Publications 2025

Agrawal A, Bulik CM, Abebe DS, Andreassen OA, Atkinson EG, Choi KW, Corvin A, Davies HL, Davis LK, Docherty AR, Edenberg HJ, Franke B, Gelernter J, Giusti-Rodríguez P, Hettema JM, Hjerling-Leffler J, Huang H, Johnson EC, Lewis CM, Lu Y, Lynall ME, Martin J, McIntosh AM, Montalvo-Ortiz JL, Mullins N et al. (2025)
The Psychiatric Genomics Consortium: discoveries and directions
Lancet Psychiatry, 12 (8), 600-610
DOI 10.1016/S2215-0366(25)00124-5, PubMed 40582370

Ahn Y, Kim J, Jung K, Lee DJ, Jung JY, Eom Y, Park S, Kim J, Kim H, Jo H, Hong S, O'Connell KS, Andreassen OA, Myung W, Won HH (2025)
Relationship Between Problematic Alcohol Use and Various Psychiatric Disorders: A Genetically Informed Study
Am J Psychiatry, 182 (7), 671-682
DOI 10.1176/appi.ajp.20240095, PubMed 40329641

Hope S, Lin A, Rodevand L, Hübenette SJ, Quintana DS, Sønderby IE, Cheng W, Frei O, Bahrami S, Hindley GFL, Kaale A, Shadrin AA, O'Connell KS, Parker N, Djurovic S, Nærland T, Andreassen OA (2025)
Shared genetic architecture between autism spectrum disorder, loneliness, and social isolation reveals novel genetic loci
Psychiatr Genet (in press)
DOI 10.1097/YPG.0000000000000406, PubMed 41263488

Höffler KD, Katrinli S, Halvorsen MW, Stavrum AK, O'Connell KS, Shadrin A, Djurovic S, Andreassen OA, Crowley JJ, Haavik J, Hagen K, Kvale G, Ressler K, Hansen B, Soares JC, Fries GR, Smith AK, Le Hellard S (2025)
Optimizing genetic ancestry adjustment in DNA methylation studies: a comparative analysis of approaches
Epigenetics Chromatin, 18 (1), 69
DOI 10.1186/s13072-025-00627-0, PubMed 41088295

Icick R, Shadrin A, Holen B, Karadag N, Parker N, O'Connell KS, Frei O, Bahrami S, Høegh MC, Lagerberg TV, Cheng W, Seibert TM, Djurovic S, Dale AM, Zhou H, Edenberg HJ, Gelernter J, Smeland OB, Hindley G, Andreassen OA (2025)
Identification of risk variants and cross-disorder pleiotropy through multi-ancestry genome-wide analysis of alcohol use disorder
Nat Ment Health, 3 (2), 253-265
DOI 10.1038/s44220-024-00353-8, PubMed 40322774

Jung JY, Ahn Y, Park JW, Jung K, Kim S, Lim S, Jung SH, Kim H, Kim B, Hwang MY, Kim YJ, Park WY, Okbay A, O'Connell KS, Andreassen OA, Myung W, Won HH (2025)
Polygenic overlap between subjective well-being and psychiatric disorders and cross-ancestry validation
Nat Hum Behav, 9 (6), 1272-1282
DOI 10.1038/s41562-025-02155-z, PubMed 40229577

Koch E, Puusepp T, Einarsson G, Mitchell BL, Harder A, Lin Y, García-Marín LM, Krebs K, Shadrin AA, Xiong Y, Estonian Biobank Research Team, Frei O, Lu Y, Hägg S, Rentería ME, Medland SE, Wray NR, Martin NG, Hübel C, Breen G, Thorgeirsson T, Stefánsson H, Stefánsson K, Lehto K, Milani L et al. (2025)
Genome-wide meta-analyses of non-response to antidepressants provide insights into underlying molecular genetics and suggest potential pharmacotherapies
Mol Psychiatry (in press)
DOI 10.1038/s41380-025-03357-7, PubMed 41261141

Koch E, Smart S, Einarsson G, Kämpe A, Jonsson L, Alver M, Iveson M, Göteson A, Pardiñas AF, Sønderby IE, O'Connell KS, Li Q, Lu Y, Stefánsson H, Stefánsson K, Whalley H, Landén M, O'Donovan MC, Smerud K, Dawson GR, Werge T, Buil A, Reif A, Milani L, Molden E et al. (2025)
Recommendations for defining treatment outcomes in major psychiatric disorders using real-world data
Lancet Psychiatry, 12 (6), 457-468
DOI 10.1016/S2215-0366(25)00061-6, PubMed 40222385

Koromina M, Ravi A, Panagiotaropoulou G, Schilder BM, Humphrey J, Braun A, Bigdeli T, Chatzinakos C, Coombes BJ, Kim J, Liu X, Terao C, O'Connell KS, Adams MJ, Adolfsson R, Alda M, Alfredsson L, Andlauer TFM, Andreassen OA, Antoniou A, Baune BT, Bengesser S, Biernacka J, Boehnke M, Bosch R et al. (2025)
Fine-mapping genomic loci refines bipolar disorder risk genes
Nat Neurosci, 28 (7), 1393-1403
DOI 10.1038/s41593-025-01998-z, PubMed 40562893

Koromina M, Ravi A, Panagiotaropoulou G, Schilder BM, Humphrey J, Braun A, Bigdeli T, Chatzinakos C, Coombes BJ, Kim J, Liu X, Terao C, O'Connell KS, Adams MJ, Adolfsson R, Alda M, Alfredsson L, Andlauer TFM, Andreassen OA, Antoniou A, Baune BT, Bengesser S, Biernacka J, Boehnke M, Bosch R et al. (2025)
Author Correction: Fine-mapping genomic loci refines bipolar disorder risk genes
Nat Neurosci (in press)
DOI 10.1038/s41593-025-02133-8, PubMed 41145888

