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岛屿溪蟾（两栖纲：无尾目：细趾蟾科）中的异形性染色体

Heteromorphic sex chromosomes in Eupsophus insularis (Amphibia: Anura: Leptodactylidae).

作者信息

Cuevas C C, Formas J R

机构信息

Institute of Zoology, Universidad Austral de Chile, Valdivia, Chile.

出版信息

Chromosome Res. 1996 Sep;4(6):467-70. doi: 10.1007/BF02265054.

DOI:10.1007/BF02265054
PMID:8889246
Abstract

The chromosomes of the Chilean frog Eupsophus insularis are described for the first time. This species has a chromosome number of 2n = 30, and based on the karyotype it is concluded that E. insularis is closely related to E. migueli. E. insularis has an XX/XY system of sex determination, and pericentromeric constitutive heterochromatin is present in all chromosomes except in the Y chromosome. It is postulated that the Y chromosome is derived from a small ancestral metacentric chromosome that lost its heterochromatic segment.

摘要

首次描述了智利蛙岛蛙（Eupsophus insularis）的染色体。该物种的染色体数目为2n = 30，基于核型分析得出结论，岛蛙与米氏蛙（E. migueli）密切相关。岛蛙具有XX/XY性别决定系统，除Y染色体外，所有染色体均存在着丝粒周围组成型异染色质。据推测，Y染色体源自一条小型祖先中着丝粒染色体，该染色体失去了其异染色质区段。

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Chromosome Res. 1996 Sep;4(6):467-70. doi: 10.1007/BF02265054.
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Zookeys. 2019 Jul 11;863:107-152. doi: 10.3897/zookeys.863.35484. eCollection 2019.
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