大学共同利用機関法人 自然科学研究機構

基礎生物学研究所

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国際共同研究成果 - 成果報告

The mammalian doublesex homolog DMRT1 is a transcriptional gatekeeper that controls the mitosis versus meiosis decision in male germ cells.

Authors Matson CK, Murphy MW, Griswold MD, Yoshida S, Bardwell VJ, Zarkower D.
Journal Developmental Cell. 2010 Oct 19;19(4):612-24.
Link PubMed (http://www.ncbi.nlm.nih.gov/pubmed/20951351)

基礎生物学研究所生殖細胞研究部門とUniversity of Minnesota, USAなどとの共同研究成果です。

Abstract

The switch from mitosis to meiosis is a unique feature of germ cell development. In mammals, meiotic initiation requires retinoic acid (RA), which activates meiotic inducers, including Stra8, but how the switch to meiosis is controlled in male germ cells (spermatogonia) remains poorly understood. Here we examine the role of the Doublesex-related transcription factor DMRT1 in adult spermatogenesis using conditional gene targeting in the mouse. Loss of Dmrt1 causes spermatogonia to precociously exit the spermatogonial program and enter meiosis. Therefore, DMRT1 determines whether male germ cells undergo mitosis and spermatogonial differentiation or meiosis. Loss of Dmrt1 in spermatogonia also disrupts cyclical gene expression in Sertoli cells. DMRT1 acts in spermatogonia to restrict RA responsiveness, directly repress Stra8 transcription, and activate transcription of the spermatogonial differentiation factor Sohlh1, thereby preventing meiosis and promoting spermatogonial development. By coordinating spermatogonial development and mitotic amplification with meiosis, DMRT1 allows abundant, continuous production of sperm.

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