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Functional Role of Genetic Polymorphisms Associated with Systemic Lupus Erythematosus

Löfgren, Sara E, 1977- (författare)
Uppsala universitet,Medicinsk genetik,Prof. Ulf Gyllensten
Gyllensten, Ulf, Professor (preses)
Uppsala universitet,Institutionen för immunologi, genetik och patologi
Hillert, Jan, Professor (opponent)
Department of Clinical Neuroscience, Karolinska Institutet
 (creator_code:org_t)
ISBN 9789155482589
Uppsala : Acta Universitatis Upsaliensis, 2012
Engelska 69s.
Serie: Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Medicine, 1651-6206 ; 736
  • Doktorsavhandling (övrigt vetenskapligt)
Abstract Ämnesord
Stäng  
  • Systemic lupus erythematosus (SLE) is a chronic and complex autoimmune disorder characterized by a failure in the mechanism of self-tolerance and production of autoantibodies, potentially affecting any organ in the body. The genetic factors behind the disease have been extensively studied in the past years and to date a list of more than 30 loci have been associated with SLE. However, very little is known about the functional significance of the risk variants. In this thesis, we focused on the analysis of SLE-associated variants in three genes: interferon regulatory factor 5 (IRF5), CD226 and the microRNA 146a. In paper I, we analyzed four polymorphisms in the IRF5 gene in a large set of individuals from different populations. We replicated a strong association of a promoter indel in our meta-analysis, but expression analysis indicated that it is rather another variant, SNP rs10954213 in the poly(A) signal of the gene that is in fact the major contributor to the altered gene expression in leukocytes. In manuscript II, we further characterized the regulation of IRF5 expression, showing that this gene can be up-regulated by estrogen in PBMCs and monocytes, regardless of the genotype, which could to some extent, explain the sex-bias of SLE. In paper III, we investigated the association of CD226 with SLE and the potential functional effect of the associated variants. The genetic analysis showed an association of a three-SNP-haplotype located at the 3’UTR region of the gene. The risk haplotype correlated with lower CD226 protein expression on the surface of cytotoxic and helper T cells, as well as in NK T cells. Reporter assays pointed to rs727088 in the 3’UTR as the main responsible variant for altered gene expression. In paper IV, we described the association of a variant in microRNA miR-146a, involved in the interferon pathway, with SLE in Europeans, which could in addition be correlated with decreased expression of both mature and primary miR-146a in leukocytes. In summary, we have investigated the genetic association of three genes with SLE in a large cohort of individuals and identified variants responsible for functional alterations of these genes, providing further insight into the pathogenesis of SLE.

Ämnesord

MEDICAL AND HEALTH SCIENCES  -- Basic Medicine -- Medical Genetics (hsv//eng)
MEDICIN OCH HÄLSOVETENSKAP  -- Medicinska och farmaceutiska grundvetenskaper -- Medicinsk genetik (hsv//swe)
MEDICIN OCH HÄLSOVETENSKAP  -- Medicinska och farmaceutiska grundvetenskaper (hsv//swe)
MEDICAL AND HEALTH SCIENCES  -- Basic Medicine (hsv//eng)

Nyckelord

autoimmunity
systemic lupus erythematosus
genetic association
single nucleotide polymorphism
IRF5
CD226
miR-146a
Medical Science
Medicinsk vetenskap
Medical Genetics
Medicinsk genetik

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