The autism spectrum phenotype in ADNP syndrome.
In ADNP syndrome, expect sharp body stereotypies, deep cognitive delay, and social gaps that shrink when speech emerges.
01Research in Context
What this study did
The team looked at kids who have ADNP syndrome. This is a rare genetic change that often comes with autism and intellectual disability.
They compared these kids to other children with autism. The goal was to see if ADNP autism looks different from regular autism.
What they found
Kids with ADNP had very low IQ scores. Yet their social struggles were milder than expected.
Hand flapping, rocking, and other repeated body moves were common and intense. The milder social issues only showed up when the child had some words.
How this fits with other research
Green Snyder et al. (2016) saw the opposite pattern in 16p11.2 duplication. Only one in five of those kids had autism, and their social traits were not clear. ADNP seems to give a stronger, more defined autism picture.
de Leeuw et al. (2024) also studied 16p11.2 and found high social-communication problems. Both papers agree that genetic syndromes can mimic autism, but ADNP gives a tighter match.
Barton et al. (2019) showed that sensory hypersensitivity drives repetitive moves in all kids. The big motor stereotypies seen in ADNP may share this sensory root.
Why it matters
If you test a child with ADNP, expect severe cognitive delay plus clear motor stereotypies. Do not over-score social items if the child is non-verbal; the social gap may look small simply because language is absent. Target intense sensory-based stereotypies first, then build communication.
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02At a glance
03Original abstract
Pathogenic disruptions to the activity-dependent neuroprotector homeobox (ADNP) gene are among the most common heterozygous genetic mutations associated with autism spectrum disorders (ASDs). Individuals with ADNP disruptions share a constellation of medical and psychiatric features, including ASD, intellectual disability (ID), dysmorphic features, and hypotonia. However, the profile of ASD symptoms associated with ADNP may differ from that of individuals with another ASD-associated single gene disruption or with ASD without a known genetic cause. The current study examined the ASD phenotype in a sample of representative youth with ADNP disruptions. Participants (N = 116, ages 4-22 years) included a cohort with ADNP mutations (n = 11) and three comparison groups with either a mutation to CHD8 (n = 11), a mutation to another ASD-associated gene (other mutation; n = 53), or ASD with no known genetic etiology (idiopathic ASD; n = 41). As expected, individuals with ADNP disruptions had higher rates of ID but less severe social affect symptoms compared to the CHD8 and Idiopathic ASD groups. In addition, verbal intelligence explained more variance in social impairment in the ADNP group compared to CHD8, other mutation, and idiopathic ASD comparison groups. Restricted and repetitive behaviors in the ADNP group were characterized by high levels of stereotyped motor behaviors, whereas the idiopathic ASD group showed high levels of restricted interests. Taken together, these results underscore the role of ADNP in cognitive functioning and suggest that social impairments in ADNP syndrome are consistent with severity of verbal deficits. Autism Res 2018, 11: 1300-1310. © 2018 International Society for Autism Research, Wiley Periodicals, Inc. LAY SUMMARY: Disruptions to the ADNP gene (i.e., ADNP syndrome) have been associated with autism spectrum disorder (ASD). This article describes intellectual disability, mild social difficulties, and severe repetitive motor movements in a group of 11 youth with ADNP Syndrome. We found lower rates of ASD than previously reported. Verbal skills explained individual variability in social impairment. This pattern suggests that the ADNP gene is primarily associated with learning and memory, and level of social difficulties is consistent with level of verbal impairment.
Autism research : official journal of the International Society for Autism Research, 2018 · doi:10.1002/aur.1980