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Selection for nonzero mutation rate

bickle at urz.unibas.ch bickle at urz.unibas.ch
Thu Oct 1 02:47:36 EST 1992

In article <4003 at fcs280s.ncifcrf.gov>, toms at fcs260c2.ncifcrf.gov (Tom Schneider) writes:
> Bacteriophage T4 DNA polymerase apparently has mutations which decrease the
> rate of mutation formation.  So mutation rate is under genetic control.  Sorry,
> I don't know a direct referece.

The T4 DNA polymerase has mutations which work both ways: antimutators which
decrease mutation rates have either increased proof-reading 3'-5'
exonuclease activity or reduced affinity for the wrong precursors.
Mutators with *increased* mutation rates have, as I recall, a decreased
proof-reading activity.

See chapter 4 in DNA replication and mutagenesis (R.E. Moses and
W.C. Summers eds.) ASM 1988 ISBN 1-55581-003-9 for a reasonably recent 

Tom Bickle
Dept of Microbiology
Biozentrum, Basel U.
Basel Switzerland  

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