In Situ Gene Mapping of Two Genes Supports Independent Evolution of Sex Chromosomes in Cold-Adapted Antarctic Fish
| Type | Article | ||||||||
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| Date | 2013 | ||||||||
| Language | English | ||||||||
| Author(s) | Ghigliotti Laura1, Cheng C. -H. Christina2, Bonillo Celine3, 4, Coutanceau Jean-Pierre3, 4, Pisano Eva1 | ||||||||
| Affiliation(s) | 1 : Univ Genoa, Dept Earth Environm & Life Sci DISTAV, I-16132 Genoa, Italy. 2 : Univ Illinois, Dept Anim Biol, Urbana, IL 61801 USA. 3 : MNHN, SSM, F-75231 Paris, France. 4 : MNHN, CNRS, UMR 7138, Dept Systemat & Evolut, F-75231 Paris, France. |
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| Source | Biomed Research International (2314-6133) (Hindawi Publishing Corporation), 2013 , Vol. 2013 , N. ID 243938 , P. 1-8 | ||||||||
| DOI | 10.1155/2013/243938 | ||||||||
| WOS© Times Cited | 9 | ||||||||
| Abstract | Two genes, that is, 5S ribosomal sequences and antifreeze glycoprotein (AFGP) genes, were mapped onto chromosomes of eight Antarctic notothenioid fish possessing a X1X1X2X2/X1X2Y sex chromosome system, namely, Chionodraco hamatus and Pagetopsis macropterus (family Channichthyidae), Trematomus hansoni, T. newnesi, T. nicolai, T. lepidorhinus, and Pagothenia borchgrevinki (family Nototheniidae), and Artedidraco skottsbergi (family Artedidraconidae). Through fluorescence in situ hybridization (FISH), we uncovered distinct differences in the gene content of the Y chromosomes in the eight species, with C. hamatus and P. macropterus standing out among others in bearing 5S rDNA and AFGP sequences on their Y chromosomes, respectively. Both genes were absent from the Y chromosomes of any analyzed species. The distinct patterns of Y and non-Y chromosome association of the 5S rDNA and AFGP genes in species representing different Antarctic fish families support an independent origin of the sex heterochromosomes in notothenioids with interesting implications for the evolutionary/adaptational history of these fishes living in a cold-stable environment. | ||||||||
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