimären." Doctoral thesis, Humboldt-Universität zu Berlin, Landwirtschaftlich-Gärtnerische Fakultät, 2005. http://dx.doi.org/10.18452/15385.

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Zwei Populus-Pfropfchimären (MA und AI), die aus P. x canadensis ‘Marilandica’ (M), P. maximowizcii x P. trichocarpa ‘Androscoggin’ (A) and P. nigra L. ’Italica’ (I) aufgebaut sind, wurden für Untersuchungen zur Laub- und Blütenblattentwicklung genutzt. In MA bildet M die äußere Lage (L1) und ihr Derivat, die Epidermis, während die inneren Lagen (L2, L3 etc.) von A gebildet werden. Bei AI stammt die L1 von A und L2, L3 etc. werden von I gebildet. Die genotypisch andersartige Epidermis bedingt bei Periklinal-Chimären morphologische Effekte wie zum Beispiel einen Fruchtknoten in einigen MA-Blüt

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3

Chemudupati, Mahesh. "Investigating the effects of nuclear envelope proteins on nuclear structure and organization in Aspergillus nidulans." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu148009978216118.

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4

Oliveira, Mariana Cabral de. "Filogenia de Porphyra spp. (Rhodophyta): sequenciamento do gene nuclear para o RNA da subunidade pequena do ribossomo (rDNA 18S) e estudos morfológicos da fase Conchocelis." Universidade de São Paulo, 1993. http://www.teses.usp.br/teses/disponiveis/41/41132/tde-09082016-164600/.

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O gênero Porphyra (Rhodophyta) apresenta uma considerável importância econômica, sendo extensivamente cultivado e consumido como alimento. O gênero é representado por mais de 70 espécies e apresenta ampla distribuição geográfica, desde regiões tropicais até polares. Sua taxonomia, baseada em poucos caracteres da fase macroscópica do seu ciclo de vida, é ainda bastante problemática. Para tentar entender melhor a taxonomia e a história evolutiva de Porphyra foram utilizadas metodologias de biologia molecular e características da fase conchocelis do ciclo de vida. Verificou-se que caracteres da f

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5

Albert, Benjamin. "Étude de l'organisation spatiale de la transcription des gènes d'ADN ribosomiques." Toulouse 3, 2011. http://thesesups.ups-tlse.fr/1630/.

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La production des ARN ribosomaux (ARNr) est une étape fondamentale dans la biogenèse des ribosomes et la croissance cellulaire. Elle représente près de 60% de l'activité transcriptionnelle. Cette activité a lieu au sein du nucléole qui est une structure dynamique variant de volume selon la croissance, et conservée dans le monde eucaryote. La production des ARNr et la formation du nucléole sont entièrement dépendantes de l'activité d'un unique complexe multiprotéique : l'ARN polymérase I (ARN pol I). Au cours de ma thèse nous avons étudié le fonctionnement de l'ARN pol I chez la levure de bière

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6

Silva, Natalia de Sousa Teixeira e. "Dinâmica nucleolar e a herança epigenética dos genes ribossomais." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/11/11137/tde-11082014-174129/.

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O nucléolo é uma organela subnuclear formada pela atividade transcricional dos genes ribossomais 18S-5.8S-26S (rDNA 45S) e consequente biogênese dos ribossomos. A atividade destes genes resulta na região organizadora do nucléolo (NOR), na forma de uma constrição secundária em cromossomos metafásicos. As constrições secundárias se condensam progressivamente durante a mitose e se descondensam ao final da telófase quando a reestruturação do nucléolo se inicia. Genomas que apresentam mais de um locus de rDNA 45S deve apresentar, obrigatoriamente, pelo menos um par de NORs, enquanto os demais loci

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7

Fuchs, Maria Cecília Perantoni. "Controle genético e epigenético da expressão heteromórfica de regiões organizadoras do nucléolo em Crotalaria retusa L. (Leguminosae-Papilionoideae)." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/11/11137/tde-14102009-083128/.

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O presente trabalho teve por objetivo compreender e analisar os mecanismos genéticos e epigenéticos da expressão diferencial de regiões organizadoras do nucléolo - RONs através do estudo de dois acessos (CRT-1 e CRT-2) de Crotalaria retusa. O acesso CRT-1 é uma cultivar, enquanto que o acesso CRT-2 é proveniente de uma população periférica da orla marítima de Ilhéus BA. Por serem temporalmente e espacialmente separados, acredita-se que os acessos foram submetidos a pressões seletivas diferentes, resultando em alterações dos padrões epigenéticos, principalmente nas RONs. Para o desenvolvimento

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8

Vendrell, Arasa Alexandre. "SCF cdc4 regulates msn2 and msn4 dependent gene expression to counteract hog1 induced lethality." Doctoral thesis, Universitat Pompeu Fabra, 2009. http://hdl.handle.net/10803/7153.

