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Isolated Growth Hormone Deficiency: Analysis of the Growth Hormone (GH)-Releasing Hormone Gene and the GH Gene Cluster

P. MULLIS^*, M. PATEL, P. M. BRICKELL and C. G. D. BROOK

Endocrine Unit, Middlesex Hospital (P.M., C.G.D.B.) London WIN 8AA
The Medical Molecular Biology Unit, Biochemistry Department, University College and Middlesex School of Medicine (M.P., P.M.B.) London W1T6DB, United Kingdom

Address requests for reprints to: Prof. C. G. D. Brook, Middlesex Hospital, Mortimer Street, London, WIN 8AA United Kingdom.

Isolated GH deficiency (IGHD) cannot be distinguished on the grounds of anti-human (h) GH antibodies and stunted growth response to exogenous hGH. DNA analysis was proposed to classify children with IGHD. Genomic DNA was extracted and studied by restriction endonuclease analysis after extraction from the circulating lymphocytes of 53 children with IGHD. These children included 5 pairs of siblings and 5 individuals from 10 families, whose parents (n = 20) and brothers and sisters (n = 5) were also analyzed. Twenty-five adults, including individuals from 3 families of normal height, were studied as controls. No deletion within the hGH gene cluster was identified using a [³²P]hGH cDNA clone as a probe. A compound heterozygosity for a hGH-1 deletion or a mutation have not been found. The allelic frequencies for 5 common restriction fragment length polymorphisms were similar in patients and controls. The distribution and frequency of the distinct haplotypes in the hGH gene family revealed no differences between IGHD (n = 30 chromosomes) and controls (n = 48 chromosomes).

No deletion or restriction fragment length polymorphisms could be found using a hGH-releasing hormone cDNA clone as a probe in patients or controls.

This large volume of data gathered from a Caucasian population indicates that the great majority of patients with IGHD has no structural abnormalities of the hGH gene cluster, particularly no hGH-1 gene deletion. In addition, they have no gross deletions within the hGH-releasing hormone gene.

^* Supported by the Swiss National Science Foundation.

Supported by the Cancer Research Campaign.

Received May 11, 1989.

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