The COMTp.Val158Met Polymorphism and Cognitive Performance in Adult Development, Healthy Aging and Mild Cognitive...

Area of Science:

• Neuroscience
• Genetics
• Cognitive Psychology

Background:

• Cognitive function is thought to be increasingly influenced by genetic factors with age.
• The catechol-O-methyltransferase (COMT) p.Val158Met polymorphism's role in cognition across the lifespan is not fully understood.
• Investigating this polymorphism in relation to cognitive capacity in adult development, healthy aging, and mild cognitive impairment (MCI) is crucial.

Purpose of the Study:

• To examine the association between the COMT p.Val158Met polymorphism and cognitive performance.
• To determine if this association differs across adult development, healthy aging, and MCI.
• To compare findings in two distinct birth cohorts (1930-32 and 1950-52).

Main Methods:

• Neuropsychological assessments were performed on 587 participants across three waves (1993-2008).
• COMT genotype was determined using PCR amplification and NlaIII digestion.
• Participants were analyzed based on their birth cohort.

Main Results:

• The COMT p.Val158Met polymorphism significantly affected attention and cognitive flexibility in the younger cohort.
• No significant effects of the COMT p.Val158Met polymorphism were found for attention and cognitive flexibility in the older cohort.
• The impact of the COMT genotype on these cognitive functions was age-dependent.

Conclusions:

• The COMT p.Val158Met genotype is important for attention and cognitive flexibility in midlife.
• Its influence is less pronounced in healthy aging and the development of MCI.
• The study suggests that the effect of COMT on cognition decreases from midlife into older age.