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Reading Dawkins' book "The Selfish Gene," I came across this line: "There are even genes--called mutators--that manipulate the rates of copying errors in other genes." (The context is his argument that such a gene is looking out for its best interest by killing off the competition.)

What are these "mutator" genes, and how do they function?

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Most obvious examples are the genes directly involved in DNA mismatch repair (MMR) such as mutS, mutL, mutH, MLH1 and MLH2.

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