In simplex PCR assay, allele specific rstR primers, rstREl Tor and
rstRClassical were used for detection of allelic types of rstR in clinical
isolates of V. cholerae as described previously (Bhattacharya
et al., 2006). The ctxB gene was amplified from the isolated strains
using ctx-F and ctx-R (Table 1). The PCR products were purified
and both strands were sequenced using Big-Dye terminator kit
on an automated nucleotide sequencer (Model 3730xl; Applied
Biosystems). The sequences of the ctxB gene for other V. cholerae
O1 El Tor and classical strains were retrieved from GenBank. The
deduced amino acid sequences of the ctxB gene from all strains
were aligned using Clustal W. Simultaneously, all the isolates were
subjected to mismatch amplification mutation assay (MAMA) PCR
for detection of biotype specific ctxB allele as described elsewhere
(Morita et al., 2008). A common forward primer FW-Con (5-
ACTATCTTCAGCATATGCACATGG-3) was used for both alleles; and
2 allele-specific primers, Re-cla (5-CCTGGTACTTCTACTTGAAACG-
3) and Re-elt (5-CCTGGTACTTCTACTTGAAACA-3), were used for
classical and El Tor biotypes, respectively as described earlier
(Morita et al., 2008).
In simplex PCR assay, allele specific rstR primers, rstREl Tor andrstRClassical were used for detection of allelic types of rstR in clinicalisolates of V. cholerae as described previously (Bhattacharyaet al., 2006). The ctxB gene was amplified from the isolated strainsusing ctx-F and ctx-R (Table 1). The PCR products were purifiedand both strands were sequenced using Big-Dye terminator kiton an automated nucleotide sequencer (Model 3730xl; AppliedBiosystems). The sequences of the ctxB gene for other V. choleraeO1 El Tor and classical strains were retrieved from GenBank. Thededuced amino acid sequences of the ctxB gene from all strainswere aligned using Clustal W. Simultaneously, all the isolates weresubjected to mismatch amplification mutation assay (MAMA) PCRfor detection of biotype specific ctxB allele as described elsewhere(Morita et al., 2008). A common forward primer FW-Con (5-ACTATCTTCAGCATATGCACATGG-3) was used for both alleles; and2 allele-specific primers, Re-cla (5-CCTGGTACTTCTACTTGAAACG-3) and Re-elt (5-CCTGGTACTTCTACTTGAAACA-3), were used forclassical and El Tor biotypes, respectively as described earlier(Morita et al., 2008).
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