Origins of the fragile X syndrome mutation.

Abstract excerpt

The fragile X syndrome is a common cause of mental impairment. In view of the low reproductive fitness of affected males, the high incidence of the syndrome has been suggested to be the result of a high rate of new mutations occurring exclusively in the male germline. Extensive family studies, however, have failed to identify any cases of a new mutation. Alternatively, it has been suggested that a selective...

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