Nguyen TD, Meijsen JJ, Sigström R, Kuja-Halkola R, Xiong Y, Harder A, Kowalec K, Pasman JA, Scarpa C, Hörbeck E, Jonsson L, Hägg S, Mullins N, O'Connell KS, Dalman C, Helenius D, Zetterberg R, Larsson H, Lichtenstein P, Andreassen OA, Werge T, Buil A, Landén M, Sullivan PF, Lu Y (2025)
Genetic insights into psychotic major depressive disorder: bridging the mood-psychotic disorder spectrum
EBioMedicine, 112, 105576
DOI 10.1016/j.ebiom.2025.105576, PubMed 39889373

O'Connell KS, Adolfsson R, Andlauer TFM, Bauer M, Baune B, Biernacka JM, Carpiniello B, Cichon S, Craddock N, Cuellar-Barboza AB, Dannlowski U, Degenhardt F, Dikeos D, Ferentinos P, Forstner AJ, Frye MA, Fullerton JM, Grigoroiu-Serbanescu M, Guzman-Parra J, Jones L, Jonsson L, Kircher T, Kogevinas M, Landén M, Lissowska J et al. (2025)
New Genomics Discoveries Across the Bipolar Disorder Spectrum Implicate Neurobiological and Developmental Pathways
Biol Psychiatry, 98 (4), 302-310
DOI 10.1016/j.biopsych.2025.05.020, PubMed 40456304

O'Connell KS, Koromina M, van der Veen T, Boltz T, David FS, Yang JMK, Lin KH, Wang X, Coleman JRI, Mitchell BL, McGrouther CC, Rangan AV, Lind PA, Koch E, Harder A, Parker N, Bendl J, Adorjan K, Agerbo E, Albani D, Alemany S, Alliey-Rodriguez N, Als TD, Andlauer TFM, Antoniou A et al. (2025)
Genomics yields biological and phenotypic insights into bipolar disorder
Nature, 639 (8056), 968-975
DOI 10.1038/s41586-024-08468-9, PubMed 39843750

Rask SM, Solismaa A, Ahola-Olli A, Molden E, O'Connell KS, Lyytikäinen LP, Mononen N, Lehtimäki T, Kampman O (2025)
Meta-analyses of clozapine, norclozapine levels and their ratio across three genome wide association studies
Transl Psychiatry, 15 (1), 431
DOI 10.1038/s41398-025-03649-0, PubMed 41136382

Shadrin AA, Hindley G, Hagen E, Parker N, Tesfaye M, Jaholkowski P, Rahman Z, Kutrolli G, Fominykh V, Djurovic S, Smeland OB, O'Connell KS, van der Meer D, Frei O, Andreassen OA, Dale AM (2025)
Distinct patterns of genetic overlap among multimorbidities revealed with trivariate MiXeR
Genome Med, 17 (1), 106
DOI 10.1186/s13073-025-01528-3, PubMed 41023670

Smeland OB, Kutrolli G, Bahrami S, Fominykh V, Parker N, Fuhrer J, Hindley GFL, Rødevand L, Jaholkowski P, Tesfaye M, Parekh P, Elvsåshagen T, Grotzinger AD, Steen NE, van der Meer D, O'Connell KS, Djurovic S, Dale AM, Shadrin AA, Frei O, Andreassen OA (2025)
A genome-wide analysis of the shared genetic risk architecture of complex neurological and psychiatric disorders
Nat Neurosci (in press)
DOI 10.1038/s41593-025-02090-2, PubMed 41219506

Strom NI, Gerring ZF, Galimberti M, Yu D, Halvorsen MW, Abdellaoui A, Rodriguez-Fontenla C, Sealock JM, Bigdeli T, Coleman JR, Mahjani B, Thorp JG, Bey K, Burton CL, Luykx JJ, Zai G, Alemany S, Andre C, Askland KD, Bäckman J, Banaj N, Barlassina C, Nissen JB, Bienvenu OJ, Black D et al. (2025)
Genome-wide analyses identify 30 loci associated with obsessive-compulsive disorder
Nat Genet, 57 (6), 1389-1401
DOI 10.1038/s41588-025-02189-z, PubMed 40360802

van der Meer D, Rahman Z, Ottas A, Parekh P, Kutrolli G, Stinson SE, Koromina M, Rokicki J, Sønderby IE, Parker N, Tesfaye M, Hindley G, Rødevand LN, Koch E, Estonian Biobank Research Team, Steen NE, Berg JP, O'Connell KS, Smeland OB, Frei O, Dale AM, Djurovic S, Lehto K, Alver M, Milani L et al. (2025)
Pleiotropic and sex-specific genetic mechanisms of circulating metabolic markers
Nat Commun, 16 (1), 4961
DOI 10.1038/s41467-025-60058-z, PubMed 40436851

Wiström ED, O'Connell KS, Koch E, Jaholkowski P, Hindley GFL, Steen NE, Parekh P, Charge Consortium, Frei O, Parker N, Shadrin A, Djurovic S, Dale A, Andreassen OA, Smeland OB (2025)
The genetic overlap between major depressive disorder, white blood cell counts and interleukin 6
J Affect Disord Rep, 20
DOI 10.1016/j.jadr.2025.100889, PubMed 41306196

Publications 2024

Andreou D, Steen NE, Mørch-Johnsen L, Jørgensen KN, Wortinger LA, Barth C, Szabo A, O'Connell KS, Lekva T, Hjell G, Johansen IT, Ormerod MBEG, Haukvik UK, Aukrust P, Djurovic S, Yolken RH, Andreassen OA, Ueland T, Agartz I (2024)
Toxoplasma gondii infection associated with inflammasome activation and neuronal injury
Sci Rep, 14 (1), 5327
DOI 10.1038/s41598-024-55887-9, PubMed 38438515

