title: Microarray-based whole-genome hybridization as a tool for determining procaryotic species relatedness.
abstract: The definition and delineation of microbial species are of great importance and challenge due to the extent of evolution and diversity. Whole-genome DNA-DNA hybridization is the cornerstone for defining procaryotic species relatedness, but obtaining pairwise DNA-DNA reassociation values for a comprehensive phylogenetic analysis of procaryotes is tedious and time consuming. A previously described microarray format containing whole-genomic DNA (the community genome array or CGA) was rigorously evaluated as a high-throughput alternative to the traditional DNA-DNA reassociation approach for delineating procaryotic species relationships. DNA similarities for multiple bacterial strains obtained with the CGA-based hybridization were comparable to those obtained with various traditional whole-genome hybridization methods (r=0.87, P<0.01). Significant linear relationships were also observed between the CGA-based genome similarities and those derived from small subunit (SSU) rRNA gene sequences (r=0.79, P<0.0001), gyrB sequences (r=0.95, P<0.0001) or REP- and BOX-PCR fingerprinting profiles (r=0.82, P<0.0001). The CGA hybridization-revealed species relationships in several representative genera, including Pseudomonas, Azoarcus and Shewanella, were largely congruent with previous classifications based on various conventional whole-genome DNA-DNA reassociation, SSU rRNA and/or gyrB analyses. These results suggest that CGA-based DNA-DNA hybridization could serve as a powerful, high-throughput format for determining species relatedness among microorganisms.
authors.affiliation: Department of Botany and Microbiology, Institute for Environmental Genomics, Stephenson Research and Technology Center, University of Oklahoma, Norman, OK 73019, USA.
authors.forename: Liyou
authors.initials: L
authors.lastname: Wu
authors.forename: Xueduan
authors.initials: X
authors.lastname: Liu
authors.forename: Matthew W
authors.initials: MW
authors.lastname: Fields
authors.forename: Dorothea K
authors.initials: DK
authors.lastname: Thompson
authors.forename: Christopher E
authors.initials: CE
authors.lastname: Bagwell
authors.forename: James M
authors.initials: JM
authors.lastname: Tiedje
authors.forename: Terry C
authors.initials: TC
authors.lastname: Hazen
authors.forename: Jizhong
authors.initials: J
authors.lastname: Zhou
mesh_terms: D001419:Bacteria / Q000145:classification* / Q000235:genetics; D001426:Bacterial Proteins / Q000235:genetics; D015373:Bacterial Typing Techniques / Q000379:methods*; D018983:DNA Footprinting; D027081:DNA Gyrase / Q000235:genetics; D004269:DNA, Bacterial / Q000032:analysis / Q000235:genetics; D004275:DNA, Ribosomal / Q000235:genetics; D016680:Genome, Bacterial; D009693:Nucleic Acid Hybridization / Q000379:methods*; D020411:Oligonucleotide Array Sequence Analysis; D010802:Phylogeny
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D027081:DNA Gyrase