1. Protective C allele of the single-nucleotide polymorphism rs1335532 is associated with strong binding of Ascl2 transcription factor and elevated CD58 expression in B-cells.
- Author
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Mitkin NA, Muratova AM, Korneev KV, Pavshintsev VV, Rumyantsev KA, Vagida MS, Uvarova AN, Afanasyeva MA, Schwartz AM, and Kuprash DV
- Subjects
- Alleles, Basic Helix-Loop-Helix Transcription Factors genetics, Binding Sites, CD58 Antigens chemistry, Cell Line, Tumor, Computational Biology methods, Enhancer Elements, Genetic, Female, Gene Expression Regulation, Neoplastic, Genetic Association Studies, Humans, Male, Multiple Sclerosis metabolism, Promoter Regions, Genetic, Wnt Signaling Pathway, Basic Helix-Loop-Helix Transcription Factors metabolism, CD58 Antigens genetics, Multiple Sclerosis genetics, Polymorphism, Single Nucleotide, Up-Regulation
- Abstract
CD58 is expressed on the surface of antigen-presenting cells, including B-cells, and provides co-stimulation to regulatory T-cells (Treg) through CD2 receptor binding. Tregs appear to be essential suppressors of tissue-specific autoimmune responses. Thereby, CD58 plays protective role in multiple sclerosis (MS) and CD58 was identified among several loci associated with MS susceptibility. Minor (C) variant of the single-nucleotide polymorphism (SNP) rs1335532 is associated with lower MS risk according to genome-wide association studies (GWAS) and its presence correlates with higher CD58 mRNA levels in MS patients. We found that genomic region containing rs1335532 has enhancer properties and can significantly boost the CD58 promoter activity in lymphoblast cells. Using bioinformatics and pull-down assay we found that the protective (C) rs1335532 allele created functional binding site for ASCL2 transcription factor, a target of the Wnt signaling pathway. Both in B-lymphoblastoid cell lines and in primary B-cells, as well as in a monocytic cell line, activation of Wnt signaling resulted in an increased CD58 promoter activity in the presence of the protective but not the risk allele of rs1335532, whereas ASCL2 knockdown abrogated this effect. In summary, our results suggest that ASCL2 mediates the protective function of rs1335532 minor (C) allele in MS., (Copyright © 2018 Elsevier B.V. All rights reserved.)
- Published
- 2018
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