Oleksandr Frei

• Drange, Ole Kristian; Smeland, Olav Bjerkehagen; Shadrin, Alexey A.; Finseth, Per Ivar; Witoelar, Aree; Frei, Oleksandr; Psychiatric Genomic Consortium, Bipolar Disorder Working Group; Wang, Yunpeng; Hassani, Sahar; Djurovic, Srdjan; Dale, Anders & Andreassen, Ole Andreas (2019). Genetic Overlap Between Alzheimer’s Disease and Bipolar Disorder Implicates the MARK2 and VAC14 Genes. Frontiers in Neuroscience.  ISSN 1662-4548.  13 . doi: 10.3389/fnins.2019.00220 Fulltekst i vitenarkiv.
• Drange, Ole Kristian; Smeland, Olav Bjerkehagen; Shadrin, Alexey A.; Finseth, Per Ivar; Witoelar, Aree; Frei, Oleksandr; Wang, Yunpeng; Hassani, Sahar; Djurovic, Srdjan; Dale, Anders M & Andreassen, Ole Andreas (2019). Genetic Overlap Between Alzheimer’s Disease and Bipolar Disorder Implicates the MARK2 and VAC14 Genes. Frontiers in Neuroscience.  ISSN 1662-4548. . doi: 10.3389/fnins.2019.00220 Fulltekst i vitenarkiv.
• Frei, Oleksandr; Holland, Dominic; Smeland, Olav Bjerkehagen; Shadrin, Alexey A.; Fan, Chun Chieh; Maeland, Steffen; O'Connell, Kevin S.; Wang, Yunpeng; Djurovic, Srdjan; Thompson, Wesley Kurt; Andreassen, Ole Andreas & Dale, Anders (2019). Bivariate causal mixture model quantifies polygenic overlap between complex traits beyond genetic correlation. Nature Communications.  ISSN 2041-1723.  10(1) . doi: 10.1038/s41467-019-10310-0
• Kaufmann, Tobias; van der Meer, Dennis; Doan, Nhat Trung; Schwarz, Emanuel; Lund, Martina Jonette; Agartz, Ingrid; Alnæs, Dag; Barch, Deanna M.; Baur-Streubel, Ramona; Bertolino, Alessandro; Bettella, Francesco; Beyer, Mona K.; Bøen, Erlend; Borgwardt, Stefan; Brandt, Christine Lycke; Buitelaar, Jan; Celius, Elisabeth Gulowsen; Cervenka, Simon; Conzelmann, Annette; Còrdova Palomera, Aldo; Dale, Anders; de Quervain, Dominique J.F.; di Carlo, Pasquale; Djurovic, Srdjan; Dørum, Erlend Solberg; Eisenacher, Sarah; Elvsåshagen, Torbjørn; Espeseth, Thomas; Fatouros-Bergman, Helena; Flyckt, Lena; Franke, Barbara; Frei, Oleksandr; Haatveit, Beathe; Håberg, Asta; Harbo, Hanne Flinstad; Hartman, Catharina A; Heslenfeld, Dirk J; Hoekstra, Pieter J; Høgestøl, Einar August; Jernigan, Terry L.; Jonassen, Rune; Jönsson, Erik Gunnar; Kirsch, Peter; Kłoszewska, Iwona; Kolskår, Knut-Kristian; Landrø, Nils Inge; Le Hellard, Stephanie; Lesch, Klaus-Peter; Lovestone, Simon; Lundervold, Arvid; Lundervold, Astri; Maglanoc, Luigi Angelo; Malt, Ulrik Fredrik; Mecocci, Patrizia; Melle, Ingrid; Meyer-Lindenberg, Andreas; Moberget, Torgeir; Norbom, Linn Christin Bonaventure; Nordvik, Jan Egil; Nyberg, Lars; Oosterlaan, Jaap; Papalino, Marco; Papassotiropoulos, Andreas; Pauli, Paul; Pergola, Giulio; Persson, Karin Ester Torun; Richard, Geneviève; Rokicki, Jaroslav; Sanders, Anne-Marthe; Selbæk, Geir; Shadrin, Alexey A.; Smeland, Olav Bjerkehagen; Soininen, Hilkka; Sowa, Piotr; Steen, Vidar Martin; Tsolaki, Magda; Ulrichsen, Kristine Moe; Vellas, Bruno; Wang, Lei; Westman, Eric; Ziegler, Georg C.; Zink, Mathias; Andreassen, Ole Andreas & Westlye, Lars Tjelta (2019). Common brain disorders are associated with heritable patterns of apparent aging of the brain. Nature Neuroscience.  ISSN 1097-6256.  22(10), s 1617- 1623 . doi: 10.1038/s41593-019-0471-7
• 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 (2019). Identification of genetic overlap and novel risk loci for attention-deficit/hyperactivity disorder and bipolar disorder. Molecular Psychiatry.  ISSN 1359-4184. . doi: 10.1038/s41380-019-0613-z Vis sammendrag

