Abstract
Idiopathic pituitary insufficiency (IPI) is diagnosed in 10% of all hypopituitary patients. There are several known and unknown aetiologies within the IPI group. The aim of this study was to investigate an adult IPI population for genetic cause according a screening schedule. From files of 373 GH deficient (GHD) patients on GH replacement 50 cases with IPI were identified. Of the 39 patients that approved to the study, 25 patients were selected for genetic investigation according to phenotype and 14 patients were not further tested, as sporadic isolated GHD (n = 9) and GHD with diabetes insipidus (n = 5) have low probability for a known genetic cause. Genotyping of all coding exons of HESX1, LHX4, PROP1, POU1F1 and GH1 genes were performed according to a diagnostic algorithm based on clinical, hormonal and neuroradiological phenotype. Among the 25 patients, an overall rate of 8% of mutations was found, and a 50% rate in familial cases. Among two sibling pairs, one pair that presented with complete anterior pituitary insufficiency, had a compound heterozygous PROP1 gene mutation (codons 117 and 120: exon 3 p Phe 117 Ile (c349 T>A) and p Arg 120 Cys (c358 C>T)) with a phenotype of very late onset ACTH-insufficiency. In the other sibling pair and in the sporadic cases no mutation was identified. This study suggests that currently known genetic causes are rare in sporadic adult IPI patients, and that systematic genetic screening is not needed in adult-onset sporadic cases of IPI. Conversely, familial cases are highly suspect for genetic causes.
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Acknowledgments
The GENHYPOPIT network for the study of genetic determinants of hypopituitarism, coordinated by TB (thierry.brue@mail.ap-hm.fr), was funded by the Groupement d’Intérêt Scientifique (GIS) Institut des Maladies Rares (GISMR0201) and the Programme Hospitalier de Recherche Clinique (PHRC 25/2003, French Ministry of Health). The present study was supported by the Association pour le Développement des Recherches Biologiques et Médicales au Centre Hospitalier Régional de Marseille (ADEREM). Acknowledgement to the personnel at CEM and to Carina Karlsson and Fredrik Enlund at the Department of Clinical Molecular Pathology at Sahlgrenska University Hospital for the help with preparation of DNA. We also thank Nicole Peyrol and Nadine Pluchino of the Molecular Biology Laboratory for the genetic analysis of transcription factors, Marie Legendre and Serge Amselem from the Department of Clinical and Molecular Genetics, Hôpital Armand Trousseau, Paris for the GH1 gene analysis. Thanks to all participating patients.
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There is no conflict of interest that could be perceived as prejudicing the impartiality of the research reported.
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Nyström, H.F., Saveanu, A., Barbosa, E.J.L. et al. Detection of genetic hypopituitarism in an adult population of idiopathic pituitary insufficiency patients with growth hormone deficiency. Pituitary 14, 208–216 (2011). https://doi.org/10.1007/s11102-010-0278-8
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DOI: https://doi.org/10.1007/s11102-010-0278-8