Consistent Intrafamilial Transmission of Actinobacillus actinomycetemcomitans Despite Clonal Diversity
Corresponding Author
Başak Doğan
Department of Basic Health Sciences, Faculty of Health Sciences, Marmara University, Istanbul, Turkey.
Correspondence: Dr. Başak Doğan, Department of Basic Health Sciences, Faculty of Health Sciences, University of Marmara, 81420 Cevizli-Kartal, Istanbul, Turkey. Fax: 90-216-4561907; e-mail: [email protected].Search for more papers by this authorArzu Şahan Kipalev
Department of Periodontology, Faculty of Dentistry, Gazi University, Ankara, Turkey.
Search for more papers by this authorEmel Ökte
Department of Periodontology, Faculty of Dentistry, Gazi University, Ankara, Turkey.
Search for more papers by this authorNedim Sultan
Department of Microbiology, Faculty of Medicine, Gazi University.
Search for more papers by this authorSirkka E. Asikainen
Section of Oral Microbiology, Institute of Odontology, Umeå University, Umeå, Sweden.
Search for more papers by this authorCorresponding Author
Başak Doğan
Department of Basic Health Sciences, Faculty of Health Sciences, Marmara University, Istanbul, Turkey.
Correspondence: Dr. Başak Doğan, Department of Basic Health Sciences, Faculty of Health Sciences, University of Marmara, 81420 Cevizli-Kartal, Istanbul, Turkey. Fax: 90-216-4561907; e-mail: [email protected].Search for more papers by this authorArzu Şahan Kipalev
Department of Periodontology, Faculty of Dentistry, Gazi University, Ankara, Turkey.
Search for more papers by this authorEmel Ökte
Department of Periodontology, Faculty of Dentistry, Gazi University, Ankara, Turkey.
Search for more papers by this authorNedim Sultan
Department of Microbiology, Faculty of Medicine, Gazi University.
Search for more papers by this authorSirkka E. Asikainen
Section of Oral Microbiology, Institute of Odontology, Umeå University, Umeå, Sweden.
Search for more papers by this authorAbstract
Background: Actinobacillus actinomycetemcomitans is a major pathogen in aggressive periodontitis. Our objectives were to determine the periodontal status and occurrence of A. actinomycetemcomitans in family members of subjects with A. actinomycetemcomitans–positive aggressive periodontitis (AgP) and to evaluate the probability of its intrafamilial transmission.
Methods: Of the 300 subjects screened, 66 (22%) had AgP and A. actinomycetemcomitans. Eleven (probands) of these 66 subjects with AgP met the strict inclusion criteria for the study. The study population consisted of 55 subjects, including probands and their family members (N = 44). Two family groups were formed according to whether the proband was a child (N = 7) or a parent (N = 4). Subgingival samples from all subjects were cultured for A. actinomycetemcomitans, and its clonal types were determined by combining serotype and genotype data for each isolate.
Results: Among 42 dentate family members, 16 (38%) exhibited periodontitis and eight (50%) had AgP. Periodontitis was found in nine of 12 (75%) of the dentate parents and six of 17 (35%) siblings of the child probands. A. actinomycetemcomitans was detected in 16 of 31 (52%) family members, i.e., one parent and at least one sibling in six families. The child probands shared A. actinomycetemcomitans clonal types with their parents in five of six (83%) families and with their siblings in three of six (50%) families. In the four parent–proband families, A. actinomycetemcomitans occurred in two spouses and all nine children. The parent probands shared A. actinomycetemcomitans clonal types with their spouses in both families and with their children in three of four families. In all families, the likelihood of intrafamilial transmission of A. actinomycetemcomitans was statistically significant. Members of most families (eight of 11, 73%) also harbored additional clonal types of A. actinomycetemcomitans.
Conclusion: Parents and siblings of an individual with A. actinomycetemcomitans–positive AgP may have an increased susceptibility to periodontitis and shared and/or other clonal types of oral A. actinomycetemcomitans.
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