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  • 1.
    Henmyr, Viktor
    et al.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Biomedicin.
    Lind-Halldén, Christina
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Biomedicin.
    Halldén, Christer
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Biomedicin.
    Säll, Torbjörn
    Lund University.
    Carlberg, Daniel
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Biomedicin.
    Bachert, Claus
    Belgien.
    Cardell, Lars-Olaf
    Karolinska institutet.
    Chronic rhinosinusitis patients show accumulation of genetic variants in PARS22016Inngår i: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 11, nr 6, e0158202Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Genetic studies of chronic rhinosinusitis (CRS) have identified a total of 53 CRS-associated SNPs that were subsequently evaluated for their reproducibility in a recent study. The rs2873551 SNP in linkage disequilibrium with PARS2 showed the strongest association signal. The present study aims to comprehensively screen for rare variants in PARS2 and evaluate for accumulation of such variants in CRS-patients. Sanger sequencing and long-range PCR were used to screen for rare variants in the putative promoter region and coding sequence of 310 CRS-patients and a total of 21 variants were detected. The mutation spectrum was then compared with data from European populations of the 1000Genomes project (EUR) and the Exome Aggregation Consortium (ExAC). The CRS population showed a significant surplus of low-frequency variants compared with ExAC data. Haplotype analysis of the region showed a significant excess of rare haplotypes in the CRS population compared to the EUR population. Two missense mutations were also genotyped in the 310 CRS patients and 372 CRS-negative controls, but no associations with the disease were found. This is the first re-sequencing study in CRS research and also the first study to show an association of rare variants with the disease.

  • 2.
    Nilsson, Daniel
    et al.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Biomedicin.
    Andiappan, Anand Kumar
    Department of Biological Sciences, National University of Singapore.
    Halldén, Christer
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Biomedicin.
    Tim, Chew Fook
    Department of Biological Sciences, National University of Singapore.
    Säll, Torbjörn
    Department of Cell and Organism Biology, Lund University.
    Wang, De Yun
    Department of Otolaryngology, National University of Singapore.
    Cardell, Lars-Olaf
    Division of ENT Diseases, Department of Clinical Science, Intervention and Technology, Karolinska Institutet.
    Poor reproducibility of allergic rhinitis SNP associations2013Inngår i: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 8, nr 1, e53975- s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Replication of reported associations is crucial to the investigation of complex disease. More than 100 SNPs have previously been reported as associated with allergic rhinitis (AR), but few of these have been replicated successfully. To investigate the general reproducibility of reported AR-associations in candidate gene studies, one Swedish (352 AR-cases, 709 controls) and one Singapore Chinese population (948 AR-cases, 580 controls) were analyzed using 49 AR-associated SNPs. The overall pattern of P-values indicated that very few of the investigated SNPs were associated with AR. Given published odds ratios (ORs) most SNPs showed high power to detect an association, but no correlations were found between the ORs of the two study populations or with published ORs. None of the association signals were in common to the two genome-wide association studies published in AR, indicating that the associations represent false positives or have much lower effect-sizes than reported.

  • 3.
    Nilsson, Daniel
    et al.
    Division of ENT Diseases, Department of Clinical Sciences, Intervention and Technology, Karolinska Institutet.
    Andiappan, Anand Kumar
    Department of Biological Sciences, National University of Singapore.
    Halldén, Christer
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Biomedicin.
    Yun, Wang De
    Department of Otolaryngology, National University of Singapore.
    Säll, Torbjorn
    Department of Cell and Organism Biology, Lund University.
    Tim, Chew Fook
    Department of Biological Sciences, National University of Singapore.
    Cardell, Lars-Olaf
    Division of ENT Diseases, Department of Clinical Sciences, Intervention and Technology, Karolinska Institutet.
    Toll-like receptor gene polymorphisms are associated with allergic rhinitis: a case control study2012Inngår i: BMC Medical Genetics, ISSN 1471-2350, E-ISSN 1471-2350, Vol. 13, nr 1, 66- s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    BACKGROUND:The Toll-like receptor proteins are important in host defense and initiation of the innate and adaptive immune responses. A number of studies have identified associations between genetic variation in the Toll-like receptor genes and allergic disorders such as asthma and allergic rhinitis. The present study aim to search for genetic variation associated with allergic rhinitis in the Toll-like receptor genes.

    METHODS:A first association analysis genotyped 73 SNPs in 182 cases and 378 controls from a Swedish population. Based on these results an additional 24 SNPs were analyzed in one Swedish population with 352 cases and 709 controls and one Chinese population with 948 cases and 580 controls.

    RESULTS:The first association analysis identified 4 allergic rhinitis-associated SNPs in the TLR7-TLR8 gene region. Subsequent analysis of 24 SNPs from this region identified 7 and 5 significant SNPs from the Swedish and Chinese populations, respectively. The corresponding riskassociated haplotypes are significant after Bonferroni correction and are the most common haplotypes in both populations. The associations are primarily detected in females in the Swedish population, whereas it is seen in males in the Chinese population. Further independent support for the involvement of this region in allergic rhinitis was obtained from quantitative skin prick test data generated in both populations.

    CONCLUSIONS:Haplotypes in the TLR7-TLR8 gene region were associated with allergic rhinitis in one Swedish and one Chinese population. Since this region has earlier been associated with asthma and allergic rhinitis in a Danish linkage study this speaks strongly in favour of this region being truly involved in the development of this disease.

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