Blar i Bergen Open Research Archive på forfatter "Frei, Oleksandr"
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Genome-wide analysis of anorexia nervosa and major psychiatric disorders and related traits reveals genetic overlap and identifies novel risk loci for anorexia nervosa
Bang, Lasse; Bahrami, Shahram; Hindley, Guy; Smeland, Olav Bjerkehagen; Rødevand, Linn; Jaholkowski, Piotr Pawel; Shadrin, Alexey; O'Connell, Kevin Sean; Frei, Oleksandr; Lin, Aihua; Rahman, Zillur; Cheng, Weiqiu; Parker, Nadine; Fan, Chun C.; Dale, Anders M.; Djurovic, Srdjan; Bulik, Cynthia M.; Andreassen, Ole (Journal article; Peer reviewed, 2023)Anorexia nervosa (AN) is a heritable eating disorder (50–60%) with an array of commonly comorbid psychiatric disorders and related traits. Although significant genetic correlations between AN and psychiatric disorders and ... -
Genome-wide analysis reveals extensive genetic overlap between schizophrenia, bipolar disorder, and intelligence
Smeland, Olav Bjerkehagen; Bahrami, Shahram; Frei, Oleksandr; Shadrin, Alexey A.; O'Connell, Kevin; Savage, Jeanne E.; Watanabe, Kyoko; Krull, Florian; Bettella, Francesco; Steen, Nils Eiel; Ueland, Torill; Posthuma, Danielle; Djurovic, Srdjan; Dale, Anders; Andreassen, Ole Andreas (Peer reviewed; Journal article, 2019)Schizophrenia (SCZ) and bipolar disorder (BD) are severe mental disorders associated with cognitive impairment, which is considered a major determinant of functional outcome. Despite this, the etiology of the cognitive ... -
Genome-wide analysis reveals genetic overlap between alcohol use behaviours, schizophrenia and bipolar disorder and identifies novel shared risk loci
Wiström, Erik David; O'Connell, Kevin Sean; Karadag, Naz; Bahrami, Shahram; Hindley, Guy Frederick Lanyon; Lin, Aihua; Cheng, Weiqiu; Steen, Nils Eiel; Shadrin, Alexey; Frei, Oleksandr; Djurovic, Srdjan; Dale, Anders M.; Andreassen, Ole A.; Smeland, Olav Bjerkehagen (Journal article; Peer reviewed, 2022)Background and aim Schizophrenia (SCZ) and bipolar disorder (BD) have a high comorbidity of alcohol use disorder (AUD), and both comorbid AUD and excessive alcohol consumption (AC) have been linked to greater illness ... -
Genome-wide Association Analysis of Parkinson’s Disease and Schizophrenia Reveals Shared Genetic Architecture and Identifies Novel Risk Loci
Smeland, Olav Bjerkehagen; Shadrin, Alexey A.; Bahrami, Shahram; Broce, Iris J.; Tesli, Martin Steen; Frei, Oleksandr; Wirgenes, Katrine Verena; O`Connell, Kevin; Krull, Florian; Bettella, Francesco; Steen, Nils Eiel; Sugrue, Leo P.; Wang, Yunpeng; Svenningsson, Per; Sharma, Manu; Pihlstrøm, Lasse; Toft, H. Mathias S.; O’Donovan, Michael; Djurovic, Srdjan; Desikan, Rahul S; Dale, Anders M.; Andreassen, Ole Andreas (Journal article; Peer reviewed, 2021)Background Parkinson’s disease (PD) and schizophrenia (SCZ) are heritable brain disorders that involve dysregulation of the dopaminergic system. Epidemiological studies have reported potential comorbidity between the ... -
Genome-wide Association Analysis of Schizophrenia and Vitamin D Levels Shows Shared Genetic Architecture and Identifies Novel Risk Loci
