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

Tracy Chong, James J. Collins, John L. Brubacher, David Zarkower, Phillip A. Newmark

    Research output: Contribution to journalArticlepeer-review


    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.

    Original languageEnglish (US)
    Article number1814
    JournalNature communications
    StatePublished - 2013

    ASJC Scopus subject areas

    • General Chemistry
    • General Biochemistry, Genetics and Molecular Biology
    • General Physics and Astronomy


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