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The reasons for this high variability in lithium response are not well understood. Transcriptome-wide profiling, which tests the interface between genes and the environment, represents a viable means of exploring the molecular mechanisms underlying lithium response variability. Thus, in the present study we performed co-expression network analyses of whole-blood-derived RNA-seq data from <jats:italic>n<\/jats:italic>\u2009=\u200950 lithium-treated BPAD patients. Lithium response was assessed using the well-validated ALDA scale, which we used to define both a continuous and a dichotomous measure. We identified a nominally significant correlation between a co-expression module comprising 46 genes and lithium response represented as a continuous (i.e., scale ranging 0\u201310) phenotype (cor\u2009=\u2009\u22120.299, <jats:italic>p<\/jats:italic>\u2009=\u20090.035). Forty-three of these 46 genes had reduced mRNA expression levels in better lithium responders relative to poorer responders, and the central regulators of this module were all mitochondrially-encoded (<jats:italic>MT-ND1<\/jats:italic>, <jats:italic>MT-ATP6<\/jats:italic>, <jats:italic>MT-CYB<\/jats:italic>). Accordingly, enrichment analyses indicated that genes involved in mitochondrial functioning were heavily over-represented in this module, specifically highlighting the electron transport chain (ETC) and oxidative phosphorylation (OXPHOS) as affected processes. Disrupted ETC and OXPHOS activity have previously been implicated in the pathophysiology of BPAD. Our data adds to previous evidence suggesting that a normalisation of these processes could be central to lithium\u2019s mode of action, and could underlie a favourable therapeutic response.<\/jats:p>","DOI":"10.1038\/s41398-018-0237-0","type":"journal-article","created":{"date-parts":[[2018,9,5]],"date-time":"2018-09-05T18:01:45Z","timestamp":1536170505000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":31,"title":["A gene co-expression module implicating the mitochondrial electron transport chain is associated with long-term response to lithium treatment in bipolar affective disorder"],"prefix":"10.1038","volume":"8","author":[{"given":"David","family":"Stacey","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"K. 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