Study of gay brothers seeking genetic clues

By Lindsey Tanner
The Associated Press
Article Last Updated: 10/16/2007 12:28:20 AM MDT

CHICAGO — Julio and Mauricio Cabrera are gay brothers who are convinced their sexual orientation is as deeply rooted as their Mexican ancestry.

They are among 1,000 pairs of gay brothers taking part in the largest study to date seeking genes that may influence whether people are gay. The Cabreras hope the findings will help silence critics who say homosexuality is an immoral choice.

If fresh evidence is found suggesting genes are involved, perhaps homosexuality will be viewed as no different than other genetic traits like height and hair color, said Julio, a student at DePaul University here.

Adds his brother: "I think it would help a lot of folks understand us better."

The federally funded study, led by Chicago-area researchers, will rely on blood or saliva samples to help scientists search for genetic clues to the origins of homosexuality. Parents and straight brothers also are being recruited.

While initial results aren't expected until next year, skeptics are already attacking the methods and disputing the presumed results.

Previous studies have shown that sexual orientation tends to cluster in families, though that doesn't prove genetics is involved. Extended families may share similar child-rearing practices, religion and other beliefs that could also influence sexual orientation.

Dr. Alan Sanders of Evanston Northwestern Healthcare Research Institute, the lead researcher of the new study, said he suspects there isn't one so-called gay gene. It is more likely there are several genes that interact with nongenetic factors, including psychological and social influences, to determine sexual orientation, said Sanders, a psychiatrist.

Many gays fear that if gay genes are identified, it could result in discrimination, prenatal testing and even abortions to eliminate homosexuals, said Joel Ginsberg of the Gay and Lesbian Medical Association.

However, he added, "If we confirm that sexual orientation is an immutable characteristic, we are much more likely to get the courts to rule against discrimination."

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