The extensive expansion of the P450 family in Ae. aegypti [30]
and the finding that multiple enzymes are able to metabolise pyrethroids
[15] suggest that there are multiple putative means by
which Ae. aegypti could develop metabolic resistance to pyrethroids.
However, the identification of a subset of genes, consistently
over expressed in resistant population, suggests that the
development of specific inhibitors targeting certain subfamilies
of detoxification enzymes might be possible [15].
Other detoxification genes, such as the glutathione transferases
GSTE2 and GSTE3 were also found over expressed in an Ae. aegypti
permethrin resistant strain from Mexico (Table 2, [30]). The application
of RNA silencing techniques has demonstrated the importance
of GSTs (GSTE2 and GSTE7), in conferring pyrethroid resistance [34]
but the mechanism by which this occurs remains unresolved [35].