A sex-specific transcription factor controls male identity in a simultaneous hermaphrodite.

A sex-specific transcription factor controls male identity in a simultaneous hermaphrodite.
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DOI:
10.1038/ncomms2811
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发表时间:
2013
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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在许多动物群体中都发现了两性生殖状态和雌雄异株生殖状态之间的进化转变。为了理解这种转变,重要的是描述后生动物利用的不同性别决定模式。目前,关于同时的两性人如何在单个个体中指定和维持男性和女性器官的情况知之甚少。在这里,我们发现一个性别特异的基因,Smed-DMD-1,编码一个预测的双性/雄性异常-3(DM)结构域转录因子,是同时两性的蜘蛛SchmidteMedterranea中的雄性生殖细胞指定所必需的。DMD-1在睾丸和男性附属生殖器官的维持和再生中具有男性特有的作用。此外,DMD-1的同源物在曼氏血吸虫(一种雌雄异株的衍生扁虫)中显示了男性特有的表达。这些结果证明了DM结构域基因在钩体动物性发育中的作用是保守的,并提出了一种通过调节性别特异性途径来驱动从两性向雌雄同体的转变的方法。两性人在单个个体中发育和维持雄性和雌性生殖器官。Chong等人。表明DM结构域转录因子是雄性生殖细胞再生所必需的,并在两性的扁平线虫SchmidteMedterranea中保持‘雄性’。
Evolutionary transitions between hermaphroditic and dioecious reproductive states are found in many groups of animals. To understand such transitions, it is important to characterize diverse modes of sex determination utilized by metazoans. Currently, little is known about how simultaneous hermaphrodites specify and maintain male and female organs in a single individual. Here we show that a sex-specific gene, Smed-dmd-1 encoding a predicted doublesex/male-abnormal-3 (DM) domain transcription factor, is required for specification of male germ cells in a simultaneous hermaphrodite, the planarian Schmidtea mediterranea. dmd-1 has a male-specific role in the maintenance and regeneration of the testes and male accessory reproductive organs. In addition, a homologue of dmd-1 exhibits male-specific expression in Schistosoma mansoni, a derived, dioecious flatworm. These results demonstrate conservation of the role of DM domain genes in sexual development in lophotrochozoans and suggest one means by which modulation of sex-specific pathways can drive the transition from hermaphroditism to dioecy. Hermaphrodites develop and maintain male and female reproductive organs in a single individual. Chong et al. show that a DM domain transcription factor is required for male germ cell regeneration and maintains ‘maleness’ in a hermaphrodite, the planarian flatworm Schmidtea mediterranea.
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