They identified four such variants on chromosomes seven, 11, 12, and 15, respectively.
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Two variants were specific to men who reported same-sex sexual experience. One, a cluster of DNA on chromosome 15, has previously been found to predict male-pattern baldness. Another variant on chromosome 11 sits in a region rich with olfactory receptors. Ganna noted that olfaction is thought to play a large role in sexual attraction.
A much smaller study, which used a different kind of association technique known as a genetic linkage study, had suggested a stretch of DNA on the X chromosome was linked to inherited homosexuality. In the new GWAS, that stretch was not found to be associated with the reported same-sex behavior.
But the lead author of the earlier study, Dean Hamer, then of the National Institutes of Health in Bethesda, Maryland, praised the new work. The four newly identified genetic variants also were correlated with some mood and mental health disorders.
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Both men and women with the variants were more likely to have experienced major depressive disorder and schizophrenia, and women were more likely to have bipolar disorder. Ganna stressed that these findings should not be taken to mean that the variants cause the disorders. Berlin Gay Restaurants. Berlin Gay Shops. Berlin Gay Gyms.
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