title: Advanced intercross line mapping of Eae5 reveals Ncf-1 and CLDN4 as candidate genes for experimental autoimmune encephalomyelitis.
abstract: Eae5 in rats was originally identified in two F(2) intercrosses, (DA x BN) and (E3 x DA), displaying linkage to CNS inflammation and disease severity in experimental autoimmune encephalomyelitis (EAE), respectively. This region overlaps with an arthritis locus, Pia4, which was also identified in the (E3 x DA) cross. Two congenic strains, BN.DA-Eae5 and BN.DA-Eae5.R1, encompassing the previously described Eae5 and Pia4, were established. DA alleles within the chromosome 12 fragment conferred an increase in disease susceptibility as well as increased inflammation and demyelination in the CNS as compared with BN alleles. To enable a more precise fine mapping of EAE regulatory genes, we used a rat advanced intercross line between the EAE-susceptible DA strain and the EAE-resistant PVG.1AV1 strain. Linkage analysis performed in the advanced intercross line considerably narrowed down the myelin oligodendrocyte glycoprotein-EAE regulatory locus (Eae5) to a approximately 1.3-megabase region with a defined number of candidate genes. In this study we demonstrate a regulatory effect of Eae5 on MOG-EAE by using both congenic strains as well as fine mapping these effects to a region containing Ncf-1, a gene associated with arthritis. In addition to structural polymorphisms in Ncf-1, both sequence polymorphisms and expression differences were identified in CLDN4. CLDN4 is a tight junction protein involved in blood-brain barrier integrity. In conclusion, our data strongly suggests Ncf-1 to be a gene shared between two organ-specific inflammatory diseases with a possible contribution by CLDN4 in encephalomyelitis.
authors: Department of Clinical Neuroscience, Neuroimmunology Unit, Karolinska Institutet, SE-171 76 Stockholm, Sweden. Kristina.Becanovic@cmm.ki.se
authors: Kristina
authors: K
authors: Becanovic
authors: Maja
authors: M
authors: Jagodic
authors: Jian Rong
authors: JR
authors: Sheng
authors: Ingrid
authors: I
authors: Dahlman
authors: Fahmy
authors: F
authors: Aboul-Enein
authors: Erik
authors: E
authors: Wallstrom
authors: Peter
authors: P
authors: Olofsson
authors: Rikard
authors: R
authors: Holmdahl
authors: Hans
authors: H
authors: Lassmann
authors: Tomas
authors: T
authors: Olsson