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PMID: 15231807 Published · ppublish English Comparative Study Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Research Support, U.S. Gov't, P.H.S. Validation Study

Construction and validation of the Rhodobacter sphaeroides 2.4.1 DNA microarray: transcriptome flexibility at diverse growth modes.

Journal of bacteriology ·Vol. 186 ·No. 14 ·2004-07-00 ·Pages 4748-58

Pappas CT, Sram J, Moskvin OV, Ivanov PS, Mackenzie RC, Choudhary M, Land ML, Larimer FW, Kaplan S, Gomelsky M

Abstract

A high-density oligonucleotide DNA microarray, a genechip, representing the 4.6-Mb genome of the facultative phototrophic proteobacterium, Rhodobacter sphaeroides 2.4.1, was custom-designed and manufactured by Affymetrix, Santa Clara, Calif. The genechip contains probe sets for 4,292 open reading frames (ORFs), 47 rRNA and tRNA genes, and 394 intergenic regions. The probe set sequences were derived from the genome annotation generated by Oak Ridge National Laboratory after extensive revision, which was based primarily upon codon usage characteristic of this GC-rich bacterium. As a result of the revision, numerous missing ORFs were uncovered, nonexistent ORFs were deleted, and misidentified start codons were corrected. To evaluate R. sphaeroides transcriptome flexibility, expression profiles for three diverse growth modes--aerobic respiration, anaerobic respiration in the dark, and anaerobic photosynthesis--were generated. Expression levels of one-fifth to one-third of the R. sphaeroides ORFs were significantly different in cells under any two growth modes. Pathways involved in energy generation and redox balance maintenance under three growth modes were reconstructed. Expression patterns of genes involved in these pathways mirrored known functional changes, suggesting that massive changes in gene expression are the major means used by R. sphaeroides in adaptation to diverse conditions. Differential expression was observed for genes encoding putative new participants in these pathways (additional photosystem genes, duplicate NADH dehydrogenase, ATP synthases), whose functionality has yet to be investigated. The DNA microarray data correlated well with data derived from quantitative reverse transcription-PCR, as well as with data from the literature, thus validating the R. sphaeroides genechip as a powerful and reliable tool for studying unprecedented metabolic versatility of this bacterium.

MeSH Terms
Adaptation, Physiological Aerobiosis Anaerobiosis DNA, Intergenic Energy Metabolism/genetics Gene Expression Profiling Genes, Bacterial Genes, rRNA Oligonucleotide Array Sequence Analysis Oxidation-Reduction Photosynthesis Polymerase Chain Reaction/methods RNA, Bacterial/analysis RNA, Messenger/analysis RNA, Transfer/analysis Reproducibility of Results Rhodobacter sphaeroides/genetics,growth & development,metabolism Transcription, Genetic
Chemicals
DNA, Intergenic RNA, Bacterial RNA, Messenger RNA, Transfer
Authors & Affiliations
10 authors, click to expand affiliations / ORCID
Pappas Christopher T
Department of Molecular Biology, University of Wyoming, 1000 E. University Ave., Dept. 3944, Laramie, WY 82071, USA.
Sram Jakub
Moskvin Oleg V
Ivanov Pavel S
Mackenzie R Christopher
Choudhary Madhusudan
Land Miriam L
Larimer Frank W
Kaplan Samuel
Gomelsky Mark
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Article Info
Journal
Journal of bacteriology
Abbr.
J Bacteriol
ISSN
0021-9193
Published
2004-07-00
Pages
4748-58
Language
English
Region
United States
NLM ID
2985120R
PMCID
PMC438620
Subset
IM
Grants
NCRR NIH HHS · P20 RR015640 · United States
NIGMS NIH HHS · R01 GM015590 · United States
NIGMS NIH HHS · GM15590 · United States
NCRR NIH HHS · P20 RR15640 · United States
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