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Browsing by Author "Sigurdsson, Engilbert"

Browsing by Author "Sigurdsson, Engilbert"

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  • Sigurdsson, Engilbert (Springer Science and Business Media LLC, 2018-07-05)
    Previous studies have shown an increased risk for mental health problems in children born to both younger and older parents compared to children of average-aged parents. We previously used a novel design to reveal a latent mechanism of genetic association ...
  • Guðmundsson, Ólafur Ó.; Walters, G. Bragi; Ingason, Andrés; Johansson, Stefan; Zayats, Tetyana; Athanasiu, Lavinia; Sonderby, Ida Elken; Gústafsson, Ómar; Nawaz, Muhammad S.; Jónsson, Guðbjörn F.; Jonsson, Lina; Knappskog, Per-Morten; Ingvarsdóttir, Ester; Daviðsdóttir, Katrín; Djurovic, Srdjan; Knudsen, Gun Peggy Strømstad; Askeland, Ragna Bugge; Haraldsdóttir, Gyða S.; Baldursson, Gísli; Magnússon, Páll; Sigurdsson, Engilbert; Gudbjartsson, Daniel; Stefansson, Hreinn; Andreassen, Ole A.; Haavik, Jan; Reichborn-Kjennerud, Ted; Stefansson, Kari (Springer Science and Business Media LLC, 2019-10-17)
    Attention-deficit/hyperactivity disorder (ADHD) is a highly heritable common childhood-onset neurodevelopmental disorder. Some rare copy number variations (CNVs) affect multiple neurodevelopmental disorders such as intellectual disability, autism ...
  • Andlauer, Till F. M.; Sigurdsson, Engilbert; Stefansson, Kari (Springer Science and Business Media LLC, 2019-11-11)
    Multiplex families with a high prevalence of a psychiatric disorder are often examined to identify rare genetic variants with large effect sizes. In the present study, we analysed whether the risk for bipolar disorder (BD) in BD multiplex families is ...
  • Czamara, Darina; Sigurdsson, Engilbert; Stefansson, Kari (Springer Science and Business Media LLC, 2019-06-11)
    Epigenetic processes, including DNA methylation (DNAm), are among the mechanisms allowing integration of genetic and environmental factors to shape cellular function. While many studies have investigated either environmental or genetic contributions ...
  • Ingimarsson, Oddur; MacCabe, James; Haraldsson, Magnús; Jónsdóttir, Halldóra; Sigurdsson, Engilbert (Springer Nature, 2016-12)
    Background Data on the haematological outcomes of patients who continue clozapine treatment following neutropenia are very rare as even mild neutropenia results in mandatory discontinuation of clozapine in most countries. However, in Iceland where ...
  • Hess, Jonathan L.; Sigurdsson, Engilbert; Stefansson, Hreinn; Stefansson, Kari (Springer Science and Business Media LLC, 2019-09-06)
    Based on the discovery by the Resilience Project (Chen R. et al. Nat Biotechnol 34:531–538, 2016) of rare variants that confer resistance to Mendelian disease, and protective alleles for some complex diseases, we posited the existence of genetic variants ...
  • Reginsson, Gunnar W.; Ingason, Andrés; Euesden, Jack; Bjornsdottir, Gyda; Ólafsson, Sigurgeir; Sigurdsson, Engilbert; Óskarsson, Högni; Tyrfingsson, Þórarinn; Rúnarsdóttir, Valgerður; Hansdóttir, Ingunn; Steinberg, Stacy; Stefánsson, Hreinn; Gudbjartsson, Daniel; Thorgeirsson, Thorgeir; Stefansson, Kari (Wiley, 2017-02-23)
    We use polygenic risk scores (PRSs) for schizophrenia (SCZ) and bipolar disorder (BPD) to predict smoking, and addiction to nicotine, alcohol or drugs in individuals not diagnosed with psychotic disorders. Using PRSs for 144 609 subjects, including 10 ...
  • Mullins, Niamh; Ingason, Andrés; Porter, Heather; Euesden, Jack; Gillett, Alexandra; Ólafsson, Sigurgeir; Gudbjartsson, Daniel; Lewis, Cathryn M.; Sigurdsson, Engilbert; Sæmundsen, Evald E.; Guðmundsson, Ólafur Ó.; Frigge, Michael L.; Kong, Augustine; Helgason, Agnar; Walters, G. Bragi; Gústafsson, Ómar; Stefánsson, Hreinn; Stefansson, Kari (Springer Nature, 2017-06-13)
    The persistence of common, heritable psychiatric disorders that reduce reproductive fitness is an evolutionary paradox. Here, we investigate the selection pressures on sequence variants that predispose to schizophrenia, autism, bipolar disorder, major ...