The landscape of copy number variations in Finnish families with autism spectrum disorders.
Finnish families with autism carry rare large DNA changes that spotlight calcium and receptor pathways, and later studies show these same changes often bring social, behavioral, and sensory challenges.
01Research in Context
What this study did
Scientists mapped large chunks of missing or extra DNA in Finnish families who have autism.
They looked at the whole genome, not just one gene.
The goal was to find new genetic clues that other countries might miss.
What they found
Families carried rare big DNA changes that disrupt calcium and brain-receptor pathways.
Several of these changes had never been linked to autism before.
The paper only reports the genetic list; it does not give behavior scores.
How this fits with other research
de Leeuw et al. (2024) zooms in on one chunk the Finnish team spotted: 16p11.2. They show that school-aged carriers have strong social and behavior problems, giving real-life meaning to the DNA finding.
Smith et al. (2022) adds that the same 16p11.2 carriers also have sensory-registration deficits. Together these papers extend the Finnish map into daily clinic issues you can measure.
Green Snyder et al. (2016) tempers the story: only about one in five 16p11.2 duplication carriers actually meet ASD criteria. So the Finnish signal is important, but outcome risk is wide, not fixed.
Lancioni et al. (2011) tried an older single-gene hunt for CNTN4 and came up empty. The 2016 genome-wide scan now supersedes those small one-gene studies by showing the full rare-CNV landscape.
Why it matters
You may never order a genetic test, but you will teach kids whose autism traces to these same calcium or receptor pathways. Expect variable profiles: some children will look classic ASD, others will show mainly ADHD or sensory issues. When families ask "why," you can say rare DNA changes are part of the picture, yet outcome is not set in stone. Use solid behavioral assessment and plan for both social and sensory targets; the later papers show both domains are often affected.
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02At a glance
03Original abstract
Rare de novo and inherited copy number variations (CNVs) have been implicated in autism spectrum disorder (ASD) risk. However, the genetic underpinnings of ASD remain unknown in more than 80% of cases. Therefore, identification of novel candidate genes and corroboration of known candidate genes may broaden the horizons of determining genetic risk alleles, and subsequent development of diagnostic testing. Here, using genotyping arrays, we characterized the genetic architecture of rare CNVs (<1% frequency) in a Finnish case-control dataset. Unsurprisingly, ASD cases harbored a significant excess of rare, large (>1 Mb) CNVs and rare, exonic CNVs. The exonic rare de novo CNV rate (∼22.5%) seemed higher compared to previous reports. We identified several CNVs in well-known ASD regions including GSTM1-5, DISC1, FHIT, RBFOX1, CHRNA7, 15q11.2, 15q13.2-q13.3, 17q12, and 22q11.21. Additionally, several novel candidate genes (BDKRB1, BDKRB2, AP2M1, SPTA1, PTH1R, CYP2E1, PLCD3, F2RL1, UQCRC2, LILRB3, RPS9, and COL11A2) were identified through gene prioritization. The majority of these genes belong to neuroactive ligand-receptor interaction pathways, and calcium signaling pathways, thus suggesting that a subset of these novel candidate genes may contribute to ASD risk. Furthermore, several metabolic pathways like caffeine metabolism, drug metabolism, retinol metabolism, and calcium-signaling pathway were found to be affected by the rare exonic ASD CNVs. Additionally, biological processes such as bradykinin receptor activity, endoderm formation and development, and oxidoreductase activity were enriched among the rare exonic ASD CNVs. Overall, our findings may add data about new genes and pathways that contribute to the genetic architecture of ASD.
Autism research : official journal of the International Society for Autism Research, 2016 · doi:10.1002/aur.1502