三倍体滨鹬雌鸟为 W 染色体在鸟类性别决定中的作用提供支持。
Triploid plover female provides support for a role of the W chromosome in avian sex determination.
机构信息
Museum of Comparative Zoology, Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138, USA.
出版信息
Biol Lett. 2012 Oct 23;8(5):787-9. doi: 10.1098/rsbl.2012.0329. Epub 2012 May 30.
Two models, Z Dosage and Dominant W, have been proposed to explain sex determination in birds, in which males are characterized by the presence of two Z chromosomes, and females are hemizygous with a Z and a W chromosome. According to the Z Dosage model, high dosage of a Z-linked gene triggers male development, whereas the Dominant W model postulates that a still unknown W-linked gene triggers female development. Using 33 polymorphic microsatellite markers, we describe a female triploid Kentish plover Charadrius alexandrinus identified by characteristic triallelic genotypes at 14 autosomal markers that produced viable diploid offspring. Chromatogram analysis showed that the sex chromosome composition of this female was ZZW. Together with two previously described ZZW female birds, our results suggest a prominent role for a female determining gene on the W chromosome. These results imply that avian sex determination is more dynamic and complex than currently envisioned.
两种模型，Z 剂量模型和显性 W 模型，被用来解释鸟类的性别决定，其中雄性的特征是存在两条 Z 染色体，而雌性是半合子，带有一条 Z 染色体和一条 W 染色体。根据 Z 剂量模型，Z 连锁基因的高剂量触发雄性发育，而显性 W 模型则假定一个未知的 W 连锁基因触发雌性发育。利用 33 个多态性微卫星标记，我们描述了一只雌性三倍体蛎鹬 Charadrius alexandrinus，通过 14 个常染色体标记的特征三等位基因型来识别，这些标记产生了可育的二倍体后代。色谱分析表明，这只雌性的性染色体组成为 ZZW。结合之前描述的两只 ZZW 雌性鸟类，我们的结果表明 W 染色体上存在一个主要的雌性决定基因。这些结果表明，鸟类的性别决定比目前想象的更加动态和复杂。
Zotero 插件