RGD Reference Report - Detection of arthritis-susceptibility loci, including Ncf1, and variable effects of the major histocompatibility complex region depending on genetic background in rats. - Rat Genome Database

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Detection of arthritis-susceptibility loci, including Ncf1, and variable effects of the major histocompatibility complex region depending on genetic background in rats.

Authors: Rintisch, C  Forster, M  Holmdahl, R 
Citation: Rintisch C, etal., Arthritis Rheum. 2009 Feb;60(2):419-27.
RGD ID: 2306838
Pubmed: PMID:19180494   (View Abstract at PubMed)
DOI: DOI:10.1002/art.24292   (Journal Full-text)

OBJECTIVE: To characterize the arthritis-modulating effects of 3 non-major histocompatibility complex (MHC) quantitative trait loci (QTLs) in rat experimental arthritis in the disease-resistant E3 strain, and to investigate the disease-modulating effects of the MHC region (RT1) in various genetic backgrounds. METHODS: A congenic fragment containing Ncf1 along with congenic fragments containing the strongest remaining loci, Pia5/Cia3 and Pia7/Cia13 on chromosome 4, were transferred from the arthritis-susceptible DA strain into the background of the completely resistant E3 strain. The arthritis-regulatory potential of the transferred alleles was evaluated by comparing the susceptibility to experimental arthritis in congenic rats with that in E3 rats. The RT1(u) haplotype from the E3 strain was transferred into the susceptible DA strain (RT1(av1)), and various F(1) and F(2) hybrids were generated to assess the effects of RT1 on arthritis susceptibility. RESULTS: The DA allele of Ncf1 did not break the arthritis resistance of the E3 rats, although it led to enhanced autoimmune B cell responses, as indicated by significantly elevated levels of anticollagen antibodies in congenic rats. Introgressing Pia5 and Pia7 loci on chromosome 4 broke the resistance to arthritis, and the MHC locus on chromosome 20 in DA rats enhanced arthritis when RT1 interacted with E3 genes. CONCLUSION: The findings in these congenic lines confirm the existence of 3 major QTLs that regulate the severity of arthritis and are sufficient to induce the transformation of a completely arthritis-resistant rat strain into an arthritis-susceptible strain. This study also reveals a dramatic difference in the arthritis-regulatory potential of the rat MHC depending on genetic background, suggesting that strong epistatic interactions occur between MHC and non-MHC genes.

RGD Manual Disease Annotations    Click to see Annotation Detail View
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
Experimental Arthritis susceptibilityIMP 2306838both collagen- and pristane-induced arthritisRGD 
Experimental Arthritis  IDA 2306838Induced by PristaneRGD 

Phenotype Annotations    Click to see Annotation Detail View

Mammalian Phenotype

TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
decreased susceptibility to induced joint inflammation  IDA 2306838Induced by PristaneRGD 
increased IgG level  IMP 2306838; 2306838compared to the parental E3/ZtmRhd ratsRGD 
joint inflammation  IDA 2306838Induced by PristaneRGD 
Objects Annotated

QTLs
Pia40  (Pristane induced arthritis QTL 40)

Objects referenced in this article
Strain DA/ZtmRhd null Rattus norvegicus
Strain E3/ZtmRhd null Rattus norvegicus
Strain SS.SR-(D3Arb14-D3Mco36)/Mco null Rattus norvegicus

Additional Information