Characterisation of 5S rDNA inGasterosteus aculeatus(Teleostei, Gasterosteidae)
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چکیده
منابع مشابه
Physical mapping of 18S-25S rDNA and 5S rDNA in Lupinus via fluorescent in situ hybridization.
Double-target fluorescent in situ hybridization (FISH) was used to determine the genomic distribution of ribosomal RNA genes in five Lupinus species: L. cosentinii (2n=32), L. pilosus (2n=42), L. angustifolius (2n=40), L. luteus (2n=52) and L. mutabilis (2n=48). 18S-25S rDNA and 5S rDNA were used as probes. Some interspecific variation was observed in the number and size of the 18S-25S rDNA loc...
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Studies on ribosomal RNA genes have gained prominence in a broad range of animals and plants, especially in relation to species or population characterization, evolutionary relationships and genome structuring. The 5S rDNA array consists of multiple copies of a highly conserved 120 base pair (bp) coding sequence, separated by a variable nontranscribed spacer (NTS) (LONG and DAVID 1980). While t...
متن کاملNucleolar Association and Transcriptional Inhibition through 5S rDNA in Mammals
Changes in the spatial positioning of genes within the mammalian nucleus have been associated with transcriptional differences and thus have been hypothesized as a mode of regulation. In particular, the localization of genes to the nuclear and nucleolar peripheries is associated with transcriptional repression. However, the mechanistic basis, including the pertinent cis- elements, for such asso...
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In this study, we attempted a molecular characterization of the 5S rDNA in two closely related species of carcharhiniform sharks, Rhizoprionodon lalandii and Rhizoprionodon porosus, as well as a further comparative analysis of available data on lampreys, several fish groups and other vertebrates. Our data show that Rhizoprionodon sharks carry two 5S rDNA classes in their genomes: a short repeat...
متن کاملExpression of yeast 5S RNA is independent of the rDNA enhancer region.
In the yeast Saccharomyces cerevisiae, each of the tandemly repeated ribosomal RNA genes carries a 5S gene within the 'non-transcribed' spacer region. These 5S RNA genes lie between the rDNA enhancer and the promoter of rRNA transcription. Since there is roughly equimolar synthesis of 5S RNA and the 35S rRNA precursor transcript we asked whether the enhancer plays a role in regulating the trans...
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ژورنال
عنوان ژورنال: Italian Journal of Zoology
سال: 1999
ISSN: 1125-0003,1748-5851
DOI: 10.1080/11250009909356266