Acetylcholinesterase cDNA sequencing and identification of mutations associated with organophosphate resistance in Cochliomyia hominivorax (Diptera: Calliphoridae)

Autor(es)

da Silva, Norma Machado ^{[1, 2]} ; de Carvalho, Renato Assis ^{[1, 2]} ; Lima de Azeredo-Espin, Ana Maria ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, UNICAMP, Inst Biol, Dept Genet & Evolucao, BR-13083875 Campinas, SP - Brazil

^[2] Univ Estadual Campinas, UNICAMP, Lab Genet & Evolucao Anim, CBMEG, BR-13083875 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Veterinary Parasitology; v. 177, n. 1-2, p. 190-195, APR 19 2011.
• Citações Web of Science: 3

Resumo

Altered acetylcholinesterase (AChE) has been identified in numerous arthropod species resistant to organophosphate (OP) and carbamate insecticides. The New World screwworm (NWS) Cochliomyia hominivorax (Coquerel), one of the most important myiasis-causing flies in the Neotropics, has been controlled mainly by the application of OP insecticides in its current geographical distribution. However, few studies have investigated insecticide resistance in this species. Based on previous studies about mutations conferring OP resistance in related dipteran species, AChE cDNA was sequenced allowing a survey for mutations (1298V. G401A, F466Y) in NWS populations. In addition, the G137D mutation in the carboxylesterase E3 gene, also associated with OP resistance, was analyzed in the same NWS populations. Only 2/135 individuals presented an altered AChE gene (F466Y). In contrast, a high frequency of the G137D mutation in the E3 gene was found in some localities of Brazil and Uruguay, while the mutant allele was not found in Cuba, Venezuela or Colombia. These findings suggest that the alteration in the carboxylesterase E3 gene may be one of the main resistance mechanisms selected in this ectoparasite. The knowledge of the frequency of these resistance-associated mutations in the NWS natural populations may contribute to the selection of appropriate chemicals for control as part of pest management strategies. (C) 2010 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 03/01458-9 - Isolamento e caracterizacao de marcadores microssatelites em moscas causadoras de miiases e sua utilizacao em estudos populacionais.
• Beneficiário: Ana Maria Lima de Azeredo-Espin
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 04/12532-8 - Isolamento e caracterização do gene da esterase relacionado a resistência a inseticidas organofosforados na mosca praga da pecuária Cochliomyia hominivorax (Diptera: Calliphoridae)
• Beneficiário: Renato Assis de Carvalho
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 07/54431-1 - Investigação genética da resistência a inseticidas organofosforados e piretróides na mosca praga da pecuária Cochliomya hominivorax (Diptera: Calliphoridae)
• Beneficiário: Ana Maria Lima de Azeredo-Espin
• Modalidade de apoio: Auxílio à Pesquisa - Regular