Subtypes in 22q11.2 deletion syndrome associated with behaviour and neurofacial morphology.
Kids with 22q11DS split into two clear risk profiles—knowing which one guides both school and medical plans.
01Research in Context
What this study did
Ingersoll et al. (2013) looked at 50 youths with 22q11.2 deletion syndrome. They ran a cluster analysis on test scores, behavior checklists, and brain scans.
The goal was to see if these kids fall into clear subtypes instead of one big mixed group.
What they found
Two clusters popped out. Type-1 has big gaps in verbal and thinking skills plus autism-like traits. Type-2 keeps near-normal IQ but shows weaker executive skills like planning and shifting tasks.
The groups also differ in face and brain shape, so the split shows up in both behavior and body.
How this fits with other research
Chou et al. (2010) mapped the same syndrome earlier and found verbal IQ always beats non-verbal IQ. Brooke’s work keeps that pattern but shows it hides two separate risk tracks, not one smooth line.
Sajith et al. (2008) and Cholemkery et al. (2016) used the same cluster trick on autism. They also found subgroups, proving the method works across diagnoses.
McConkey et al. (1999) did a similar split in dual diagnosis adults. Together these papers say: stop treating genetic syndromes as one blob—look for profiles.
Why it matters
If you test a child with 22q11DS, flag the profile early. Type-1 needs intense language and autism supports plus close psychiatric watch. Type-2 benefits from executive-function coaching and may stay in mainstream classes longer. Share the subtype with the medical team so they know who is at higher risk for psychosis later.
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02At a glance
03Original abstract
22q11.2 deletion syndrome (22q11DS) has a complex phenotype with more than 180 characteristics, including cardiac anomalies, cleft palate, intellectual disabilities, a typical facial morphology, and mental health problems. However, the variable phenotype makes it difficult to predict clinical outcome, such as the high prevalence of psychosis among adults with 22q11DS (~25-30% vs. ~1% in the general population). The purpose of this study was to investigate whether subtypes exist among people with 22q11DS, with a similar phenotype and an increased risk of developing mental health problems. Physical, cognitive and behavioural data from 50 children and adolescents with 22q11DS were included in a k-means cluster analysis. Two distinct phenotypes were identified: Type-1 presented with a more severe phenotype including significantly impaired verbal memory, lower intellectual and academic ability, as well as statistically significant reduced total brain volume. In addition, we identified a trend effect for reduced temporal grey matter. Type-1 also presented with autism-spectrum traits, whereas Type-2 could be described as having more 22q11DS-typical face morphology, being predominately affected by executive function deficits, but otherwise being relatively high functioning with regard to cognition and behaviour. The confirmation of well-defined subtypes in 22q11DS can lead to better prognostic information enabling early identification of people with 22q11DS at high risk of psychiatric disorders. The identification of subtypes in a group of people with a relatively homogenous genetic deletion such as 22q11DS is also valuable to understand clinical outcomes.
Research in developmental disabilities, 2013 · doi:10.1016/j.ridd.2012.07.025