A de novo variant in the X-linked gene CNKSR2 is associated with seizures and mild intellectual disability in a female patient.

Abstract:

BACKGROUND:Eight different deletions and point variants of the X-chromosomal gene CNKSR2 have been reported in families with males presenting intellectual disability (ID) and epilepsy. Obligate carrier females with a frameshift variant in the N-terminal protein coding part of CNKSR2 or with a deletion of the complete gene are not affected. Only for one C-terminal nonsense variant, two carrier females were mildly affected by seizures without or with mild motor and language delay. METHODS:Exome sequencing was performed in one female child of a Dutch family, presenting seizures, mild ID, facial dysmorphisms, and abnormalities of the extremities. Potential causative variants were validated by Sanger sequencing. X-chromosome-inactivation (XCI) analysis was performed by methylation-sensitive PCR and fragment-length analysis of the androgen-receptor CAG repeat polymorphism. RESULTS:We identified a de novo variant, c.2304G>A (p.(Trp768*)), in the C-terminal protein coding part of the X-chromosomal gene CNKSR2 in a female patient with seizures and mild ID. Sanger sequencing confirmed the presence of this nonsense variant. XCI analysis showed a mild skewing of X inactivation (20:80) in the blood of our patient. Our variant is the second C-terminal-affecting CNKSR2 variant described in neurologically affected females. CONCLUSION:Our results indicate that CNKSR2 nonsense variants in the C-terminal coding part can result in ID with seizures in female variant carriers.

journal_name

Mol Genet Genomic Med

authors

Polla DL,Saunders HR,de Vries BBA,van Bokhoven H,de Brouwer APM

doi

10.1002/mgg3.861

subject

Has Abstract

pub_date

2019-10-01 00:00:00

pages

e00861

issue

10

issn

2324-9269

journal_volume

7

pub_type

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