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Feedback control of sex determination by dosage compensation revealed through Caenorhabditis elegans sdc-3 mutations.

Genetics. 1993 Apr;133(4):875-96. doi:10.1093/genetics/133.4.875
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摘要


In Caenorhabditis elegans, sex determination and dosage compensation are coordinately controlled through a group of genes that respond to the primary sex determination signal. Here we describe a new gene, sdc-3, that also controls these processes. In contrast to previously described genes, the sex determination and dosage compensation activities of sdc-3 are separately mutable, indicating that they function independently. Paradoxically, the sdc-3 null phenotype fails to reveal the role of sdc-3 in sex determination: sdc-3 null mutations that lack both activities disrupt dosage compensation but cause no overt sexual transformation. We demonstrate that the dosage compensation defect of sdc-3 null alleles suppresses their sex determination defect. This self-suppression phenomenon provides a striking example of how a disruption in dosage compensation can affect sexual fate. We propose that the suppression occurs via a feedback mechanism that acts at an early regulatory step in the sex determination pathway to promote proper sexual identity.

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