Jaholkowski, Piotr Pawel; Hindley, Guy; Shadrin, Alexey; Tesfaye, Markos; Bahrami, Shahram; Nerhus, Mari; Rahman, Zillur; O'Connell, Kevin Sean; Holen, Børge; Parker, Nadine; Cheng, Weiqiu; Lin, Aihua; Rødevand, Linn; Karadag, Naz; Frei, Oleksandr; Djurovic, Srdjan; Dale, Anders M.; Smeland, Olav Bjerkehagen; Andreassen, Ole (Journal article; Peer reviewed, 2023)Low vitamin D (vitD) levels have been consistently reported in schizophrenia (SCZ) suggesting a role in the etiopathology. However, little is known about the role of underlying shared genetic mechanisms. We applied a ... -
Identification of Genetic Loci Shared Between Attention-Deficit/Hyperactivity Disorder, Intelligence, and Educational Attainment
O`Connell, Kevin; Shadrin, Alexey A.; Smeland, Olav Bjerkehagen; Bahrami, Shahram; Frei, Oleksandr; Bettella, Francesco; Krull, Florian; Fan, Chun C.; Askeland, Ragna Bugge; Knudsen, Gun Peggy Strømstad; Halmøy, Anne; Steen, Nils Eiel; Ueland, Torill; Walters, Bragi; Davíðsdóttir, Katrín; Haraldsdóttir, Gyda S.; Guðmundsson, Ólafur; Stefansson, Hreinn; Reichborn-Kjennerud, Ted; Haavik, Jan; Dale, Anders M.; Stefánsson, Kári; Djurovic, Srdjan; Andreassen, Ole Andreas (Peer reviewed; Journal article, 2020)Background: Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder that is consistently associated with lower levels of educational attainment. A recent large genome-wide association study identified ... -
Identification of genetic loci shared between schizophrenia and the Big Five personality traits
Smeland, Olav Bjerkehagen; Wang, Yunpeng; Lo, Min-Tzu; Li, Wen; Frei, Oleksandr; Witoelar, Aree; Tesli, Martin Steen; Hinds, David A.; Tung, Joyce Y.; Djurovic, Srdjan; Chen, Chi-Hua; Dale, Anders; Andreassen, Ole Andreas (Peer reviewed; Journal article, 2017-05-22)Schizophrenia is associated with differences in personality traits, and recent studies suggest that personality traits and schizophrenia share a genetic basis. Here we aimed to identify specific genetic loci shared between ... -
Identification of genetic overlap and novel risk loci for attention-deficit/hyperactivity disorder and bipolar disorder
O`Connell, Kevin; Shadrin, Alexey A.; Bahrami, Shahram; Smeland, Olav Bjerkehagen; Bettella, Francesco; Frei, Oleksandr; Krull, Florian; Askeland, Ragna Bugge; Walters, Bragi; Davíðsdóttir, Katrín; Haraldsdóttir, Gyða; Guðmundsson, Ólafur; Stefánsson, Hreinn; Fan, Chun C.; Steen, Nils Eiel; Reichborn-Kjennerud, Ted; Dale, Anders; Stefánsson, Kári; Djurovic, Srdjan; Andreassen, Ole Andreas (Peer reviewed; Journal article, 2019)Differential diagnosis between childhood onset attention-deficit/hyperactivity disorder (ADHD) and bipolar disorder (BD) remains a challenge, mainly due to overlapping symptoms and high rates of comorbidity. Despite this, ... -
Identification of novel genomic risk loci shared between common epilepsies and psychiatric disorders
Karadag, Naz; Shadrin, Alexey; O'Connell, Kevin S; Hindley, Guy Frederick Lanyon; Rahman, Zillur; Parker, Nadine; Bahrami, Shahram; Fominykh, Vera; Cheng, Weiqiu; Holen, Børge; Alvestad, Silje; Taubøll, Erik; Steen, Nils Eiel; Djurovic, Srdjan; Dale, Anders M; Frei, Oleksandr; Andreassen, Ole; Smeland, Olav Bjerkehagen (Journal article; Peer reviewed, 2023)Psychiatric disorders and common epilepsies are heritable disorders with a high comorbidity and overlapping symptoms. However, the causative mechanisms underlying this relationship are poorly understood. Here we aimed to ... -
Identification of shared genetic variants between schizophrenia and lung cancer
