Mutational analysis of the GNAS1 exons encoding the stimulatory G protein in five patients with pseudohypoparathyroidism type 1a.
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Lim SH, Poh LK, Cowell CT, Tey BH, Loke KY
Mutational analysis of the GNAS1 exons encoding the stimulatory G protein in five patients with pseudohypoparathyroidism type 1a.
J Pediatr Endocrinol Metab. 2002 Mar;15(3):259-68.
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- 11926205 [ View in PubMed]
- Abstract
We analyzed the GNAS1 gene in five patients with pseudohypoparathyroidism type 1a (PHP1a) by performing polymerase chain reaction, followed by sequencing all 13 exons of the gene, single-stranded conformational polymorphism (SSCP) or heteroduplex analysis (HD). Three novel mutations were discovered: (1) a de novo 3 bp insertion of CTG in codon 47 of exon 1; (2) a missense mutation 1103T in exon 4; and (3) a de novo mutation of Arg280Gly in exon 10. Two other mutations, previously described in the literature, include: (1) a de novo 4 bp deletion (deltaGACT) involving codons 189 and 190 in exon 7, and (2) a deletion of a cytosine nucleotide at codon 115 in exon 5. We conclude that mutational analysis of the GNAS1 gene is a strong supportive tool for the diagnosis of PHP1a, and is a useful adjunct to the synthetic parathyroid hormone infusion test for PTH resistance.