{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n Catechol‐O‐methyltransferase (COMT) is a critical enzyme involved in the metabolic inactivation of catecholamines – principally dopamine, but also norepinephrine and epinephrine – by catalyzing their O‐methylation. COMT’s activity is especially important in the prefrontal cortex, where it regulates synaptic dopamine levels, thereby directly modulating executive functions such as working memory, cognitive flexibility, and attentional control. Functional genetic polymorphisms, most notably the Val158Met (or Val108/158Met) variant, produce up to a fourfold variation in enzyme activity; carriers of the low‐activity Met allele tend to exhibit enhanced prefrontal dopamine tone, improved working memory and reduced perseverative errors on tasks like the Wisconsin Card Sorting Test, yet paradoxically may also show increased sensitivity to pain and altered emotional reactivity, while carriers of the high‐activity Val allele typically display lower cortical dopamine availability, less efficient prefrontal processing, and in some contexts an elevated risk for schizophrenia and cannabis‐induced psychosis [(1,10,8,4,25)]."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "5"}]}, {"type": "t", "text": " "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Beyond its well‐documented role in cognitive processes, COMT function has been linked to variability in pain sensitivity. Several studies demonstrate that distinct COMT haplotypes – which, in part, include the Val158Met SNP as well as other variations that affect mRNA structure and protein translation – are associated with differences in both baseline nociceptive sensitivity and the degree of temporal summation of pain, with higher COMT activity generally correlating with reduced pain sensitivity [(2,6,21,16)]."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "6", "end_ref": "9"}]}, {"type": "t", "text": " Furthermore, preclinical models have underscored how alterations in COMT expression can modulate not only cognitive performance and stress responses but also affect pain and even drug efficacy (e.g., morphine dosing), suggesting that COMT activity has translational relevance for both psychiatric disorders and pain management [(3,17,19)]."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "10", "end_ref": "12"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n In neuroimaging studies, variations in COMT genotype are consistently associated with differences in prefrontal and limbic circuit activation. Individuals with higher dopamine tone (i.e. Met allele carriers) tend to show more efficient prefrontal processing during working memory and executive tasks, as well as distinct patterns of connectivity in corticolimbic networks during affectively salient processing. Such findings have provided a neural substrate linking COMT genetic variation not only to cognitive performance but also to affective modulation and stress responsiveness [(12,15,24)]."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "13", "end_ref": "15"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Additionally, COMT expression studies have revealed that its mRNA is abundantly expressed in neurons of the prefrontal cortex and striatum, supporting its role in modulating dopamine-dependent neurotransmission. Alterations in COMT expression, including changes related to promoter methylation, may contribute to the pathophysiology of psychiatric conditions such as schizophrenia, bipolar disorder, and even aspects of neurodegenerative conditions, wherein COMT modulation can differentially affect executive functions versus broader cognitive decline [(7,9,13,22)]."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "16", "end_ref": "19"}]}, {"type": "t", "text": " Moreover, COMT’s genetic interactions with other neurotransmitter systems (for example, with opioid receptor genes or GABA‐related genes) further highlight its multifaceted impact on brain function, influencing both the cognitive and affective responses to environmental challenges [(5,14,23)]."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "20", "end_ref": "22"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n In summary, COMT plays an essential regulatory role in dopamine catabolism with significant implications for cognitive, affective, and pain-related processes. Its functional polymorphisms shape prefrontal dopamine tone, influencing neural circuit efficiency and behavior, and provide a mechanistic link between genotype and susceptibility to neuropsychiatric disorders as well as individual differences in drug response. These multifactorial effects underscore the promise of COMT as both a biomarker and a potential therapeutic target across a range of conditions [(11,20,18)]."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "23", "end_ref": "25"}]}, {"type": "t", "text": "\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "M F Egan, T E Goldberg, B S Kolachana, et al. 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