Bahrami S, Nordengen K, Rokicki J, Shadrin AA, Rahman Z, Smeland OB, Jaholkowski PP, Parker N, Parekh P, O'Connell KS, Elvsåshagen T, Toft M, Djurovic S, Dale AM, Westlye LT, Kaufmann T, Andreassen OA (2024)
The genetic landscape of basal ganglia and implications for common brain disorders
Nat Commun, 15 (1), 8476
DOI 10.1038/s41467-024-52583-0, PubMed 39353893

Frei O, Hindley G, Shadrin AA, van der Meer D, Akdeniz BC, Hagen E, Cheng W, O'Connell KS, Bahrami S, Parker N, Smeland OB, Holland D, Schizophrenia Working Group of the Psychiatric Genomics Consortium, de Leeuw C, Posthuma D, Andreassen OA, Dale AM (2024)
Improved functional mapping of complex trait heritability with GSA-MiXeR implicates biologically specific gene sets
Nat Genet, 56 (6), 1310-1318
DOI 10.1038/s41588-024-01771-1, PubMed 38831010

Hindley G, Drange OK, Lin A, Kutrolli G, Shadrin AA, Parker N, O'Connell KS, Rødevand L, Cheng W, Bahrami S, Karadag N, Holen B, Jaholkowski P, Woldeyohannes MT, Djurovic S, Dale AM, Frei O, Ueland T, Smeland OB, Andreassen OA (2024)
Corrigendum to "Cross-trait genome-wide association analysis of C-reactive protein level and psychiatric disorders" [Psychoneuroendocrinology 157 (2023) 106368]
Psychoneuroendocrinology, 162, 106980
DOI 10.1016/j.psyneuen.2024.106980, PubMed 38336601

Holmgren A, Akkouh I, O'Connell KS, Osete JR, Bjørnstad PM, Djurovic S, Hughes T (2024)
Bipolar patients display stoichiometric imbalance of gene expression in post-mortem brain samples
Mol Psychiatry, 29 (4), 1128-1138
DOI 10.1038/s41380-023-02398-0, PubMed 38351171

Jaholkowski P, Bahrami S, Fominykh V, Hindley GFL, Tesfaye M, Parekh P, Parker N, Filiz TT, Nordengen K, Hagen E, Koch E, Bakken NR, Frei E, Birkenæs V, Rahman Z, Frei O, Haavik J, Djurovic S, Dale AM, Smeland OB, O'Connell KS, Shadrin AA, Andreassen OA (2024)
Charting the shared genetic architecture of Alzheimer's disease, cognition, and educational attainment, and associations with brain development
Neurobiol Dis, 203, 106750
DOI 10.1016/j.nbd.2024.106750, PubMed 39608471

Karadag N, Hagen E, Shadrin AA, van der Meer D, O'Connell KS, Rahman Z, Kutrolli G, Parker N, Bahrami S, Fominykh V, Heuser K, Taubøll E, Steen NE, Djurovic S, Dale AM, Frei O, Andreassen OA, Smeland OB (2024)
Dissecting the Shared Genetic Architecture of Common Epilepsies With Cortical Brain Morphology
Neurol Genet, 10 (3), e200143
DOI 10.1212/NXG.0000000000200143, PubMed 38817246

Karadag N, Hagen E, Shadrin AA, van der Meer D, O'Connell KS, Rahman Z, Kutrolli G, Parker N, Bahrami S, Fominykh V, Heuser K, Taubøll E, Ueland T, Steen NE, Djurovic S, Dale AM, Frei O, Andreassen OA, Smeland OB (2024)
Unraveling the shared genetics of common epilepsies and general cognitive ability
Seizure, 122, 105-112
DOI 10.1016/j.seizure.2024.09.016, PubMed 39388989

Koch E, Kämpe A, Alver M, Sigurðarson S, Einarsson G, Partanen J, Smith RL, Jaholkowski P, Taipale H, Lähteenvuo M, Steen NE, Smeland OB, Djurovic S, Molden E, FinnGen, Estonian Biobank Research Team, Sigurdsson E, Stefánsson H, Stefánsson K, Palotie A, Milani L, O'Connell KS, Andreassen OA (2024)
Polygenic liability for antipsychotic dosage and polypharmacy - a real-world registry and biobank study
Neuropsychopharmacology, 49 (7), 1113-1119
DOI 10.1038/s41386-023-01792-0, PubMed 38184734

Koch E, Pardiñas AF, O'Connell KS, Selvaggi P, Camacho Collados J, Babic A, Marshall SE, Van der Eycken E, Angulo C, Lu Y, Sullivan PF, Dale AM, Molden E, Posthuma D, White N, Schubert A, Djurovic S, Heimer H, Stefánsson H, Stefánsson K, Werge T, Sønderby I, O'Donovan MC, Walters JTR, Milani L et al. (2024)
How Real-World Data Can Facilitate the Development of Precision Medicine Treatment in Psychiatry
Biol Psychiatry, 96 (7), 543-551
DOI 10.1016/j.biopsych.2024.01.001, PubMed 38185234

Lenk HÇ, Koch E, O'Connell KS, Smith RL, Akkouh IA, Djurovic S, Andreassen OA, Molden E (2024)
Genome-wide association analysis of treatment resistant schizophrenia for variant discovery and polygenic assessment
Hum Genomics, 18 (1), 108
DOI 10.1186/s40246-024-00673-x, PubMed 39334510

Lenk HÇ, Smith RL, O'Connell KS, Andreassen OA, Molden E (2024)
Rapid Metabolism Underlying Subtherapeutic Serum Levels of Atypical Antipsychotics Preceding Clozapine Treatment: A Retrospective Analysis of Real-World Data
CNS Drugs, 38 (6), 473-480
DOI 10.1007/s40263-024-01079-y, PubMed 38635089

