A family of male limited gonadotrophin independent precocious puberty was examined for activating mutation of the LH receptor. A transition of A to G in nucleotide 1733 of the human LH receptor gene was identified in all affected males and in an unaffected carrier female. The mutation was shown by identifying a new restriction site created by the mutation. This mutation appears to be a common feature of the disorder, as it has been reported previously in unrelated families. Therefore, the presence of this new restriction site can serve as a diagnostic tool in males at risk before the onset of symptoms, as well as identifying carrier females.
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