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Genome dynamics and chromosomal localization of the non-LTR retrotransposons Rex1 and Rex3 in Antarctic fish

Published online by Cambridge University Press:  27 February 2004

CATHERINE OZOUF-COSTAZ
Affiliation:
Muséum National d'Histoire Naturelle, Département Systématique et Évolution, Service de Systématique Moléculaire (CNRS IFR 101), 43, rue Cuvier, F-75231 Paris Cedex 05, France
JÜRGEN BRANDT
Affiliation:
Biofuture Research Group, Physiologische Chemie I, Biozentrum, University of Würzburg, am Hubland, D-97074 Würzburg, Germany
CORNELIA KÖRTING
Affiliation:
Biofuture Research Group, Physiologische Chemie I, Biozentrum, University of Würzburg, am Hubland, D-97074 Würzburg, Germany
EVA PISANO
Affiliation:
Department of Biology, University of Genova, Viale Benedetto XV, 5, 16132 Genova, Italy
CÉLINE BONILLO
Affiliation:
Muséum National d'Histoire Naturelle, Département Systématique et Évolution, Service de Systématique Moléculaire (CNRS IFR 101), 43, rue Cuvier, F-75231 Paris Cedex 05, France
JEAN-PIERRE COUTANCEAU
Affiliation:
Muséum National d'Histoire Naturelle, Département Systématique et Évolution, Service de Systématique Moléculaire (CNRS IFR 101), 43, rue Cuvier, F-75231 Paris Cedex 05, France
JEAN-NICOLAS VOLFF
Affiliation:
Biofuture Research Group, Physiologische Chemie I, Biozentrum, University of Würzburg, am Hubland, D-97074 Würzburg, Germany

Abstract

The non-long terminal repeat retrotransposons Rex1 and Rex3 were identified in 13 species of Antarctic fishes from five families of the suborder Notothenioidei. Partial reverse transcriptase gene sequences were characterized for Notothenia coriiceps, Trematomus newnesi and Dissostichus mawsoni (Nototheniidae), and Gymnodraco acuticeps (Bathydraconidae). Rex1 and Rex3 both formed a notothenioid-specific monophyletic group compared to the corresponding elements from other fishes. They globally evolved under purifying selection, showing their activity during notothenioid evolution. Fluorescence in situ hybridization analysis of the chromosomal distribution of Rex1 and Rex3 was performed for several notothenioid fish species. Rex1 was generally less abundant than Rex3, which was widely scattered on the chromosomes with more intense hybridization patterns in some specific zones. Particularly, Rex3 accumulated in Chionodraco hamatus in pericentromeric areas, short arms of some pairs as well as in an intercalary band in the long arm of the Y chromosome similarly to a previously described DNA transposon. Such pattern similarities suggest the presence of autosomal and gonosomal regions of preferential accumulation for different types of repeated elements in notothenioid genomes. To the best of our knowledge, this report is the first description and analysis of retrotransposable elements in Antarctic fish genomes.

Type
Research Article
Copyright
© Antarctic Science Ltd 2004

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