Abstract
Systemic lupus erythematosus is a chronic multi-organ autoimmune disease marked mainly by the production of anti-nuclear antibodies. Nuclear antigens become accessible to the immune system following apoptosis and defective clearance of apoptotic debris has been shown in several knockout mouse models to promote lupus. However, genetic loci associated with defective clearance are not well defined in spontaneously arising lupus models. We previously showed that introgression of the chromosome 13 interval from lupus-prone New Zealand Black (NZB) mice onto a non-autoimmune B6 genetic background (B6.NZBc13) recapitulated many of the NZB autoimmune phenotypes. Here, we show that B6.NZBc13 mice have impaired clearance of apoptotic debris by peritoneal and tingible-body macrophages and have narrowed down the chromosomal interval of this defect using subcongenic mice with truncated NZB chromosome 13 intervals. This chromosomal region (81–94 Mb) is sufficient to produce polyclonal B- and T-cell activation, and expansion of dendritic cells. To fully recapitulate the autoimmune phenotypes seen in B6.NZBc13 mice, at least one additional locus located in the centromeric portion of the interval is required. Thus, we have identified a novel lupus susceptibility locus on NZB chromosome 13 that is associated with impaired clearance of apoptotic debris.
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Acknowledgements
This work was supported by research grants from The Arthritis Society and the Canadian Institutes of Health Research awarded to JW. JW receives salary support from The Arthritis Centre of Excellence. EP is the recipient of a studentship from the Ontario Graduate Scholarship in Science and Technology—Government of Ontario/Edward Dunlop Foundation Scholarships. CL is the recipient of a Canadian Institutes of Health Research Doctoral Research Award. GM is the recipient of a studentship from the Queen Elizabeth II/Aventis Pasteur Graduate Scholarships in Science and Technology.
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Pau, E., Loh, C., Minty, G. et al. Identification of a lupus-susceptibility locus leading to impaired clearance of apoptotic debris on New Zealand Black chromosome 13. Genes Immun 14, 154–161 (2013). https://doi.org/10.1038/gene.2012.64
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DOI: https://doi.org/10.1038/gene.2012.64