  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, genetic correlation reported for these disorders is low and non-significant. Here we aimed to better characterize the genetic architecture of these disorders utilizing recent large genome-wide association studies (GWAS). We analyzed independent GWAS summary statistics for ADHD (19,099 cases and 34,194 controls) and BD (20,352 cases and 31,358 controls) applying the conditional/conjunctional false discovery rate (condFDR/conjFDR) statistical framework that increases the power to detect novel phenotype-specific and shared loci by leveraging the combined power of two GWAS. We observed cross-trait polygenic enrichment for ADHD conditioned on associations with BD, and vice versa. Leveraging this enrichment, we identified 19 novel ADHD risk loci and 40 novel BD risk loci at condFDR <0.05. Further, we identified five loci jointly associated with ADHD and BD (conjFDR < 0.05). Interestingly, these five loci show concordant directions of effect for ADHD and BD. These results highlight a shared underlying genetic risk for ADHD and BD which may help to explain the high comorbidity rates and difficulties in differentiating between ADHD and BD in the clinic. Improving our understanding of the underlying genetic architecture of these disorders may aid in the development of novel stratification tools to help reduce these diagnostic difficulties.

• 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 (2019). Genome-wide analysis reveals extensive genetic overlap between schizophrenia, bipolar disorder, and intelligence. Molecular Psychiatry.  ISSN 1359-4184.  s 1- 10 . doi: 10.1038/s41380-018-0332-x Fulltekst i vitenarkiv.
• Smeland, Olav Bjerkehagen; Frei, Oleksandr; Fan, Chun-Chieh; Shadrin, Alexey A.; Dale, Anders & Andreassen, Ole Andreas (2019). The emerging pattern of shared polygenic architecture of psychiatric disorders, conceptual and methodological challenges. Psychiatric Genetics.  ISSN 0955-8829.  29(5), s 152- 159 . doi: 10.1097/YPG.0000000000000234 Vis sammendrag

  Genome-wide association studies have transformed psychiatric genetics and provided novel insights into the genetic etiology of psychiatric disorders. Two major discoveries have emerged; the disorders are polygenic, with a large number of common variants each with a small effect and many genetic variants influence more than one phenotype, suggesting shared genetic etiology. These concepts have the potential to revolutionize the current classification system with diagnostic categories and facilitate development of better treatments. However, to reach clinical impact, we need larger samples and better analytical tools, as most polygenic factors remain undetected. We here present statistical approaches designed to improve the yield of existing genome-wide association studies for polygenic phenotypes. We review how these tools have informed the current knowledge on the genetic architecture of psychiatric disorders, focusing on schizophrenia, bipolar disorder and major depression, and overlap with psychological and cognitive traits. We discuss application of statistical tools for stratification and prediction.

