The role of genetic polymorphisms in executive functioning performance in temporal lobe epilepsy

Area of Science:

• Neuroscience
• Genetics
• Epilepsy Research

Background:

• Pharmacoresistant temporal lobe epilepsy (TLE) often involves cognitive deficits, particularly in executive functions (EF).
• Genetic factors may influence individual differences in cognitive performance in TLE.
• Understanding these genetic influences can aid in personalized treatment strategies.

Purpose of the Study:

• To investigate the association between specific genetic polymorphisms (APOE ε4, BDNF Met, COMT Val) and executive functioning in patients with pharmacoresistant TLE.
• To determine if these genetic variations contribute to the variance in EF performance in this population.

Main Methods:

• Ninety-three adult TLE patients underwent comprehensive neuropsychological evaluations assessing various executive functions.
• Genotyping was performed for APOE, BDNF, and COMT genes using DNA from blood or brain tissue.
• Statistical analyses adjusted for general cognitive ability to assess the impact of genetic polymorphisms.

Main Results:

• COMT Val carriers exhibited poorer performance in semantic verbal fluency and color word interference tasks.
• BDNF Met carriers showed diminished phonemic verbal fluency compared to non-carriers.
• APOE ε4 polymorphism was not significantly associated with any executive function measures.

Conclusions:

• COMT and BDNF gene polymorphisms are linked to specific executive function deficits in TLE patients.
• These genetic factors can explain a significant portion (up to 16%) of the variability in EF test performance.
• The findings highlight the role of genetic predispositions in cognitive outcomes for TLE.