Induction of mutation in Escherichia coli by freeze-drying

Tanaka, Yoshinori; Yoh, Muneoki; Takeda, Yoshiro; Miwatani, Toshio

doi:10.1128/aem.37.3.369-372.1979

Cited by 19 publications

(2 citation statements)

References 12 publications

(10 reference statements)

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“…The changes of water content within and around the bacterial chromosome could be directly included in the change of the DNA structure (10,12). Tanaca et al maintain that the DNA damage caused by lyophilization could be similar to that caused by X-ray treatment (18). Ohnishi et al reports a recovery of considerable part of the DNA damages rehydration, when the bacterium produces recovery enzymes (15).…”

Section: Resultsmentioning

confidence: 99%

The Stability of the Biochemical Parameters of E. Coli with Different Methods of Preservation

Mehandjiyska

Donev

Karadjov

1995

Biotechnology & Biotechnological Equipment

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The effect of four routine methods of preservation of bacteria (in Dorset medium, under mineral oil, freeze-drying, cryoconservation in liquid nitrogen) on the biochemical characteristics of 11 E. coli strains from the collection of NBIMCC, was followed up. After 1 and 3 years of preservation, half of the strains changed their biochemical activity, 33 % of the parameters examined having turned into negative. The biochemical characteristics of the strains studied turned out to best preserved in Dorset medium and under mineral oil. Freezedrying is appropriate for long-term preservation but it requires additional following up of the biochemical parameters.

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Section: Resultsmentioning

confidence: 99%

The Stability of the Biochemical Parameters of E. Coli with Different Methods of Preservation

Mehandjiyska

Donev

Karadjov

1995

Biotechnology & Biotechnological Equipment

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“…These data, therefore, support the hypothesis that DNA strand breakage is the cause of dryinginduced mutation. Ashwood-Smith and Grant (2) and Tanaka et al (13,14) have reported the breakage of DNA and the induction of mutation in freeze-dried E. coli. However, the detailed mechanisms still remained unclear.…”

Section: Discussionmentioning

confidence: 99%

Mutation induced by drying of Escherichia coli on a hydrophobic filter membrane

Asada¹,

Takano²,

Shibasaki³

1980

Appl Environ Microbiol

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Drying of Escherichia coli to a required cellular water level was conducted on a hydrophobic membrane at the corresponding relative humidity. Mutation from an arginine auxotroph to the prototroph was induced by drying to a water activity (au,) of 0.53 and below, but not to an a,, of 0.75 and above. The critical a,,. below which mutation occurred in the course of drying was similar to that for induction of deoxyribonucleic acid (DNA) strand breakage in the bacteria. Some ultraviolet or-y-irradiation-sensitive strains, e.g., strains carrying recA, recB, and uvrA recA were more sensitive to drying than the wild-type strains or strains carrying uvrA and polA. The DNA strand breakage of every strain was observed to be to a similar extent after drying to an a,,. of <0.53. The drying-resistant strains repaired the damaged DNA partially during postdrying incubation in a growth medium but not in phosphate buffer solution, while the drying-sensitive strains could not at all. Significant mutation on drying occurred in the wild-type strains, strains carrying uvrA andpolA, but not in strains carrying recA. It is, therefore, concluded that the mutation is caused by errors in rec-dependent repair of the dryinginduced breakage in DNA. Induction of mutation by several methods of drying has been found in various bacteria and yeasts (2, 5, 7, 12, 14, 18), but no detailed work has been done on the cause of mutation except for some on freeze-drying (2, 9, 14). We devised a new method of drying, in which bacteria on a hydrophobic membrane were equilibrated quickly at a given relative humidity (RH) being dried to the corresponding water activity (a,,). Using this method we found in a previous work (1) that single-strand breaks of deoxyribonucleic acid (DNA) were induced at an a, of 0.53 and below during the drying of Escherichia coli, depending on the final cellular water level, aw. Mutagenesis in bacteria is generally thought to occur as a result of errors in the repair of damaged DNA (20, 21). Therefore, such DNA breaks induced by drying might be the cause of induction of mutation if the breakage was the only damage to DNA. To obtain positive proof for the hypothesis, we investigated, in this work, the a,, dependency of induction of mutation and the repair mechanism of strand breaks of DNA. MATERIALS AND METHODS Bacterial strains. E. coli F3294 (wild type for repair, argF), F3295 (uvrA hcr argF), F3296 (polA argF), and F3297 (recA phr argF), were used in the mutation experiments.

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Mutagenesis

Crueger

1992

Biotechnology

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Induction of mutation in Escherichia coli by freeze-drying

Cited by 19 publications

References 12 publications

The Stability of the Biochemical Parameters of E. Coli with Different Methods of Preservation

The Stability of the Biochemical Parameters of E. Coli with Different Methods of Preservation

Mutation induced by drying of Escherichia coli on a hydrophobic filter membrane

Mutagenesis

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