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Journal of Clinical Endocrinology & Metabolism, Vol 80, 1611-1621, Copyright © 1995 by Endocrine Society
ARTICLES |
E Schipani, LS Weinstein, C Bergwitz, A Iida-Klein, XF Kong, M Stuhrmann, K Kruse, MP Whyte, T Murray and J Schmidtke
Endocrine Unit, Massachusetts General Hospital, Boston 02114, USA.
Pseudohypoparathyroidism type Ib (PHP-Ib) is thought to be caused by a PTH/PTH-related peptide (PTHrP) receptor defect. To search for receptor mutations in genomic DNA from 17 PHP-Ib patients, three recently isolated human genomic DNA clones were further characterized by restriction enzyme mapping and nucleotide sequencing across intron/exon borders. Regions including all 14 coding exons and their splice junctions were amplified by polymerase chain reaction, and the products were analyzed by either temperature gradient gel electrophoresis or direct nucleotide sequencing. Silent polymorphisms were identified in exons G (1 of 17), M4 (1 of 17), and M7 (15 of 17). Two base changes were found in introns, 1 at the splice-donor site of the intron between exons E2 and E3 (1 of 17) and the other between exons G and M1 (2 of 17). Total ribonucleic acid from COS-7 cells expressing minigenes with or without the base change between exons E2 and E3 showed no difference by either Northern blot analysis or reverse transcriptase-polymerase chain reaction. Radioligand binding was indistinguishable for both transiently expressed constructs. A missense mutation (E546 to K546) in the receptor's cytoplasmic tail (3 of 17) was also found in 1 of 60 healthy individuals, and PTH/PTHrP receptors with this mutation were functionally indistinguishable from wild-type receptors. PHP-Ib thus appears to be rarely, if ever, caused by mutations in the coding exons of the PTH/PTHrP receptor gene.
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