UMMS Affiliation
Department of Medicine, Division of Endocrinology and Metabolism
Publication Date
2021-06-01
Document Type
Article
Disciplines
Endocrine System Diseases | Endocrinology, Diabetes, and Metabolism | Genetics and Genomics | Immune System Diseases | Immunity | Immunopathology | Nutritional and Metabolic Diseases
Abstract
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.
Keywords
MHC, TCR, autoimmunity, genetics, immunogenetics, rat, type 1 diabetes
Rights and Permissions
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/).
DOI of Published Version
10.3390/genes12060852
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
Journal/Book/Conference Title
Genes
Related Resources
PubMed ID
34205929
Repository Citation
Mordes JP, Cort L, Liu Z, Eberwine R, Blankenhorn EP, Pierce BG. (2021). T Cell Receptor Genotype and Ubash3a Determine Susceptibility to Rat Autoimmune Diabetes. Open Access Publications by UMass Chan Authors. https://doi.org/10.3390/genes12060852. Retrieved from https://escholarship.umassmed.edu/oapubs/4782
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Included in
Endocrine System Diseases Commons, Endocrinology, Diabetes, and Metabolism Commons, Genetics and Genomics Commons, Immune System Diseases Commons, Immunity Commons, Immunopathology Commons, Nutritional and Metabolic Diseases Commons