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Transcriptomic imputation approaches combine eQTL reference panels with large-scale genotype data in order to test associations between disease and gene expression. These genic associations could elucidate signals in complex genome-wide association study (GWAS) loci and may disentangle the role of different tissues in disease development. We used the largest eQTL reference panel for the dorso-lateral prefrontal cortex (DLPFC) to create a set of gene expression predictors and demonstrate their utility. We applied DLPFC and 12 GTEx-brain predictors to 40,299 schizophrenia cases and 65,264 matched controls for a large transcriptomic imputation study of schizophrenia. We identified 413 genic associations across 13 brain regions. Stepwise conditioning identified 67 non-MHC genes, of which 14 did not fall within previous GWAS loci. We identified 36 significantly enriched pathways, including hexosaminidase-A deficiency, and multiple porphyric disorder pathways. We investigated developmental expression patterns among the 67 non-MHC genes and identified specific groups of pre- and postnatal expression. Working Group The Schizophrenia Working Group of the Psychiatric Genomics Consortium Stephan Ripke37,38 Benjamin M. Neale37,38,39,40 Aiden Corvin41 James T. R. Walters6 Kai-How Farh37 Peter A. Holmans6,42 Phil Lee37,38,40 Brendan Bulik-Sullivan37,38 David A. Collier43,44 Hailiang Huang37,39 Tune H. Pers39,45,46 Ingrid Agartz47,48,49 Esben Agerbo8,32,33 Margot Albus50 Madeline Alexander51 Farooq Amin52,53 Silviu A. Bacanu54 Martin Begemann55 Richard A. Belliveau Jr38 Judit Bene56,57 Sarah E. Bergen38,58 Elizabeth Bevilacqua38 Tim B. Bigdeli54 Donald W. Black59 Richard Bruggeman60 Nancy G. Buccola61 Randy L. Buckner62,63,64 William Byerley65 Wiepke Cahn66 Guiqing Cai2,3 Dominique Campion67 Rita M. Cantor10 Vaughan J. Carr68,69 Noa Carrera6 Stanley V. Catts68,70 Kimberly D. Chambert38 Raymond C. K. Chan71 Ronald Y. L. Chen72 Eric Y. H. Chen72,73 Wei Cheng15 Eric F. C. Cheung74 Siow Ann Chong75 C. Robert Cloninger76 David Cohen77 Nadine Cohen78 Paul Cormican41 Nick Craddock6,42 James J. Crowley79 David Curtis80,81 Michael Davidson82 Kenneth L. Davis3 Franziska Degenhardt83,84 Jurgen Del Favero85 Ditte Demontis7,8,9 Dimitris Dikeos86 Timothy Dinan87 Srdjan Djurovic49,88 Gary Donohoe41,89 Elodie Drapeau3 Jubao Duan90,91 Frank Dudbridge92 Naser Durmishi93 Peter Eichhammer94 Johan Eriksson95,96,97 Valentina Escott-Price6 Laurent Essioux98 Ayman H. Fanous99,100,101,102 Martilias S. Farrell79 Josef Frank103 Lude Franke104 Robert Freedman105 Nelson B. Freimer106 Marion Friedl107 Joseph I. Friedman3 Menachem Fromer1,37,38,40 Giulio Genovese38 Lyudmila Georgieva6 Ina Giegling107,108 Paola Giusti-Rodríguez79 Stephanie Godard109 Jacqueline I. Goldstein37,39 Vera Golimbet110 Srihari Gopal111 Jacob Gratten112 Lieuwe de Haan113 Christian Hammer55 Marian L. Hamshere6 Mark Hansen114 Thomas Hansen8,30 Vahram Haroutunian3,25,23 Annette M. Hartmann107 Frans A. Henskens68,115,116 Stefan Herms83,84,117 Joel N. Hirschhorn39,46,118 Per Hoffmann83,84,117 Andrea Hofman83,84 Mads V. Hollegaard36 David M. Hougaard36 Masashi Ikeda119 Inge Joa120 Antonio Julia121 Rene S. Kahn66 Luba Kalaydjieva122,123 Sena Karachanak-Yankova124 Juha Karjalainen104 David Kavanagh6 Matthew