Catechol-O-methyltransferase, dopamine, and sleep-wake regulation.

Area of Science:

• Neuroscience
• Genetics
• Sleep Medicine

Background:

• Sleep regulation involves complex genetic and environmental factors.
• The catechol-O-methyltransferase (COMT) gene plays a key role in catecholamine metabolism.
• The COMT Val158Met polymorphism affects enzyme activity and prefrontal cortex dopamine levels.

Purpose of the Study:

• To investigate the impact of the COMT Val158Met polymorphism on sleep-wake regulation.
• To examine the influence of this polymorphism on cognitive function and sleep pathologies.
• To review the role of COMT in sleep disorders and psychostimulant response.

Main Methods:

• Analysis of COMT Val158Met genotypes in relation to sleep phenotypes.
• Assessment of electroencephalography (EEG) alpha oscillations and sleep deprivation recovery.
• Evaluation of daytime sleepiness and response to modafinil in narcolepsy patients.

Main Results:

• The COMT Val158Met polymorphism affects EEG alpha oscillations and recovery from sleep loss.
• This polymorphism shows sexual dimorphism and impacts daytime sleepiness in narcolepsy.
• Individuals with Val/Val genotype showed better sustained performance with modafinil during sleep deprivation.

Conclusions:

• The COMT Val158Met polymorphism is a significant factor in sleep-wake regulation and cognitive function.
• It influences susceptibility to sleep disorders and response to stimulant treatments.
• Understanding COMT genotype can personalize treatment for sleep disorders.