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Lack of Dosage Compensation Accompanies the Arrested Stage of Sex Chromosome Evolution in Ostriches
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Evolutionary Biology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Evolutionary Biology.
2013 (English)In: Molecular biology and evolution, ISSN 0737-4038, E-ISSN 1537-1719, Vol. 30, no 4, 806-810 p.Article in journal (Refereed) Published
Abstract [en]

Sex chromosome evolution is usually seen as a process that, once initiated, will inevitably progress toward an advanced stage of degeneration of the nonrecombining chromosome. However, despite evidence that avian sex chromosome evolution was initiated > 100 Ma, ratite birds have been trapped in an arrested stage of sex chromosome divergence. We performed RNA sequencing of several tissues from male and female ostriches and assembled the transcriptome de novo. A total of 315 Z-linked genes fell into two categories: those that have equal expression level in the two sexes (for which Z-W recombination still occurs) and those that have a 2-fold excess of male expression (for which Z-W recombination has ceased). We suggest that failure to evolve dosage compensation has constrained sex chromosome divergence in this basal avian lineage. Our results indicate that dosage compensation is a prerequisite for, not only a consequence of, sex chromosome evolution.

Place, publisher, year, edition, pages
2013. Vol. 30, no 4, 806-810 p.
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Natural Sciences
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URN: urn:nbn:se:uu:diva-199717DOI: 10.1093/molbev/mst009ISI: 000317002300010OAI: oai:DiVA.org:uu-199717DiVA: diva2:621082
Available from: 2013-05-13 Created: 2013-05-13 Last updated: 2017-12-06Bibliographically approved

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Ellegren, Hans

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