饰纹姬蛙（Physalaemus ephippifer）（施泰因达赫纳，1864年）（无尾目，细趾蟾科）的异形Z和W性染色体
Heteromorphic Z and W sex chromosomes in Physalaemus ephippifer (Steindachner, 1864) (Anura, Leiuperidae).
作者信息
Nascimento Juliana, Quinderé Yeda Rumi Serra Douglas, Recco-Pimentel Shirlei Maria, Lima Janaína Reis Ferreira, Lourenço Luciana Bolsoni
机构信息
Departamento de Anatomia, Biologia Celular, Fisiologia e Biofísica, Instituto de Biologia, Universidade Estadual de Campinas-UNICAMP, 6109, 13083-863 Campinas, São Paulo, Brazil.
出版信息
Genetica. 2010 Dec;138(11-12):1127-32. doi: 10.1007/s10709-010-9501-9. Epub 2010 Sep 30.
Heteromorphisms between sex chromosomes are rarely found in anurans and sex chromosome differentiation is considered to be a set of recent recurrent events in the evolutionary history of this group. This paper describes for the first time heteromorphic sex chromosomes Z and W in the leiuperid genus Physalaemus. They were found in P. ephippifer, a species of the P. cuvieri group, and corresponded to the eighth pair of its karyotype. The W chromosome differed from the Z chromosome by the presence of an additional segment in the short arm, composed of a distal NOR and an adjacent terminal DAPI-positive C-band. The identification of this sex chromosome pair may help in future investigations into the sex determining genes in the genus Physalaemus.
在无尾两栖类中，性染色体异形现象极为罕见，且性染色体分化被认为是该类群进化史上一系列近期反复出现的事件。本文首次描述了细趾蟾属（Physalaemus）中的异形性染色体Z和W。它们在库氏细趾蟾组（P. cuvieri group）的物种饰纹细趾蟾（P. ephippifer）中被发现，对应于其核型的第八对染色体。W染色体与Z染色体的不同之处在于其短臂上存在一个额外片段，该片段由一个远端核仁组织区（NOR）和一个相邻的末端DAPI阳性C带组成。这一性染色体对的鉴定可能有助于未来对细趾蟾属性别决定基因的研究。
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