C. Keller125 James L. Kennedy126,127,128 Andrey Khrunin129 Yunjung Kim79 Janis Klovins130 James A. Knowles131 Bettina Konte107 Vaidutis Kucinskas132 Zita Ausrele Kucinskiene132 Hana Kuzelova-Ptackova133 Anna K. Kahler58 Claudine Laurent51,134 Jimmy Lee Chee Keong75,135 S. Hong Lee112 Sophie E. Legge6 Bernard Lerer136 Miaoxin Li72,73,137 Tao Li138 Kung-Yee Liang139 Jeffrey Lieberman140 Svetlana Limborska129 Carmel M. Loughland68,141 Jan Lubinski142 Jouko Lonnqvist143 Milan Macek Jr133 Patrik K. E. Magnusson58 Brion S. Maher144 Wolfgang Maier145 Jacques Mallet146 Sara Marsal121 Manuel Mattheisen7,8,9,147 Morten Mattingsdal49,148 Robert W. McCarley149,150 Colm McDonald151 Andrew M. McIntosh152,153 Sandra Meier103 Carin J. Meijer113 Bela Melegh56,57 Ingrid Melle49,154 Raquelle I. Mesholam-Gately149,155 Andres Metspalu156 Patricia T. Michie68,157 Lili Milani156 Vihra Milanova158 Younes Mokrab43 Derek W. Morris41,89 Ole Mors8,9,159 Kieran C. Murphy160 Robin M. Murray161 Inez Myin-Germeys162 Bertram Muller-Myhsok163,164,165 Mari Nelis156 Igor Nenadic166 Deborah A. Nertney167 Gerald Nestadt168 Kristin K. Nicodemus169 Liene Nikitina-Zake130 Laura Nisenbaum170 Annelie Nordin171 Eadbhard O’Callaghan172 Colm O’Dushlaine38 F. Anthony O’Neill173 Sang-Yun Oh174 Ann Olincy126 Line Olsen8,64 Jim Van Os162,175 Christos Pantelis68,176 George N. Papadimitriou86 Sergi Papiol55 Elena Parkhomenko3 Michele T. Pato131 Tiina Paunio177,178 Milica Pejovic-Milovancevic179 Diana O. Perkins180 Olli Pietiläinen178,181 Jonathan Pimm81 Andrew J. Pocklington6 John Powell161 Alkes Price39,182 Ann E. Pulver168 Shaun M. Purcell1 Digby Quested183 Henrik B. Rasmussen30,43 Abraham Reichenberg3 Mark A. Reimers184 Alexander L. Richards6 Joshua L. Roffman62,64 Panos Roussos1,4 Douglas M. Ruderfer1,5,6 Veikko Salomaa97 Alan R. Sanders90,91 Ulrich Schall68,141 Christian R. Schubert185 Thomas G. Schulze103,186 Sibylle G. Schwab187 Edward M. Scolnick38 Rodney J. Scott68,188,189 Larry J. Seidman144,155 Jianxin Shi190 Engilbert Sigurdsson191 Teimuraz Silagadze192 Jeremy M. Silverman3,193 Kang Sim75 Petr Slominsky129 Jordan W. Smoller38,40 Hon-Cheong So72 Chris C. A. Spencer194 Eli A. Stahl1,2,3,4 Hreinn Stefansson195 Stacy Steinberg195 Elisabeth Stogmann196 Richard E. Straub197 Eric Strengman66,198 Jana Strohmaier103 T. Scott Stroup140 Mythily Subramaniam75 Jaana Suvisaari143 Dragan M. Svrakic76 Jin P. Szatkiewicz79 Erik Soderman47 Srinivas Thirumalai199 Draga Toncheva124 Sarah Tosato200 Juha Veijola201,202 John Waddington203 Dermot Walsh204 Dai Wang111 Qiang Wang138 Bradley T. Webb54 Mark Weiser82 Dieter B. Wildenauer205 Nigel M. Williams6 Stephanie Williams79 Stephanie H. Witt103 Aaron R. Wolen184 Emily H. M. Wong72 Brandon K. Wormley54 Hualin Simon Xi206 Clement C. Zai126,127 Xuebin Zheng207 Fritz Zimprich196 Naomi R. Wray112 Kari Stefansson195 Peter M. Visscher112 Rolf Adolfsson171 Ole A. Andreassen49,154 Douglas H. R. Blackwood153 Elvira Bramon208 Joseph D. Buxbaum2,3,24,25 Anders D. Børglum7,8,9,159 Sven Cichon83,84,117,209 Ariel Darvasi210 Enrico Domenici211 Hannelore Ehrenreich55 Tonu Esko39,46,118,156 Pablo V. Gejman90,91 Michael Gill41 Hugh Gurling81 Christina M. Hultman58 Nakao Iwata119 Assen V. Jablensky68,123,205,212 Erik G. Jonsson47,49 Kenneth S. Kendler213 George Kirov6 Jo Knight125,127,128 Todd Lencz214,215,216 Douglas