Smith RL, Wollmann BM, Størset E, Lenk HÇ, O'Connell KS, Kristiansen MK, Ingelman-Sundberg M, Molden E (2024)
Effect of the NFIB rs28379954 T>C polymorphism on CYP2D6-catalyzed metabolism of solanidine
Clin Transl Sci, 17 (2), e13743
DOI 10.1111/cts.13743, PubMed 38385986

Szabo A, O'Connell KS, Akkouh IA, Ueland T, Sønderby IE, Hope S, Røe AB, Dønnum MS, Sjaastad I, Steen NE, Ueland T, Sæther LS, Osete JR, Andreassen OA, Nærland T, Djurovic S (2024)
Elevated levels of peripheral and central nervous system immune markers reflect innate immune dysregulation in autism spectrum disorder
Psychiatry Res, 342, 116245
DOI 10.1016/j.psychres.2024.116245, PubMed 39481220

Tesfaye M, Jaholkowski P, Shadrin AA, van der Meer D, Hindley GFL, Holen B, Parker N, Parekh P, Birkenæs V, Rahman Z, Bahrami S, Kutrolli G, Frei O, Djurovic S, Dale AM, Smeland OB, O'Connell KS, Andreassen OA (2024)
Identification of novel genomic loci for anxiety symptoms and extensive genetic overlap with psychiatric disorders
Psychiatry Clin Neurosci, 78 (12), 783-791
DOI 10.1111/pcn.13742, PubMed 39301620

Wootton O, Shadrin AA, Bjella T, Smeland OB, van der Meer D, Frei O, O'Connell KS, Ueland T, Andreassen OA, Stein DJ, Dalvie S (2024)
Genomic insights into the shared and distinct genetic architecture of cognitive function and schizophrenia
Sci Rep, 14 (1), 15356
DOI 10.1038/s41598-024-66085-y, PubMed 38961113

Publications 2023

Askeland RB, Hannigan LJ, O'Connell KS, Corfield EC, Frei O, Thapar A, Smith GD, Reichborn-Kjennerud T, Andreassen OA, Ask H, Havdahl A (2023)
Developmental manifestations of polygenic risk for bipolar disorder from infancy to middle childhood
Transl Psychiatry, 13 (1), 222
DOI 10.1038/s41398-023-02522-2, PubMed 37353490

Cheng W, Parker N, Karadag N, Koch E, Hindley G, Icick R, Shadrin A, O'Connell KS, Bjella T, Bahrami S, Rahman Z, Tesfaye M, Jaholkowski P, Rødevand L, Holen B, Lagerberg TV, Steen NE, Djurovic S, Dale AM, Frei O, Smeland OB, Andreassen OA (2023)
The relationship between cannabis use, schizophrenia, and bipolar disorder: a genetically informed study
Lancet Psychiatry, 10 (6), 441-451
DOI 10.1016/S2215-0366(23)00143-8, PubMed 37208114

Hindley G, Drange OK, Lin A, Kutrolli G, Shadrin AA, Parker N, O'Connell KS, Rødevand L, Cheng W, Bahrami S, Karadag N, Holen B, Jaholkowski P, Woldeyohannes MT, Djurovic S, Dale AM, Frei O, Ueland T, Smeland OB, Andreassen OA (2023)
Cross-trait genome-wide association analysis of C-reactive protein level and psychiatric disorders
Psychoneuroendocrinology, 157, 106368
DOI 10.1016/j.psyneuen.2023.106368, PubMed 37659117

Hindley G, Shadrin AA, van der Meer D, Parker N, Cheng W, O'Connell KS, Bahrami S, Lin A, Karadag N, Holen B, Bjella T, Deary IJ, Davies G, Hill WD, Bressler J, Seshadri S, Fan CC, Ueland T, Djurovic S, Smeland OB, Frei O, Dale AM, Andreassen OA (2023)
Multivariate genetic analysis of personality and cognitive traits reveals abundant pleiotropy
Nat Hum Behav, 7 (9), 1584-1600
DOI 10.1038/s41562-023-01630-9, PubMed 37365406

Holen B, Kutrolli G, Shadrin AA, Icick R, Hindley G, Rødevand L, O'Connell KS, Frei O, Parker N, Tesfaye M, Deak JD, Jahołkowski P, Dale AM, Djurovic S, Andreassen OA, Smeland OB (2023)
Genome-wide analyses reveal shared genetic architecture and novel risk loci between opioid use disorder and general cognitive ability
Drug Alcohol Depend, 256, 111058
DOI 10.1016/j.drugalcdep.2023.111058, PubMed 38244365

Holen B, Shadrin AA, Icick R, Filiz TT, Hindley G, Rødevand L, O'Connell KS, Hagen E, Frei O, Bahrami S, Cheng W, Parker N, Tesfaye M, Jahołkowski P, Karadag N, Dale AM, Djurovic S, Smeland OB, Andreassen OA (2023)
Genome-wide analyses reveal novel opioid use disorder loci and genetic overlap with schizophrenia, bipolar disorder, and major depression
Addict Biol, 28 (6), e13282
DOI 10.1111/adb.13282, PubMed 37252880

Jaholkowski P, Hindley GFL, Shadrin AA, Tesfaye M, Bahrami S, Nerhus M, Rahman Z, O'Connell KS, Holen B, Parker N, Cheng W, Lin A, Rødevand L, Karadag N, Frei O, Djurovic S, Dale AM, Smeland OB, Andreassen OA (2023)
Genome-wide Association Analysis of Schizophrenia and Vitamin D Levels Shows Shared Genetic Architecture and Identifies Novel Risk Loci
Schizophr Bull, 49 (6), 1654-1664
DOI 10.1093/schbul/sbad063, PubMed 37163672

