PRODH gene is associated with executive function in schizophrenic families

Area of Science:

• Neuroscience
• Genetics
• Psychiatry

Background:

• Schizophrenia is associated with neurocognitive deficits.
• Genetic factors are implicated in schizophrenia pathogenesis and cognitive dysfunction.
• Previous studies suggest roles for PRODH and COMT genes in schizophrenia and cognition, but findings are inconsistent.

Purpose of the Study:

• To investigate the association between single nucleotide polymorphisms (SNPs) in the PRODH and COMT genes and neurocognitive functions in first-episode schizophrenia.
• To identify specific genetic variants influencing cognitive performance in schizophrenia.

Main Methods:

• Genotyping of six SNPs in PRODH and two SNPs in COMT in 167 first-episode schizophrenic families.
• Assessment of neurocognitive functions using 14 standardized neuropsychological tests.
• Association analysis of SNPs and haplotypes with quantitative neuropsychological measures.

Main Results:

• A specific haplotype of PRODH SNPs (1945T/C and 1852G/A) was significantly associated with impaired performance on the Tower of Hanoi task, a measure of planning capacity.
• No significant associations were found between other PRODH or COMT SNPs/haplotypes and the assessed neurocognitive traits.
• Previous reports on COMT gene association with cognitive function were not replicated.

Conclusions:

• Variation within the PRODH gene is associated with specific neurocognitive deficits, particularly planning ability, in schizophrenia.
• This finding extends previous research linking PRODH to schizophrenia.
• The study did not find evidence supporting an association between COMT gene variants and cognitive function in this cohort.