Here we present the first oligonucleotide DNA microarray analysis of global gene expression changes in the obligate intracytoplasmic pathogen Rickettsia prowazekii using temperature upshift as a model stress condition, and we describe a methodology for isolating highly purified rickettsial RNA. In toto, 23 transcripts were significantly increased by temperature upshift (> or = 2.0-fold; P < 0.05), and no transcripts demonstrated reproducible decreases. Array results for three heat shock-inducible mRNAs were confirmed using quantitative reverse transcription-PCR.
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