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Pubmed ID :27939639
Publication Date : //

Mutations in Histone Acetylase Modifier BRPF1 Cause an Autosomal-Dominant Form of Intellectual Disability with Associated Ptosis.

Intellectual disability (ID) is a common neurodevelopmental disorder exhibiting extreme genetic heterogeneity, and more than 500 genes have been implicated in Mendelian forms of ID. We performed exome sequencing in a large family affected by an autosomal-dominant form of mild syndromic ID with ptosis, growth retardation, and hypotonia, and we identified an inherited 2 bp deletion causing a frameshift in BRPF1 (c.1052_1053del) in five affected family members. BRPF1 encodes a protein modifier of two histone acetyltransferases associated with ID: KAT6A (also known as MOZ or MYST3) and KAT6B (MORF or MYST4). The mRNA transcript was not significantly reduced in affected fibroblasts and most likely produces a truncated protein (p.Val351Glyfs8). The protein variant shows an aberrant cellular location, loss of certain protein interactions, and decreased histone H3K23 acetylation. We identified BRPF1 deletions or point mutations in six additional individuals with a similar phenotype. Deletions of the 3p25 region, containing BRPF1 and SETD5, cause a defined ID syndrome where most of the clinical features are attributed to SETD5 deficiency. We compared the clinical symptoms of individuals carrying mutations or small deletions of BRPF1 alone or SETD5 alone with those of individuals with deletions encompassing both BRPF1 and SETD5. We conclude that both genes contribute to the phenotypic severity of 3p25 deletion syndrome but that some specific features, such as ptosis and blepharophimosis, are mostly driven by BRPF1 haploinsufficiency.

Authors : Mattioli Francesca , Schaefer Elise , Magee Alex , Mark Paul , Mancini Grazia M , Dieterich Klaus , Von Allmen Gretchen , Alders Marielle , Coutton Charles , van Slegtenhorst Marjon , Vieville Gaëlle , Engelen Mark , Cobben Jan Maarten , Juusola Jane , Pujol Aurora , Mandel Jean-Louis , Piton Amélie ,

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