F. Levinson51 Qingqin S. Li111 Jianjun Liu207,217 Anil K. Malhotra214,215,216 Steven A. McCarroll38,118 Andrew McQuillin81 Jennifer L. Moran38 Preben B. Mortensen8,32,33 Bryan J. Mowry112,218 Markus M. Nothen83,84 Roel A. Ophoff10,66,105 Michael J. Owen6,42 Aarno Palotie38,40,181 Carlos N. Pato131 Tracey L. Petryshen38,149,219 Danielle Posthuma220,221,222 Marcella Rietschel103 Brien P. Riley213 Dan Rujescu107,108 Pak C. Sham72,73,137 Pamela Sklar1,2,3,4,25 David St Clair223 Daniel R. Weinberger197,224 Jens R. Wendland185 Thomas Werge8,30,225 Mark J. Daly37,38,39 Patrick F. Sullivan58,79,180 Michael C. 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Hoffman-La Roche, Basel, Switzerland. 99Department of Psychiatry, Georgetown University School of Medicine, Washington, DC, USA. 100Department of Psychiatry, Keck School of Medicine of the University of Southern California, Los Angeles, CA, USA. 101Department of Psychiatry, Virginia Commonwealth University School of Medicine, Richmond, VA, USA. 102Mental Health Service Line, Washington VA Medical Center, Washington, DC, USA. 103Department of Genetic Epidemiology in Psychiatry, Central Institute of Mental Health, Medical Faculty Mannheim, University of Heidelberg, Heidelberg, Mannheim, Germany. 104Department of Genetics, University of Groningen, University Medical Centre Groningen, Groningen, the Netherlands. 105Department of Psychiatry, University of Colorado Denver, Aurora, CO, USA. 106Center for Neurobehavioral Genetics, Semel Institute for Neuroscience and Human Behavior, University of California Los Angeles, Los Angeles, CA, USA. 107Department of Psychiatry, University of Halle, Halle, Germany. 108Department of Psychiatry, University of Munich, Munich, Germany. 109Departments of Psychiatry and Human and Molecular Genetics, INSERM, Institut de Myologie, Hôpital de la Pitiè-Salpêtrière, Paris, France. 110Mental Health Research Centre, Russian Academy of Medical Sciences, Moscow, Russia. 111Neuroscience Therapeutic Area, Janssen Research and Development, Raritan, NJ, USA. 112Queensland Brain Institute, The University of Queensland, Brisbane, Queensland, Australia. 113Academic Medical Centre University of Amsterdam, Department of Psychiatry, Amsterdam, the Netherlands. 114Illumina, La Jolla, CA, USA. 115Priority Research Centre for Health Behaviour, University of Newcastle, Newcastle, New South Wales, Australia. 116School of Electrical Engineering and Computer Science, University of Newcastle, Newcastle, New South Wales, Australia. 117Division of Medical Genetics, Department of Biomedicine, University of Basel, Basel, Switzerland. 118Department of Genetics, 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UK. 195deCODE Genetics, Reykjavik, Iceland. 196Department of Clinical Neurology, Medical University of Vienna, Wien, Austria. 197Lieber Institute for Brain Development, Baltimore, MD, USA. 198Department of Medical Genetics, University Medical Centre Utrecht, Utrecht, the Netherlands. 199Berkshire Healthcare NHS Foundation Trust, Bracknell, UK. 200Section of Psychiatry, University of Verona, Verona, Italy. 201Department of Psychiatry, University of Oulu, Oulu, Finland. 202University Hospital of Oulu, Oulu, Finland. 203Molecular and Cellular Therapeutics, Royal College of Surgeons in Ireland, Dublin, Ireland. 204Health Research Board, Dublin, Ireland. 