A transgenic Neospora caninum strain based on mutations of the dihydrofolate reductase-thymidylate synthase gene

Autor(es)

Pereira, Luiz Miguel ^[1] ; Baroni, Luciana ^[1] ; Yatsuda, Ana Patricia ^{[2, 3]}

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Nucleo Apoio Pesquisa Prod Nat & Sintet, BR-14040903 Ribeirao Preto, SP - Brazil

^[2] Univ Sao Paulo, Fac Ciencias Farmaceut Ribeirao Preto, BR-14040903 Ribeirao Preto, SP - Brazil

^[3] Univ Sao Paulo, Fac Ciencias Farmaceut Ribeirao Preto, BR-14040903 Ribeirao Preto - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Experimental Parasitology; v. 138, p. 40-47, MAR 2014.
• Citações Web of Science: 6

Resumo

Neospora caninum is an Apicomplexa parasite related to abortion and losses of fertility in cattle. The amenability of Toxoplasma gondii and Plasmodium to genetic manipulation offers several tools to determine the invasion and replication processes, which support posterior strategies related to the combat of these diseases. For Plasmodium the use of pyrimethamine as an auxiliary drug on malaria treatment has been affected by the rise of resistant strains and the analyses on Dihydrofolate reductase-thymidylate synthase (DHFR-TS) gene indicated several point mutations. In this work we developed a method for stable insertion of genes based on resistance to pyrimethamine. For that, the coding sequence of NcDHFR-TS (Dihy-drofolate reductase-thymidylate synthase) was point mutated in two amino acids, generating DHFRM2M3. The DHFRM2M3 flanked by the promoter and 3 ` UTR of Ncdhfr-ts (Ncdhfr-DHFRM2M3) conferred resistance to pyrimethamine after transfection. For illustration of stability and expression, the cassette Ncdhfr-DHFRM2M3 was ligated to the reporter gene Lac-Z (beta-galactosidase enzyme) controlled by the N. caninum tubulin promoter and was transfected and selected in N. caninum. The cassette was integrated into the genome and the selected tachyzoites expressed Lac-Z, allowing the detection of tachyzoites by the CPRG reaction and X-gal precipitation. The obtainment of transgenic N. caninum resistant to pyrimethamine confirms the effects on DHFR-TS among the Apicomplexa members and will support future approaches on pholate inhibitors for N. caninum prophylaxis. The construction of stable tachyzoites based on vectors with N. caninum promoters initiates the molecular manipulation of this parasite independently of T. gondii. 2014 Published by Elsevier Inc. (AU)

• Processo FAPESP: 05/53785-9 - Proteínas envolvidas na invasão de células hospedeiras por protozoários apicomplexas como potenciais componentes para métodos profiláticos
• Beneficiário: Ana Patricia Yatsuda Natsui
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 09/07713-7 - Avaliação funcional da proteína anônima relacionada à trombospondina 2 de Neospora caninum (NcMIC2-like1)
• Beneficiário: Luiz Miguel Pereira
• Modalidade de apoio: Bolsas no Brasil - Doutorado