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Defective central tolerance induction in NOD mice: genomics and genetics
Silvia Zucchelli1, Phil Holler, Tetsuya Yamagata
1Section on Immunology and Immunogenetics, Joslin Diabetes Center, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02215, USA.
Immunity
|March 23, 2005
Summary
Genetic factors in NOD mice impair central T cell tolerance, hindering the deletion of self-reactive thymocytes crucial for preventing type-1 diabetes. This defect involves multiple genes and altered gene expression related to cell survival and apoptosis.
Area of Science:
- Immunology
- Genetics
- Endocrinology
Background:
- Type-1 diabetes (T1D) in Non-Obese Diabetic (NOD) mice is influenced by genetic factors affecting immune tolerance.
- Central T cell tolerance induction and peripheral immunoregulation are critical for preventing autoimmune diseases like T1D.
Purpose of the Study:
- To investigate the role of the NOD genetic background in central T cell tolerance.
- To identify genetic loci and gene expression changes contributing to T1D susceptibility in NOD mice.
Main Methods:
- Fetal thymic organ cultures (FTOC) were used to study thymocyte behavior in NOD and B6.H2g7 mice.
- Genetic analyses compared NOD and B6.H2g7 FTOCs to map relevant genetic loci.
- Microarray analyses assessed gene expression differences in FTOCs from both strains.
Main Results:
- The NOD genetic background shows a quantitative defect in deleting self-reactive thymocytes and diverting them to the CD8alphaalpha lineage.
- Genetic analyses identified multiple loci on chromosomes 1 and 3 influencing this defect.
- Microarray data revealed altered gene expression in NOD FTOCs, with decreased apoptosis and increased cell survival programs.
Conclusions:
- The NOD genetic background contributes to T1D susceptibility through impaired central T cell tolerance.
- Multiple genetic loci and dysregulated gene expression pathways underlie this tolerance defect.
- Candidate genes involved in apoptosis and cell survival warrant further investigation for their role in T1D pathogenesis.
