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Severe testotoxicosis phenotype associated with Asp578-->Tyr mutation of the lutrophin/choriogonadotrophin receptor gene.
  1. J Müller,
  2. B Gondos,
  3. S Kosugi,
  4. T Mori,
  5. A Shenker
  1. Department of Growth and Reproduction, Rigshospitalet, University of Copenhagen, Denmark.


    Testotoxicosis is a form of male precocious puberty caused by heterogeneous activating mutations in the gene for the lutrophin/choriogonadotrophin receptor (LHR). A patient with an unusually early and severe presentation of testotoxicosis, including profound Leydig cell hyperplasia, was found to have a sporadic mutation encoding Asp578-->Tyr. The severe testotoxicosis phenotype appears to be related to the strongly activating nature of the Tyr substitution.

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