Jaholkowski P, Shadrin AA, Jangmo A, Frei E, Tesfaye M, Hindley GFL, Haram M, Rahman Z, Athanasiu L, Bakken NR, Holen B, Fominykh V, Kutrolli G, Parekh P, Parker N, Rødevand L, Birkenæs V, Djurovic S, Frei O, O'Connell KS, Smeland OB, Tesli M, Andreassen OA (2023)
Associations Between Symptoms of Premenstrual Disorders and Polygenic Liability for Major Psychiatric Disorders
JAMA Psychiatry, 80 (7), 738-742
DOI 10.1001/jamapsychiatry.2023.1137, PubMed 37163253

Jensen SB, Sheikh MA, Akkouh IA, Szabo A, O'Connell KS, Lekva T, Engh JA, Agartz I, Elvsåshagen T, Ormerod MBEG, Weibell MA, Johnsen E, Kroken RA, Melle I, Drange OK, Nærland T, Vaaler AE, Westlye LT, Aukrust P, Djurovic S, Eiel Steen N, Andreassen OA, Ueland T (2023)
Elevated Systemic Levels of Markers Reflecting Intestinal Barrier Dysfunction and Inflammasome Activation Are Correlated in Severe Mental Illness
Schizophr Bull, 49 (3), 635-645
DOI 10.1093/schbul/sbac191, PubMed 36462169

Karadag N, Shadrin AA, O'Connell KS, Hindley GFL, Rahman Z, Parker N, Bahrami S, Fominykh V, Cheng W, Holen B, Alvestad S, Taubøll E, Steen NE, Djurovic S, Dale AM, Frei O, Andreassen OA, Smeland OB (2023)
Identification of novel genomic risk loci shared between common epilepsies and psychiatric disorders
Brain, 146 (8), 3392-3403
DOI 10.1093/brain/awad038, PubMed 36757824

O'Connell KS, Koch E, Lenk HÇ, Akkouh IA, Hindley G, Jaholkowski P, Smith RL, Holen B, Shadrin AA, Frei O, Smeland OB, Steen NE, Dale AM, Molden E, Djurovic S, Andreassen OA (2023)
Polygenic overlap with body-mass index improves prediction of treatment-resistant schizophrenia
Psychiatry Res, 325, 115217
DOI 10.1016/j.psychres.2023.115217, PubMed 37146461

Parker N, Cheng W, Hindley GFL, O'Connell KS, Karthikeyan S, Holen B, Shadrin AA, Rahman Z, Karadag N, Bahrami S, Lin A, Steen NE, Ueland T, Aukrust P, Djurovic S, Dale AM, Smeland OB, Frei O, Andreassen OA (2023)
Genetic Overlap Between Global Cortical Brain Structure, C-Reactive Protein, and White Blood Cell Counts
Biol Psychiatry, 95 (1), 62-71
DOI 10.1016/j.biopsych.2023.06.008, PubMed 37348803

Steen NE, Rahman Z, Szabo A, Hindley GFL, Parker N, Cheng W, Lin A, O'Connell KS, Sheikh MA, Shadrin A, Bahrami S, Karthikeyan S, Hoseth EZ, Dale AM, Aukrust P, Smeland OB, Ueland T, Frei O, Djurovic S, Andreassen OA (2023)
Shared Genetic Loci Between Schizophrenia and White Blood Cell Counts Suggest Genetically Determined Systemic Immune Abnormalities
Schizophr Bull, 49 (5), 1345-1354
DOI 10.1093/schbul/sbad082, PubMed 37319439

Tesfaye M, Jaholkowski P, Hindley GFL, Shadrin AA, Rahman Z, Bahrami S, Lin A, Holen B, Parker N, Cheng W, Rødevand L, Frei O, Djurovic S, Dale AM, Smeland OB, O'Connell KS, Andreassen OA (2023)
Shared genetic architecture between irritable bowel syndrome and psychiatric disorders reveals molecular pathways of the gut-brain axis
Genome Med, 15 (1), 60
DOI 10.1186/s13073-023-01212-4, PubMed 37528461

Publications 2022

Bahrami S, Hindley G, Winsvold BS, O'Connell KS, Frei O, Shadrin A, Cheng W, Bettella F, Rødevand L, Odegaard KJ, Fan CC, Pirinen MJ, Hautakangas HM, HUNT All-In Headache, Dale AM, Djurovic S, Smeland OB, Andreassen OA (2022)
Dissecting the shared genetic basis of migraine and mental disorders using novel statistical tools
Brain, 145 (1), 142-153
DOI 10.1093/brain/awab267, PubMed 34273149

Cheng W, van der Meer D, Parker N, Hindley G, O'Connell KS, Wang Y, Shadrin AA, Alnæs D, Bahrami S, Lin A, Karadag N, Holen B, Fernandez-Cabello S, Fan CC, Dale AM, Djurovic S, Westlye LT, Frei O, Smeland OB, Andreassen OA (2022)
Shared genetic architecture between schizophrenia and subcortical brain volumes implicates early neurodevelopmental processes and brain development in childhood
Mol Psychiatry, 27 (12), 5167-5176
DOI 10.1038/s41380-022-01751-z, PubMed 36100668

Hindley G, Frei O, Shadrin AA, Cheng W, O'Connell KS, Icick R, Parker N, Bahrami S, Karadag N, Roelfs D, Holen B, Lin A, Fan CC, Djurovic S, Dale AM, Smeland OB, Andreassen OA (2022)
Charting the Landscape of Genetic Overlap Between Mental Disorders and Related Traits Beyond Genetic Correlation
Am J Psychiatry, 179 (11), 833-843
DOI 10.1176/appi.ajp.21101051, PubMed 36069018

