Haplotype-Specific Expression Analysis of MHC Class II Genes in Healthy Individuals and Rheumatoid Arthritis Patients

被引:12
|
作者
Houtman, Miranda [1 ]
Hesselberg, Espen [1 ]
Ronnblom, Lars [2 ]
Klareskog, Lars [1 ]
Malmstrom, Vivianne [1 ]
Padyukov, Leonid [1 ]
机构
[1] Karolinska Univ Hosp, Karolinska Inst, Div Rheumatol, Dept Med, Stockholm, Sweden
[2] Uppsala Univ, Dept Med Sci Rheumatol, Sci Life Lab, Uppsala, Sweden
来源
FRONTIERS IN IMMUNOLOGY | 2021年 / 12卷
基金
瑞典研究理事会;
关键词
major histocompatibility complex; RNA-sequencing; allelic expression; T cell; monocyte; rheumatoid arthritis; HLA-DR; ASSOCIATION; HYPOTHESIS; RISK; PCR;
D O I
10.3389/fimmu.2021.707217
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
HLA-DRB1 alleles have been associated with several autoimmune diseases. For anti-citrullinated protein antibody positive rheumatoid arthritis (RA), HLA-DRB1 shared epitope (SE) alleles are the major genetic risk factors. In order to study the genetic regulation of major histocompatibility complex (MHC) Class II gene expression in immune cells, we investigated transcriptomic profiles of a variety of immune cells from healthy individuals carrying different HLA-DRB1 alleles. Sequencing libraries from peripheral blood mononuclear cells, CD4+ T cells, CD8+ T cells, and CD14+ monocytes of 32 genetically pre-selected healthy female individuals were generated, sequenced and reads were aligned to the standard reference. For the MHC region, reads were mapped to available MHC reference haplotypes and AltHapAlignR was used to estimate gene expression. Using this method, HLA-DRB and HLA-DQ were found to be differentially expressed in different immune cells of healthy individuals as well as in whole blood samples of RA patients carrying HLA-DRB1 SE-positive versus SE-negative alleles. In contrast, no genes outside the MHC region were differentially expressed between individuals carrying HLA-DRB1 SE-positive and SE-negative alleles, thus HLA-DRB1 SE alleles have a strong cis effect on gene expression. Altogether, our findings suggest that immune effects associated with different allelic forms of HLA-DR and HLA-DQ may be associated not only with differences in the structure of these proteins, but also with differences in their expression levels.
引用
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页数:11
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