Neurodevelopmental and other phenotypes recurrently associated with heterozygous BAZ2B loss-of-function variants.
Fiche publication
Date publication
octobre 2023
Journal
American journal of medical genetics. Part A
Auteurs
Membres identifiés du Cancéropôle Est :
Dr NAMBOT Sophie
Tous les auteurs :
Sewani S, Azamian MS, Mendelsohn BA, Mau-Them FT, Réda M, Nambot S, Isidor B, van der Smagt JJ, Shen JJ, Shillington A, White L, Elloumi HZ, Baker PR, Svihovec S, Brown K, Koopman-Keemink Y, Hoffer MJV, Lakeman IMM, Brischoux-Boucher E, Kinali M, Zhao X, Lalani SR, Scott DA
Lien Pubmed
Résumé
The bromodomain adjacent to zinc finger 2B (BAZ2B) gene encodes a chromatin remodeling protein that has been shown to perform a variety of regulatory functions. It has been proposed that loss of BAZ2B function is associated with neurodevelopmental phenotypes, and some recurrent structural birth defects and dysmorphic features have been documented among individuals carrying heterozygous loss-of-function BAZ2B variants. However, additional evidence is needed to confirm that these phenotypes are attributable to BAZ2B deficiency. Here, we report 10 unrelated individuals with heterozygous deletions, stop-gain, frameshift, missense, splice junction, indel, and start-loss variants affecting BAZ2B. These included a paternal intragenic deletion and a maternal frameshift variant that were inherited from mildly affected or asymptomatic parents. The analysis of molecular and clinical data from this cohort, and that of individuals previously reported, suggests that BAZ2B haploinsufficiency causes an autosomal dominant neurodevelopmental syndrome that is incompletely penetrant. The phenotypes most commonly seen in association with loss of BAZ2B function include developmental delay, intellectual disability, autism spectrum disorder, speech delay-with some affected individuals being non-verbal-behavioral abnormalities, seizures, vision-related issues, congenital heart defects, poor fetal growth, and an indistinct pattern of dysmorphic features in which epicanthal folds and small ears are particularly common.
Mots clés
BAZ2B, autism spectrum disorder, developmental delay, genetic syndrome, intellectual disability, neurodevelopmental disorder
Référence
Am J Med Genet A. 2023 10 23;: