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The Evolutionary Tempo of Sex Chromosome Degradation in Carica papaya

Wu, Meng
http://rave.ohiolink.edu/etdc/view?acc_num=miami1406797727

Abstract Details

2014, Master of Science, Miami University, Botany.
The young Y chromosome in papaya provides a good model to study the evolutionary tempo of Y chromosome degradation. In this study, comparative genetic analyses of 70 X-Y gene pairs showed that Y-linked genes have significantly more deleterious mutations than X-linked genes, suggesting the degeneration on the Y. However, this asymmetric evolutionary pattern is only confined to the oldest stratum, indicating a relatively slow degeneration tempo of the papaya Y chromosome compared to neo-sex chromosomes in Drosophila. Population genetic analyses based on protein-coding sequence variation of six X-Y gene pairs on the oldest stratum also identified elevated nonsynonymous polymorphisms and reduced codon bias on the target X region relative to the neutrally evolving autosomal regions. This may be explained by weaker purifying selection and a widespread genetic hitchhiking. Here we discuss how the unique genomic features of pericentromeric location of the papaya sex-determining region may have influenced its evolution.
Richard Moore (Advisor)
James Hickey (Committee Member)
Chun Liang (Committee Member)
64 p.
Biology; Botany; Evolution and Development

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Citations

  • Wu, M. (2014). The Evolutionary Tempo of Sex Chromosome Degradation in Carica papaya [Master's thesis, Miami University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=miami1406797727

    APA Style (7th edition)

  • Wu, Meng. The Evolutionary Tempo of Sex Chromosome Degradation in Carica papaya. 2014. Miami University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=miami1406797727.

    MLA Style (8th edition)

  • Wu, Meng. "The Evolutionary Tempo of Sex Chromosome Degradation in Carica papaya." Master's thesis, Miami University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=miami1406797727

    Chicago Manual of Style (17th edition)

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© 2014, all rights reserved.
This open access ETD is published by Miami University and OhioLINK.