Building on the insight gained from their initial identificationof a mutation in the receptor for parathyroid hormone (PTH)and parathyroid hormonerelated peptide (PTHrP) in a patientwith Jansen's metaphyseal chondrodysplasia,1 Schipani et al.provide further data on genetic abnormalities associated withthe disorder in this issue of the Journal.2 They report thesame mutation in a mother and her daughter and a different mutationin another patient. Two other, less severely affected patientshad no detectable mutations.
The mutations cause the PTHPTHrP receptor to be persistentlyactivated, resulting in a state of hypercalcemia and hypophosphatemiaresembling that in patients . . . [Full Text of this Article]
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