Med1 regulates meiotic progression during spermatogenesis in mice

Reproduction : the Official Journal of the Society for the Study of Fertility
Jessica M HuszarChristopher J Payne

Abstract

Spermatogenesis is a highly coordinated process. Signaling from nuclear hormone receptors, like those for retinoic acid (RA), is important for normal spermatogenesis. However, the mechanisms regulating these signals are poorly understood. Mediator complex subunit 1 (MED1) is a transcriptional enhancer that directly modulates transcription from nuclear hormone receptors. MED1 is present in male germ cells throughout mammalian development, but its function during spermatogenesis is unknown. To determine its role, we generated mice lacking Med1 specifically in their germ cells beginning just before birth. Conditional Med1 knockout males are fertile, exhibiting normal testis weights and siring ordinary numbers of offspring. RA-responsive gene products stimulated by RA gene 8 (Stra8) and synaptonemal complex protein 3 (Sycp3) are first detected in knockout spermatogonia at the expected time points during the first wave of spermatogenesis, and persist with normal patterns of cellular distribution in adult knockout testes. Meiotic progression, however, is altered in the absence of Med1. At postnatal day 7 (P7), zygotene-stage knockout spermatocytes are already detected, unlike in control testes, with fewer pre-leptotene-stage cells an...Continue Reading

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Citations

May 24, 2016·Journal of Genetics and Genomics = Yi Chuan Xue Bao·Meizhu BaiJinsong Li
Jun 12, 2016·Developmental Biology·Manuel Buendía-Monreal, C Stewart Gillmor
Aug 4, 2016·Reproduction : the Official Journal of the Society for the Study of Fertility·Jonathan T BusadaChristopher B Geyer

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