Neuropsychiatric Functioning in CDLS: A Detailed Phenotype and Genotype Correlation.

Ajmone et al. (2022) looked at 38 people with Cornelia de Lange syndrome. They wanted to see how gene changes shape behavior and learning.

They split the group by NIPBL gene type. One group had a full gene break. The other had milder changes.

About 4 in 10 met autism cut-offs. Most had normal IQ but low daily-living scores.

People with a broken NIPBL gene had worse talking skills and higher autism odds.

NMStagnone et al. (2025) studied 30 rare gene types. They also saw high autism rates across every gene. This backs the CdLS numbers.

Andrews et al. (2024) tracked adults with CHD2 changes. Like CdLS, most had autism plus seizures. Both papers say: check for autism in any rare gene syndrome.

Ingersoll et al. (2013) split 22q11 kids by behavior, not gene type. CdLS shows gene first, behavior second. Together they tell you to look both ways.

If you test a child with CdLS, plan for autism even when IQ looks okay. Ask parents about daily skills, not school scores. When the gene report says "NIPBL truncating," start speech and social goals early. Use the same rule for any rare gene change: screen for autism every time.