Autism spectrum and obsessive-compulsive disorders: OC behaviors, phenotypes and genetics.
Obsessive-compulsive behaviors in autism are genetically tangled and need sharper measurement before drugs or large CBT trials can succeed.
01Research in Context
What this study did
Suma and colleagues wrote a narrative review. They asked: what do we know about obsessive-compulsive behaviors in autism?
They looked at genetics, brain, and behavior papers. Their goal was to map clearer sub-types before testing drugs or therapy.
What they found
The authors say current labels are too broad. They argue we need finer behavior groups that also match gene patterns.
Without these sharper groups, new medicines or CBT may miss the mark.
How this fits with other research
Zandt et al. (2009) ran a direct comparison the same year. They measured executive function in kids with ASD and kids with OCD. They found only tiny, scattered links between EF and repetitive acts. Their data echo Suma’s point: surface behaviors alone don’t split the two groups cleanly.
Lefebvre et al. (2021) pushed the idea into families. They showed parents and siblings of ASD and OCD probands look almost alike on repetitive behavior scales. This supports Suma’s call for genetics-first, not diagnosis-first, grouping.
Van Hees et al. (2018) zoomed in on one phenotype: hoarding. They found one in three autistic children with anxiety or OCD traits shows moderate to severe hoarding. This gives clinicians a concrete, measurable slice of the broader OCB pie Suma wants to carve up.
Why it matters
For you as a BCBA, the paper is a measuring reminder. If a client lines toys, hoards papers, or checks locks, note each topography, frequency, and trigger. Share these details with the medical team; they feed future genetic and drug studies. Meanwhile, shape treatment goals around the smallest, clearest behavior units instead of the wide OCD label.
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02At a glance
03Original abstract
Autism spectrum disorders (ASDs) are a phenotypically and etiologically heterogeneous set of disorders that include obsessive-compulsive behaviors (OCB) that partially overlap with symptoms associated with obsessive-compulsive disorder (OCD). The OCB seen in ASD vary depending on the individual's mental and chronological age as well as the etiology of their ASD. Although progress has been made in the measurement of the OCB associated with ASD, more work is needed including the potential identification of heritable endophenotypes. Likewise, important progress toward the understanding of genetic influences in ASD has been made by greater refinement of relevant phenotypes using a broad range of study designs, including twin and family-genetic studies, parametric and nonparametric linkage analyses, as well as candidate gene studies and the study of rare genetic variants. These genetic analyses could lead to the refinement of the OCB phenotypes as larger samples are studied and specific associations are replicated. Like ASD, OCB are likely to prove to be multidimensional and polygenic. Some of the vulnerability genes may prove to be generalist genes influencing the phenotypic expression of both ASD and OCD while others will be specific to subcomponents of the ASD phenotype. In order to discover molecular and genetic mechanisms, collaborative approaches need to generate shared samples, resources, novel genomic technologies, as well as more refined phenotypes and innovative statistical approaches. There is a growing need to identify the range of molecular pathways involved in OCB related to ASD in order to develop novel treatment interventions.
Autism research : official journal of the International Society for Autism Research, 2009 · doi:10.1002/aur.108