Nonrandom representation of sex-biased genes on chicken Z chromosome

被引：53

作者：

Storchova, R.

Divina, P.

机构：

[1] Acad Sci Czech Republ, Inst Mol Genet, CZ-14220 Prague 4, Czech Republic

[2] Ctr Appl Genom, CZ-14220 Prague 4, Czech Republic

来源：

JOURNAL OF MOLECULAR EVOLUTION | 2006年 / 63卷 / 05期

关键词：

comparative genomics; chicken; dosage compensation; evolution; gene expression; sex chromosomes; Z chromosome;

D O I：

10.1007/s00239-006-0022-1

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

Several lines of evidence suggest that the X chromosome of various animal species has an unusual complement of genes with sex-biased or sex-specific expression. However, the study of the X chromosome gene content in different organisms provided conflicting results. The most striking contrast concerns the male-biased genes, which were reported to be almost depleted from the X chromosome in Drosophila but overrepresented on the X chromosome in mammals. To elucidate the reason for these discrepancies, we analysed the gene content of the Z chromosome in chicken. Our analysis of the publicly available expressed sequence tags (EST) data and genome draft sequence revealed a significant underrepresentation of ovary-specific genes on the chicken Z chromosome. For the brain-expressed genes, we found a significant enrichment of male-biased genes but an indication of underrepresentation of female-biased genes on the Z chromosome. This is the first report on the nonrandom gene content in a homogametic sex chromosome of a species with heterogametic female individuals. Further comparison of gene contents of the independently evolved X and Z sex chromosomes may offer new insight into the evolutionary processes leading to the nonrandom genomic distribution of sex-biased and sex-specific genes.

引用

页码：676 / 681

页数：6

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