Rapid divergence and expansion of the X chromosome in papaya

Gschwend A.R.; Yu Q.; Tong E.J.Zeng F.Han J.VanBuren R.Aryal R.Charlesworth D.Moore P.H.Paterson A.H.Ming R.

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Rapid divergence and expansion of the X chromosome in papaya

机译：Rapid divergence and expansion of the X chromosome in papaya

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X chromosomes have long been thought to conserve the structure and gene content of the ancestral autosome from which the sex chromosomes evolved. We compared the recently evolved papaya sex chromosomes with a homologous autosome of a close relative, the monoecious Vasconcellea monoica, to infer changes since recombination stopped between the papaya sex chromosomes. We sequenced 12 V. monoica bacterial artificial chromosomes, 11 corresponding to the papaya X-specific region, and 1 to a papaya autosomal region. The combined V. monoica X-orthologous sequences are much shorter (1.10 Mb) than the corresponding papaya region (2.56 Mb). Given that the V. monoica genome is 41 larger than that of papaya, this finding suggests considerable expansion of the papaya X; expansion is supported by a higher repetitive sequence content of the X compared with the papaya autosomal sequence. The alignable regions include 27 transcriptencoding sequences, only 6 of which are functional X/V. monoica gene pairs. Sequence divergence from the V. monoica orthologs is almost identical for papaya X and Y alleles; the Carica-Vasconcellea split therefore occurred before the papaya sex chromosomes stopped recombining, making V. monoica a suitable outgroup for inferring changes in papaya sex chromosomes. The papaya X and the hermaphrodite-specific region of the Yh chromosome and V. monoica have all gained and lost genes, including a surprising amount of changes in the X.

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《Proceedings of the National Academy of Sciences of the United States of America》 |2012年第34期|13716-13721|共6页
作者
Gschwend A.R.; Yu Q.; Tong E.J.Zeng F.Han J.VanBuren R.Aryal R.Charlesworth D.Moore P.H.Paterson A.H.Ming R.;
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作者单位

Department of Plant Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, United States;

Texas AgriLife Research Center, Department of Plant Pathology and Microbiology, Texas A and M University, Weslaco, TX 78596, United States;

Hawaii Agriculture Research Center, Kunia, HI 96759, United StatesInstitute of Evolutionary Biology, University of Edinburgh, Edinburgh EH9 3JT, United KingdomPlant Genome Mapping Laboratory, University of Georgia, Athens, GA 30606, United States;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
Carica papaya; Centromere of X chromosome; Gene gains and losses; Sex chromosome evolution; Suppression of recombination;

Rapid divergence and expansion of the X chromosome in papaya

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