• Smeland, Olav Bjerkehagen; Frei, Oleksandr; Shadrin, Alexey A.; O`Connell, Kevin; Fan, Chun Chieh; Bahrami, Shahram; Holland, Dominic; Djurovic, Srdjan; Thompson, Wesley Kurt; Dale, Anders & Andreassen, Ole Andreas (2019). Discovery of shared genomic loci using the conditional false discovery rate approach. Human Genetics.  ISSN 0340-6717.  s 1- 10 . doi: 10.1007/s00439-019-02060-2 Fulltekst i vitenarkiv.
• Fan, Chun Chieh; Smeland, Olav Bjerkehagen; Schork, Andrew J.; Chen, Chi-Hua; Holland, Dominic; Lo, Min-Tzu; Sundar, Vijay S.; Frei, Oleksandr; Jernigan, Terry L.; Andreassen, Ole Andreas & Dale, Anders (2018). Beyond heritability: Improving discoverability in imaging genetics. Human Molecular Genetics.  ISSN 0964-6906.  27(1), s R22- R28 . doi: 10.1093/hmg/ddy082
• Srinivasan, Saurabh; Bettella, Francesco; Frei, Oleksandr; Hill, W. David; Wang, Yunpeng; Witoelar, Aree; Schork, Andrew J.; Thompson, Wesley Kurt; Davies, Gail; Desikan, Rahul S.; Deary, Ian J.; Melle, Ingrid; Ueland, Torill; Dale, Anders; Djurovic, Srdjan; Smeland, Olav Bjerkehagen & Andreassen, Ole Andreas (2018). Enrichment of genetic markers of recent human evolution in educational and cognitive traits. Scientific Reports.  ISSN 2045-2322.  8:12585, s 1- 9 . doi: 10.1038/s41598-018-30387-9 Fulltekst i vitenarkiv.
• van der Meer, Dennis; Rokicki, Jaroslav; Kaufmann, Tobias; Còrdova Palomera, Aldo; Moberget, Torgeir; Alnæs, Dag; Bettella, Francesco; Frei, Oleksandr; Doan, Nhat Trung; Sønderby, Ida Elken; Smeland, Olav Bjerkehagen; Agartz, Ingrid; Bertolino, Alessandro; Bralten, Janita; Brandt, Christine Lycke; Buitelaar, Jan K.; Djurovic, Srdjan; van Donkelaar, Marjolein; Dørum, Erlend Solberg; Espeseth, Thomas; Faraone, Stephen V.; Fernandéz, Guillén; Fisher, Simon E.; Franke, Barbara; Haatveit, Beathe Christin; Hartman, Catharina A.; Hoekstra, Pieter J.; Håberg, Asta; Jönsson, Erik Gunnar; Kolskår, Knut-Kristian; Le Hellard, Stephanie; Lund, Martina Jonette; Lundervold, Astri; Lundervold, Arvid; Melle, Ingrid; Monereo Sanchez, Jennifer; Norbom, Linn Christin Bonaventure; Nordvik, Jan Egil; Nyberg, Lars; Oosterlaan, Jaap; Papalino, Marco; Papassotiropoulos, Andreas; Pergola, Giulio; de Quervain, Dominique J.F.; Richard, Geneviéve´; Sanders, Anne-Marthe; Selvaggi, Pierluigi; Shumskaya, Elena; Steen, Vidar Martin; Tønnesen, Siren; Ulrichsen, Kristine Moe; Zwiers, Marcel P.; Andreassen, Ole Andreas & Westlye, Lars Tjelta (2018). Brain scans from 21,297 individuals reveal the genetic architecture of hippocampal subfield volumes. Molecular Psychiatry.  ISSN 1359-4184.  s 1- 13 . doi: 10.1038/s41380-018-0262-7 Fulltekst i vitenarkiv.
• Zuber, Verena; Jönsson, Erik Gunnar; Frei, Oleksandr; Witoelar, Aree; Thompson, Wesley Kurt; Schork, Andrew J.; Bettella, Francesco; Wang, Yunpeng; Djurovic, Srdjan; Smeland, Olav Bjerkehagen; Dieset, Ingrid; Fanous, Ayman H.; Desikan, Rahul S; Küry, Sébastien; Bézieau, Stéphane; Dale, Anders; Mills, Ian Geoffrey & Andreassen, Ole Andreas (2018). Identification of shared genetic variants between schizophrenia and lung cancer. Scientific Reports.  ISSN 2045-2322.  674(8), s 1- 8 . doi: 10.1038/s41598-017-16481-4 Fulltekst i vitenarkiv.
• 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 (2017). Novel loci associated with attention-deficit/hyperactivity disorder are revealed by leveraging polygenic overlap with educational attainment. Journal of the American Academy of Child and Adolescent Psychiatry.  ISSN 0890-8567.  57(2), s 86- 95 . doi: 10.1016/j.jaac.2017.11.013 Fulltekst i vitenarkiv.
• Smeland, Olav Bjerkehagen; Frei, Oleksandr; Kauppi, Karolina; Hill, W. David; Li, Wen; Wang, Yunpeng; Krull, Florian; Bettella, Francesco; Eriksen, Jon Alm; Witoelar, Aree; Davies, Gail; Fan, Chun Chieh; Thompson, Wesley Kurt; Lam, Max; Lencz, Todd; Chen, Chi-Hua; Ueland, Torill; Jönsson, Erik Gunnar; Djurovic, Srdjan; Deary, Ian J.; Dale, Anders & Andreassen, Ole Andreas (2017). Identification of genetic loci jointly influencing schizophrenia risk and the cognitive traits of verbal-numerical reasoning, reaction time, and general cognitive function. JAMA psychiatry.  ISSN 2168-6238.  74(10), s 1065- 1075 . doi: 10.1001/jamapsychiatry.2017.1986 Fulltekst i vitenarkiv.
• Smeland, Olav Bjerkehagen; Wang, Yunpeng; Frei, Oleksandr; Li, Wen; Hibar, Derrek P; Franke, Barbara; Bettella, Francesco; Witoelar, Aree; Djurovic, Srdjan; Chen, Chi-Hua; Thompson, P.M.; Dale, Anders & Andreassen, Ole Andreas (2017). Genetic overlap between schizophrenia and volumes of hippocampus, putamen, and intracranial volume indicates shared molecular genetic mechanisms. Schizophrenia Bulletin.  ISSN 0586-7614.  44(4), s 854- 864 . doi: 10.1093/schbul/sbx148
• 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 (2017). Identification of genetic loci shared between schizophrenia and the Big Five personality traits. Scientific Reports.  ISSN 2045-2322.  7:2222(1), s 1- 9 . doi: 10.1038/s41598-017-02346-3 Fulltekst i vitenarkiv.
• Winsvold, Bendik K S; Bettella, Francesco; Witoelar, Aree; Anttila, Verneri; Gormley, Padhraig; Kurth, Tobias; Terwindt, Gisela M; Freilinger, Tobias; Frei, Oleksandr; Shadrin, Alexey A.; Wang, Yunpeng; Dale, Anders; Van Den Maagdenberg, Arn M.J.M.; Chasman, Daniel I; Nyholt, Dale R; Palotie, Aarno; Andreassen, Ole Andreas & Zwart, John-Anker (2017). Shared genetic risk between migraine and coronary artery disease: A genome-wide analysis of common variants. PLOS ONE.  ISSN 1932-6203.  s 1- 15 . doi: 10.1371/journal.pone.0185663 Fulltekst i vitenarkiv.

