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. 2018 May 31:9:207.
doi: 10.3389/fpsyt.2018.00207. eCollection 2018.

Analysis of the Influence of microRNAs in Lithium Response in Bipolar Disorder

Céline S Reinbold  1   2 Andreas J Forstner  1   2   3   4   5 Julian Hecker  6 Janice M Fullerton  7   8 Per Hoffmann  1   2   3   4 Liping Hou  9 Urs Heilbronner  10 Franziska Degenhardt  3   4 Mazda Adli  11 Kazufumi Akiyama  12 Nirmala Akula  9 Raffaella Ardau  13 Bárbara Arias  14 Lena Backlund  15 Antonio Benabarre  16 Susanne Bengesser  17 Abesh K Bhattacharjee  18 Joanna M Biernacka  19   20 Armin Birner  17 Cynthia Marie-Claire  21   22 Pablo Cervantes  23 Guo-Bo Chen  24 Hsi-Chung Chen  25 Caterina Chillotti  13 Scott R Clark  26 Francesc Colom  27 David A Cousins  28 Cristiana Cruceanu  29 Piotr M Czerski  30 Alexandre Dayer  31 Bruno Étain  21   22   32 Peter Falkai  33 Louise Frisén  15 Sébastien Gard  34 Julie S Garnham  35 Fernando S Goes  36 Paul Grof  37 Oliver Gruber  38 Ryota Hashimoto  39 Joanna Hauser  30 Stefan Herms  1   2   3   4 Stéphane Jamain  40 Esther Jiménez  16 Jean-Pierre Kahn  41 Layla Kassem  9 Sarah Kittel-Schneider  42 Sebastian Kliwicki  43 Barbara König  44 Ichiro Kusumi  45 Nina Lackner  17 Gonzalo Laje  9 Mikael Landén  46   47 Catharina Lavebratt  15 Marion Leboyer  48 Susan G Leckband  49 Carlos A López Jaramillo  50 Glenda MacQueen  51 Mirko Manchia  52   53 Lina Martinsson  54 Manuel Mattheisen  55 Michael J McCarthy  56 Susan L McElroy  57 Marina Mitjans  14 Francis M Mondimore  36 Palmiero Monteleone  58   59 Caroline M Nievergelt  18 Urban Ösby  60 Norio Ozaki  61 Roy H Perlis  62 Andrea Pfennig  63 Daniela Reich-Erkelenz  10 Guy A Rouleau  64 Peter R Schofield  8   65 K Oliver Schubert  26 Barbara W Schweizer  36 Florian Seemüller  33 Giovanni Severino  66 Tatyana Shekhtman  18 Paul D Shilling  18 Kazutaka Shimoda  67 Christian Simhandl  68   69 Claire M Slaney  35 Jordan W Smoller  62 Alessio Squassina  66 Thomas J Stamm  11   70 Pavla Stopkova  71 Sarah K Tighe  72 Alfonso Tortorella  59 Gustavo Turecki  29 Julia Volkert  42 Stephanie H Witt  73 Adam J Wright  74 L Trevor Young  75 Peter P Zandi  76 James B Potash  72 J Raymond DePaulo  36 Michael Bauer  63 Eva Reininghaus  17 Tomáš Novák  71 Jean-Michel Aubry  31 Mario Maj  59 Bernhard T Baune  26 Philip B Mitchell  74 Eduard Vieta  16 Mark A Frye  20 Janusz K Rybakowski  43 Po-Hsiu Kuo  77 Tadafumi Kato  78 Maria Grigoroiu-Serbanescu  79 Andreas Reif  42 Maria Del Zompo  66 Frank Bellivier  21   22   32 Martin Schalling  15 Naomi R Wray  24 John R Kelsoe  18 Martin Alda  35   71 Francis J McMahon  9 Thomas G Schulze  9   10   36   38   73 Marcella Rietschel  73 Markus M Nöthen  3   4 Sven Cichon  1   2   3   4   80
Affiliations

Analysis of the Influence of microRNAs in Lithium Response in Bipolar Disorder

Céline S Reinbold et al. Front Psychiatry. .

Abstract

Bipolar disorder (BD) is a common, highly heritable neuropsychiatric disease characterized by recurrent episodes of mania and depression. Lithium is the best-established long-term treatment for BD, even though individual response is highly variable. Evidence suggests that some of this variability has a genetic basis. This is supported by the largest genome-wide association study (GWAS) of lithium response to date conducted by the International Consortium on Lithium Genetics (ConLiGen). Recently, we performed the first genome-wide analysis of the involvement of miRNAs in BD and identified nine BD-associated miRNAs. However, it is unknown whether these miRNAs are also associated with lithium response in BD. In the present study, we therefore tested whether common variants at these nine candidate miRNAs contribute to the variance in lithium response in BD. Furthermore, we systematically analyzed whether any other miRNA in the genome is implicated in the response to lithium. For this purpose, we performed gene-based tests for all known miRNA coding genes in the ConLiGen GWAS dataset (n = 2,563 patients) using a set-based testing approach adapted from the versatile gene-based test for GWAS (VEGAS2). In the candidate approach, miR-499a showed a nominally significant association with lithium response, providing some evidence for involvement in both development and treatment of BD. In the genome-wide miRNA analysis, 71 miRNAs showed nominally significant associations with the dichotomous phenotype and 106 with the continuous trait for treatment response. A total of 15 miRNAs revealed nominal significance in both phenotypes with miR-633 showing the strongest association with the continuous trait (p = 9.80E-04) and miR-607 with the dichotomous phenotype (p = 5.79E-04). No association between miRNAs and treatment response to lithium in BD in either of the tested conditions withstood multiple testing correction. Given the limited power of our study, the investigation of miRNAs in larger GWAS samples of BD and lithium response is warranted.

Keywords: bipolar disorder; common variants; genome-wide association study; lithium response; microRNA.

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