A mendelian form of neural tube defect caused by a de novo null variant in SMARCC1 in an identical twin.

Abstract:

:Neural tube defects (NTDs) are among the most common birth defects in humans and yet their molecular etiology remains poorly understood. NTDs are believed to result from the complex interaction of environmental factors with a multitude of genetic risk factors in a classical multifactorial disease model. Mendelian forms of NTDs in which single variants are sufficient to cause the disease are extremely rare. We report a monozygotic twin with severe NTDs (occipital encephalocele and myelomeningocele) and a shared de novo, likely truncating, variant in SMARCC1. RTPCR analysis suggests the potential null nature of the variant attributed to nonsense-mediated decay. SMARCC1 is extremely constrained in humans and encodes a highly conserved core chromatin remodeler, BAF155. Mice that are heterozygous for a null allele or homozygous for a hypomorphic allele develop severe NTDs in the form of exencephaly. This is the first report of SMARCC1 mutation in humans, and it shows a critical and conserved requirement for intact BAF chromatin remodeling complex in neurulation. Ann Neurol 2018;83:433-436.

journal_name

Ann Neurol

journal_title

Annals of neurology

authors

Al Mutairi F,Alzahrani F,Ababneh F,Kashgari AA,Alkuraya FS

doi

10.1002/ana.25152

subject

Has Abstract

pub_date

2018-02-01 00:00:00

pages

433-436

issue

2

eissn

0364-5134

issn

1531-8249

journal_volume

83

pub_type

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