Discrimination of Streptococcus pneumoniae from viridans group streptococci by genomic subtractive hybridization

Nao Suzuki, Mitsuko Seki, Yoshio Nakano, Yusuke Kiyoura, Masao Maeno, Yoshihisa Yamashita

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)


Two oligonucleotide primer sets for the discrimination of Streptococcus pneumoniae from "pnenmococcus-like" oral streptococcal isolates by PCR were developed. Genomic sobtractive hybridization was performed to search for differences between Streptococcus pneumoniae strain WU2 and the most closely related oral streptococcus, Streptococcus mitis strain 903. We identified 19 clones that contained 5. pneumoniae-specific nucleotide fragments that were absent from the chromosomal DNA of typical laboratory strains of S. mitis and other oral bacteria. Subsequently, oligonucleotide PCR primers for the detection of S. pneumoniae were designed from the sequences of the subtracted DNA fragments, and the specificities of the 19 primer sets were evaluated by PCR using chromosomal DNAs extracted from four S. pneumoniae clinical isolates and from 20 atypical organisms classified as S. mitis or S. oralis, which harbored genes encoding the peeumococcal virulence factors autolysin (lytA) or pneumolysin (ply), as templates. Of the 19 primer sets, two (Spn9802 and Spn9828) did not amplify PCR products from any of the pneumococcus-like streptococcal strains that we examined. The genes containing the Spn9802 and Spn9828 sequences encoded proteins of unknown function that did not correspond to any previously described proteins in other bacteria. These new oligonucleotide primers may be very useful for early and correct diagnosis of S. pneumoniae infections.

Original languageEnglish
Pages (from-to)4528-4534
Number of pages7
JournalJournal of Clinical Microbiology
Issue number9
Publication statusPublished - Sept 2005

All Science Journal Classification (ASJC) codes

  • Microbiology (medical)


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