Abstract:
:Detection of Ehrlichia chaffeensis is necessary to study interactions between the parasite and its vertebrate and invertebrate hosts. The purpose of this study was to develop a sensitive, specific PCR assay for E. chaffeensis based on the outer membrane protein gene, p28. Candidate primer sets were identified and ranked based on annealing scores, similarities to three major p28 sequence clusters, dissimilarity to E. canis p30, an ortholog of p28, and the proximities of flanking primer sequences for nested PCR. The relative sensitivities of five optimized single-step and two nested PCR assays were determined, and the most sensitive assay was found to be a single-step PCR that was as much as 1000-fold more sensitive than a standard 16S rDNA-based nested PCR assay. This p28-based PCR assay amplified the target amplicon from isolates representative of all three major clusters of known p28 sequences, and this assay did not amplify template prepared from either of the two species most closely related to E. chaffeensis, E. canis and E. muris. These results indicate that this sensitive, specific and isolate-universal single-step PCR assay will be a useful tool in characterizing the transmission of this important zoonotic pathogen.
journal_name
Mol Cell Probesjournal_title
Molecular and cellular probesauthors
Wagner ER,Bremer WG,Rikihisa Y,Ewing SA,Needham GR,Unver A,Wang X,Stich RWdoi
10.1016/j.mcp.2003.10.002subject
Has Abstractpub_date
2004-04-01 00:00:00pages
111-6issue
2eissn
0890-8508issn
1096-1194pii
S0890850803001099journal_volume
18pub_type
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