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Mismatch repair is diminished during stationary-phase mutation
1Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT, USA.
Mutation Research
|July 30, 1999
Summary
This study demonstrates that mismatch repair proteins are crucial during stationary-phase mutation, contrary to recent commentary. Accurate mutation rate measurements confirm decreased mismatch repair capacity during this phase.
Area of Science:
- Microbiology
- Genetics
- Molecular Biology
Background:
- A recent commentary questioned the role of mismatch repair in adaptive mutations during stationary phase.
- The commentary also challenged the methodology used to measure growth-dependent mutation rates.
Purpose of the Study:
- To provide further data supporting the accuracy of mutation rate measurements.
- To reaffirm that mismatch repair proteins become limiting during stationary-phase mutation.
Main Methods:
- Utilized a mutation rate measurement method counting mutant colonies as they arise.
- Presented data to validate this dynamic counting approach for accuracy.
Main Results:
- Demonstrated the necessity of dynamic colony counting for accurate mutation rate determination.
- Reiterated findings that mismatch repair proteins are not limiting during growth-dependent mutation.
- Showcased evidence that mismatch repair capacity decreases during stationary-phase mutation.
Conclusions:
- The evidence strongly supports a role for decreased mismatch repair capacity in stationary-phase mutations.
- The data presented in the commentary do not invalidate the conclusion that mismatch repair is limiting during stationary phase.