A constitutively active mutant PTH-PTHrP receptor in Jansen-type metaphyseal chondrodysplasia.
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Schipani E, Kruse K, Juppner H
A constitutively active mutant PTH-PTHrP receptor in Jansen-type metaphyseal chondrodysplasia.
Science. 1995 Apr 7;268(5207):98-100.
- PubMed ID
- 7701349 [ View in PubMed]
- 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.