A Recurrent De Novo Nonsense Variant in ZSWIM6 Results in Severe Intellectual Disability without Frontonasal or Limb Malformations.
Am J Hum Genet
; 101(6): 995-1005, 2017 Dec 07.
Article
in En
| MEDLINE
| ID: mdl-29198722
ABSTRACT
A recurrent de novo missense variant within the C-terminal Sin3-like domain of ZSWIM6 was previously reported to cause acromelic frontonasal dysostosis (AFND), an autosomal-dominant severe frontonasal and limb malformation syndrome, associated with neurocognitive and motor delay, via a proposed gain-of-function effect. We present detailed phenotypic information on seven unrelated individuals with a recurrent de novo nonsense variant (c.2737C>T [p.Arg913Ter]) in the penultimate exon of ZSWIM6 who have severe-profound intellectual disability and additional central and peripheral nervous system symptoms but an absence of frontonasal or limb malformations. We show that the c.2737C>T variant does not trigger nonsense-mediated decay of the ZSWIM6 mRNA in affected individual-derived cells. This finding supports the existence of a truncated ZSWIM6 protein lacking the Sin3-like domain, which could have a dominant-negative effect. This study builds support for a key role for ZSWIM6 in neuronal development and function, in addition to its putative roles in limb and craniofacial development, and provides a striking example of different variants in the same gene leading to distinct phenotypes.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Neurocognitive Disorders
/
DNA-Binding Proteins
/
Intellectual Disability
Limits:
Humans
Language:
En
Journal:
Am J Hum Genet
Year:
2017
Document type:
Article
Affiliation country:
Australia