No single gay gene, says largest ever DNA analysis

Washington: Like size or intelligence, sexual attraction isn’t defined by one gene alone, but is instead the result of the complex interplay between multiple regions of the genome and hard to pin environmental factors.

That’s the conclusion of an analysis conducted on half a million DNA profiles as part of a giant study by researchers in Europe and the United States published in the influential Journal Science.

Its authors hope to bury the notion, popularised in the 1990s, of the existence of an all powerful ‘gay gene’ that determines sexuality in the way eye colour is defined.

“We… found that it’s effectively impossible to predict an individual’s sexual behaviour from their genome,” said Ben Neale, a member of MIT and Harvard’s Broad Institute, one of several organisations involved in the work.