Zuber, Verena; Jönsson, Erik Gunnar; Frei, Oleksandr; Witoelar, Aree; Thompson, V K; Schork, Andrew J; Bettella, Francesco; Wang, Yunpeng; Djurovic, Srdjan; Smeland, Olav Bjerkehagen; Dieset, Ingrid; Fanous, Ayman H.; Desikan, Rahul S; Küry, Sébastien; Bezieau, Stephane; Dale, Anders M; Mills, Ian Geoffrey; Andreassen, Ole Andreas (Peer reviewed; Journal article, 2018-01-12)Epidemiology studies suggest associations between schizophrenia and cancer. However, the underlying genetic mechanisms are not well understood, and difficult to identify from epidemiological data. We investigated if there ... -
No signs of neurodegenerative effects in 15q11.2 BP1-BP2 copy number variant carriers in the UK Biobank
Bøen, Rune; Kaufmann, Tobias; Frei, Oleksandr; van der Meer, Dennis; Djurovic, Srdjan; Andreassen, Ole; Selmer, Kaja Kristine; Alnæs, Dag; Sønderby, Ida Elken (Journal article; Peer reviewed, 2023)The 15q11.2 BP1-BP2 copy number variant (CNV) is associated with altered brain morphology and risk for atypical development, including increased risk for schizophrenia and learning difficulties for the deletion. However, ... -
Novel loci associated with attention-deficit/hyperactivity disorder are revealed by leveraging polygenic overlap with educational attainment
Shadrin, Alexey A.; Smeland, Olav Bjerkehagen; Zayats, Tetyana; Schork, Andrew J; Frei, Oleksandr; Bettella, Francesco; Witoelar, Aree; Li, Wen; Eriksen, Jon Alm; Krull, Florian; Djurovic, Srdjan; Faraone, Stephen V.; Reichborn-Kjennerud, Ted; Thompson, Wesley K; Johansson, Stefan; Haavik, Jan; Dale, Anders; Wang, Yunpeng; Andreassen, Ole Andreas (Peer reviewed; Journal article, 2018-02)Objective Attention-deficit/hyperactivity disorder (ADHD) is a common and highly heritable psychiatric condition. By exploiting the reported relationship between ADHD and educational attainment (EA), we aimed to improve ... -
Polygenic overlap and shared genetic loci between loneliness, severe mental disorders, and cardiovascular disease risk factors suggest shared molecular mechanisms
Rødevand, Linn; Bahrami, Shahram; Frei, Oleksandr; Lin, Aihua; Gani, Osman; Shadrin, Alexey A.; Smeland, Olav Bjerkehagen; O'Connell, Kevin; Elvsåshagen, Torbjørn; Winterton, Adriano; Quintana, Daniel; Hindley, Guy Frederick Lanyon; Werner, Maren Caroline Frogner; Djurovic, Srdjan; Dale, Anders Martin; Lagerberg, Trine Vik; Steen, Nils Eiel; Andreassen, Ole Andreas (Journal article; Peer reviewed, 2021)Clinical and epidemiological evidence suggest that loneliness is associated with severe mental disorders (SMDs) and increases the risk of cardiovascular disease (CVD). However, the mechanisms underlying the relationship ... -
Polygenic overlap with body-mass index improves prediction of treatment-resistant schizophrenia
O'Connell, Kevin Sean; Koch, Elise; Lenk, Hasan Cagin; Akkouh, Ibrahim Ahmed; Hindley, Guy Frederick Lanyon; Jaholkowski, Piotr Pawel; Smith, Robert Løvsletten; Holen, Børge; Shadrin, Alexey; Frei, Oleksandr; Smeland, Olav Bjerkehagen; Steen, Nils Eiel; Dale, Anders M; Molden, Espen; Djurovic, Srdjan; Andreassen, Ole (Journal article; Peer reviewed, 2023)Treatment resistant schizophrenia (TRS) is characterized by repeated treatment failure with antipsychotics. A recent genome-wide association study (GWAS) of TRS showed a polygenic architecture, but no significant loci were ... -
