T Cell Receptor Genotype and Ubash3a Determine Susceptibility to Rat Autoimmune Diabetes
Authors
Mordes, John P.Cort, Laura
Liu, Zhijun
Eberwine, Ryan
Blankenhorn, Elizabeth P.
Pierce, Brian G.
UMass Chan Affiliations
Department of Medicine, Division of Endocrinology and MetabolismDocument Type
Journal ArticlePublication Date
2021-06-01Keywords
MHCTCR
autoimmunity
genetics
immunogenetics
rat
type 1 diabetes
Endocrine System Diseases
Endocrinology, Diabetes, and Metabolism
Genetics and Genomics
Immune System Diseases
Immunity
Immunopathology
Nutritional and Metabolic Diseases
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Genetic analyses of human type 1 diabetes (T1D) have yet to reveal a complete pathophysiologic mechanism. Inbred rats with a high-risk class II major histocompatibility complex (MHC) haplotype (RT1B/D(u)) can illuminate such mechanisms. Using T1D-susceptible LEW.1WR1 rats that express RT1B/D(u) and a susceptible allele of the Ubd promoter, we demonstrate that germline knockout of Tcrb-V13S1A1, which encodes the Vbeta13a T cell receptor beta chain, completely prevents diabetes. Using the RT1B/D(u)-identical LEW.1W rat, which does not develop T1D despite also having the same Tcrb-V13S1A1 beta chain gene but a different allele at the Ubd locus, we show that knockout of the Ubash3a regulatory gene renders these resistant rats relatively susceptible to diabetes. In silico structural modeling of the susceptible allele of the Vbeta13a TCR and its class II RT1(u) ligand suggests a mechanism by which a germline TCR beta chain gene could promote susceptibility to T1D in the absence of downstream immunoregulation like that provided by UBASH3A. Together these data demonstrate the critical contribution of the Vbeta13a TCR to the autoimmune synapse in T1D and the regulation of the response by UBASH3A. These experiments dissect the mechanisms by which MHC class II heterodimers, TCR and regulatory element interact to induce autoimmunity.Source
Mordes JP, Cort L, Liu Z, Eberwine R, Blankenhorn EP, Pierce BG. T Cell Receptor Genotype and Ubash3a Determine Susceptibility to Rat Autoimmune Diabetes. Genes (Basel). 2021 Jun 1;12(6):852. doi: 10.3390/genes12060852. PMID: 34205929; PMCID: PMC8227067. Link to article on publisher's site
DOI
10.3390/genes12060852Permanent Link to this Item
http://hdl.handle.net/20.500.14038/41979PubMed ID
34205929Related Resources
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Copyright © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).Distribution License
http://creativecommons.org/licenses/by/4.0/ae974a485f413a2113503eed53cd6c53
10.3390/genes12060852
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Except where otherwise noted, this item's license is described as Copyright © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).