title: Identification of Lactobacillus crispatus by polymerase chain reaction targeting S-layer protein gene.
abstract: OBJECTIVE
  This study aimed to develop a polymerase chain reaction (PCR) method to identify Lactobacillus crispatus.
  
  
  RESULTS
  A primer set (CbsA2F-CbsA2R) for amplifying conserved regions of S-layer genes was designed to identify Lact. crispatus and the specificity of this set was compared with that of another primer set (Cri 16SI-Cri 16SII) which has been reported as a species-specific primer set targeting the 16S rRNA gene. Among species in the Lact. acidophilus A1-A4 groups, when KOD polymerase was used for amplification, the primer set CbsA2F-CbsA2R gave PCR products with Lact. crispatus strains only. However, when Taq polymerase was used, this primer set gave products with one Lact. amylovorus strain as well as with Lact. crispatus strains. The primer set Cri 16SI-Cri 16SII gave PCR products with Lact. crispatus strains and two Lact. acidophilus strains, regardless of whether the polymerase used was KOD or Taq.
  
  
  CONCLUSIONS
  A PCR targeting the S-layer gene and amplified with KOD polymerase can identify Lact. crispatus accurately and rapidly.
  
  
  CONCLUSIONS
  To the authors' knowledge, this is the first paper to provide a PCR method for the specific identification of Lact. crispatus.
authors.affiliation: Department of Biochemistry and Biotechnology, Faculty of Agriculture and Life Science, Hirosaki University, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Horie
authors.forename: H S
authors.initials: HS
authors.lastname: Kajikawa
authors.forename: T
authors.initials: T
authors.lastname: Toba
mesh_terms: D001425:Bacterial Outer Membrane Proteins / Q000235:genetics; D001426:Bacterial Proteins / Q000235:genetics*; D017931:DNA Primers / Q000235:genetics; D004587:Electrophoresis, Agar Gel / Q000379:methods; D005798:Genes, Bacterial; D007778:Lactobacillus / Q000145:classification* / Q000235:genetics; D007779:Lactobacillus acidophilus / Q000235:genetics / Q000302:isolation & purification; D008562:Membrane Glycoproteins; D008565:Membrane Proteins / Q000235:genetics*; D016133:Polymerase Chain Reaction / Q000379:methods*; D012680:Sensitivity and Specificity; D013045:Species Specificity
chemical_list: D001425:Bacterial Outer Membrane Proteins; D001426:Bacterial Proteins; D017931:DNA Primers; D008562:Membrane Glycoproteins; D008565:Membrane Proteins; C055764:S-layer proteins