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. 1979 Jan;76(1):373–376. doi: 10.1073/pnas.76.1.373

Single-step selection of clones of a mouse hepatoma line deficient in aryl hydrocarbon hydroxylase.

O Hankinson
PMCID: PMC382941  PMID: 106390

Abstract

The mouse hepatoma line Hepa-1 has high and inducible aryl hydrocarbon (benzo[a]pyrene) hydroxylase[benzo[a]pyrene, reduced-flavoprotein:oxygen oxidoreductase (3-hydroxylating), EC 1.14.14.2] activity. Fourteen subclones of a clonal derivative of Hepa-1 were isolated and shown not to display heterogeneity in aryl hydrocarbon hydroxylase activity beyond what could be ascribed to experimental error. Hepa-1 was found to be very sensitive to benzo[a]pyrene (BaP) toxicity and a single-step selection procedure for isolating clones resistant to BaP at 4 microgram/ml was designed. Those BaP-resistant variants tested had much reduced aryl hydrocarbon hydroxylase activities under both inducing and noninducing conditions and they retained their resistance to BaP and low aryl hydrocarbon hydroxylase activities over considerable periods of time of culture in the absence of BaP. The spontaneous rate of origin of the BaP-resistant clones was estimated, by Luria-Delbrück fluctuation analysis, to be 2 X 10(-7) events per cell per generation. It is concluded that the properties of the variants are consistent with the notion that they are mutational in origin and that this system is a promising one for carrying out a somatic cell genetic analysis of aryl hydrocarbon hydroxylase.

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Selected References

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