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Polymerase chain reaction‐based identification of insecticide resistance genes and DNA methylation in the aphid Myzus persicae (Sulzer)

The ability of a peach‐potato aphid (Myzus persicae) to resist insecticides can depend on both the presence of amplified esterase genes and on differences in their expression. Here we report a polymerase chain reaction‐restriction enzyme (PCR‐REN) technique which can detect the presence of ampiifled esterase genes and distinguish between the two possible types of amplified gene (E4 and FE4) and a homologous fragment from susceptible aphids. The technique is quick and sensitive enough to be used on a fraction of an aphid or an individual embryo. Furthermore, it can be combined with a pre‐PCR digestion using a methylation‐sensitive enzyme (Hpail) to determine whether or not the esterase genes contain 5–methyicytosine, the presence or absence of which is known to correlate with changes in gene expression.