Can you tell that a man is GAY by what's in his jeans?

What the new

‘gay genes’

tell us about 

 

sexual orientation

Two gene variants have been found to be more common in gay men, adding to mounting evidence that sexual orientation is at least partly biologically determined. How does this change what we already knew?

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One of the genes, which sits on chromosome 13, is active in a part of the brain called the diencephalon. Interestingly, this brain region contains the hypothalamus, which was identified in 1991 as differing in size between gay and straight men. This was discovered by neuroscientist Simon LeVay, who says he is excited that the gene discovery seems to fit with what he found.

For the first time, individual genes have been identified that may influence how sexual orientation develops in boys and men, both in the womb and during life. Alan Sanders at North Shore University, Illinois, and his team pinpointed these genes by comparing DNA from 1077 gay and 1231 straight men. They scanned the men’s entire genomes, looking for single-letter differences in their DNA sequences. This enabled them to home in on two genes whose variants seem to be linked to sexual orientation.

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