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Science 16 July 1993:
Vol. 261. no. 5119, pp. 321 - 327
DOI: 10.1126/science.8332896
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Articles

Science, Vol 261, Issue 5119, 321-327
Copyright © 1993 by American Association for the Advancement of Science

articles

A linkage between DNA markers on the X chromosome and male sexual orientation

DH Hamer, S Hu, VL Magnuson, N Hu, and AM Pattatucci

Laboratory of Biochemistry, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892.

The role of genetics in male sexual orientation was investigated by pedigree and linkage analyses on 114 families of homosexual men. Increased rates of same-sex orientation were found in the maternal uncles and male cousins of these subjects, but not in their fathers or paternal relatives, suggesting the possibility of sex-linked transmission in a portion of the population. DNA linkage analysis of a selected group of 40 families in which there were two gay brothers and no indication of nonmaternal transmission revealed a correlation between homosexual orientation and the inheritance of polymorphic markers on the X chromosome in approximately 64 percent of the sib-pairs tested. The linkage to markers on Xq28, the subtelomeric region of the long arm of the sex chromosome, had a multipoint lod score of 4.0 (P = 10(-5), indicating a statistical confidence level of more than 99 percent that at least one subtype of male sexual orientation is genetically influenced.


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