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. 1995 Apr 7;268(5207):98-100.
doi: 10.1126/science.7701349.

A constitutively active mutant PTH-PTHrP receptor in Jansen-type metaphyseal chondrodysplasia

E Schipani  1 , K Kruse, H Jüppner
Affiliations

A constitutively active mutant PTH-PTHrP receptor in Jansen-type metaphyseal chondrodysplasia

E Schipani et al. Science. .

Abstract

A single heterozygous nucleotide exchange in exon M2 of the gene encoding the parathyroid hormone-parathyroid hormone-related peptide (PTH-PTHrP) receptor was identified in a patient with Jansen-type metaphyseal chondrodysplasia, which changes a strictly conserved histidine residue at position 223 in the receptor's first intracellular loop to arginine. Constitutive, ligand-independent adenosine 3',5'-monophosphate accumulation was observed in COS-7 cells expressing the mutant PTH-PTHrP receptor but not in cells expressing the wild-type receptor. This finding explains the severe ligand-independent hypercalcemia and hypophosphatemia, and most likely the abnormal formation of endochondral bone, in this rare form of short-limbed dwarfism.

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