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• W2087204611 endingPage "216" @default.
• W2087204611 startingPage "205" @default.
• W2087204611 abstract "The ΦX174 transgenic mouse was first developed as an in vivo Ames test, detecting base pair substitution (bps) at a single bp in a reversion assay. A forward mutational assay was also developed, which is a gain of function assay that also detects bps exclusively. Later work with both assays focused on establishing that a mutation was fixed in vivo using single-burst analysis: determining the number of mutant progeny virus from an electroporated cell by dividing the culture into aliquots before scoring mutants. We review results obtained from single-burst analysis, including testing the hypothesis that high mutant frequencies (MFs) of G:C to A:T mutation recovered by transgenic targets include significant numbers of unrepaired G:T mismatches. Comparison between the ΦX174 and lacI transgenes in mouse spleen indicates that the spontaneous bps mutation frequency per nucleotide (mfn) is not significantly lower for ΦX174 than for lacI; the response to ENU is also comparable. For the lacI transgene, the spontaneous bps mfn is highly age-dependent up to 12 weeks of age and the linear trend extrapolates at conception to a frequency close to the human bps mfn per generation of 1.7 × 10−8. Unexpectedly, we found that the lacI somatic (spleen) bps mfn per cell division at early ages was estimated to be the same as for the human germ-line. The bps mfn in bone marrow for the gpt transgene is comparable to spleen for the lacI and ΦX174 transgenes. We conclude that the G:C to A:T transition is characteristic of spontaneous in vivo mutation and that the MFs measured in these transgenes at early ages reflect the expected accumulation of in vivo mutation typical of endogenous mammalian mutation rates. However, spontaneous and induced mfns per nucleotide for the cII gene in spleen are 5–10 times higher than for these other transgenes." @default.
• W2087204611 created "2016-06-24" @default.
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• W2087204611 date "2010-12-01" @default.
• W2087204611 modified "2023-10-16" @default.
• W2087204611 title "In vivo mutation analysis using the ΦX174 transgenic mouse and comparisons with other transgenes and endogenous genes" @default.
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• W2087204611 doi "https://doi.org/10.1016/j.mrrev.2010.07.001" @default.
• W2087204611 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20637298" @default.
• W2087204611 hasPublicationYear "2010" @default.
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