14 mayo 2015
Some cases of male infertility are due to mutations in the maternal X chromosome that prevent development of viable sperm, according to a study. Nearly half of cases of male infertility not due to a physical obstruction are estimated to have genetic roots, and about 20 percent of infertile men have azoospermia, meaning they don’t make sperm. The only causes for infertility that have been identified are defects of sex chromosomes, such as the deletions of the Y (male) chromosome or duplication of the entire X (female) chromosome in Klinefelter syndrome.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/dGweuYt2AUw/150513210748.htm
