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. 1993 Aug 15;90(16):7671–7675. doi: 10.1073/pnas.90.16.7671

In vivo and in vitro evidence for slipped mispairing in mammalian mitochondria.

C S Madsen 1, S C Ghivizzani 1, W W Hauswirth 1
PMCID: PMC47204  PMID: 8356068

Abstract

Slipped mispairing between repeated sequences during DNA replication is an important mutagenic event. It is one of several suggested mechanisms thought to be responsible for generating polymorphic regions and large-scale deletions found in mammalian mitochondrial DNA. In the porcine mitochondrial genome, a domain carrying a 10-bp tandemly repeated sequence displays a unique in vivo pattern of repeat copy number polymorphs. Upon passage in Escherichia coli, a recombinant plasmid containing this domain also displays a unique polymorphic pattern that is different from that seen in the animal. To test the hypothesis that these polymorphisms were slippage induced and that the different polymorphic patterns reflected differences in modes of replication, we performed a series of in vitro primer extension reactions. By utilizing either single- or double-stranded templates containing the repeat domain we were able to correlate in vitro generated repeat polymorphism patterns with those seen in the mitochondria or the bacteria, respectively, thus providing experimental evidence that slippage replication is responsible for a major class of mammalian mutations.

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