B6;129P-Psen1^tm1Vln/J

Stock number: 007605
Research areas: Mouse/Human Gene Homologs, Neurobiology Research, Research Tools

Description

These PS1-floxed mice may be useful in generating conditional knockouts of Presenilin 1 for studying Alzheimer’s Disease.

Detailed description

These mice possess loxP sites on either side of exon 7 of the targeted gene. Mice that are homozygous for this allele are viable, fertile, normal in size and do not display any gross physical or behavioral abnormalities. When these "floxed" mice are bred to mice that express Cre recombinase, resulting offspring can have one of three resulting genotypes (only exon 7 deleted, only the neo selection cassette deleted, or both exon 7 and the neo selection cassette deleted) in the cre-expressing tissue(s). These PS1-floxed mice may be useful in generating conditional knockouts of Presenilin 1 for studying Alzheimer's Disease.

For example, when crossed to a strain expressing Cre recombinase in postnatal neurons (see Stock No. 006143), this mutant mouse strain may be useful in studies of amyloid plaque formation.

Development

A loxP site flanked targeting vector containing a neomycin resistance gene was utilized in the construction of this mutant. This selection cassette was inserted downstream of exon 7 of the targeted gene, and another loxP site was inserted upstream of exon 7. This construct was electroporated into 129P2/OlaHsd derived E14 embryonic stem (ES). Correctly targeted ES cells were injected into recipient blastocysts. The donating investigator reports that these mice were then backcrossed to C57BL/6 for 7 generations prior to arrival at The Jackson Laboratory. Upon arrival, mice were bred with C57BL/6J for one generation to establish the colony (see note below).

NOTE: A 27 SNP (single nucleotide polymorphism) panel analysis performed by The Jackson Laboratory revealed a single loci that typed as homozygous for 129/P strain type (chromosome 12 approximately 9.8 cM) and three additional loci that were segregating for either C57BL/6J or 129/P strain type (chromosome 1 approximately 52.0 cM, chromosome 4 approximately 10.9 cM, and chromosome 8 approximately 4.4 cM). Therefore, these mice are determined to be on a mixed B6;129P genetic background (August 2008).

Allele

Symbol: Psen1^tm1Vln
Name: targeted mutation 1, Fred Van Leuven
MGI accession ID: MGI:2684616
Generation method: Targeted
Attributes: Conditional ready (e.g. floxed); No functional change
Marker symbol: Psen1
Marker name: presenilin 1
Chromosome: 12
Strain of origin: 129P2/OlaHsd
Molecular note: Exon 7 was flanked by a single loxP site in intron 6 and floxed neo cassette in intron 7.