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First published online 22 August 2007
doi: 10.1242/dev.001107


Development 134, 3401-3411 (2007)
Published by The Company of Biologists 2007


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Review

Retinoic acid, meiosis and germ cell fate in mammals

Josephine Bowles and Peter Koopman*

Division of Molecular Genetics and Development, and ARC Centre of Excellence in Biotechnology and Development, Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD 4072, Australia.

* Author for correspondence (e-mail: p.koopman{at}imb.uq.edu.au)

SUMMARY

Although mammalian sex is determined genetically, the sex-specific development of germ cells as sperm or oocytes is initiated by cues provided by the gonadal environment. During embryogenesis, germ cells in an ovary enter meiosis, thereby committing to oogenesis. By contrast, germ cells in a testicular environment do not enter meiosis until puberty. Recent findings indicate that the key to this sex-specific timing of meiosis entry is the presence or absence of the signaling molecule retinoic acid. Although this knowledge clarifies a long-standing mystery in reproductive biology, it also poses many new questions, which we discuss in this review.


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© The Company of Biologists Ltd 2007