Associations between the CNTNAP2 gene, dorsolateral prefrontal cortex, and cognitive performance on the Stroop task

Area of Science:

• Neurogenetics
• Cognitive Neuroscience
• Neuroimaging

Background:

• The contactin-associated protein-like 2 (CNTNAP2) gene is highly expressed in the human prefrontal cortex and has been associated with autism and language impairments.
• Previous research suggests potential links between CNTNAP2, the dorsolateral prefrontal cortex (DLPFC), and cognitive functions, but these have not been investigated concurrently.
• Understanding these relationships is crucial for elucidating the genetic underpinnings of cognitive abilities and neurological disorders.

Purpose of the Study:

• To investigate the associations between CNTNAP2 gene variants, DLPFC structure, and cognitive performance in healthy adults.
• To examine whether DLPFC structure mediates the relationship between CNTNAP2 genotype and cognitive control.
• To provide direct evidence linking CNTNAP2, DLPFC morphology, and executive functions.

Main Methods:

• Structural MRI, genetic data, and behavioral data (Stroop task) were collected from 317 healthy Chinese adults.
• Statistical analyses were performed to assess the associations between CNTNAP2 single nucleotide polymorphisms (SNPs) and bilateral DLPFC volume and surface area, controlling for covariates.
• Mediation analyses were conducted to determine if DLPFC surface area mediates the effect of CNTNAP2 genotype on cognitive performance.

Main Results:

• The CNTNAP2 SNP rs7809486 showed a strong association with bilateral DLPFC volume, with GG homozygotes exhibiting larger volumes and surface areas.
• The CNTNAP2 SNP rs4726946 was associated with increased left DLPFC volume and surface area, and enhanced cognitive performance in TT homozygotes.
• Left DLPFC surface area significantly mediated the association between the CNTNAP2 rs4726946 genotype and cognitive performance, indicating a structural pathway.

Conclusions:

• This study provides the first direct evidence for associations between the CNTNAP2 gene and left DLPFC structure.
• The findings highlight a significant link between CNTNAP2 genetic variants, DLPFC morphology, and cognitive control.
• These results contribute to understanding the neurobiological mechanisms underlying cognitive functions influenced by CNTNAP2.