Summary |
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Variant origin |
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Variant description |
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Phenotypes |
View phenotypes and curated references for all genotypes (concatenated display).
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Notes |
The recessive nature of this allele was not apparent in the initial intercross and backcross study.
Mapping and Phenotype information for this QTL, its variants and associated markersJ:122128Linkage analysis was performed on 100 females from a (C57BL/6JIco x DBA/2NCrl)F1 x C57BL/6JIco backcross and 90 female animals from a (C57BL/6JIco x DBA/2NCrl)F2 intercross to identify QTLs associated with TNF-induced lethal shock. A panel of 69 microsatellite markers was used for genome scan. Animals were injected with 75 ug TNF at 8-12 weeks of age and scored over 5 days. C57BL/6JIco exhibits high TNF sensitivity with almost all animals dying at a 20 ug dose, whereas DBA/2NCrl and (C57BL/6JIco x DBA/2NCrl)F1 animals survive up to 100 ug doses. A major resistance locus mapped to 51 cM on mouse Chromosome 6 near D6Mit150 (LRS=18.1). This locus was confirmed using a chromosome substitution line at generation N9 carrying a DBA/2NCrl-derived donor chr 6 ona C57BL/6JIco genetic background (C57BL/6JIco-Chr 6DBA/2NCrl). Homozygous and heterozygous C57BL/6JIco-Chr 6DBA/2NCrl animals were significantly more resistant to TNF-induced lethal shock compared to C57BL/6JIco controls, but were not as resistant asDBA/2NCrl. In addition, tumor-bearing homozygous C57BL/6JIco-Chr 6DBA/2NCrl animals can withstand a 10-day treatment of TNF/INF-gamma resulting in complete tumor remission. Subcongenic line analysis narrowed the QTL interval to a 13.2 Mb region betweenD6Mit54 (48.2 cM, 113.2 Mb) and D6Mit254 (60.55 cM, 126.2 Mb). This locus colocalizes with Tilss1 (45 cM), a TNF resistance QTL previously identified by the same authors. Potential candidate genes identified by SNP analysis and include Alox5 (53.2 cM), A2m (61.7 cM), and Tnfrsf1a (60.55 cM).04.13.2015 Curators Note: Because Tilss1 was orginally mapped in J:77727 in 2003 using a (C57BL/6 x SPRET/Ei)F1 x C57BL/6 backcross, which differs from the cross used here, we consider this a sparate map study and have named the QTL Tilss4.A second resistance locus mapped to 53 cM on mouse Chromosome 17 near D17Mit41 (LRS=7) and was confirmed in the C57BL/6JIco-Chr 17DBA/2NCrl chromosome substitution (CS) line. However, only homozygous CS animals displayed resistance to TNF-induced lethal shock indicating this locus exhibits a recessive effect. This QTL is designated Tilss3 (TNF-induced lethal shock susceptibility 3). |
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References |
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Mouse Genome Database (MGD), Gene Expression Database (GXD), Mouse Models of Human Cancer database (MMHCdb) (formerly Mouse Tumor Biology (MTB)), Gene Ontology (GO) |
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last database update 10/22/2024 MGI 6.24 |
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