205School of Psychiatry and Clinical Neurosciences, The University of Western Australia, Perth, Western Australia, Australia. 206Computational Sciences CoE, Pfizer Worldwide Research and Development, Cambridge, MA, USA. 207Human Genetics, Genome Institute of Singapore, A*STAR, Singapore, Singapore. 208University College London, London, UK. 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Hoffman-La Roche, Basel, Switzerland. 212Centre for Clinical Research in Neuropsychiatry, School of Psychiatry and Clinical Neurosciences, The University of Western Australia, Medical Research Foundation Building, Perth, Western Australia, Australia. 213Virginia Institute for Psychiatric and Behavioral Genetics, Departments of Psychiatry and Human and Molecular Genetics, Virginia Commonwealth University, Richmond, VA, USA. 214The Feinstein Institute for Medical Research, Manhasset, NY, USA. 215The Hofstra NS-LIJ School of Medicine, Hempstead, NY, USA. 216The Zucker Hillside Hospital, Glen Oaks, NY, USA. 217Saw Swee Hock School of Public Health, National University of Singapore, Singapore, Singapore. 218Queensland Centre for Mental Health Research, University of Queensland, Brisbane, Queensland, Australia. 219Center for HumanGenetic Research and Department of Psychiatry, Massachusetts General Hospital, Boston, MA, USA. 220Department of Child and Adolescent Psychiatry, Erasmus University Medical Centre, Rotterdam, the Netherlands. 221Department of Complex Trait Genetics, Neuroscience Campus Amsterdam, VU University Medical Center Amsterdam, Amsterdam, the Netherlands. 222Department of Functional Genomics, Center for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam, VU University, Amsterdam, the Netherlands. 223University of Aberdeen, Institute of Medical Sciences, Aberdeen, UK. 224Departments of Psychiatry, Neurology, Neuroscience and Institute of Genetic Medicine, Johns Hopkins School of Medicine, Baltimore, MD, USA. 225Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark.

How gene expression correlates with schizophrenia across individuals is beginning to be examined through analyses of RNA-seq from postmortem brains of individuals with disease and control brains. Here we focus on variation in allele-specific expression, following up on the CommonMind Consortium (CMC) RNA-seq experiments of nearly 600 human dorsolateral prefrontal cortex (DLPFC) samples. Analyzing the extent of allelic expression bias—a hallmark of imprinting—we find that the number of imprinted human genes is consistent with lower estimates (≈0.5% of all genes), and thus contradicts much higher estimates. Moreover, the handful of putatively imprinted genes are all in close genomic proximity to known imprinted genes. Joint analysis of the imprinted genes across hundreds of individuals allowed us to establish how allelic bias depends on various factors. We find that age and genetic ancestry have gene-specific, differential effect on allelic bias. In contrast, allelic bias appears to be independent of schizophrenia., This study analyzes allelic expression bias in post-mortem brains of healthy individuals and those diagnosed with schizophrenia or bipolar disorder. The study shows that the number of imprinted genes is consistent with low estimates, and that allelic bias is independent of psychiatric disease status.