Hindley G, O'Connell KS, Rahman Z, Frei O, Bahrami S, Shadrin A, Høegh MC, Cheng W, Karadag N, Lin A, Rødevand L, Fan CC, Djurovic S, Lagerberg TV, Dale AM, Smeland OB, Andreassen OA (2022)
The shared genetic basis of mood instability and psychiatric disorders: A cross-trait genome-wide association analysis
Am J Med Genet B Neuropsychiatr Genet, 189 (6), 207-218
DOI 10.1002/ajmg.b.32907, PubMed 35841185

Kappel DB, Legge SE, Hubbard L, Willcocks IR, O'Connell KS, Smith RL, Molden E, Andreassen OA, King A, Jansen J, Helthuis M, Owen MJ, O'Donovan MC, Walters JTR, Pardiñas AF (2022)
Genomic Stratification of Clozapine Prescription Patterns Using Schizophrenia Polygenic Scores
Biol Psychiatry, 93 (2), 149-156
DOI 10.1016/j.biopsych.2022.07.014, PubMed 36244804

Lenk HÇ, Løvsletten Smith R, O'Connell KS, Jukić MM, Kringen MK, Andreassen OA, Ingelman-Sundberg M, Molden E (2022)
Impact of NFIB and CYP1A variants on clozapine serum concentration-A retrospective naturalistic cohort study on 526 patients with known smoking habits
Clin Transl Sci, 16 (1), 62-72
DOI 10.1111/cts.13422, PubMed 36152308

Motazedi E, Cheng W, Thomassen JQ, Frei O, Rongve A, Athanasiu L, Bahrami S, Shadrin A, Ulstein I, Stordal E, Brækhus A, Saltvedt I, Sando SB, O'Connell KS, Hindley G, van der Meer D, Bergh S, Nordestgaard BG, Tybjærg-Hansen A, Bråthen G, Pihlstrøm L, Djurovic S, Frikke-Schmidt R, Fladby T, Aarsland D et al. (2022)
Using Polygenic Hazard Scores to Predict Age at Onset of Alzheimer's Disease in Nordic Populations
J Alzheimers Dis, 88 (4), 1533-1544
DOI 10.3233/JAD-220174, PubMed 35848024

Sheikh MA, O'Connell KS, Lekva T, Szabo A, Akkouh IA, Osete JR, Agartz I, Engh JA, Andreou D, Boye B, Bøen E, Elvsåshagen T, Hope S, Frogner Werner MC, Joa I, Johnsen E, Kroken RA, Lagerberg TV, Melle I, Drange OK, Morken G, Nærland T, Sørensen K, Vaaler AE, Weibell MA et al. (2022)
Systemic Cell Adhesion Molecules in Severe Mental Illness: Potential Role of Intercellular CAM-1 in Linking Peripheral and Neuroinflammation
Biol Psychiatry, 93 (2), 187-196
DOI 10.1016/j.biopsych.2022.06.029, PubMed 36182530

Torgersen K, Rahman Z, Bahrami S, Hindley GFL, Parker N, Frei O, Shadrin A, O'Connell KS, Tesli M, Smeland OB, Munkhaugen J, Djurovic S, Dammen T, Andreassen OA (2022)
Shared genetic loci between depression and cardiometabolic traits
PLoS Genet, 18 (5), e1010161
DOI 10.1371/journal.pgen.1010161, PubMed 35560157

Publications 2021

Bahrami S, Shadrin A, Frei O, O'Connell KS, Bettella F, Krull F, Fan CC, Røssberg JI, Hindley G, Ueland T, Dale AM, Djurovic S, Steen NE, Smeland OB, Andreassen OA (2021)
Genetic loci shared between major depression and intelligence with mixed directions of effect
Nat Hum Behav, 5 (6), 795-801
DOI 10.1038/s41562-020-01031-2, PubMed 33462475

Cheng W, Frei O, van der Meer D, Wang Y, O'Connell KS, Chu Y, Bahrami S, Shadrin AA, Alnæs D, Hindley GFL, Lin A, Karadag N, Fan CC, Westlye LT, Kaufmann T, Molden E, Dale AM, Djurovic S, Smeland OB, Andreassen OA (2021)
Genetic Association Between Schizophrenia and Cortical Brain Surface Area and Thickness
JAMA Psychiatry, 78 (9), 1020-1030
DOI 10.1001/jamapsychiatry.2021.1435, PubMed 34160554

Fjukstad KK, Athanasiu L, Bahrami S, O'Connell KS, van der Meer D, Bettella F, Dieset I, Steen NE, Djurovic S, Spigset O, Andreassen OA (2021)
Genetic variants associated with cardiometabolic abnormalities during treatment with selective serotonin reuptake inhibitors: a genome-wide association study
Pharmacogenomics J, 21 (5), 574-585
DOI 10.1038/s41397-021-00234-8, PubMed 33824429

Gurholt TP, Kaufmann T, Frei O, Alnæs D, Haukvik UK, van der Meer D, Moberget T, O'Connell KS, Leinhard OD, Linge J, Simon R, Smeland OB, Sønderby IE, Winterton A, Steen NE, Westlye LT, Andreassen OA (2021)
Population-based body-brain mapping links brain morphology with anthropometrics and body composition
Transl Psychiatry, 11 (1), 295
DOI 10.1038/s41398-021-01414-7, PubMed 34006848

Hindley G, Bahrami S, Steen NE, O'Connell KS, Frei O, Shadrin A, Bettella F, Rødevand L, Fan CC, Dale AM, Djurovic S, Smeland OB, Andreassen OA (2021)
Characterising the shared genetic determinants of bipolar disorder, schizophrenia and risk-taking
Transl Psychiatry, 11 (1), 466
DOI 10.1038/s41398-021-01576-4, PubMed 34497263

