Cytogenetic mapping of immunoglobulin heavy chain genes in Antarctic fish

The chromosomal location of the IgH locus has been analyzed in several bony fish of the Antarctic perciform group Notothenioidei. Two IgH probes were prepared from the species Trematomus bernacchii (family Nototheniidae, tribe Trematominae) and mapped onto the chromosomes of ten species belonging to...

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Veröffentlicht in:Genetica 2007-05, Vol.130 (1), p.9-17
Hauptverfasser: Pisano, Eva, Coscia, Maria Rosaria, Mazzei, Federico, Ghigliotti, Laura, Coutanceau, Jean-Pierre, Ozouf-Costaz, Catherine, Oreste, Umberto
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container_end_page 17
container_issue 1
container_start_page 9
container_title Genetica
container_volume 130
creator Pisano, Eva
Coscia, Maria Rosaria
Mazzei, Federico
Ghigliotti, Laura
Coutanceau, Jean-Pierre
Ozouf-Costaz, Catherine
Oreste, Umberto
description The chromosomal location of the IgH locus has been analyzed in several bony fish of the Antarctic perciform group Notothenioidei. Two IgH probes were prepared from the species Trematomus bernacchii (family Nototheniidae, tribe Trematominae) and mapped onto the chromosomes of ten species belonging to the same genus (Trematomus) and in two outgroups, through one-color and two-color FISH. A single location of the IgH locus was found in the majority of the species examined, including the outgroups, whereas in four of them the IgH genes splited to two chromosomal loci. RT-PCR experiments revealed the presence of three allelic sequences in T. newnesi, a species in which the IgH genes were organized in two chromosomal loci. Possible pathways leading to IgH genes duplication during the diversification of trematomine fishes were inferred from the analysis of the FISH patterns in a phylogenetic context. The present work provides the first comprehensive picture of IgH genes organization at chromosomal level in a bony fish group.
doi_str_mv 10.1007/s10709-006-0015-4
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subjects Animals
Antarctic fish
Antarctic Regions
Chromosome Mapping
Chromosomes
Cytogenetic mapping
DNA, Complementary - analysis
Fish
Genes, Immunoglobulin Heavy Chain
Genomics
IgH locus
In Situ Hybridization, Fluorescence
Nototheniidae
Notothenioidei
Perciformes - genetics
Perciformes - immunology
Phylogeny
Trematominae
Trematomus
Trematomus bernacchii
title Cytogenetic mapping of immunoglobulin heavy chain genes in Antarctic fish
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