Molecular organization of 5S rDNAs in Rajidae (Chondrichthyes): Structural features and evolution of piscine 5S rRNA genes and nontranscribed intergenic spacers.

Journal of Molecular Evolution
Paola PasoliniF Tinti

Abstract

The genomic and gene organisation of 5S rDNA clusters have been extensively characterized in bony fish and eukaryotes, providing general issues for understanding the molecular evolution of this multigene DNA family. By contrast, the 5S rDNA features have been rarely investigated in cartilaginous fish (only three species). Here, we provide evidence for a dual 5S rDNA gene system in the Rajidae by sequence analysis of the coding region (5S) and adjacent nontranscribed spacer (NTS) in five Mediterranean species of rays (Rajidae), and in a large number of piscine taxa including lampreys and bony fish. As documented in several bony fish, two functional 5S rDNA types were found here also in the rajid genome: a short one (I) and a long one (II), distinguished by distinct 5S and NTS sequences. That the ancestral piscine genome had these two 5S rDNA loci might be argued from the occurrence of homologous dual gene systems that exist in several fish taxa and from 5S phylogenetic relationships. An extensive analysis of NTS-II sequences of Rajidae and Dasyatidae revealed the occurrence of large simple sequence repeat (SSR) regions that are formed by microsatellite arrays. The localization and organization of SSR within the NTS-II are conser...Continue Reading

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Citations

Feb 28, 2009·Journal of Molecular Evolution·Daniel CampoEva Garcia-Vazquez
Jul 24, 2008·Genetica·Mika FujiwaraSouichirou Kubota
Sep 26, 2007·Genome Génome / Conseil National De Recherches Canada·Ekaterina GornungFlavia Annesi
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Dec 17, 2011·Genome Génome / Conseil National De Recherches Canada·Daniel Campo, Eva García-Vázquez
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Mar 1, 2009·Marine Genomics·Eva Pisano, Laura Ghigliotti
Mar 25, 2011·Marine Genomics·Maria Alessandra MorescalchiTeresa Capriglione

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