Expanding the phenotype of RTTN variations: a new family with primary microcephaly, severe growth failure, brain malformations and dermatitis.

Expanding the phenotype of RTTN variations: a new family with primary microcephaly, severe growth failure, brain malformations and dermatitis.
Clin Genet. 2016 Nov;90(5):445-450
Authors: Grandone A, Torella A, Santoro C, Giugliano T, Del Vecchio Blanco F, Mutarelli M, Cirillo M, Cirillo G, Piluso G, Capristo C, Festa A, Marzuillo P, Miraglia Del Giudice E, Perrone L, Nigro V
Abstract
Primary autosomal recessive microcephaly (MCPH) is a developmental disorder characterized by prenatal onset of abnormal brain growth. MCPH occurs both alone and as part of a broad range of neurodevelopmental syndromes with or without cortical malformations and growth retardation. Here we report a consanguineous Moroccan family with two siblings affected by severe primary microcephaly, failure to thrive, congenital dermatitis and severe developmental delay. Brain magnetic resonance imaging showed lissencephaly of frontal lobes and periventricular heterotopia of the gray matter. We performed both Comparative Genomic Hybridization array and whole exome sequencing (WES) analyses of the kindred. No quantitative defects were detected. However, WES identified a new homozygous missense variation in the penultimate nucleotide of exon 23 of RTTN gene (c.2953A>G;pArg985Gly). cDNA sequencing revealed two abnormal spliced products, one lacking only exon 23 and the other lacking exons 22 and 23 (out-of-frame). RTTN is a protein involved in cilia structure and funct...

Source: Clinical Genetics - October 26, 2016 Category: Genetics & Stem Cells Authors: Grandone A, Torella A, Santoro C, Giugliano T, Del Vecchio Blanco F, Mutarelli M, Cirillo M, Cirillo G, Piluso G, Capristo C, Festa A, Marzuillo P, Miraglia Del Giudice E, Perrone L, Nigro V Tags: Clin Genet Source Type: research