title: GNAS1 lesions in pseudohypoparathyroidism Ia and Ic: genotype phenotype relationship and evidence of the maternal transmission of the hormonal resistance.
abstract: We conducted clinical and biological studies including screening for mutations in the gene encoding the alpha subunit of G(s) (GNAS1) in 30 subjects (21 unrelated families) with Albright's hereditary osteodystrophy (AHO), pseudohypoparathyroidism (PHP); and decreased erythrocyte G(s) activity (PHP-Ia; n = 19); AHO and decreased erythrocyte G(s) activity (isolated AHO; n = 10); or AHO, hormonal resistance, and normal erythrocyte G(s) activity (PHP-Ic; n = 1). A heterozygous GNAS1 gene lesion was found in 14 of 17 PHP-Ia index cases (82%), including 11 new mutations and a mutational hot-spot involving codons 189-190 (21%). These lesions lead to a truncated protein in all but three cases with missense mutations R280K, V159M, and D156N. In the patient diagnosed with PHP-Ic, G(s)alpha protein was shortened by just four amino acids, a finding consistent with the conservation of G(s) activity in erythrocytes and the loss of receptor contact. No GNAS1 lesions were found in individuals with isolated AHO that were not relatives to PHP-Ia patients (n = 5). Intrafamilial segregation analyses of the mutated GNAS1 allele in nine PHP-Ia patients established that the mutation had either occurred de novo on the maternal allele (n = 4) or had been transmitted by a mother with a mild phenotype (n = 5). This finding is consistent with an imprinting of GNAS1 playing a role in the clinical phenotype of loss of function mutations and with a functional maternal GNAS1 allele having a predominant role in preventing the hormonal resistance of PHP-Ia.
authors.affiliation: Department of Pediatric Endocrinology, Groupe Hospitalier Cochin-Saint Vincent de Paul, Assisvance Publique-Hôpitaux de Paris, 75014 Paris, France.
authors.forename: Agnès
authors.initials: A
authors.lastname: Linglart
authors.forename: Jean Claude
authors.initials: JC
authors.lastname: Carel
authors.forename: Michèle
authors.initials: M
authors.lastname: Garabédian
authors.forename: Tran
authors.initials: T
authors.lastname: Lé
authors.forename: Eric
authors.initials: E
authors.lastname: Mallet
authors.forename: Marie Laure
authors.initials: ML
authors.lastname: Kottler
mesh_terms: D000293:Adolescent; D000328:Adult; D000483:Alleles; D002648:Child; D002675:Child, Preschool; D005260:Female; D005359:Fibrous Dysplasia, Polyostotic / Q000235:genetics; D019205:GTP-Binding Protein alpha Subunits, Gs / Q000172:deficiency / Q000235:genetics*; D005838:Genotype; D006801:Humans; D006996:Hypocalcemia / Q000235:genetics; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008875:Middle Aged; D009154:Mutation; D010375:Pedigree; D010641:Phenotype; D011547:Pseudohypoparathyroidism / Q000097:blood / Q000235:genetics*
chemical_list: D019205:GTP-Binding Protein alpha Subunits, Gs