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Genome-wide examination of DNA methylation (DNAm) offers an attractive complement to studies of allelic risk given it can reflect the combined influence of genes and environment. The current study used monozygotic twins to identify differentially and variably methylated regions of the genome that distinguish twins with and without a lifetime history of early-onset MD. The sample included 150 Caucasian monozygotic twins between the ages of 15 and 20 (73% female; <jats:italic>M<\/jats:italic>age\u2009=\u200917.52\u2009<jats:italic>SD<\/jats:italic>\u2009=\u20091.28) who were assessed during a developmental stage characterized by relatively distinct neurophysiological changes. All twins were generally healthy and currently free of medications with psychotropic effects. DNAm was measured in peripheral blood cells using the Infinium Human BeadChip 450\u2009K Array. MD associations with early-onset MD were detected at 760 differentially and variably methylated probes\/regions that mapped to 428 genes. Genes and genomic regions involved neural circuitry formation, projection, functioning, and plasticity. Gene enrichment analyses implicated genes related to neuron structures and neurodevelopmental processes including cell\u2013cell adhesion genes (e.g., <jats:italic>PCDHA genes<\/jats:italic>). Genes previously implicated in mood and psychiatric disorders as well as chronic stress (e.g., <jats:italic>NRG3<\/jats:italic>) also were identified. DNAm regions associated with early-onset MD were found to overlap genetic loci identified in the latest Psychiatric Genomics Consortium meta-analysis of depression. Understanding the time course of epigenetic influences during emerging adulthood may clarify developmental phases where changes in the DNA methylome may modulate individual differences in MD risk.<\/jats:p>","DOI":"10.1038\/s41398-020-00984-2","type":"journal-article","created":{"date-parts":[[2020,8,25]],"date-time":"2020-08-25T18:03:33Z","timestamp":1598378613000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":52,"title":["An epigenome-wide association study of early-onset major depression in monozygotic twins"],"prefix":"10.1038","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1037-3121","authenticated-orcid":false,"given":"Roxann","family":"Roberson-Nay","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dana M.","family":"Lapato","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aaron R.","family":"Wolen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eva E.","family":"Lancaster","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0576-5366","authenticated-orcid":false,"given":"Bradley T.","family":"Webb","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bradley","family":"Verhulst","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John M.","family":"Hettema","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4068-4286","authenticated-orcid":false,"given":"Timothy P.","family":"York","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2020,8,25]]},"reference":[{"key":"984_CR1","doi-asserted-by":"publisher","first-page":"3095","DOI":"10.1001\/jama.289.23.3095","volume":"289","author":"RC Kessler","year":"2003","unstructured":"Kessler, R. 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