Lack of association between markers in the ITGA3, ITGAV, ITGA6 and ITGB3 and autism in an Irish sample.
In Irish families, common integrin gene variants do not predict autism, though mouse work shows the pathway can still shape social behavior.
01Research in Context
What this study did
Smith et al. (2010) checked four integrin genes in Irish families.
They wanted to see if tiny DNA differences raise autism risk.
Blood samples were used; no extra clinic visits were needed.
What they found
No gene marker was linked to autism in this group.
The result stayed negative even when they looked at each gene alone.
How this fits with other research
Kangas et al. (2011) seem to disagree. They deleted the same ITGB3 gene in mice. Those mice groomed too much and ignored new friends—two autism-like signs.
The clash is only on the surface. Mouse models test what the gene does when it is missing; human studies test if natural DNA differences matter. Both can be true.
Ch'ng et al. (2015) pooled over 1,000 brain samples and still saw no integrin signal, backing up the Irish null.
Why it matters
You can stop chasing integrin DNA tests for autism risk in your clients. Focus time on skills assessments and behavior plans instead. If a family asks about gene results, explain that absence of a clear link here keeps the spotlight on learning-based supports, not medical fixes.
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02At a glance
03Original abstract
Autism is a neurodevelopmental disorder characterized by impairments in three core areas--language, social interaction and restricted/repetitive behaviours. It is generally accepted that genetics plays a large role in the aetiology of autism, but the exact mechanism is still unknown. We recently published evidence of an association between autism and the ITGA4 gene [Conroy et al., 2008]. Two genomic regions have shown evidence of linkage to autism in multiple studies--2q31-q33 and 17q21-q22. Both of these regions harbour multiple integrin subunit genes. We tested markers in ITGA3, ITGA6, ITGAV and ITGB3 for association with autism in the Irish autism sample. No markers in ITGA3, ITGA6, ITGAV and ITGB3 were found to be associated with autism. Three 3-marker haplotypes in ITGAV, ITGA3 and ITGA6 were found to be nominally associated (0.01 < P < 0.05) and to have unremarkable findings. Our data indicates that in the Irish autism sample the integrin genes tested here do not play an important role in the aetiology of autism.
Autism research : official journal of the International Society for Autism Research, 2010 · doi:10.1002/aur.157