Kalman JL, Olde Loohuis LM, Vreeker A, McQuillin A, Stahl EA, Ruderfer D, Grigoroiu-Serbanescu M, Panagiotaropoulou G, Ripke S, Bigdeli TB, Stein F, Meller T, Meinert S, Pelin H, Streit F, Papiol S, Adams MJ, Adolfsson R, Adorjan K, Agartz I, Aminoff SR, Anderson-Schmidt H, Andreassen OA, Ardau R, Aubry JM et al. (2021)
Characterisation of age and polarity at onset in bipolar disorder
Br J Psychiatry, 219 (6), 659-669
DOI 10.1192/bjp.2021.102, PubMed 35048876

Krull F, Akkouh I, Hughes T, Bettella F, Athanasiu L, Smeland OB, O'Connell KS, Brattbakk HR, Steen VM, Steen NE, Djurovic S, Andreassen OA (2021)
Dose-dependent transcriptional effects of lithium and adverse effect burden in a psychiatric cohort
Prog Neuropsychopharmacol Biol Psychiatry, 112, 110408
DOI 10.1016/j.pnpbp.2021.110408, PubMed 34320404

Mullins N, Forstner AJ, O'Connell KS, Coombes B, Coleman JRI, Qiao Z, Als TD, Bigdeli TB, Børte S, Bryois J, Charney AW, Drange OK, Gandal MJ, Hagenaars SP, Ikeda M, Kamitaki N, Kim M, Krebs K, Panagiotaropoulou G, Schilder BM, Sloofman LG, Steinberg S, Trubetskoy V, Winsvold BS, Won HH et al. (2021)
Genome-wide association study of more than 40,000 bipolar disorder cases provides new insights into the underlying biology
Nat Genet, 53 (6), 817-829
DOI 10.1038/s41588-021-00857-4, PubMed 34002096

O'Connell KS, Coombes BJ (2021)
Genetic contributions to bipolar disorder: current status and future directions
Psychol Med, 51 (13), 2156-2167
DOI 10.1017/S0033291721001252, PubMed 33879273

O'Connell KS, Frei O, Bahrami S, Smeland OB, Bettella F, Cheng W, Chu Y, Hindley G, Lin A, Shadrin A, Barrett EA, Lagerberg TV, Steen NE, Dale AM, Djurovic S, Andreassen OA (2021)
Characterizing the Genetic Overlap Between Psychiatric Disorders and Sleep-Related Phenotypes
Biol Psychiatry, 90 (9), 621-631
DOI 10.1016/j.biopsych.2021.07.007, PubMed 34482950

O'Connell KS, Sønderby IE, Frei O, van der Meer D, Athanasiu L, Smeland OB, Alnæs D, Kaufmann T, Westlye LT, Steen VM, Andreassen OA, Hughes T, Djurovic S (2021)
Association between complement component 4A expression, cognitive performance and brain imaging measures in UK Biobank
Psychol Med, 52 (15), 1-11 (in press)
DOI 10.1017/S0033291721000179, PubMed 33653435

Reis de Assis D, Szabo A, Requena Osete J, Puppo F, O'Connell KS, A Akkouh I, Hughes T, Frei E, A Andreassen O, Djurovic S (2021)
Using iPSC Models to Understand the Role of Estrogen in Neuron-Glia Interactions in Schizophrenia and Bipolar Disorder
Cells, 10 (2)
DOI 10.3390/cells10020209, PubMed 33494281

Rødevand L, Bahrami S, Frei O, Chu Y, Shadrin A, O'Connell KS, Smeland OB, Elvsåshagen T, Hindley GFL, Djurovic S, Dale AM, Lagerberg TV, Steen NE, Andreassen OA (2021)
Extensive bidirectional genetic overlap between bipolar disorder and cardiovascular disease phenotypes
Transl Psychiatry, 11 (1), 407
DOI 10.1038/s41398-021-01527-z, PubMed 34301917

Szabo A, O'Connell KS, Ueland T, Sheikh MA, Agartz I, Andreou D, Aukrust P, Boye B, Bøen E, Drange OK, Elvsåshagen T, Engh JA, Hope S, Collier Høegh M, Joa I, Johnsen E, Kroken RA, Vik Lagerberg T, Lekva T, Malt UF, Melle I, Morken G, Nærland T, Steen VM, Sørensen K et al. (2021)
Increased circulating IL-18 levels in severe mental disorders indicate systemic inflammasome activation
Brain Behav Immun, 99, 299-306
DOI 10.1016/j.bbi.2021.10.017, PubMed 34758379

Wiström ED, O'Connell KS, Karadag N, Bahrami S, Hindley GFL, Lin A, Cheng W, Steen NE, Shadrin A, Frei O, Djurovic S, Dale AM, Andreassen OA, Smeland OB (2021)
Genome-wide analysis reveals genetic overlap between alcohol use behaviours, schizophrenia and bipolar disorder and identifies novel shared risk loci
Addiction, 117 (3), 600-610
DOI 10.1111/add.15680, PubMed 34472679

Publications 2020

Cuellar-Partida G, Tung JY, Eriksson N, Albrecht E, Aliev F, Andreassen OA, Barroso I, Beckmann JS, Boks MP, Boomsma DI, Boyd HA, Breteler MMB, Campbell H, Chasman DI, Cherkas LF, Davies G, de Geus EJC, Deary IJ, Deloukas P, Dick DM, Duffy DL, Eriksson JG, Esko T, Feenstra B, Geller F et al. (2020)
Genome-wide association study identifies 48 common genetic variants associated with handedness
Nat Hum Behav, 5 (1), 59-70
DOI 10.1038/s41562-020-00956-y, PubMed 32989287

