Browsing Bergen Open Research Archive by Author "Gjessing, Håkon K."

Now showing items 21-32 of 32

    • A note on the Wick product 

      Gjessing, Håkon K. (Statistical report no. 23, Research report, 1993-03)

    • Parent-of-origin-environment interactions in case-parent triads with or without independent controls 

      Gjerdevik, Miriam; Haaland, Øystein Ariansen; Romanowska, Julia; Lie, Rolv T.; Jugessur, Astanand; Gjessing, Håkon K. (Peer reviewed; Journal article, 2018-03)
      With case–parent triad data, one can frequently deduce parent of origin of the child's alleles. This allows a parent‐of‐origin (PoO) effect to be estimated as the ratio of relative risks associated with the alleles inherited ...

    • Placental epigenetic clocks: estimating gestational age using placental DNA methylation levels 

      Lee, Yunsung; Choufani, Sanaa; Weksberg, Rosanna; Wilson, Samantha L.; Yuan, Victor; Burt, Amber; Marsit, Carmen; Lu, Ake T.; Ritz, Beate; Bohlin, Jon; Gjessing, Håkon K.; Harris, Jennifer Ruth; Magnus, Per; Binder, Alexandra M.; Robinson, Wendy P.; Jugessur, Astanand; Horvath, Steve (Peer reviewed; Journal article, 2019)
      The human pan-tissue epigenetic clock is widely used for estimating age across the entire lifespan, but it does not lend itself well to estimating gestational age (GA) based on placental DNAm methylation (DNAm) data. We ...

    • Pregnancy and risk of COVID-19: a Norwegian registry-linkage study 

      Magnus, Maria Christine; Oakley, Laura L.; Gjessing, Håkon K.; Stephansson, Olof; Engjom, Hilde Marie; Macsali, Ferenc; Juliusson, Pétur Benedikt; Nybo Andersen, Anne-Marie; Håberg, Siri Eldevik (Journal article; Peer reviewed, 2021)
      Objective: To compare the risk of acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection and contact with specialist healthcare services for coronavirus disease 2019 (COVID-19) between pregnant and non-pregnant ...

    • Psychosocial work factors and sick leave risk after a terrorist bomb attack: a survey and registry-based longitudinal study of governmental employees in Norway 

      Dale, Maria Teresa Grønning; Nissen, Alexander; Berthelsen, Mona; Gjessing, Håkon K.; Heir, Trond (Journal article; Peer reviewed, 2021)
      Objectives Studies show that social support may reduce the negative psychological effects of terror. The aim was to explore the effects of the psychosocial work environment on sick leave risk among governmental employees ...

    • Risk Factors for Extended Duration of Acute Diarrhea in Young Children 

      Strand, Tor A.; Sharma, Pushpa R.; Gjessing, Håkon K.; Ulak, Manjeswori; Chandyo, Ram Krishna; Adhikari, Ramesh K.; Sommerfelt, Halvor (Peer reviewed; Journal article, 2012-05-08)
      Objective and Background: We sought to identify predictors of extended duration of diarrhea in young children, which contributes substantially to the nearly 1 1/2 million annual diarrheal deaths globally. Methods: We ...

    • Seasonal and pandemic influenza during pregnancy and risk of fetal death: A Norwegian registry‑based cohort study 

      Gunnes, Nina; Gjessing, Håkon K.; Bakken, Inger Johanne Landsjøåsen; Ghaderi, Sara; Gran, Jon Michael; Hungnes, Olav; Magnus, Per; Samuelsen, Sven Ove; Skrondal, Anders; Stoltenberg, Camilla; Trogstad, Lill; Wilcox, Allen James; Håberg, Siri Eldevik (Journal article; Peer reviewed, 2020)
      Previous studies of fetal death with maternal influenza have been inconsistent. We explored the effect of maternal influenza-like illness (ILI) in pregnancy on the risk of fetal death, distinguishing between diagnoses ...

    • Seed viability and germination success of Acacia tortilis along landuse and aridity gradients in the Eastern Sahara 

      Andersen, Gidske Leknæs; Krzywinski, Knut; Gjessing, Håkon K.; Pierce, Richard (Peer reviewed; Journal article, 2016-01)
      Our study focuses on the keystone species Acacia tortilis and is the first to investigate the effect of domestic ungulates and aridity on seed viability and germination over an extensive part of the Eastern Sahara. Bruchids ...

    • Wavelet Screening identifies regions highly enriched for differentially methylated loci for orofacial clefts 

      Denault, William Robert Paul; Romanowska, Julia; Haaland, Øystein Ariansen; Lyle, Robert; Taylor, Jack A.; Xu, Zongli; Lie, Rolv T.; Gjessing, Håkon K.; Jugessur, Astanand (Journal article; Peer reviewed, 2021)
      DNA methylation is the most widely studied epigenetic mark in humans and plays an essential role in normal biological processes as well as in disease development. More focus has recently been placed on understanding ...

    • Wavelet Screening: a novel approach to analyzing GWAS data 

      Denault, William Robert Paul; Gjessing, Håkon K.; Juodakis, Julius; Jacobsson, Bo; Jugessur, Astanand (Journal article; Peer reviewed, 2021)
      Background Traditional methods for single-variant genome-wide association study (GWAS) incur a substantial multiple-testing burden because of the need to test for associations with a vast number of single-nucleotide ...

    • The X-factor in ART: does the use of assisted reproductive technologies influence DNA methylation on the X chromosome? 

      Romanowska, Julia; Nustad, Haakon Egdetveit; Page, Christian Magnus; Denault, William Robert Paul; Lee, Yunsung; Magnus, Maria Christine; Haftorn, Kristine Løkås; Gjerdevik, Miriam; Novakovic, Boris; Saffery, Richard; Gjessing, Håkon K.; lyle, robert; Magnus, Per Minor; Håberg, Siri Eldevik; Jugessur, Astanand (Journal article; Peer reviewed, 2023)
      Background Assisted reproductive technologies (ART) may perturb DNA methylation (DNAm) in early embryonic development. Although a handful of epigenome-wide association studies of ART have been published, none have investigated ...

    • X-Linked Genes and Risk of Orofacial Clefts: Evidence from Two Population-Based Studies in Scandinavia 

      Jugessur, Astanand; Skare, Øivind; Lie, Rolv Terje; Wilcox, Allen James; Christensen, Kaare; Christiansen, Lene; Nguyen, Truc Trung; Murray, Jeffrey Clark; Gjessing, Håkon K. (Peer reviewed; Journal article, 2012-06-19)
      Background: Orofacial clefts are common birth defects of complex etiology, with an excess of males among babies with cleft lip and palate, and an excess of females among those with cleft palate only. Although genes on the ...