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L'activació sostinguda de Hog1 porta a una inhibició del creixement cel·lular. En aquest treball, hem observat que el fenotip de letalitat causat per l'activació sostinguda de Hog1 és parcialment inhibida per la mutació del complexe SCFCDC4. La inhibició de la mort causada per l'activació sostinguda de Hog1 depèn de la via d'extensió de la vida. Quan Hog1 s'activa de manera sostinguda, la mutació al complexe SCFCDC4 fa que augmenti l'expressió gènica depenent de Msn2 i Msn4 que condueix a una sobreexpressió del gen PNC1 i a una hiperactivació de la deacetilassa Sir2. La hiperactivació de Sir2

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9

"Phylogenetic Placement of African Cornus: Evidence of Nuclear rDNA." TopSCHOLAR, 1997. http://digitalcommons.wku.edu/stu_hon_theses/25.

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10

Yi-HuanTsou and 鄒毅寰. "To study the role of nucleolar protein MSP58 in ribosomal DNA (rDNA) transcription." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/07774920202949337834.

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碩士<br>國立成功大學<br>藥理學研究所<br>100<br>MSP58/MCRS1 has been reported to interact with several proteins, such as nucleolar protein p120, Mi-2β; transcription factors Daxx, STRA13, Nrf1, SWI/SNF chromatin remodeling subunit BRG1, and also RNA-binding protein FMR. These findings imply that MSP58 proteins are crucial for transcriptional regulation in nuclei and nucleoli. In this study, we examined the role of MSP58 in the transcriptional modulation of the ribosomal genes. Initially, we generated and characterized the polyclonal antibodies against MSP58. The main localization of MSP58 was consistent in n

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11

CAISOVÁ, Lenka. "Molecular phylogeny and taxonomic revision of chaetophoralean algae (Chlorophyta)." Doctoral thesis, 2011. http://www.nusl.cz/ntk/nusl-79954.

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Since the human inclination to estimate and trace natural diversity, usable species definitions as well as taxonomical systems are required. As a consequence, the first proposed classification schemes assigned the filamentous and parenchymatous taxa to the green algal order Chaetophorales sensu Wille. The introduction of ultrastructural and molecular methods provided novel insight into algal evolution and generated taxonomic revisions based on phylogenetic inference. However, until now, the number of molecular phylogenetic studies focusing on the Chaetophorales s.s. is surprisingly low. To enh

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12

Nunes, Pedro Miguel Melo da Costa. "RNA interference and nucleolar dominance establishment in Arabidopsis suecica." Doctoral thesis, 2007. http://hdl.handle.net/10400.5/482.

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Doutoramento em Biologia - Instituto Superior de Agronomia<br>The discovery of small RNAs has added a new level to our understanding of gene regulation mechanisms. Small interfering RNAs (siRNAs) are involved in the establishment of repressive epigenetic marks in a variety of organisms by guiding RNA induced silencing complexes to homologous DNA sequences. Could the endogenous siRNA heterochromatic pathway be linked to the establishment of nucleolar dominance? The latter is a large scale manifestation of directed epigenetic gene silencing, resulting in the transcriptional inactivation of

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13

Golombek, Anja. "Inferring the phylogeny of problematic metazoan taxa using mitogenomic and phylogenomic data." Doctoral thesis, 2019. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-201905231583.

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The evolutionary origin and the phylogeny of higher metazoan taxa is still under debate although considerable progress has been made in the past 20 years. Metazoa represents a monophyletic group of highly diverse animals including Bilateria, Cnidaria, Porifera, Ctenophores, and Placozoa. Bilateria comprises the majority of metazoans and consists of three major clades: Deuterostomia, Spiralia (= Lophotrochozoa sensu lato), and Ecdysozoa, whereas the sister group taxa Spiralia and Ecdyzozoa form the monophyletic clade Protostomia. Molecular data have profoundly changed the view of the bilaterian

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14

Lee, Chi-Chang, and 李奇璋. "Mutation of a nucleolar protein Nopp140 gene dao-5 alters rDNA transcription and increases germ cell apoptosis in C. elegans." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/02339771039842235277.

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博士<br>國立陽明大學<br>微生物及免疫學研究所<br>102<br>Human diseases of impaired ribosome biogenesis resulting from disruption of rRNA biosynthesis or loss of ribosomal components are collectively described as “ribosomopathies”. Treacher-Collins syndrome (TCS), a representative human ribosomopathy with craniofacial abnormalities, is attributed to mutations in the tcof1 gene which has a homologous gene called nopp140. Previous studies demonstrated that the dao-5 (dauer and aged animal overexpression gene 5) of Caenorhabditis elegans is a member of nopp140 gene family and plays a role in nucleogenesis in the ear

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15

Boon, Eva. "The evolution of inter-genomic variation in arbuscular mycorrhizal fungi." Thèse, 2012. http://hdl.handle.net/1866/8689.

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Contexte: Les champignons mycorhiziens à arbuscules (AMF) établissent des relations symbiotiques avec la plupart des plantes grâce à leurs réseaux d’hyphes qui s’associent avec les racines de leurs hôtes. De précédentes études ont révélé des niveaux de variation génétique extrêmes pour des loci spécifiques permettant de supposer que les AMF peuvent contenir des milliers de noyaux génétiquement divergents dans un même cytoplasme. Si aucun processus de reproduction sexuée n’a jusqu’ici été observé chez ces mycorhizes, on constate cependant que des niveaux élevés de variation génétique peuvent êt

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