Autism Spectrum Disorder, Developmental and Psychiatric Features in 16p11.2 Duplication.
Only one in five 16p11.2 duplication carriers have autism, yet later school-age social and behavior issues remain common.
01Research in Context
What this study did
Green Snyder et al. (2016) looked at 25 people who carry an extra copy of 16p11.2.
They asked: how many have autism, ADHD, anxiety, or low IQ?
Doctors gave full autism tests and IQ tests to each person.
What they found
Only 1 in 5 carriers met the cut-off for autism.
Most did not show the classic social-communication signs of ASD.
IQ ranged from very low to normal, showing wide scatter.
How this fits with other research
de Leeuw et al. (2024) later tested 52 school-aged carriers and saw more trouble.
They found high rates of social-communication problems and big externalizing behaviors.
The two studies do not clash: LeeAnne counted who met full ASD criteria, while J scored everyday social skills on a scale.
Fahmie et al. (2013) showed that odd sensory interests mark severe ASD; LeeAnne’s group lacked these clear signs, helping explain why their autism rate stayed low.
Why it matters
Tell families that a 16p11.2 duplication means wide uncertainty.
Only 20 % will have autism, but watch for language, attention, and behavior needs that can still surface at school age.
Plan re-checks instead of one-time labels.
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02At a glance
03Original abstract
The 16p11.2 duplication (BP4-BP5) is associated with Autism Spectrum Disorder (ASD), although significant heterogeneity exists. Quantitative ASD, behavioral and neuropsychological measures and DSM-IV diagnoses in child and adult carriers were compared with familial non-carrier controls, and to published results from deletion carriers. The 16p11.2 duplication phenotype ranges widely from asymptomatic presentation to significant disability. The most common diagnoses were intellectual disability, motor delays and Attention Deficit Hyperactivity Disorder in children, and anxiety in adults. ASD occurred in nearly 20 % of child cases, but a majority of carriers did not show the unique social features of ASD. The 16p11.2 duplication phenotype is characterized by wider variability than the reciprocal deletion, likely reflecting contributions from additional risk factors.
Journal of autism and developmental disorders, 2016 · doi:10.1007/s10803-016-2807-4