Research models

List of models

Nomenclature: SJL/JRj

Type: Inbred mouse
Colour and related genotype: Albino mouse, A/A, Tyrc/Tyrc, Oca2p/Oca2p - MHC: Haplotype H2s
Origin: Zentralinstitut für Versuchstierzucht (Hannover) - 1988 (F109)
Breeding: Difficult to rear

Fields of research

  • Behaviour
  • Cardiology
  • Immunology
  • Oncology: model for Hodgkin's disease
  • Transgenesis

Description of our model

Created in 1955 by James Lambert (The Jackson Laboratory), from three sources of SWISS WEBSTER outbred stock that were brought to The Jackson Laboratory between 1938 and 1943, when brother-sister matings started.

SJL/JRj mice show a high incidence of reticulum cell sarcomas, as in Hodgkin’s disease, around year one of age. These sarcomas first appear in aggregated lymphoid nodules (Peyer’s patches) and mesenteric lymph nodes and then in the spleen and liver, the thymus and other lymph nodes. Most of these tumours are of mixed cells and classified as type B reticulum cell neoplasms but some are type A histiocytomas.

This strain is also characterized by the aggressiveness of its males and its sensitivity to experimental autoimmune encephalomyelitis (EAE) in multiple sclerosis research. It also develops spontaneous myopathy due to a mutation in the Dysferlin gene. It has been demonstrated that the Dysfm allele leads to a decrease in the level of Dysferlin protein in SJL mice which renders them a good model for the study of Limb girdle muscular dystrophy 2B (LGMD 2B). This myopathy is characterized by a progressive loss of muscular mass and strength; muscular pathology can go as far as necrosis of the fibers and their replacement by fat. Although muscular weakness can be detected at 3 weeks of age, the greatest complications occur after 6 months of age.

SJL/JRj mice are immunocompetent, they show decreased NK activity and higher levels of circulating T cells. SJL/JRj mice are resistant to Diet-induced-obesity (DIO).

Our added value

  • The « JANVIER LABS Genetic Policy », a specific programme, guarantees homozygosity of autosomal pairs.
  • Animals with the SPF or SOPF standards.
  • A gentling policy for docile and easy-to-handle animals.
  • Optimal stability conditions of our models during shipments, thanks to our dedicated and internal transport service.
  • A scientific support with a team of Veterinarians and PhD.

Download the corresponding health monitoring reports

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