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. 1988 Jan;85(2):617–621. doi: 10.1073/pnas.85.2.617

Genetic deficiency of the alpha subunit of the guanine nucleotide-binding protein Gs as the molecular basis for Albright hereditary osteodystrophy.

M A Levine 1, T G Ahn 1, S F Klupt 1, K D Kaufman 1, P M Smallwood 1, H R Bourne 1, K A Sullivan 1, C Van Dop 1
PMCID: PMC279602  PMID: 2829196

Abstract

Patients who have pseudohypoparathyroidism type I associated with Albright hereditary osteodystrophy commonly have a genetic deficiency of the alpha subunit of the G protein that stimulates adenylyl cyclase (alpha Gs) (ATP pyrophosphate-lyase, EC 4.6.1.1). To discover the molecular mechanism that causes alpha Gs deficiency in these patients, we examined eight kindreds with one or more members affected with Albright hereditary osteodystrophy or pseudohypoparathyroidism and alpha Gs deficiency. In these families, alpha Gs deficiency and the Albright hereditary osteodystrophy phenotype were transmitted together in a dominant inheritance pattern. Using a cDNA hybridization probe for alpha Gs, restriction analysis with several endonucleases showed no abnormalities of restriction fragments or gene dosage. RNA blot and dot blot analysis of total RNA from cultured fibroblasts obtained from the patients revealed approximately equal to 50% reduced mRNA levels for alpha Gs in affected members of six of the pedigrees but normal levels in affected members of the two other pedigrees, compared to mRNA levels in fibroblasts from unaffected individuals. By contrast, mRNA levels encoding the alpha subunit of the G protein that inhibits adenylyl cyclase were not altered. Our findings suggest that several molecular mechanisms produce alpha Gs deficiency in patients with pseudohypoparathyroidism type Ia and that major gene rearrangements or deletions are not a common cause for alpha Gs deficiency in pseudohypoparathyroidism type I.

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Selected References

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