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A novel luteinizing hormone receptor mutation in a patient with familial male-limited precocious puberty: effect of the size of a critical amino acid on receptor activity.

Abstract：

:Familial male-limited precocious puberty (FMPP) is a form of luteinizing hormone-releasing hormone (LHRH)-independent isosexual precocious puberty caused by gain-of-function mutations of the luteinizing hormone/chorionic gonadotropin receptor (hLHR). The most common mutation is 1733 A>G, which causes substitution of Asp-578 by Gly. In this study, a male infant presented at the age of 20 months with accelerated sexual development was analyzed for the presence of activating mutations of the hLHR. Analysis of exon 11 of the hLHR gene by genomic polymerase chain reaction (PCR), asymmetric PCR, and dideoxy sequencing identified a single base substitution, 1734 T>A, which led to the replacement of Asp-578 by Glu. The same mutation was found in the mother. Expression of the mutated hLHR in HEK 293 cells demonstrated elevated basal levels of intracellular cAMP in the transfected cells confirming the constitutive activating nature of the mutated hLHR. A possible genotype-phenotype relationship of the hLHR mutations was examined by a comparison of the in vitro activities of the hLHRs carrying the Asp578Gly, Asp578Tyr, Asp578Trp, and Asp578Glu mutations in HEK 293 cells. A positive correlation between the size of the substituting amino acid and the basal level of intracellular cAMP of cells expressing the mutated receptor was demonstrated.

journal_name

Mol Genet Metab

journal_title

Molecular genetics and metabolism

authors

Wu SM,Leschek EW,Brain C,Chan WY

doi

10.1006/mgme.1998.2780

subject

Has Abstract

pub_date

1999-01-01 00:00:00

pages

68-73

issue

1

eissn

1096-7192

issn

1096-7206

pii

S1096-7192(98)92780-9

journal_volume

66

pub_type

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