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The Number of Genomic Copies at the 16p11.2 Locus Modulates Language, Verbal Memory, and Inhibition
Loyse Hippolyte1, Anne M Maillard1, Borja Rodriguez-Herreros2
1Service de Génétique Médicale, University of Lausanne, Lausanne, Switzerland.
Copy number variations in the 16p11.2 region impact cognitive skills differently. Deletion carriers show deficits in phonology and inhibition, while duplication carriers may have enhanced verbal memory and phonology.
Area of Science:
- Neurogenetics
- Cognitive Neuroscience
- Psychiatry
Background:
- 16p11.2 BP4-BP5 locus copy number variations (CNVs) are common and linked to autism spectrum disorder and schizophrenia.
- Previous neuropsychological assessments of these CNVs have been limited, particularly regarding language and global cognition.
Purpose of the Study:
- To investigate the relationship between genomic copy number at the 16p11.2 locus and specific cognitive domains.
- To compare cognitive profiles of deletion carriers, duplication carriers, and intrafamilial controls.
Main Methods:
- Assessed cognitive domains in 62 deletion carriers, 44 duplication carriers, and 71 intrafamilial controls.
- Utilized neuropsychological assessments and neuroimaging analyses.
Main Results:
- Both deletion and duplication carriers exhibited decreased IQ.
- Deletion carriers showed significant impairments in phonology and inhibition, exceeding IQ-level expectations.
- Duplication carriers potentially outperformed controls in verbal memory and phonology, similar to observations in autism spectrum disorder.
- Inhibition measures correlated with neuroanatomic structures sensitive to 16p11.2 CNVs.
Conclusions:
- The 16p11.2 locus differentially modulates specific cognitive skills based on copy number.
- Further research is needed to confirm these findings and explore underlying molecular mechanisms.
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