A study appearing in the journal Human Genetics has identified several areas of DNA that appear to influence whether a man is heterosexual or gay.
University of Illinois at Chicago researcher Brian Mustanski found stretches of DNA that appeared to be linked to sexual orientation on three different chromosomes in the nucleus of cells of the human male. “There is no one ‘gay’ gene,” said Mustanski. “Sexual orientation is a complex trait, so it’s not surprising that we found several DNA regions involved in its expression. Our best guess is that multiple genes, potentially interacting with environmental influences, explain differences in sexual orientation.”
“Our study helps to establish that genes play an important role in determining whether a man is gay or heterosexual,” said Mustanski.