Gene changes may minimize masculinizing and defeminizing influences of exposure to male cotwins in female callitrichine primates
2016
Background
Sexual differentiation in female mammals can be altered by the proximity of male littermates in utero, a phenomenon known as the intrauterine position effect (IUP). Among simian primates, callitrichines (marmosets and tamarins) are likely candidates for IUP, since they exhibit obligate dizygotic twinning and fetuses share extensive vascularization in utero. In this paper, we determined whether female reproductive parameters are altered by gestating with a male twin and evaluated changes in genes associated with anti-Mullerian and steroid hormones in twinning callitrichine primates.
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