Ribosomal genes in notothenioid fishes: focus on the chromosomal organisation
This mini-review makes a survey and a summary of some major issues concerning the chromosomal organisation of ribosomal genes in fish genomes, by using Notothenioidei as the model. The increasing body of information, published during the last two decades on the chromosomal mapping of the two ribosom...
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ftunivgenova:oai:iris.unige.it:11567/224594 2023-11-12T04:06:29+01:00 Ribosomal genes in notothenioid fishes: focus on the chromosomal organisation PISANO, EVA GHIGLIOTTI, LAURA Pisano, Eva Ghigliotti, Laura 2009 STAMPA http://hdl.handle.net/11567/224594 eng eng ELSEVIER country:GBR volume:2 firstpage:75 lastpage:80 numberofpages:6 journal:MARINE GENOMICS http://hdl.handle.net/11567/224594 info:eu-repo/semantics/article 2009 ftunivgenova 2023-10-18T20:45:14Z This mini-review makes a survey and a summary of some major issues concerning the chromosomal organisation of ribosomal genes in fish genomes, by using Notothenioidei as the model. The increasing body of information, published during the last two decades on the chromosomal mapping of the two ribosomal genes classes (45S rDNA and 5S rDNA) in notothenioids, makes it possible to recognise the main evolutionary trends across the phylogeny of the group. As one of the major features, the rDNA clusters are organised in a single chromosomal locus in most of the species. This locus is located at different positions along the chromosomes in the basal groups (non-Antarctic Clade), whereas it maintains a strongly conserved location in the cold-adapted species (Antarctic Clade). Important structural changes, leading to the co-localisation of the two ribosomal gene classes, occurred early in the notothenioid phylogeny, perhaps in the common ancestor of the Eleginopidae and Nototheniidae. The cytogenetic evidences indicate that an increased amount of ribosomal genes, organised in two large chromosomal loci, is present in the giant Antarctic fish Dissostichus mawsoni. This gain in rRNA genes is an important genomic change, having possible implications for the fitness of this notothenioid fish that combines large size, pelagic lifestyle and cold-adaptation. Article in Journal/Newspaper Antarc* Antarctic Università degli Studi di Genova: CINECA IRIS Antarctic |
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Open Polar |
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Università degli Studi di Genova: CINECA IRIS |
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ftunivgenova |
language |
English |
description |
This mini-review makes a survey and a summary of some major issues concerning the chromosomal organisation of ribosomal genes in fish genomes, by using Notothenioidei as the model. The increasing body of information, published during the last two decades on the chromosomal mapping of the two ribosomal genes classes (45S rDNA and 5S rDNA) in notothenioids, makes it possible to recognise the main evolutionary trends across the phylogeny of the group. As one of the major features, the rDNA clusters are organised in a single chromosomal locus in most of the species. This locus is located at different positions along the chromosomes in the basal groups (non-Antarctic Clade), whereas it maintains a strongly conserved location in the cold-adapted species (Antarctic Clade). Important structural changes, leading to the co-localisation of the two ribosomal gene classes, occurred early in the notothenioid phylogeny, perhaps in the common ancestor of the Eleginopidae and Nototheniidae. The cytogenetic evidences indicate that an increased amount of ribosomal genes, organised in two large chromosomal loci, is present in the giant Antarctic fish Dissostichus mawsoni. This gain in rRNA genes is an important genomic change, having possible implications for the fitness of this notothenioid fish that combines large size, pelagic lifestyle and cold-adaptation. |
author2 |
Pisano, Eva Ghigliotti, Laura |
format |
Article in Journal/Newspaper |
author |
PISANO, EVA GHIGLIOTTI, LAURA |
spellingShingle |
PISANO, EVA GHIGLIOTTI, LAURA Ribosomal genes in notothenioid fishes: focus on the chromosomal organisation |
author_facet |
PISANO, EVA GHIGLIOTTI, LAURA |
author_sort |
PISANO, EVA |
title |
Ribosomal genes in notothenioid fishes: focus on the chromosomal organisation |
title_short |
Ribosomal genes in notothenioid fishes: focus on the chromosomal organisation |
title_full |
Ribosomal genes in notothenioid fishes: focus on the chromosomal organisation |
title_fullStr |
Ribosomal genes in notothenioid fishes: focus on the chromosomal organisation |
title_full_unstemmed |
Ribosomal genes in notothenioid fishes: focus on the chromosomal organisation |
title_sort |
ribosomal genes in notothenioid fishes: focus on the chromosomal organisation |
publisher |
ELSEVIER |
publishDate |
2009 |
url |
http://hdl.handle.net/11567/224594 |
geographic |
Antarctic |
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Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
volume:2 firstpage:75 lastpage:80 numberofpages:6 journal:MARINE GENOMICS http://hdl.handle.net/11567/224594 |
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1782327565414825984 |