The Past, Present, and Future of Genetic Associations in Type 1 Diabetes

The Barbara Davis Center for Childhood Diabetes, University of Colorado Denver, Aurora, CO 80045-6511, USA.
Current Diabetes Reports (Impact Factor: 3.08). 07/2011; 11(5):445-53. DOI: 10.1007/s11892-011-0212-0
Source: PubMed


Type 1 diabetes mellitus (T1DM) is an autoimmune disease affecting approximately one in 300 individuals in the United States. The majority of genetic research to date has focused on the heritability that predisposes to islet autoimmunity and T1DM. The evidence so far points to T1DM being a polygenic, common, complex disease with major susceptibility lying in the major histocompatibility complex (MHC) on chromosome 6 with other smaller effects seen in loci outside of the MHC. With recent advances in technology, novel means of exploring the human genome have given way to new information in the development of T1DM. The newest technologies, namely high-throughput polymorphism typing and sequencing, have led to a paradigm shift in studying common diseases such as T1DM. In this review we highlight the advances in genetic associations in T1DM in the last several decades and how they have led to a better understanding of T1DM pathogenesis.

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    • "* 0201, B * 3906, or C * 0501) and class II (DPA1 * 0103-DPB1 * 0202 or DRB1 * 0405-DQA1 * 0301-DQB1 * 0302) alleles in T1D [41] "
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    ABSTRACT: Classical major histocompatibility complex (MHC) class I and II molecules present peptides to cognate T-cell receptors on the surface of T lymphocytes. The specificity with which T cells recognize peptide-MHC (pMHC) complexes has allowed for the utilization of recombinant, multimeric pMHC ligands for the study of minute antigen-specific T-cell populations. In type 1 diabetes (T1D), CD8+ cytotoxic T lymphocytes, in conjunction with CD4+ T helper cells, destroy the insulin-producing β cells within the pancreatic islets of Langerhans. Due to the importance of T cells in the progression of T1D, the ability to monitor and therapeutically target diabetogenic clonotypes of T cells provides a critical tool that could result in the amelioration of the disease. By administering pMHC multimers coupled to fluorophores, nanoparticles, or toxic moieties, researchers have demonstrated the ability to enumerate, track, and delete diabetogenic T-cell clonotypes that are, at least in part, responsible for insulitis; some studies even delay or prevent diabetes onset in the murine model of T1D. This paper will provide a brief overview of pMHC multimer usage in defining the role T-cell subsets play in T1D etiology and the therapeutic potential of pMHC for antigen-specific identification and modulation of diabetogenic T cells.
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    • "A region on chromosome 2 is almost significant (genome-wide adjusted P-value 0.20). A recent review (Baker and Steck 2011) lists two known associations with type 1 diabetes on chromosome 2. These are IFIH1 at 2q24.2 and CTLA4 (cytotoxic T lymphocyte associated antigen 4) at 2q33.2. "
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