Shadrin AA, Frei O, Smeland OB, Bettella F, O'Connell KS, Gani O, Bahrami S, Uggen TKE, Djurovic S, Holland D, Andreassen OA, Dale AM (2020)
Phenotype-specific differences in polygenicity and effect size distribution across functional annotation categories revealed by AI-MiXeR
Bioinformatics, 36 (18), 4749-4756
DOI 10.1093/bioinformatics/btaa568, PubMed 32539089

Shadrin AA, Mucha S, Ellinghaus D, Makarious MB, Blauwendraat C, Sreelatha AAK, Heras-Garvin A, Ding J, Hammer M, Foubert-Samier A, Meissner WG, Rascol O, Pavy-Le Traon A, Frei O, O'Connell KS, Bahrami S, Schreiber S, Lieb W, Müller-Nurasyid M, Schminke U, Homuth G, Schmidt CO, Nöthen MM, Hoffmann P, Gieger C et al. (2020)
Shared Genetics of Multiple System Atrophy and Inflammatory Bowel Disease
Mov Disord, 36 (2), 449-459
DOI 10.1002/mds.28338, PubMed 33107653

Smeland OB, Shadrin A, Bahrami S, Broce I, Tesli M, Frei O, Wirgenes KV, O'Connell KS, Krull F, Bettella F, Steen NE, Sugrue L, Wang Y, Svenningsson P, Sharma M, Pihlstrøm L, Toft M, O'Donovan M, Djurovic S, Desikan R, Dale AM, Andreassen OA (2020)
Genome-wide Association Analysis of Parkinson's Disease and Schizophrenia Reveals Shared Genetic Architecture and Identifies Novel Risk Loci
Biol Psychiatry, 89 (3), 227-235
DOI 10.1016/j.biopsych.2020.01.026, PubMed 32201043

van der Meer D, Frei O, Kaufmann T, Chen CH, Thompson WK, O'Connell KS, Monereo Sánchez J, Linden DEJ, Westlye LT, Dale AM, Andreassen OA (2020)
Quantifying the Polygenic Architecture of the Human Cerebral Cortex: Extensive Genetic Overlap between Cortical Thickness and Surface Area
Cereb Cortex, 30 (10), 5597-5603
DOI 10.1093/cercor/bhaa146, PubMed 32483632

Publications 2019

Frei O, Holland D, Smeland OB, Shadrin AA, Fan CC, Maeland S, O'Connell KS, Wang Y, Djurovic S, Thompson WK, Andreassen OA, Dale AM (2019)
Bivariate causal mixture model quantifies polygenic overlap between complex traits beyond genetic correlation
Nat Commun, 10 (1), 2417
DOI 10.1038/s41467-019-10310-0, PubMed 31160569

O'Connell KS, McGregor NW, Emsley R, Seedat S, Warnich L (2019)
The Potential Role of Regulatory Genes (DNMT3A, HDAC5, and HDAC9) in Antipsychotic Treatment Response in South African Schizophrenia Patients
Front Genet, 10, 641
DOI 10.3389/fgene.2019.00641, PubMed 31354789

O'Connell KS, Shadrin A, Bahrami S, Smeland OB, Bettella F, Frei O, Krull F, Askeland RB, Walters GB, Davíðsdóttir K, Haraldsdóttir GS, Guðmundsson ÓÓ, Stefánsson H, Fan CC, Steen NE, Reichborn-Kjennerud T, Dale AM, Stefánsson K, Djurovic S, Andreassen OA (2019)
Identification of genetic overlap and novel risk loci for attention-deficit/hyperactivity disorder and bipolar disorder
Mol Psychiatry, 26 (8), 4055-4065
DOI 10.1038/s41380-019-0613-z, PubMed 31792363

O'Connell KS, Shadrin A, Smeland OB, Bahrami S, Frei O, Bettella F, Krull F, Fan CC, Askeland RB, Knudsen GPS, Halmøy A, Steen NE, Ueland T, Walters GB, Davíðsdóttir K, Haraldsdóttir GS, Guðmundsson ÓÓ, Stefánsson H, Reichborn-Kjennerud T, Haavik J, Dale AM, Stefánsson K, Djurovic S, Andreassen OA (2019)
Identification of Genetic Loci Shared Between Attention-Deficit/Hyperactivity Disorder, Intelligence, and Educational Attainment
Biol Psychiatry, 87 (12), 1052-1062
DOI 10.1016/j.biopsych.2019.11.015, PubMed 32061372

Publications 2018

McGregor N, Thompson N, O'Connell KS, Emsley R, van der Merwe L, Warnich L (2018)
Modification of the association between antipsychotic treatment response and childhood adversity by MMP9 gene variants in a first-episode schizophrenia cohort
Psychiatry Res, 262, 141-148
DOI 10.1016/j.psychres.2018.01.044, PubMed 29448178

O'Connell KS, McGregor NW, Lochner C, Emsley R, Warnich L (2018)
The genetic architecture of schizophrenia, bipolar disorder, obsessive-compulsive disorder and autism spectrum disorder
Mol Cell Neurosci, 88, 300-307
DOI 10.1016/j.mcn.2018.02.010, PubMed 29505902

O'Connell KS, McGregor NW, Malhotra A, Lencz T, Emsley R, Warnich L (2018)
Variation within voltage-gated calcium channel genes and antipsychotic treatment response in a South African first episode schizophrenia cohort
Pharmacogenomics J, 19 (1), 109-114
DOI 10.1038/s41397-018-0033-5, PubMed 30032160

O'Connell KS, Swart M, McGregor NW, Dandara C, Warnich L (2018)
Pharmacogenetics of Antiretroviral Drug Response and Pharmacokinetic Variations in Indigenous South African Populations
OMICS, 22 (9), 589-597
DOI 10.1089/omi.2018.0117, PubMed 30235109