Heterozygosity for a mutation in the growth hormone-releasing hormone receptor gene does not influence adult stature, but affects body composition

Rossana M.C. Pereira, Manuel H. Aguiar-Oliveira, Alessia Sagazio, Carla R.P. Oliveira, Francielle T. Oliveira, Viviane C. Campos, Catarine T. Farias, Tábita A.R. Vicente, Miburge B. Gois, Joselina L.M. Oliveira, Celi Marques-Santos, Ívina E.S. Rocha, José A.S. Barreto-Filho, Roberto Salvatori

Research output: Contribution to journalArticle

Abstract

Context: Biallelic mutations in the GHRH receptor (GHRHR) gene (GHRHR) are a frequent cause of isolated GH deficiency (IGHD). Although heterozygous carriers of these mutations appear normal, we hypothesized that heterozygosity for a GHRHR mutation might be associated with a subclinical phenotype. Methods: We studied members of a large Brazilian kindred with IGHD (Itabaianinha cohort) caused by a homozygous null GHRHR mutation. We compared 76 adult subjects (age, 25-75 yr) heterozygous for the mutation (WT/MT) with 77 sex-matched controls from the same population who are homozygous for the wild-type GHRHR allele (WT/WT). Results: We found no difference in adult height and SD score for serum IGF-I between the two groups. Body weight, body mass index, skin folds, waist and hip circumferences, and lean mass were all reduced in WT/MT subjects. Percentage fat mass and waist/hip ratio were similar in the two groups. Fasting insulin and homeostasis model assessment of insulin resistance were lower in WT/MT. The other biochemical parameters [total and fractionated cholesterol, triglycerides, lipoprotein (a), and C-reactive protein] were not different between the two groups. Conclusions: Heterozygosity for a null GHRHR mutation is not associated with reduction in adult stature or in serum IGF-I but is associated with changes in body composition and possibly an increase in insulin sensitivity. These effects do not seem to be modulated by changes in circulating IGF-I.

Original languageEnglish (US)
Pages (from-to)2353-2357
Number of pages5
JournalJournal of Clinical Endocrinology and Metabolism
Volume92
Issue number6
DOIs
StatePublished - Jun 2007

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Biochemistry
  • Endocrinology
  • Clinical Biochemistry
  • Biochemistry, medical

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    Pereira, R. M. C., Aguiar-Oliveira, M. H., Sagazio, A., Oliveira, C. R. P., Oliveira, F. T., Campos, V. C., Farias, C. T., Vicente, T. A. R., Gois, M. B., Oliveira, J. L. M., Marques-Santos, C., Rocha, Í. E. S., Barreto-Filho, J. A. S., & Salvatori, R. (2007). Heterozygosity for a mutation in the growth hormone-releasing hormone receptor gene does not influence adult stature, but affects body composition. Journal of Clinical Endocrinology and Metabolism, 92(6), 2353-2357. https://doi.org/10.1210/jc.2007-0092