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Doyard, Mathilde; Bacrot, Séverine; Huber, Céline; Di Rocco, Maja; Goldenberg, Alice; Aglan, Mona S; Brunelle, Perrine; Temtamy, Samia; Michot, Caroline; Otaify, Ghada A; Haudry, Coralie; Castanet, Mireille; Leroux, Julien; Bonnefont, Jean-Paul; Munnich, Arnold; Baujat, Geneviève; Lapunzina, Pablo; Monnot, Sophie; Ruiz-Perez, Victor L; Cormier-Daire, Valérie
Journal of medical genetics, 04/2018, Letnik: 55, Številka: 4Journal Article
Stüve-Wiedemann syndrome (SWS) is characterised by bowing of the lower limbs, respiratory distress and hyperthermia that are often responsible for early death. Survivors develop progressive scoliosis and spontaneous fractures. We previously identified mutations in most SWS cases, but absence of pathogenic changes in five patients led us to perform exome sequencing and to identify homozygosity for a mutation in one case p.Ser205Tyrfs*13. The follow-up of this case supported a final diagnosis of osteogenesis imperfecta (OI), based on vertebral collapses and blue sclerae. This prompted us to screen in 25 OI patients with no known mutations.We identified a homozygous deleterious variant in in two affected sibs with typical OI p.His127Arg. Another homozygous variant, p.Asp231Gly, also classed as deleterious, was detected in a patient with type III OI of consanguineous parents using homozygosity mapping and exome sequencing.FAM46A is a member of the superfamily of nucleotidyltransferase fold proteins but its exact function is presently unknown. Nevertheless, there are lines of evidence pointing to a relevant role of FAM46A in bone development. By RT-PCR analysis, we detected specific expression of in human osteoblasts andinterestingly, a nonsense mutation in has been recently identified in an ENU-derived ( -ethyl- -nitrosourea) mouse model characterised by decreased body length, limb, rib, pelvis, and skull deformities and reduced cortical thickness in long bones. We conclude that mutations are responsible for a severe form of OI with congenital bowing of the lower limbs and suggest screening this gene in unexplained OI forms.
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