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BB rat Gimap gene expression in sorted lymphoid T and B cells
Daniel H Moralejo1, Jessica M Fuller, Elizabeth A Rutledge
1Department of Comparative Medicine, University of Washington 1959 N.E. Pacific St., Box 357710, Seattle, WA 98195, USA.
Life Sciences
|September 20, 2011
Summary
Reduced expression of the Gimap gene family in rats with a Gimap5 mutation impacts T cell development and peripheral T cell homeostasis, potentially contributing to type 1 diabetes.
Area of Science:
- Immunology
- Genetics
Background:
- The Gimap gene family is crucial for T cell survival and development.
- A Gimap5 mutation causes lymphopenia and is linked to type 1 diabetes (T1D) in BioBreeding rats.
- Other Gimap family members within the Iddm39 quantitative trait locus (QTL) are implicated in T1D.
Purpose of the Study:
- To investigate the role of Gimap gene family expression in T1D.
- To determine if Gimap family members within the Iddm39 QTL influence thymocyte development and peripheral T and B cells in T1D.
Main Methods:
- Quantitative real-time PCR (qRT-PCR) was used to analyze Gimap gene expression.
- Cell-sorted subpopulations from thymocytes and peripheral T and B cells were examined.
Main Results:
- Gimap4 expression was reduced in various thymocyte subpopulations (double negative, double positive, CD8 single positive) of Gimap5-mutant rats.
- Gimap8, Gimap6, and Gimap7 expression were reduced in CD8 single positive thymocytes.
- The entire Gimap gene family showed reduced expression in peripheral T cells, but not B cells (except Gimap6).
- Gimap9 was detected in non-B hematopoietic cells (macrophages, dendritic cells, NK cells).
Conclusions:
- The absence of Gimap5 protein is associated with impaired expression of the entire Gimap gene family.
- This impairment may affect T cell homeostasis in peripheral lymphoid organs.
- These findings suggest a broader role for the Gimap gene family in T1D pathogenesis beyond Gimap5's direct effect on lymphopenia.
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