Biochemical Genetics

, Volume 11, Issue 1, pp 49–63 | Cite as

Genetics of cytochrome P450 in two insecticide-resistant strains of the housefly, Musca domestica L.

  • L. G. Tate
  • F. W. PlappJr.
  • E. Hodgson


A susceptible strain of Musca domestica containing visible mutant markers on chromosomes II, III, and V was crossed with multiresistant R-Fc and R-diazinon strains. F1 flies were backcrossed to the mutant parent, resultant progenies were isolated according to phenotype, and substrains were established. The level of resistance to diazinon, aldrin epoxidase activity, and cytochrome P450 difference spectra of microsomes from each substrain were measured. Titers of cytochrome P450, measured as CO spectra, as well as type I, type II, and type III cytochrome P450 substrate difference spectra were compared in microsomal preparations obtained from phenotypes containing vatious resistant chromosome combinations. In both resistant strains, high levels of cytochrome P450 were controlled by a gene(s) on chromosome II. In R-diazinon, qualitative spectral changes were also controlled by chromosome II, whereas in R-Fc both chromosomes II and V contributed to qualitative changes in cytochrome P450. Both quantitative and qualitative characteristics were intermediate in heterozygous flies, suggesting incomplete dominance for their inheritance. Findings are discussed in relation to known genetics of microsomal resistance to insecticides.

Key words

cytochrome P450 microsomes binding spectra Musca domestica L. mixed-function oxidases 


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Copyright information

© Plenum Publishing Corporation 1974

Authors and Affiliations

  • L. G. Tate
    • 1
  • F. W. PlappJr.
    • 2
  • E. Hodgson
    • 1
  1. 1.Department of EntomologyNorth Carolina State UniversityRaleigh
  2. 2.Department of EntomologyTexas A & M UniversityCollege Station

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