Evolutionary strata on the chicken Z chromosome: Implications for sex chromosome evolution

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Etat: Public
Version: de l'auteur
ID Serval
serval:BIB_7AF314236364
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Evolutionary strata on the chicken Z chromosome: Implications for sex chromosome evolution
Périodique
Genetics
Auteur(s)
Lawson Handley  L-J., Ceplitis  H., Ellegren  H.
Statut éditorial
Publié
Date de publication
2004
Volume
167
Pages
367-376
Notes
ID7530AB6033B5_
Résumé
The human X chromosome exhibits four "evolutionary strata" interpreted to represent distinct steps in the process whereby recombination became arrested between the proto X and proto Y. To test if this is a general feature of sex chromosome evolution we studied the Z-W sex chromosomes of birds which have female rather than male heterogamety and evolved from a different autosome pair than the mammalian X and Y. Here we analyze all five known gametologous Z-W gene pairs to investigate the "strata" hypothesis in birds. Comparisons of the rates of synonymous substitution and intronic divergence between Z and W gametologs reveal the presence of at least two evolutionary strata spread over the p and q arm of the chicken Z chromosome. A phylogenetic analysis of intronic sequence data from different avian lineages indicates that Z-W recombination ceased in the oldest stratum (on Zq; CHD1Z PKCIZ and SPINZ) 102-170 million years ago (Mya) before the split of the Neoaves and Eoaves. However recombination continued in the second stratum (on Zp; AD012Z and ATP5A1Z) until after the divergence of extant avian orders with Z and W diverging 58-85 Mya. Our data suggest that progressive and stepwise cessation of recombination is a general feature behind sex chromosome evolution
Création de la notice
19/11/2007 10:35
Dernière modification de la notice
20/08/2019 14:36
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