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Targeted Allele Detail
Symbol: Nfkb1tm1Bal
Name: nuclear factor of kappa light polypeptide gene enhancer in B cells 1, p105; targeted mutation 1, David Baltimore
MGI ID: MGI:1857225
Synonyms: Nfkappab1-, NF-kappaB1-, NFkappaB10, NF-kappaB1 KO, NF-kappaBtm1Bal, Nfkb1-, p105-, p50-, p50KO
Gene: Nfkb1  Location: Chr3:135584655-135691547 bp, - strand  Genetic Position: Chr3, 62.82 cM
Germline Transmission:  Earliest citation of germline transmission: J:37184
Parent Cell Line:  E14 (ES Cell)
Strain of Origin:  129P2/OlaHsd
Allele Type:    Targeted (Null/knockout)
Mutation:    Insertion
Mutation detailsInsertion of a PGK-neomycin resistance cassette into exon 6 disrupted the gene. Exon 6 encodes the p105 precursor of the p50 subunit of the encoded transcription factor. The authors predict that this allele produces a truncated polypeptide that cannot bind with DNA, or dimerize with itself or other kappaB binding motifs. (J:37184)
View phenotypes and curated references for all genotypes (concatenated display).
In Structures Affected by this Mutation: 8 anatomical structures
Find Mice (IMSR)
Mouse strains and cell lines available from the International Mouse Strain Resource (IMSR)
Carrying this Mutation:  Mouse Strains: 3 strains available      Cell Lines: 0 lines available
Carrying any Nfkb1 Mutation:  90 strains or lines available

Effect of reconstitution with Nfkb1tm1Bal homozygous hematopoietic cells on atherogenesis in atherosclerosis prone mice

To assess the role of NFKB1 in atherogenesis, mice homozygous for a mutation of the low density lipoprotein receptor (Ldlrtm1Her) were lethally irradiated and transplanted with bone marrow from Nfkb1tm1Bal homozygous mice and 4 weeks later placed on a high-fat diet for 10 weeks. Aortic root lesion area of mice with NFKB1-deficient hematopoietic cells was 41% smaller than in control mice. Whereas control lesions contained primarily large foam cells, lesions of mice reconstituted with NFKB1-deficient bone marrow contained large numbers of small, inflammatory cells and very few foam cells. 3-fold as many cells attached to the lesion cap in transplanted mice. Most cells in control lesions were macrophages, while in transplanted mice there was a preponderance of T and B lymphocytes.

Macrophages induced to differentiate in culture from NFKB1-deficient bone marrow exhibited differences compared to control macrophages in the secretion patterns of several cytokines following lipopolysaccharide (LPS) stimulation. Whereas control macrophages expressed high levels of scavenger receptor class A (SR-A) in response to LPS, this response was greatly attenuated in mice with NFKB1-deficient hematopoietic systems; uptake of oxidized low density lipoprotein (oxLDL) was similarly diminished, although neither parameter differed between transplant and control macrophages in the absence of stimulation. J:87639

Original:  J:37184 Sha WC, et al., Targeted disruption of the p50 subunit of NF-kappa B leads to multifocal defects in immune responses. Cell. 1995 Jan 27;80(2):321-30
All:  224 reference(s)

Contributing Projects:
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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