Fungi and animals, including humans, have a lot in common when it comes to the arrangement of genes that determine their sex, according to new work by Howard Hughes Medical Institute geneticists at the Duke University Medical Center.
Regions of the genome that determine the sexual identity of the infectious fungus Cryptococcus neoformans bear striking similarities to the human Y chromosome -- the sex chromosome associated with male characteristics -- the team found. The researchers reported their findings in the December 2004 issue of the Public Library of Science Biology (now available online).
The result suggests that, despite their differences, similar evolutionary processes shaped the chromosomal sex-determining regions in both groups, said HHMI investigator Joseph Heitman, M.D., director of Dukes Center for Microbial Pathogenesis. The fungus might therefore serve as a useful model system for the study of sex chromosome evolution and the genetic changes that can lead to infertility, he said. "The revolution in genome sciences has rapidly accelerated our ability to elucidate the process by which sex chromosomes evolved," Heitman said. "While mechanisms of sex determination are extremely diverse, our study highlights remarkable similarities among them in widely divergent groups."
Kendall Morgan | EurekAlert!
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