Journal of Clinical Endocrinology & Metabolism, Vol 80, 3591-3595, Copyright © 1995 by Endocrine Society

ARTICLES

A recurring dominant negative mutation causes autosomal dominant growth hormone deficiency--a clinical research center study

JD Cogan, B Ramel, M Lehto, J Phillips 3rd, M Prince, RM Blizzard, TJ de Ravel, M Brammert and L Groop
Department of Pediatrics, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-2578, USA.

Familial isolated GH deficiency type II (IGHD-II) is an autosomal dominant disorder that has been previously shown in some patients to be caused by heterogeneous GH gene defects that affect GH messenger RNA (mRNA) splicing. We report here our finding of multiple G-->A transitions of the first base of the donor splice site of IVS 3 (+ 1G-- >A) in IGHD II subjects from three nonrelated kindreds from Sweden, North America, and South Africa. This + 1G-->A substitution creates an NlaIII site that was used to demonstrate that all affected individuals in all three families were heterozygous for the mutation. To determine the effect of this mutation on GH mRNA processing, HeLa cells were transfected with expression plasmids containing normal or mutant + 1G-- >A alleles, and complementary DNAs from the resulting GH mRNAs were sequenced. The mutation was found to destroy the GH IVS 3 donor splice site, causing skipping of exon 3 and loss of the codons for amino acids 32-71 of the mature GH peptide from the mutant GH mRNA. Our finding of exon 3 skipping in transcripts of the + 1G-->A mutant allele is identical to our previous report of a different sixth base transition (+6T-->C) mutation of the IVS 3 donor splice site that also causes IGHD II. Microsatellite analysis of an affected subjects' DNA from each of the three nonrelated kindreds indicates that the + 1G-->A mutation arose independently in each family. Finding that neither grandparent has the mutation in the first family suggests that it arose de novo in that family. Our data indicate that 1) + 1G-->A IVS 3 mutations perturb GH mRNA splicing and cause IGHD II; and 2) these mutations can present as de novo GHD cases.

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