Faster evolution of Z-linked duplicate genes in chicken

Li Yan; Zhang Liqing; Zhang Dexiang; Zhang Xiquan; Lu Xuemei

doi:10.1016/S1673-8527(09)60087-4

Volume 37 Issue 10

Oct. 2010

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Article Navigation > Journal of Genetics and Genomics > 2010 > 37(10): 695-702

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Faster evolution of Z-linked duplicate genes in chicken

doi: 10.1016/S1673-8527(09)60087-4

Li Yan^{a, c, #},
Zhang Liqing^{d, #},
Zhang Dexiang^e,
Zhang Xiquan^e,
Lu Xuemei^{a, b}

a
State Key Laboratory of Biocontrol and International Center for Evolutionary and Genomic Studies, School of Life Science, Sun Yat-Sen University, Guangzhou 510275, China
b
Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing 10029, China
c
Key Laboratory of Conservation and Utilization of Bio-resource, Yunnan University, Yunnan 650091, China
d
Department of Computer Science, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0106, USA
e
Department of Animal Science, South China Agricultural University, Guangzhou 510642, China

More Information

Corresponding author: E-mail address: luxm@big.ac.cn (Lu Xuemei)
Received Date: 2010-03-31
Accepted Date: 2010-07-30
Rev Recd Date: 2010-07-29

Available Online: 2010-10-27

Publish Date: 2010-10-20

Abstract

Abstract

It has been shown that duplicate genes on the X chromosome evolve much faster than duplicate genes on autosomes inDrosophila melanogaster. However, whether this phenomenon is general and can be applied to other species is not known. Here we examined this issue in chicken that have heterogametic females (females have ZW sex chromosome). We compared sequence divergence of duplicate genes on the Z chromosome with those on autosomes. We found that duplications on the Z chromosome indeed evolved faster than those on autosomes and show distinct patterns of molecular evolution from autosomal duplications. Examination of the expression of duplicate genes revealed an enrichment of duplications on the Z chromosome having male-biased expression and an enrichment of duplications on the autosomes having female-biased expression. These results suggest an evolutionary trend of the recruitment of duplicate genes towards reproduction-specific function. The faster evolution of duplications on Z than on the autosomes is most likely contributed by the selective forces driving the fixation of adaptive mutations on Z. Therefore, the common phenomena observed in both flies and chicken suggest that duplicate genes on sex chromosomes have distinct dynamics and are more influenced by natural selection than autosomal duplications, regardless of the kind of sex determination systems.
- faster evolution,
- Z chromosome,
- gene duplication,
- gene expression,
- chicken genome

These authors contributed equally to this work.

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References(31)

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