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The end of the male "species"?From: RModugno@aol.comSat Apr 24 09:59:46 2004
Researchers have created a healthy mouse with the genetic material from the eggs of two female mice and without sperm from a male mouse, representing the first time a mammal has been conceived using a process known as parthenogenesis, according to a study published in the April 22 issue of the journal Nature, the Boston Globe reports (Goldberg, Boston Globe, 4/22). Parthenogenesis -- a type of asexual reproduction by which an unfertilized egg divides into embryo-like parthenotes -- occurs naturally in snakes, birds and insects, but it has never been observed among mammals. In previous studies, researchers successfully created mouse embryos using the process, but the embryos were no longer viable after 10 days of gestation, Long Island Newsday reports (Cooke, Long Island Newsday, 4/22). The new study was able to overcome that problem by taking into account an important aspect of mammals' sexual reproduction known as imprinting, a process in which certain genes in an embryo are deactivated depending on whether they were inherited from the male or female parent (Boston Globe, 4/22). **************************************************************************** Robert Modugno MD MBA FACOG Marietta, GA http://www.novaobgyn.yourmd.com
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