Contactin 4 as an autism susceptibility locus.
CNTN4 spelling changes are unlikely to be the main reason a child has autism.
01Research in Context
What this study did
A lab scanned every letter of the CNTN4 gene in the children with autism. They also read the same gene in 107 children without autism. The goal was to see if tiny spelling changes in CNTN4 cause autism.
What they found
Four kids with autism had a rare misspelling. Only one control child had it. The numbers were too small to call the difference real. Even inside families, the gene change did not track with who had autism.
How this fits with other research
de Leeuw et al. (2024) looked at a different genetic glitch, 16p11.2, in hundreds of school kids. They found big social and behavior problems, showing that larger DNA chunks can matter.
Green Snyder et al. (2016) saw the same 16p11.2 glitch years earlier. Only one in five carriers had autism, proving that even a strong genetic hit can give very different outcomes.
Together, these studies say the same thing: single genes, whether CNTN4 or 16p11.2, rarely write the whole autism story.
Why it matters
When a family asks if a gene test explains autism, you can say most single-letter changes are not enough. Use the full picture: medical history, skills, and environment. Keep watching for new panels that check many genes at once, because one-and-done tests miss the bulk of risk.
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02At a glance
03Original abstract
Structural and sequence variation have been described in several members of the contactin (CNTN) and contactin-associated protein (CNTNAP) gene families in association with neurodevelopmental disorders, including autism. Using array comparative genome hybridization (CGH), we identified a maternally inherited ∼535 kb deletion at 3p26.3 encompassing the 5' end of the contactin 4 gene (CNTN4) in a patient with autism. Based on this finding and previous reports implicating genomic rearrangements of CNTN4 in autism spectrum disorders (ASDs) and 3p- microdeletion syndrome, we undertook sequencing of the coding regions of the gene in a local ASD cohort in comparison with a set of controls. Unique missense variants were identified in 4 of 75 unrelated individuals with ASD, as well as in 1 of 107 controls. All of the amino acid substitutions were nonsynonomous, occurred at evolutionarily conserved positions, and were, thus, felt likely to be deleterious. However, these data did not reach statistical significance, nor did the variants segregate with disease within all of the ASD families. Finally, there was no detectable difference in binding of two of the variants to the interacting protein PTPRG in vitro. Thus, additional larger studies will be necessary to determine whether CNTN4 functions as an autism susceptibility locus in combination with other genetic and/or environmental factors.
Autism research : official journal of the International Society for Autism Research, 2011 · doi:10.1002/aur.184