Biochemical and molecular analysis of deltamethrin resistance in the common bed bug (Hemiptera: Cimicidae)

J Med Entomol. 2008 Nov;45(6):1092-101. doi: 10.1603/0022-2585(2008)45[1092:bamaod]2.0.co;2.

Abstract

This study establishes deltamethrin resistance in a common bed bug, Cimex lectularius L., population collected from New York City (NY-BB). The NY-BB population was 264-fold more resistant to 1% deltamethrin in contact bioassay compared with an insecticide-susceptible population collected in Florida (FL-BB). General esterase, glutathione S-transferase, and 7-ethoxycoumarin O-deethylase activities of NY-BB were not statistically different from those of FL-BB. cDNA fragments that encoded the open reading frame of voltage-sensitive sodium channel alpha-subunit genes from the FL-BB and NY-BB populations, respectively, were obtained by homology probing polymerase chain reaction (PCR) and sequenced. Sequence alignment of the internal and 5' and 3' rapid amplification of cDNA ends (RACE) fragments generated a 6500-bp cDNA sequence contig, which was composed of a 6084-bp open reading frame (ORF) encoding 2027 amino acid residues and 186-bp 5' and 230-bp 3' untranslated regions (5' and 3' UTRs, respectively). Sequence comparisons of the open reading frames of the alpha-subunit genes identified two point mutations (V419L and L925I) that were presented only in the NY-BB population. L925I, located the intracellular loop between IIS4 and IIS5, has been previously found in a highly pyrethroid-resistant populations of whitefly (Bemisia tabaci). V419L, located in the IS6 transmembrane segment, is a novel mutation. A Val to Met mutation at the corresponding position of the bed bug V419, however, has been identified in the tobacco budworm as a kdr-type mutation. This evidence suggests that the two mutations are likely the major resistance-causing mutations in the deltamethrin-resistant NY-BB through a knockdown-type nerve insensitivity mechanism.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Bedbugs / enzymology
  • Bedbugs / genetics*
  • Cloning, Molecular
  • Insecticide Resistance / genetics*
  • Insecticides / pharmacology*
  • Molecular Sequence Data
  • New York City
  • Nitriles / pharmacology*
  • Polymerase Chain Reaction
  • Pyrethrins / pharmacology*
  • Sequence Alignment
  • Sequence Analysis, DNA
  • Sodium Channels / genetics*

Substances

  • Insecticides
  • Nitriles
  • Pyrethrins
  • Sodium Channels
  • decamethrin