Transcrição de genes de proteínas de membrana de isolados brasileiros de Anaplasma marginale

This work shows the transcription profile of membrane protein genes in three Brazilian isolates of Anaplasma marginale (Rio Grande do Norte, Pernambuco-Zona da Mata, and Pernambuco-Sertão). RNA was purified from cattle blood experimentally-infected with the three isolates of A. marginale. After reverse transcription, genes omp1, 2, 3, 4, 5, 7, 8, 9, 10, 11, 12, 13, and 14; opag1-3; virB3, 9, and 10; am097, 197, 254, 854, and 956 were amplified by PCR, with specific primers. Transcripts were detected for all genes, except omp2, 3 e opag3 in all isolates and for omp7 in one out of the three isolates analyzed. Absence of transcription for opag3 and omp7 diverge from the North American isolates of A. marginale. Reasons for such differences were discussed.

Este trabalho demonstra o padrão de transcrição de genes de proteínas de membrana em três isolados brasileiros de A. marginale (Rio Grande do Norte, Pernambuco-Zona da Mata e Pernambuco-Sertão). O RNA foi purificado a partir de sangue de bovinos infectados experimentalmente com os três isolados de A. marginale. Após transcrição reversa, os genes omp1, 2, 3, 4, 5, 7, 8, 9, 10, 11, 12, 13 e 14; opag1-3; virB3, 9, 10; am097, 197, 254, 854 e 956 foram amplificados por PCR, com oligonucleotídeos iniciadores específicos. Detectaram-se transcritos para todos os genes analisados, exceto omp2, 3 e opag3 em todos os isolados e do gene omp7 em um dos isolados estudados. A ausência de transcrito para os genes opag3 e omp7 diverge do observado em isolados americanos da riquétsia. Possíveis razões para essas diferenças são discutidas.

Assessment of primers designed from the small ribosomal subunit rna for specific discrimination between babesia bigemina and babesia bovis by pcr

Six pairs of species-specific primers were designed from the alignment of the sequences of the SS rRNA gene obtained from the Genbank database for Babesia bigemina (accession number X59604) and for B. bovis (accession number U06105). Three pairs of primers were designed specifically for B. bigemina and another 3 sets of primers for B. bovis. All oligonucleotide sequences selected as primers were examined for similarities to other organisms through the Genbank Blast procedure and these 6 sets of primers demonstrated high level of specificity. The synthetic oligonucleotides were also tested for specificity by PCR assay using genomic DNA extracted from 40 isolates of B. bigemina and 30 from B. bovis, obtained in six different States of Brazil. All 6 sets of primers were validated as 100% specific for the respective parasite. The PCR amplified the expected fragments for each set of primers, as follows: a) B. bigemina: primers GAU5 forward/GAU6 reverse with amplicon of 1,124 bp; primers GAU5 forward/GAU8 reverse with amplicon of 458 bp; primers GAU7 forward/GAU6 reverse with amplicon of 685 bp; b) B. bovis: primers GAU9 forward/GAU10 reverse with amplicon of 541 bp; primers GAU9 forward/GAU 13 reverse with amplicon of 883 bp; primers SOGIN forward/GAU 10 with amplicon of 1211 bp. KEYWORDS: Babesia bovis, Babesia bigemina, SS rRNA gene, PCR, primers, bovine babesiosis.

ASSESSMENT OF PRIMERS DESIGNED FROM THE SMALL RIBOSOMAL SUBUNIT RNA FOR SPECIFIC DISCRIMINATION BETWEEN BABESIA BIGEMINA AND BABESIA BOVIS BY PCR

Six pairs of species-specific primers were designed from the alignment of the sequences of the SS rRNA gene obtained from the Genbank database for Babesia bigemina (accession number X59604) and for B. bovis (accession number U06105). Three pairs of primers were designed specifically for B. bigemina and another 3 sets of primers for B. bovis. All oligonucleotide sequences selected as primers were examined for similarities to other organisms through the Genbank Blast procedure and these 6 sets of primers demonstrated high level of specificity. The synthetic oligonucleotides were also tested for specificity by PCR assay using genomic DNA extracted from 40 isolates of B. bigemina and 30 from B. bovis, obtained in six different States of Brazil. All 6 sets of primers were validated as 100% specific for the respective parasite. The PCR amplified the expected fragments for each set of primers, as follows: a) B. bigemina: primers GAU5 forward/GAU6 reverse with amplicon of 1,124 bp; primers GAU5 forward/GAU8 reverse with amplicon of 458 bp; primers GAU7 forward/GAU6 reverse with amplicon of 685 bp; b) B. bovis: primers GAU9 forward/GAU10 reverse with amplicon of 541 bp; primers GAU9 forward/GAU 13 reverse with amplicon of 883 bp; primers SOGIN forward/GAU 10 with amplicon of 1211 bp. KEYWORDS: Babesia bovis, Babesia bigemina, SS rRNA gene, PCR, primers, bovine babesiosis.