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  • Twin boys gay sex

    15.04.2018

    Ngun reported that in studying the genetic material of 47 pairs of identical male twins, he has identified "epigenetic marks" in nine areas of the human genome that are strongly linked to male homosexuality. Ngun and his colleagues looked for patterns of DNA methylation -- the chemical process by which the epigenome is encoded -- to identify the missing factor in partner preference. But the existence of identical twin pairs in which only one is homosexual "conclusively suggest that genes don't explain everything," Bailey added. McCarthy and other experts cautioned that the discovery of epigenomic marks suggestive of homosexuality is a far cry from finding the causes of sexual preference. Researchers working in the young science of epigenetics acknowledge they are unsure just how an individual's epigenome is formed. But the existence of twin pairs in which one is homosexual and the other is not offers strong evidence that something other than DNA alone influences sexual orientation.

    Twin boys gay sex


    New research identifies epigenomic "marks" linked to homosexuality. But experts say the origins of partner preference remain a mystery. Thirty-seven of those twin sets were pairs in which one was homosexual and the other was heterosexual. Ngun's study of twins doesn't reveal how or when a male takes on the epigenomic marks that distinguish him as homosexual. Researchers working in the young science of epigenetics acknowledge they are unsure just how an individual's epigenome is formed. While genes rarely change over a lifetime, the epigenome is constantly changing. Advertisement Their analysis generated a dataset far too large for a team of humans to make sense of. In nine compact regions scattered across the genome, they found patterns of epigenomic differences that would allow a prediction far more accurate than a random guess of an individual's sexual orientation, Ngun reported Thursday. But experts said the results -- as yet unpublished in a peer-reviewed journal -- offer preliminary new evidence that a man's genetic inheritance is only one influence on his sexual orientation. In 10 of the pairs studied, both twins identified as homosexual. Over a person's lifetime, myriad environmental factors -- nutrition, poverty, a mother's love, education, exposure to toxic chemicals -- all help shape the person he will become. In identical twins, DNA is shared and overlaps perfectly. By Melissa Healy Oct 08, While Ngun's research needs to be replicated in larger studies of twins, it advances the fitful process of better understanding how — and when — a boy's sexual orientation develops, Bailey said. McCarthy, who was not involved in the current study. The distinctive epigenomic marks observed by Ngun and his colleagues could result from some other biological or lifestyle factor common to homosexual men but unrelated to their sexuality, said University of Utah geneticist Christopher Gregg. A set of chemical marks that lies between the genes, the epigenome changes the function of genetic material, turning the human body's roughly 20, protein-coding genes on or off in response to the needs of the moment. But the existence of identical twin pairs in which only one is homosexual "conclusively suggest that genes don't explain everything," Bailey added. McCarthy and other experts cautioned that the discovery of epigenomic marks suggestive of homosexuality is a far cry from finding the causes of sexual preference. Through the epigenome, the results suggest, some facet of life experience likely also primes a man for same-sex attraction. They could correlate with homosexuality but have nothing to do with it. Geneticists suggest that together, the human genome and its epigenome reflect the interaction of nature and nurture -- both our fixed inheritance and our bodies' flexible responses to the world -- in making us who we are. Ngun reported that in studying the genetic material of 47 pairs of identical male twins, he has identified "epigenetic marks" in nine areas of the human genome that are strongly linked to male homosexuality. Many researchers believe that a person's eventual sexual preferences are shaped in the uterus , by hormonal shifts during key stages of fetal brain development. So they unleashed a machine learning algorithm on the data to search for regularities that distinguished the epigenomes of homosexual twin-pairs from twins in which only one was homosexual.

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    4 Comments on “Twin boys gay sex”

    • Kazrall

      Ngun and his colleagues looked for patterns of DNA methylation -- the chemical process by which the epigenome is encoded -- to identify the missing factor in partner preference.

    • Digar

      But experts said the results -- as yet unpublished in a peer-reviewed journal -- offer preliminary new evidence that a man's genetic inheritance is only one influence on his sexual orientation. McCarthy, who was not involved in the current study.

    • Mezijas

      Ngun's study of twins doesn't reveal how or when a male takes on the epigenomic marks that distinguish him as homosexual.

    • Malajora

      The distinctive epigenomic marks observed by Ngun and his colleagues could result from some other biological or lifestyle factor common to homosexual men but unrelated to their sexuality, said University of Utah geneticist Christopher Gregg. Through the epigenome, the results suggest, some facet of life experience likely also primes a man for same-sex attraction.

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