title: Identification of genetic determinants of the sexual dimorphism in CNS autoimmunity.
abstract: Multiple sclerosis (MS) is a debilitating chronic inflammatory disease of the nervous system that affects approximately 2.3 million individuals worldwide, with higher prevalence in females, and a strong genetic component. While over 200 MS susceptibility loci have been identified in GWAS, the underlying mechanisms whereby they contribute to disease susceptibility remains ill-defined. Forward genetics approaches using conventional laboratory mouse strains are useful in identifying and functionally dissecting genes controlling disease-relevant phenotypes, but are hindered by the limited genetic diversity represented in such strains. To address this, we have combined the powerful chromosome substitution (consomic) strain approach with the genetic diversity of a wild-derived inbred mouse strain. Using experimental allergic encephalomyelitis (EAE), a mouse model of MS, we evaluated genetic control of disease course among a panel of 26 consomic strains of mice inheriting chromosomes from the wild-derived PWD strain on the C57BL/6J background, which models the genetic diversity seen in human populations. Nineteen linkages on 18 chromosomes were found to harbor loci controlling EAE. Of these 19 linkages, six were male-specific, four were female-specific, and nine were non-sex-specific, consistent with a differential genetic control of disease course between males and females. An MS-GWAS candidate-driven bioinformatic analysis using orthologous genes linked to EAE course identified sex-specific and non-sex-specific gene networks underlying disease pathogenesis. An analysis of sex hormone regulation of genes within these networks identified several key molecules, prominently including the MAP kinase family, known hormone-dependent regulators of sex differences in EAE course. Importantly, our results provide the framework by which consomic mouse strains with overall genome-wide genetic diversity, approximating that seen in humans, can be used as a rapid and powerful tool for modeling the genetic architecture of MS. Moreover, our data represent the first step towards mechanistic dissection of genetic control of sexual dimorphism in CNS autoimmunity.
authors: Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, Pennsylvania, 19129, United States of America.
authors: Frank
authors: F
authors: Bearoff
authors: Department of Medicine, University of Vermont, Burlington, Vermont, 05405, United States of America.
authors: Laure K
authors: LK
authors: Case
authors: Department of Medicine, University of Vermont, Burlington, Vermont, 05405, United States of America.
authors: Dimitry N
authors: DN
authors: Krementsov
authors: Department of Medicine, University of Vermont, Burlington, Vermont, 05405, United States of America.
authors: Emma H
authors: EH
authors: Wall
authors: Department of Medicine, University of Vermont, Burlington, Vermont, 05405, United States of America.
authors: Naresha
authors: N
authors: Saligrama
authors: Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, Pennsylvania, 19129, United States of America.
authors: Elizabeth P
authors: EP
authors: Blankenhorn
authors: Department of Medicine, University of Vermont, Burlington, Vermont, 05405, United States of America; Department of Pathology, University of Vermont, Burlington, Vermont, 05405, United States of America.
authors: Cory
authors: C
authors: Teuscher
mesh_terms: D000818:Animals; D015551:Autoimmunity / Q000235:genetics* / Q000502:physiology*; D002490:Central Nervous System / Q000276:immunology*; D002874:Chromosome Mapping; D033481:Chromosomes, Mammalian / Q000235:genetics; D003198:Computer Simulation; D004681:Encephalomyelitis, Autoimmune, Experimental / Q000235:genetics / Q000378:metabolism / Q000473:pathology / Q000503:physiopathology; D005260:Female; D014644:Genetic Variation; D023281:Genomics; D012739:Gonadal Steroid Hormones / Q000378:metabolism; D008297:Male; D051379:Mice; D012727:Sex Characteristics; D015398:Signal Transduction
chemical_list: D012739:Gonadal Steroid Hormones