OGG1 KO Mouse
- References (2)
- Inventor Info
|Antigen/Gene or Protein Targets
|Lung cancer, ovarian cancer
|OGG1 defect together with MYH defect causes greatly increased frequency of lung cancer. Knockout mice have been generated deficient in the OGG1 DNA glycosylase that excises the most frequent mutagenic oxidative base lesion, 8-oxoG. It has been shown that (i) 8-oxoG residues accumulate in the genome to substantially increased levels in the nonproliferating liver of ogg1 null mice; (ii) there is no excision of 8-oxoG initiated by a different DNA glycosylase in cell-free tissue extracts, but there is significant slow repair in an ogg1 null cell line; (iii) the in vivo spontaneous mutation frequency is increased (2- to 3-fold) in liver but not in more rapidly proliferating testis; and (iv) ogg1 null mice do not show an increased tumor incidence, although inactivating mutations in the OGG1 gene have been documented in a small number of sporadic human lung, kidney, gastric, and head-and-neck tumors.
|Briefly, a partial murine OGG1 cDNA clone was isolated by reverse transcription PCR and used to screen a mouse 129SV lambda genomic library. Approximately 4.6 kb of genomic DNA including this motif were replaced by the neomycin-resistance gene/polyadenylation signal (Neo) in the targeting construct by cloning a flanking 3.1-kb XhoI fragment (5') into the XhoI site of pSK-MC1-NEO-poly(A) and a flanking 4.7-kb HindIII fragment (3') into the BamHI site. The targeting vector was electroporated into GK129 embryonic stem (ES) cells from 129SV mice. An ES clone in which homologous recombination had occurred in one allele of the ogg1 gene was expanded from a duplicate plate and injected into blastocysts from C57BL/6J mice. Resultant chimeras were mated and agouti F1 progeny were screened by tail biopsy. Mice heterozygous for the targeted ogg1 allele (+/-) were interbred, and F2 progeny were genotyped.
|Homozygous -/- mutant mice indistinguishable from their +/- heterozygous and +/+ wild-type siblings
|Cancer, DNA Damage and Repair, Epigenetics & Nuclear Signalling, Genetic Studies Tools
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