Se alle arbeider i Cristin

• Smeland, Olav Bjerkehagen; Bahrami, Shahram; Frei, Oleksandr; Shadrin, Alexey A.; Savage, Jeanne E.; Watanabe, Kyoko; Krull, Florian; Bettella, Francesco; Steen, Nils Eiel; Ueland, Torill; Posthuma, Danielle; Djurovic, Srdjan; Dale, Anders & Andreassen, Ole Andreas (2018). Genome-wide analysis reveals extensive genetic overlap between schizophrenia, bipolar disorder and intelligence.
• Smeland, Olav Bjerkehagen; Frei, Oleksandr; Wang, Yunpeng; Dale, Anders & Andreassen, Ole Andreas (2017). Combined Analysis of Large Genetic Samples. New Statistical Approaches Improve Gene Discovery.
• Smeland, Olav Bjerkehagen; Frei, Oleksandr; Wang, Yunpeng; Fan, Chun Chieh; Alexey, Shadrin; Li, Wen; Florian, Krull; Bettella, Francesco; Witoelar, Aree; Thompson, Wesley Kurt; Djurovic, Srdjan; Dale, Anders & Andreassen, Ole Andreas (2017). Increased discovery of risk loci for bipolar disorder by leveraging prior probabilities of true associations using the covariate modulated mixture model (CM3).
• Smeland, Olav Bjerkehagen; Frei, Oleksandr; Wang, Yunpeng; Fan, Chun Chieh; Shadrin, Alexey A.; Li, Wen; Krull, Florian; Bettella, Francesco; Witoelar, Aree; Thompson, Wesley Kurt; Djurovic, Srdjan; Dale, Anders & Andreassen, Ole Andreas (2017). C-Reactive Protein Levels and Schizophrenia Share Genetic Influences.
• Smeland, Olav Bjerkehagen; Wang, Yunpeng; Frei, Oleksandr; Li, Wen; Hibar, Derrek; Franke, Barbara; Bettella, Francesco; Witoelar, Aree; Djurovic, Srdjan; Chen, Chi-Hua; Thompson, P.M.; Dale, Anders & Andreassen, Ole Andreas (2017). Conditional false discovery rate analysis of genome-wide association studies uncovers genetic loci shared between schizophrenia and volumes of hippocampus, putamen and intracranial volume.
• Smeland, Olav Bjerkehagen; Kauppi, Karolina; Wang, Yunpeng; Frei, Oleksandr; Li, Wen; Hill, David W; Davies, Gail; Eriksen, Jon Alm; Witoelar, Aree; Bettella, Francesco; Fan, Chun Chieh; Thompson, Wesley Kurt; Chen, Chi-Hua; Djurovic, Srdjan; Deary, Ian J.; Dale, Anders & Andreassen, Ole Andreas (2016). Schizophrenia and general cognitive function share genetic influences.

Se alle arbeider i Cristin