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Have scientists finally found the 'gay gene'? Major new study of 800 brothers backs claims sexuality is in our genes
Published: 09:22 EST, 17 November 2014 | Updated: 13:49 EST, 17 November 2014
- Results bolster previous evidence pointing to genes on X chromosome
- Study doesn't identify which of hundreds of genes located in either place might be involved
Published: 09:22 EST, 17 November 2014 | Updated: 13:49 EST, 17 November 2014
A large study of gay brothers has reignited the debate over whether a 'gay gene' exists - and adds to evidence that genes influence men's chances of being homosexual.
Some scientists believe several genes might affect sexual orientation.
Researchers who led the new study of nearly 800 gay brothers say their results bolster previous evidence pointing to genes on the X chromosome.
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Julio Cabrera poses in a local park in Chicago. Cabrera and his brother Mauricio, of Fort Worth, Texas, are among almost 800 gay brothers nationwide who donated blood or saliva to help scientists search for genetic clues about the origins of homosexuality. Both are convinced their sexual orientation is as deeply rooted as their Mexican heritage.
WHAT THEY FOUND
The researchers say they found potential links to male homosexuality in a portion of chromosome X and on chromosome 8, based on an analysis of genetic material in blood or saliva samples from participants.
Chromosome X is one of two human sex chromosomes; the other is chromosome Y, present only in men.
The study authors note that animal research suggests a gene located in one region of chromosome X may contribute to some sexual behavior; it's one of the same regions cited in the new study.
They also found evidence of influence from a gene or genes on a different chromosome.
But the study doesn't identify which of hundreds of genes located in either place might be involved.
Smaller studies seeking genetic links to homosexuality have had mixed results.
The new evidence 'is not proof but it's a pretty good indication' that genes on the two chromosomes have some influence over sexual orientation, said Dr. Alan Sanders, the lead author.
Read more: Study of 800 brothers backs claims sexuality is in our genes Daily Mail Online
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