GWAS for executive function and processing speed suggests involvement of the CADM2 gene

Area of Science:

• Genetics
• Neuroscience
• Cognitive Epidemiology

Background:

• Understanding genetic contributions to normal cognitive variation is crucial for aging research.
• Previous studies have explored genetic factors influencing executive functioning and information processing speed.
• The CHARGE consortium provides a large dataset for genome-wide association studies (GWAS) in older adults.

Purpose of the Study:

• To identify common genetic variants associated with normal variation in executive functioning and information processing speed.
• To investigate the role of the cell adhesion molecule 2 (CADM2) gene in cognitive performance.

Main Methods:

• Conducted a genome-wide association study (GWAS) in non-demented older adults from the CHARGE consortium.
• Analyzed neuropsychological test data for executive functioning and information processing speed across multiple cohorts.
• Performed replication analysis in independent cohorts to validate significant findings.

Main Results:

• Identified a significant association between single-nucleotide polymorphism (SNP) rs17518584 in the CADM2 gene and performance on the Letter Digit Substitution Test (LDST)/Digit Symbol Substitution Task (DSST).
• The associated SNP (rs17518584) is located upstream of the major CADM2 transcript and associated with CADM2 expression in the cingulate cortex.
• CADM2 protein is implicated in glutamate signaling, GABA transport, and neuron cell-cell adhesion.

Conclusions:

• Genetic variation in the CADM2 gene is associated with individual differences in information processing speed.
• The findings highlight CADM2 as a potential genetic factor influencing cognitive performance in older adults.
• Further research is warranted to elucidate the precise mechanisms by which CADM2 affects cognitive functions.