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Browsing Bergen Open Research Archive by Author "Jugessur, Astanand"

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    • Analysis of Parent-of-Origin Effects on the X Chromosome in Asian and European Orofacial Cleft Triads Identifies Associations with DMD, FGF13, EGFL6, and Additional Loci at Xp22.2 

      Skare, Øivind; Lie, Rolv T.; Haaland, Øystein Ariansen; Gjerdevik, Miriam; Romanowska, Julia; Gjessing, Håkon K.; Jugessur, Astanand (Peer reviewed; Journal article, 2018-02-22)
      Background: Although both the mother's and father's alleles are present in the offspring, they may not operate at the same level. These parent-of-origin (PoO) effects have not yet been explored on the X chromosome, which ...
    • Design efficiency in genetic association studies 

      Gjerdevik, Miriam; Gjessing, Håkon K.; Romanowska, Julia; Haaland, Øystein Ariansen; Jugessur, Astanand; Czajkowski, Nikolai Olavi; Lie, Rolv T. (Journal article; Peer reviewed, 2020)
      Selecting the best design for genetic association studies requires careful deliberation; different study designs can be used to scan for different genetic effects, and each design has its own set of strengths and limitations. ...
    • Epigenome-wide association study of leukocyte telomere length 

      Lee, Yunsung; Sun, Dianjianyi; Ori, Anil P.S.; Lu, Ake T.; Seeboth, Anne; Harris, Sarah E.; Deary, Ian J.; Marioni, Riccardo E.; Sørensen, Mette; Mengel-From, Jonas; Hjelmborg, Jacob; Christensen, Kaare; Wilson, James G.; Levy, Daniel; Reiner, Alex P.; Chen, Wei; Li, Shengxu; Harris, Jennifer Ruth; Magnus, Per; Aviv, Abraham; Jugessur, Astanand; Horvath, Steve (Peer reviewed; Journal article, 2019)
      Telomere length is associated with age-related diseases and is highly heritable. It is unclear, however, to what extent epigenetic modifications are associated with leukocyte telomere length (LTL). In this study, we conducted ...
    • Genome-wide analysis of parent-of-origin interaction effects with environmental exposure (PoOxE): An application to European and Asian cleft palate trios 

      Haaland, Øystein Ariansen; Jugessur, Astanand; Gjerdevik, Miriam; Romanowska, Julia; Shi, Min; Beaty, Terri H.; Marazita, Mary L.; Murray, Jeffrey C.; Wilcox, Allen J.; Lie, Rolv T.; Gjessing, Håkon K. (Peer reviewed; Journal article, 2017-09-12)
      Cleft palate only is a common birth defect with high heritability. Only a small fraction of this heritability is explained by the genetic variants identified so far, underscoring the need to investigate other disease ...
    • A genome-wide scan of cleft lip triads identifies parent-of-origin interaction effects between ANK3 and maternal smoking, and between ARHGEF10 and alcohol consumption 

      Haaland, Øystein Ariansen; Romanowska, Julia; Gjerdevik, Miriam; Lie, Rolv T.; Gjessing, Håkon K.; Jugessur, Astanand (Peer reviewed; Journal article, 2019-06-24)
      Background: Although both genetic and environmental factors have been reported to influence the risk of isolated cleft lip with or without cleft palate (CL/P), the exact mechanisms behind CL/P are still largely unaccounted ...
    • A genome-wide scan of cleft lip triads identifies parent-of-origin interaction effects between ANK3 and maternal smoking, and between ARHGEF10 and alcohol consumption 

      Haaland, Øystein Ariansen; Romanowska, Julia; Gjerdevik, Miriam; Lie, Rolv T.; Gjessing, Håkon K.; Jugessur, Astanand (Journal article, 2019-06-24)
      Background: Although both genetic and environmental factors have been reported to influence the risk of isolated cleft lip with or without cleft palate (CL/P), the exact mechanisms behind CL/P are still largely unaccounted ...
    • A genome-wide search for gene-environment effects in isolated cleft lip with or without cleft palate triads points to an interaction between maternal periconceptional vitamin use and variants in ESRRG 

      Haaland, Øystein Ariansen; Lie, Rolv T.; Romanowska, Julia; Gjerdevik, Miriam; Gjessing, Håkon K.; Jugessur, Astanand (Peer reviewed; Journal article, 2018-02-26)
      Background: It is widely accepted that cleft lip with or without cleft palate (CL/P) results from the complex interplay between multiple genetic and environmental factors. However, a robust investigation of these ...
    • Haplin power analysis: a software module for power and sample size calculations in genetic association analyses of family triads and unrelated controls 

      Gjerdevik, Miriam; Jugessur, Astanand; Haaland, Øystein Ariansen; Romanowska, Julia; Lie, Rolv T.; Cordell, Heather J.; Gjessing, Håkon K. (Peer reviewed; Journal article, 2019-04-02)
      Background: Log-linear and multinomial modeling offer a flexible framework for genetic association analyses of offspring (child), parent-of-origin and maternal effects, based on genotype data from a variety of child-parent ...
    • Maternal angiotensinogen (AGT) haplotypes, fetal renin (REN) haplotypes and risk of preeclampsia; estimation of gene-gene interaction from family-triad data 

      Vefring, Hege K.; Wee, Line; Jugessur, Astanand; Gjessing, Håkon K.; Nilsen, Stein Tore; Lie, Rolv Terje (Peer reviewed; Journal article, 2010-06-10)
      Background Preeclampsia is a debilitating disorder affecting approximately 3% of pregnant women in the Western world. Although inconclusive, current evidence suggests that the renin-angiotensin system may be involved in ...
    • Maternal genes and facial clefts in offspring: a comprehensive search for genetic associations in two population-based cleft studies from Scandinavia 

      Jugessur, Astanand; Shi, Min; Gjessing, Håkon K.; Lie, Rolv Terje; Wilcox, Allen James; Weinberg, Clarice Ring; Christensen, Kaare; Boyles, Abee Lowman; Daack-Hirsch, Sandra; Nguyen, Truc Trung; Christiansen, Lene; Lidral, Andrew Carl; Murray, Jeffrey Clark (Peer reviewed; Journal article, 2010-07-09)
      Background Fetal conditions can in principle be affected by the mother's genotype working through the prenatal environment. Methodology/Principal Findings Genotypes for 1536 SNPs in 357 cleft candidate genes were available ...
    • A new approach to chromosome-wide analysis of X-linked markers identifies new associations in Asian and European case-parent triads of orofacial clefts 

      Skare, Øivind; Gjessing, Håkon K.; Gjerdevik, Miriam; Haaland, Øystein Ariansen; Romanowska, Julia; Lie, Rolv T.; Jugessur, Astanand (Peer reviewed; Journal article, 2017-09-06)
      Background: GWAS discoveries on the X-chromosome are underrepresented in the literature primarily because the analytical tools that have been applied were originally designed for autosomal markers. Our objective here is ...
    • 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 ...
    • Rapid genotyping of the human renin (REN) gene by the LightCycler® instrument: Identification of unexpected nucleotide substitutions within the selected hybridization probe area 

      Wee, Line L.; Vefring, Hege; Jonsson, Grete; Jugessur, Astanand; Lie, Rolv Terje (Peer reviewed; Journal article, 2010)
      Preeclampsia is a serious disorder affecting nearly 3% of all in the Western world. It is associated with hypertension and proteinuria, and several lines of evidence suggest that the renin-angiotensin system (RAS) may be ...
    • 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 ...

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