For men, new research suggests that clues to sexual orientation may lie not just in the genes, but in the spaces between the DNA, where molecular marks instruct genes when to turn on and off and how strongly to express themselves. 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.
That news, presented at the meeting of the American Society of Human Genetics on Thursday, may leave the genetically uninitiated scratching their heads. But experts said the results -- as yet unpublished in a peer-reviewed journal -- offer preliminary new evidence that a man's genetic inheritance is only one influence on his sexual orientation.
Through the epigenome, the results suggest, some facet of life experience likely also primes a man for same-sex attraction. 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. Researchers working in the young science of epigenetics acknowledge they are unsure just how an individual's epigenome is formed.
But they increasingly suspect it is forged, in part, by the stresses and demands of external influences. 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.
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's study of twins doesn't reveal how or when a male takes on the epigenomic marks that distinguish him as homosexual. 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.
By imprinting themselves on the epigenome, though, environmental influences may powerfully affect how an individual's genes express themselves over the course of his life.
Eight major studies of identical twins in Australia, the U. Whitehead worked for the New Zealand government as a scientific researcher for 24 years, then done in four years working for the United Nations and International Atomic Energy Agency. Most recently, he serves as a consultant to Japanese universities about the effects of radiation exposure.
His PhD is in biochemistry and statistics. Identical twins have the duplicate genes or DNA. They are nurtured in equal prenatal conditions. If homosexuality is caused beside genetics or prenatal conditions and one twin is gay, the co-twin should also be gay. But the studies reveal something else.
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