Biochemical Genetics

, Volume 30, Issue 1–2, pp 13–26 | Cite as

Identification of two distinct amplifications of the esterase B locus inCulex pipiens (L.) mosquitoes from mediterranean countries

  • Marylène Poirié
  • Michel Raymond
  • Nicole Pasteur


Two new highly active esterases were detected by starch electrophoretic studies inCulex pipiens mosquitoes from the area of Montpellier (France) and from Cyprus. We demonstrate here that both the French and the Cyprus esterases B are overproduced due to amplification of the coding gene. The production of the esterase B is approximately 50- and 500-fold higher in mosquitoes from France and Cyprus, respectively, than in susceptible insects, whereas the number of gene copies is about 25 and 250. Differences of about 7- and 95-fold were also found in the degree of chlorpyrifos resistance. RFLP comparison of the amplified region containing the esterase B gene revealed large differences between French and Cyprus mosquitoes. It thus appears that two distinct haplotypes with an esterase B gene coding an enzyme with identical electrophoretic mobility have been amplified. We therefore named the haplotypes in mosquitoes from France and Cyprus B4 and B5, respectively. The estimated genetic distance between these two haplotypes is not smaller than those observed in all pair comparisons of other known esterase B haplotypes. These results are discussed in the context of amplification phenomena.

Key words

mosquito esterase B locus amplification 


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Copyright information

© Plenum Publishing Corporation 1992

Authors and Affiliations

  • Marylène Poirié
    • 1
  • Michel Raymond
    • 1
  • Nicole Pasteur
    • 1
  1. 1.Laboratoire de Génétique et Environnement, Case courrier 64, Institut des Sciences de l'Evolution (CNRS, URA 327)Université Montpellier IIMontpellier 05France

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