Actinobacillus actinomycetemcomitans serotype e - biotypes, genetic diversity and distribution in relation to periodontal status

DOĞAN B., Saarela M., Jousimies-Somer H., Alaluusua S., Asikainen S.

ORAL MICROBIOLOGY AND IMMUNOLOGY, vol.14, no.2, pp.98-103, 1999 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 14 Issue: 2
  • Publication Date: 1999
  • Doi Number: 10.1034/j.1399-302x.1999.140204.x
  • Page Numbers: pp.98-103


Actinobacillus actinomycetemcomitans isolates from 356 individuals were screened for identification of serotype e in order to investigate its distribution in relation to periodontal status. From subjects with serotype e, 1-6 isolates per subject (n= 61) were genotyped using arbitrarily primed-polymerase chain reaction (AP-PCR) and apaH gene polymerase chain reaction-restriction fragment-length polymorphism (PCR-RFLP) analysis to determine the genetic heterogeneity within the serotype. Furthermore, one serotype e strain per subject was tested for fermentation of 8 carbohydrates for biotyping. Among patients with adult periodontitis (n=219), localized juvenile periodontitis (n=55) and other forms of early-onset periodontitis (n=18) serotypes b, a and c, respectively, were the most frequently detected serotypes. Non-periodontitis subjects (n=64) were predominantly colonized with serotype c. Serotype e was found in 30 (14%) adult periodontitis patients, 2(11%)early-onset periodontitis patients and in 5 (8%) non-periodontitis individuals, but in none of the 55 localized juvenile periodontitis patients. AP-PCR distinguished 3 and apaH gene PCR-RFLP analysis 2 genotypes among the 61 A. actinomycetemcomitans serotype e isolates, one genotype per subject. The AP-PCR genotypes and 3 represented the apaH genotype and the AP-PCR genotype 2 the apaH genotype 2. On the basis of variable fermentation of galactose and xylose, 3 biotypes among A. actinomycetemcomitans serotype e were established. Contrary to the absence of A. actinomycetemcomitans serotype e in localized juvenile periodontitis patients, its detection frequency was comparable among other forms of periodontitis and periodontal health. Clinical serotype e isolates form at least ? genetic types and 3 biotypes.