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Vasculitis-susceptible genes in mice with a deficit in Fas-mediated apoptosis
M Nose1, M Terada, M Nishihara
1Department of Pathology, Ehime University School of Medicine, Shigenobu, Japan.
Abstract:
Autoimmune diseases show complex pathological manifestations, which frequently involve systemic vasculitis. This complication is understood to be a manifestation of advanced disease, or to represent distinct entities, restricted by genetic and/or environmental factors. An MRL/Mp strain of mice bearing the Fas deletion mutant gene, lpr (MRL/lpr), spontaneously develop systemic vasculitis coincidentally with glomerulonephritis, arthritis and sialoadenitis, but a C3H/HeJ-lpr/lpr (C3H/lpr) strain does not. Thus, this is a suitable model for analyzing the genetic basis of vasculitis in autoimmune diseases. To genetically dissect these complex pathological manifestations, a linkage analysis of each lesion with polymorphic microsatellite markers was performed by using MRL/lpr x (MRL/lpr x C3H/lpr)F1 backcross mice. Vasculitis-susceptible gene loci were mapped on chromosomes 3 and 4, which were not associated with glomerulonephritis, arthritis and sialoadenitis. These results indicate that systemic vasculitis in MRL/lpr mice may be under the control of host genes which are different from those for other autoimmune diseases.
Insights
Systemic vasculitis in autoimmune diseases is genetically distinct. Researchers mapped vasculitis-susceptible gene loci on chromosomes 3 and 4 in MRL/lpr mice, separate from other autoimmune conditions.
Area of Science:
- Immunology
- Genetics
- Pathology
Background:
- Autoimmune diseases often involve systemic vasculitis, a complication influenced by genetic and environmental factors.
- The MRL/lpr mouse strain spontaneously develops systemic vasculitis, making it a valuable model for studying its genetic basis.
- The C3H/lpr mouse strain does not develop vasculitis, providing a crucial comparison for genetic analysis.
Purpose of the Study:
- To genetically dissect the complex pathological manifestations of autoimmune diseases, specifically focusing on systemic vasculitis.
- To identify host genes controlling systemic vasculitis in the MRL/lpr mouse model.
- To determine if the genetic basis for vasculitis differs from that of other autoimmune conditions like glomerulonephritis, arthritis, and sialoadenitis.
Main Methods:
- Utilized a linkage analysis approach to map gene loci associated with specific pathological lesions.
- Employed MRL/lpr x (MRL/lpr x C3H/lpr)F1 backcross mice for genetic mapping.
- Analyzed the association of polymorphic microsatellite markers with vasculitis development.
Main Results:
- Identified specific gene loci associated with vasculitis susceptibility on chromosomes 3 and 4.
- Demonstrated that these vasculitis-susceptible loci are not linked to glomerulonephritis, arthritis, or sialoadenitis.
- Indicated that the genetic control of systemic vasculitis is distinct from other autoimmune pathologies observed in the MRL/lpr model.
Conclusions:
- Systemic vasculitis in MRL/lpr mice is controlled by distinct host genes.
- The genetic underpinnings of vasculitis in autoimmune diseases are separable from those of other associated conditions.
- This study provides a foundation for further investigation into the specific genes responsible for vasculitis in autoimmune settings.