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首页> 外文期刊>Molecular cytogenetics >Karyotypic analysis and FISH mapping of microsatellite motifs reveal highly differentiated XX/XY sex chromosomes in the pink-tailed worm-lizard (Aprasia parapulchella, Pygopodidae, Squamata)
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Karyotypic analysis and FISH mapping of microsatellite motifs reveal highly differentiated XX/XY sex chromosomes in the pink-tailed worm-lizard (Aprasia parapulchella, Pygopodidae, Squamata)

机译：核型分析和微卫星基序的FISH定位揭示了粉红色尾蜥蜴（Aprasia parapulchella，Pygopodidae，Squamata）中高度分化的XX / XY性染色体。

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Background The infraorder Gekkota is intriguing because it contains multiple chromosomal and environmental sex determination systems that vary even among closely related taxa. Here, we compare male and females karyotypes of the pink-tailed worm-lizard (Aprasia parapulchella), a small legless lizard belonging to the endemic Australian family Pygopodidae. Results We applied comparative genomic hybridization to reveal an XX/XY sex chromosome system in which the Y chromosome is highly differentiated from the X in both gross morphology and DNA sequence. In addition, FISH mapping has revealed that two microsatellite repeat motifs, (AGAT)n and (AC)n, have been amplified multiple times on the Y chromosome. Conclusion XY karyotypes are found in other pygopodids (Delma inornata and Lialis burtonis), suggesting that the common ancestor of Pygopodidae also had XY sex chromosomes. However, the morphology and size of the Y chromosomes are different among the three species, suggesting that the processes underlying the evolution of sex chromosomes in the Pygopodidae involved chromosome rearrangements and accumulation and amplification of repeats.
机译：背景知识地下Gekkota之所以令人着迷，是因为它包含多个染色体和环境性别确定系统，即使在密切相关的类群之间，它们也有所不同。在这里，我们比较了粉红色尾蠕虫蜥蜴（Aprasia parapulchella）的一种核型和雌性核型，这是一种小型的没有腿的蜥蜴，属于澳大利亚特有的蛇蝎科。结果我们应用比较基因组杂交技术揭示了XX / XY性染色体系统，其中Y染色体在总体形态和DNA序列上与X高度不同。此外，FISH作图揭示了两个微卫星重复基序（AGAT）n和（AC）n在Y染色体上已被多次扩增。结论XY染色体核型存在于其他Pygopodids（Delma inornata和Lialis burtonis）中，这表明Pygopodidae的共同祖先也具有XY性染色体。但是，这三个物种的Y染色体的形态和大小是不同的，这表明Pygopodidae中性染色体的进化过程涉及染色体重排以及重复序列的积累和扩增。

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