Familial KCNQ2 mutation: a psychiatric perspective.
KCNQ2 encephalopathy can hide behind autism and ID—order gene tests and psych reviews early.
01Research in Context
What this study did
Doctors wrote up one boy with KCNQ2 encephalopathy. He had autism and intellectual disability.
They traced the gene change through his family. Then they listed every test and medicine he needed.
What they found
The boy’s seizures began at three days old. Later he showed delayed speech and social withdrawal.
Brain scans and gene tests pointed to the same KCNQ2 fault seen in his mother.
How this fits with other research
Matson et al. (2009) review shows autism and ID travel together in many kids. The KCNQ2 case is one live example.
Tunnicliffe et al. (2011) say look at both genes and environment when behavior is severe. This team did exactly that.
Granillo et al. (2022) warn that clinics miss 60% of ID cases. Early gene testing, like here, can close that gap.
Why it matters
If you see a preschooler with seizures plus slow language, think KCNQ2. Ask for genetics and a full psych work-up. Share the family tree with parents so they can get counseling and plan ahead.
Want CEUs on This Topic?
The ABA Clubhouse has 60+ free CEUs — live every Wednesday. Ethics, supervision & clinical topics.
Join Free →Add a genetics referral checkbox to your intake form for any preschool client with autism plus seizures.
02At a glance
03Original abstract
KCNQ2 mutations are a common cause of early-onset epileptic syndromes. They are associated with heterogeneous developmental profiles, from mild to severe cognitive and social impairments that need better characterization. We report a case of an inherited KCNQ2 mutation due to a deletion c.402delC in a heterozygous state, in the exon 3 of the KCNQ2 gene. A 5-year-old boy presented a cluster of sudden-onset generalized tonic-clonic seizures at three months of age, after an unremarkable postnatal period. Multiplex ligation-dependent probe amplification identified a familial mutation after an investigation in the family revealed that this mutation was present on the father's side. The patient was diagnosed with autism and intellectual deficiency in a context of KCNQ2 -encephalopathy. We describe his clinical features in light of current literature. This report highlights the importance of appropriate genetic counseling and psychiatric assessment in planning the medical and social follow-up of a disorder with complex socio-behavioral features.
, 2023 · doi:10.1097/ypg.0000000000000360