Exome sequencing in severe non-syndromic specific learning and language disorders in a French cohort.
Eléonore Viora-Dupont, Julian Delanne, Aurore Garde and 29 others
PMID 41168819WHAT IT FOUND
Exome sequencing found a genetic diagnosis in 11 of 82 children with severe learning disorders.
It also flagged 38 uncertain variants. No patient profile predicted who would get a diagnosis, and the study was too small to confirm if sequencing beats standard chromosome testing.
Key findings
01Exome sequencing identified a pathogenic or likely pathogenic variant in 11 of the 82 patients.
02None of the patient characteristics tested, such as the type of learning disorder or presence of ADHD, significantly predicted who received a genetic diagnosis.
03In the subgroup of patients who had not had prior genetic testing, exome sequencing yielded a positive result in 7 of 47 patients, compared to 4 of 47 with chromosomal microarray, a difference that was not statistically significant.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTsWhat it means for SLPs
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What it does not show
The study was small (82 patients), which limited its statistical power. This is why the authors could not confirm if exome sequencing is better than standard chromosome testing, despite seeing a trend. Recruitment bias was present because some patients had already had negative genetic tests, while others had not, creating uneven groups. The clinical definition of 'severe' learning disorder was based on schooling impact and care needs, which may not match every clinic's threshold for referral. Many results were 'variants of uncertain significance,' meaning the test found a change but did not know if it caused the disorder.
Declared interests
The study was supported by the European Regional Development Fund. The text does not declare other conflicts of interest or commercial funding.
The easy way to misread this
Do not assume exome sequencing is superior to chromosomal microarray for learning disorders based on this paper. The difference in diagnostic yield (15% vs 8.5%) was not statistically significant because the study was too small to prove it.
Summarised by AI from the full paper, without a clinician reviewing it. Check it against the source before it changes what you do. Read it on PubMed →