Transcription profiles of the bacterium Mycoplasma pneumoniae grown at different temperatures

Nucleic Acids Res. 2003 Nov 1;31(21):6306-20. doi: 10.1093/nar/gkg841.


Applying microarray technology, we have investigated the transcriptome of the small bacterium Mycoplasma pneumoniae grown at three different temperature conditions: 32, 37 and 32 degrees C followed by a heat shock for 15 min at 43 degrees C, before isolating the RNA. From 688 proposed open-reading frames, 676 were investigated and 564 were found to be expressed (P < 0.001; 606 with P < 0.01) and at least 33 (P < 0.001; 77 at P < 0.01) regulated. By quantitative real-time PCR of selected mRNA species, the expression data could be linked to absolute molecule numbers. We found M.pneumoniae to be regulated at the transcriptional level. Forty-seven genes were found to be significantly up-regulated after heat shock (P < 0.01). Among those were the conserved heat shock genes like dnaK, lonA and clpB, but also several genes coding for ribosomal proteins and 10 genes of unassigned functions. In addition, 30 genes were found to be down-regulated under the applied heat shock conditions. Further more, we have compared different methods of cDNA synthesis (random hexamer versus gene-specific primers, different RNA concentrations) and various normalization strategies of the raw microarray data.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Conserved Sequence / genetics
  • Gene Expression Regulation, Bacterial*
  • Genes, Bacterial / genetics*
  • Heat-Shock Proteins / genetics
  • Heat-Shock Response / genetics
  • Internet
  • Mycoplasma pneumoniae / cytology
  • Mycoplasma pneumoniae / genetics*
  • Mycoplasma pneumoniae / growth & development*
  • Oligonucleotide Array Sequence Analysis
  • Open Reading Frames / genetics
  • RNA, Bacterial / analysis
  • RNA, Bacterial / genetics
  • RNA, Bacterial / metabolism*
  • Reproducibility of Results
  • Reverse Transcriptase Polymerase Chain Reaction
  • Temperature*
  • Transcription, Genetic*


  • Heat-Shock Proteins
  • RNA, Bacterial