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Although it is thought that the COMT gene may influence neural correlates (P2 and P3 ERP components) underlying working memory impairment in this chronic-pain syndrome, it has not yet been explored. Therefore, the aim of the present research was to investigate the potential effect of the COMT gene in fibromyalgia patients on ERP working memory indices (P2 and P3 components). For this purpose, 102 participants (51 patients and 51 healthy control participants) took part in the experiment. Event-related potentials and behavioral responses were recorded while participants performed a spatial n-back task. Participants had to decide if the stimulus coincided or not in the same location as the one presented one (1-back condition) or two (2-back condition) trials before. Genotypes of the COMT gene were determined through a saliva sample from all participants. Present results significantly showed lower working memory performance (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.05) in patients with fibromyalgia as compared to control participants (higher rate of errors and slower reaction times). At neural level, we found that patients exhibited enhanced frontocentral and parieto-occipital P2 amplitudes compared to control participants (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.05). Interestingly, we also observed that only fibromyalgia patients carrying the Val\/Val genotype of the COMT gene showed higher frontocentral P2 amplitudes than control participants (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.05). Current results (behavioral outcomes and P2 amplitudes) confirmed the presence of an alteration in working memory functioning in fibromyalgia. The enhancement of frontocentral P2 could be reflecting that these patients would manifest an inefficient way of activating executive attention processes, in carriers of the Val\/Val genotype of COMT. To our knowledge, the present findings are the first linking neural indices of working memory dysfunctions and COMT genotypes in fibromyalgia. Applying a subgroup of patient\u2019s strategy based on this genetic marker could be useful to establish more tailored therapeutical approaches.<\/jats:p>","DOI":"10.1007\/s00406-022-01488-4","type":"journal-article","created":{"date-parts":[[2022,9,13]],"date-time":"2022-09-13T16:02:47Z","timestamp":1663084967000},"page":"25-40","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Working memory dysfunction in fibromyalgia is associated with genotypes of the catechol- O-methyltransferase gene: an event-related potential study"],"prefix":"10.1007","volume":"273","author":[{"given":"David","family":"Ferrera","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Francisco","family":"G\u00f3mez-Esquer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Irene","family":"Pel\u00e1ez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paloma","family":"Barjola","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roberto","family":"Fernandes-Magalhaes","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alberto","family":"Carpio","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mar\u00eda Eugenia","family":"De Lahoz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mar\u00eda Carmen","family":"Mart\u00edn-Buro","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8149-4986","authenticated-orcid":false,"given":"Francisco","family":"Mercado","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2022,9,13]]},"reference":[{"key":"1488_CR1","doi-asserted-by":"publisher","first-page":"600","DOI":"10.1002\/acr.20140","volume":"62","author":"F Wolfe","year":"2010","unstructured":"Wolfe F, Clauw DJ, Fitzcharles MA et al (2010) The American college of rheumatology preliminary diagnostic criteria for fibromyalgia and measurement of symptom severity. 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