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Molecular Medicine

, Volume 14, Issue 5–6, pp 286–292 | Cite as

Unusual Phenotypic Features in a Patient with a Novel Splice Mutation in the GHRHR Gene

  • Latifa Hilal
  • Yassir Hajaji
  • Marie-Pierre Vie-Luton
  • Zeina Ajaltouni
  • Bouchra Benazzouz
  • Maha Chana
  • Adelmajid Chraïbi
  • Abdelkrim Kadiri
  • Serge Amselem
  • Marie-Laure Sobrier
Research Article

Abstract

Isolated growth hormone deficiency (IGHD) may be of genetic origin. One of the few genes involved in that condition encodes the growth hormone releasing hormone receptor (GHRHR) that, through its ligand (GHRH), plays a pivotal role in the GH synthesis and secretion by the pituitary. Our objective is to describe the phenotype of two siblings born to a consanguineous union presenting with short stature (IGHD) and Magnetic Resonance Imaging (MRI) abnormalities, and to identify the molecular basis of this condition. Our main outcome measures were clinical and endocrinological investigations, MRI of the pituitary region, study of the GHRHR gene sequence and transcripts. In both patients, the severe growth retardation (-5SD) was combined with anterior pituitary hypoplasia. In addition to these classical phenotypic features for IGHD, one of the patients had a Chiari I malformation, an arachnoid cyst, and a dysmorphic anterior pituitary. A homozygous sequence variation in the consensus donor splice site of intron 1 (IVS1 + 2T > G) of the GHRHR gene was identified in both patients. Using in vitro transcription assay, we showed that this mutation results in abnormal splicing of GHRHR transcripts. In this report, which broadens the phenotype associated with GHRHR defects, we discuss the possible role of the GHRHR in the proper development of extrapituitary structures, through a mechanism that could be direct or secondary to severe GH deficiency.

Notes

Acknowledgments

We are grateful to the members of the family for their participation in this study. This work was supported by the Moroccan-French Convention CNRST/INSERM 2005–2006 and 2007–2008; the Assistance Publique-Hôpitaux de Marseille, Programme Hospitalier de Recherche Clinique (AP-HM n°2003–25, convention 20040080) and the Bonus Qualité Recherche from University Paris 6.

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Copyright information

© Feinstein Institute for Medical Research 2008

Authors and Affiliations

  • Latifa Hilal
    • 1
  • Yassir Hajaji
    • 1
  • Marie-Pierre Vie-Luton
    • 2
  • Zeina Ajaltouni
    • 2
  • Bouchra Benazzouz
    • 1
  • Maha Chana
    • 3
  • Adelmajid Chraïbi
    • 3
  • Abdelkrim Kadiri
    • 3
  • Serge Amselem
    • 2
  • Marie-Laure Sobrier
    • 2
  1. 1.Laboratoire de Génétique et de Physiologie Neuroendocrinienne, Equipe des Bases Moléculaires de Maladies Génétiques, UFR de Génétique et Biologie MoléculaireUniversité Ibn Tofaïl, Faculté des SciencesKenitraMaroc
  2. 2.Inserm U654Université Pierre et Marie Curie-Paris 6, Hôpital Armand-TrousseauParisFrance
  3. 3.Service d’Endocrinologie, Diabétologie et NutritionCHU Ibn SinaRabatMaroc

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