1. Contribution of functionally assessed GHRHR mutations to idiopathic isolated growth hormone deficiency in patients without GH1 mutations
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Merih Berberoğlu, Régis Coutant, Şenay Savaş Erdeve, Cécile Brachet, Caroline Thalassinos, Frédéric Brioude, Michel Polak, Erdal Kurnaz, Sabrina Belkacem, Claudine Heinrichs, Aude Soleyan, Zeynep Şıklar, Nathalie Collot, Philippe Chanson, Jean-Claude Carel, Zehra Aycan, Marie-Laure Sobrier, Serge Amselem, Géraldine Viot, Noureddine Kaffel, Stanislas Lyonnet, Philippe Duquesnoy, Eliane Khallouf, Marie Legendre, Enzo Cohen, Soumeya Fedala, Sophie Rose, Florence Dastot, Frédérique Gatelais, Maladies génétiques d'expression pédiatrique [CHU Trousseau] (Inserm U933), Institut National de la Santé et de la Recherche Médicale (INSERM)-CHU Trousseau [APHP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Hôpital Lamine Debaghine [Alger, Algérie] (HLD), Centre Hospitalier Universitaire Bab El Oued [Alger, Algérie] (CHU Bab El Oued), UF de Génétique moléculaire [CHU Trousseau], CHU Trousseau [APHP], Hôtel-Dieu de France (HDF), Université Saint-Joseph de Beyrouth (USJ), CHU Necker - Enfants Malades [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Hôpitaux Universitaires Paris Centre (CHU Paris Centre), Hôpital Robert Debré, AP-HP Hôpital Bicêtre (Le Kremlin-Bicêtre), Signalisation Hormonale, Physiopathologie Endocrinienne et Métabolique, Université Paris-Sud - Paris 11 (UP11)-Institut National de la Santé et de la Recherche Médicale (INSERM)-AP-HP Hôpital Bicêtre (Le Kremlin-Bicêtre), Centre Hospitalier Universitaire d'Angers (CHU Angers), PRES Université Nantes Angers Le Mans (UNAM), Hôpital Universitaire des Enfants Reine Fabiola [Brussels, Belgium]. (HUERF), Complexe Médical Multidisciplinaire [Sfax, Tunisia] (C2M), Ankara University School of Medicine [Turkey], Imagine - Institut des maladies génétiques (IHU) (Imagine - U1163), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Paris Cité (UPCité), Université Paris Descartes - Paris 5 (UPD5), Université Sorbonne Paris Cité (USPC), Dupuis, Christine, Institut Cochin (IC UM3 (UMR 8104 / U1016)), Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Physiopathologie des maladies génétiques d'expression pédiatrique, Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Pierre et Marie Curie - Paris 6 (UPMC), Centre de Recherche Saint-Antoine (CR Saint-Antoine), Sorbonne Université (SU)-Institut National de la Santé et de la Recherche Médicale (INSERM)-CHU Saint-Antoine [AP-HP], Service de Génétique [Cochin], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Hôpital Cochin [AP-HP], AP-HP Hôpital universitaire Robert-Debré [Paris], Hôpital Universitaire des Enfants Reine Fabiola, Université libre de Bruxelles (ULB), Physiopathologie Cardiovasculaire et Mitochondriale (MITOVASC), Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université d'Angers (UA), Division of Paediatric Endocrinology, Dr Sami Ulus Woman Health, Children Research Hospital, Service de Génétique Médicale [CHU Necker], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-CHU Necker - Enfants Malades [AP-HP], Imagine - Institut des maladies génétiques (IMAGINE - U1163), Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM), Children's University Hospital Queen Fabiola [Bruxelles, Belgium], Physiopathologie des maladies génétiques d'expression pédiatrique (UMRS_933), and Sorbonne Université (SU)-Institut National de la Santé et de la Recherche Médicale (INSERM)
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Male ,Receptors, Neuropeptide ,[SDV]Life Sciences [q-bio] ,DNA Mutational Analysis ,MESH: Amino Acid Sequence ,medicine.disease_cause ,molecular epidemiology ,MESH: Genotype ,Exon ,Receptors, Pituitary Hormone-Regulating Hormone ,Cyclic AMP ,IGHD ,MESH: Human Growth Hormone ,Missense mutation ,MESH: DNA Mutational Analysis ,Idiopathic Isolated Growth Hormone Deficiency ,Genetics (clinical) ,genotype‐phenotype correlation ,MESH: Cyclic AMP ,MESH: Genetic Association Studies ,Genetics ,0303 health sciences ,Mutation ,Human Growth Hormone ,MESH: Receptors, Neuropeptide ,030305 genetics & heredity ,MESH: Genetic Predisposition to Disease ,MESH: Amino Acid Substitution ,Pedigree ,3. Good health ,[SDV] Life Sciences [q-bio] ,functional studies ,Female ,MESH: Mutation ,Genotype ,MESH: Pedigree ,Genetic counseling ,GHRHR ,Biology ,genotype-phenotype correlation ,MESH: Dwarfism, Pituitary ,03 medical and health sciences ,medicine ,Humans ,Genetic Predisposition to Disease ,Amino Acid Sequence ,Dwarfism, Pituitary ,Gene ,Alleles ,Genetic Association Studies ,030304 developmental biology ,MESH: Humans ,Molecular epidemiology ,MESH: Receptors, Pituitary Hormone-Regulating Hormone ,MESH: Alleles ,MESH: Male ,Amino Acid Substitution ,MESH: Female - Abstract
International audience; Isolated growth hormone deficiency (IGHD) is a rare condition mainly caused by mutations in GH1. The aim of this study was to assess the contribution of GHRHR mutations to IGHD in an unusually large group of patients. All GHRHR coding exons and flanking intronic regions were sequenced in 312 unrelated patients with nonsyndromic IGHD. Functional consequences of all newly identified missense variants were assessed in vitro (i.e., study of the expression of recombinant GHRHRs and their ability to activate the cyclic adenosine monophosphate (cAMP) signaling pathway). Genotype-phenotype correlation analyses were performed according to the nature of the identified mutation. We identified 20 different disease-causing GHRHR mutations (truncating and missense loss-of-function mutations), among which 15 are novel, in 24 unrelated patients. Of note, about half (13/24) of those patients represent sporadic cases. The clinical phenotype of patients with at least one missense GHRHR mutation was found to be indistinguishable from that of patients with bi-allelic truncating mutations. This study, which unveils disease-causing GHRHR mutations in 8% (24/312) of IGHD cases, identifies GHRHR as the second IGHD gene most frequently involved after GH1. The finding that 8% of IGHD cases without GH1 mutations are explained by GHRHR molecular defects (including missense mutations), together with the high proportion of sporadic cases among those patients, has important implications for genetic counseling.
- Published
- 2019
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