Shared genetic architecture between irritable bowel syndrome and psychiatric disorders reveals molecular pathways of the gut-brain axis
Woldeyohannes, Markos Tesfaye; Jaholkowski, Piotr Pawel; Hindley, Guy; Shadrin, Alexey; Rahman, Zillur; Bahrami, Shahram; Lin, Aihua; Holen, Børge; Parker, Nadine; Cheng, Weiqiu; Rødevand, Linn; Frei, Oleksandr; Djurovic, Srdjan; Dale, Anders M.; Smeland, Olav Bjerkehagen; O’Connell, Kevin S.; Andreassen, Ole (Journal article; Peer reviewed, 2023-08-01)Background: Irritable bowel syndrome (IBS) often co-occurs with psychiatric and gastrointestinal disorders. A recent genome-wide association study (GWAS) identified several genetic risk variants for IBS. However, most of ... -
Shared genetic architecture between neuroticism, coronary artery disease and cardiovascular risk factors
Torgersen, Kristin Stensland; Bahrami, Shahram; Frei, Oleksandr; Shadrin, Alexey; O'Connell, Kevin Sean; Smeland, Olav Bjerkehagen; Munkhaugen, John; Djurovic, Srdjan; Dammen, Toril; Andreassen, Ole A. (Journal article; Peer reviewed, 2021)Neuroticism is associated with poor health, cardiovascular disease (CVD) risk factors and coronary artery disease (CAD). The conditional/conjunctional false discovery rate method (cond/conjFDR) was applied to genome wide ... -
Shared genetic architecture between schizophrenia and subcortical brain volumes implicates early neurodevelopmental processes and brain development in childhood
Cheng, Weiqiu; van der Meer, Dennis; Parker, Nadine; Hindley, Guy Frederick Lanyon; O'Connell, Kevin Sean; Wang, Yunpeng; Shadrin, Alexey; Alnæs, Dag; Bahrami, Shahram; Lin, Aihua; Karadag, Naz; Holen, Børge; Fernández-Cabello, Sara; Fan, Chun-Chieh; Dale, Anders; Djurovic, Srdjan; Westlye, Lars Tjelta; Frei, Oleksandr; Smeland, Olav Bjerkehagen; Andreassen, Ole (Journal article; Peer reviewed, 2022)Patients with schizophrenia have consistently shown brain volumetric abnormalities, implicating both etiological and pathological processes. However, the genetic relationship between schizophrenia and brain volumetric ... -
The shared genetic basis of mood instability and psychiatric disorders: A cross-trait genome-wide association analysis
Hindley, Guy Frederick Lanyon; O'Connell, Kevin Sean; Rahman, Zillur; Frei, Oleksandr; Bahrami, Shahram; Shadrin, Alexey; Høegh, Margrethe Collier; Cheng, Weiqiu; Karadag, Naz; Lin, Aihua; Rødevand, Linn; Fan, Chun C.; Djurovic, Srdjan; Lagerberg, Trine Vik; Dale, Anders; Smeland, Olav Bjerkehagen; Andreassen, Ole (Journal article; Peer reviewed, 2022)Recent genome-wide association studies of mood instability (MOOD) have found significant positive genetic correlation with major depression (DEP) and weak correlations with other psychiatric disorders. We investigated the ... -
Shared genetic loci between depression and cardiometabolic traits
Torgersen, Kristin Stensland; Rahman, Zillur; Bahrami, Shahram; Hindley, Guy Frederick Lanyon; Parker, Nadine; Frei, Oleksandr; Shadrin, Alexey; O'Connell, Kevin Sean; Tesli, Martin Steen; Smeland, Olav Bjerkehagen; Munkhaugen, John; Djurovic, Srdjan; Dammen, Toril; Andreassen, Ole (Journal article; Peer reviewed, 2022-05-13)Epidemiological and clinical studies have found associations between depression and cardiovascular disease risk factors, and coronary artery disease patients with depression have worse prognosis. The genetic relationship ...