Abstract
Variation in the human mitochondrial DNA (mtDNA) sequence has been extensively analysed using restriction fragment length polymorphisms (RFLPs)1–11. MtDNA RFLPs have previously been attributed to nucleotide changes within restriction endonuclease recognition sites1–10 or to small insertion–deletion mutations11. We now report that RFLPs detected by polyacrylamide gel electrophoresis can also result from single nucleotide substitutions which alter the mobility of small- to medium-sized restriction fragments that incorporate the sequence. We have defined the mutation responsible at two loci and have identified several possible additional loci. When screening human mtDNAs with multiple restriction endonucleases, such mutations can be misidentified as insertion–deletion mutations or counted as multiple polymorphic restriction sites. This can lead to errors in constructing restriction maps and estimating sequence diversity.
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Singh, G., Neckelmann, N. & Wallace, D. Conformational mutations in human mitochondrial DNA. Nature 329, 270–272 (1987). https://doi.org/10.1038/329270a0
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DOI: https://doi.org/10.1038/329270a0
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