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Journal of Clinical Microbiology, February 1998, p. 345-351, Vol. 36, No. 2
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Serotyping and Genotyping of Genital Chlamydia trachomatis Isolates Reveal Variants of Serovars Ba, G, and J as Confirmed by omp1 Nucleotide Sequence Analysis

Servaas A. Morré,1 Jacobus M. Ossewaarde,2 Jar Lan,1 Gerard J. J. van Doornum,3 Jan M. M. Walboomers,1 David M. MacLaren,4 Chris J. L. M. Meijer,1 and Adriaan J. C. van den Brule1,4,*

Section of Molecular Pathology, Department of Pathology,1 and Department of Clinical Microbiology, University Hospital "Vrije Universiteit,"4 and Municipal Health Service,3 Amsterdam, and Laboratory of Virology, National Institute of Public Health and the Environment, Bilthoven,2 The Netherlands

Received 26 March 1997/Returned for modification 10 June 1997/Accepted 4 November 1997

Urogenital isolates (n = 93) of Chlamydia trachomatis were differentiated into serovars and variants by serotyping with monoclonal antibodies and genotyping by restriction fragment length polymorphism (RFLP) analysis of the PCR-amplified omp1 gene, respectively. The types of 87 of the 93 isolates (94%) were identical, as determined by both methods. Among these 87 isolates, 3 isolates were identified as the recently described new serovariant Ga/IOL-238 by omp1 nucleotide sequence analysis of the variable domains. Of the remaining six isolates, three isolates serotyped as both L2 and Ba but were identified as Ba/A-7 by genotyping by RFLP analysis of omp1. The omp1 nucleotide sequences of variable domains VD1, VD2, and VD4 of these urogenital Ba strains were identical to the sequences of the variable domains of Ba/J160, an ocular Ba type. The three remaining isolates were serotyped as J, but the patterns obtained by RFLP analysis of omp1, which were identical for the three isolates, differed from that of prototype serovar J/UW36. omp1 nucleotide sequence analysis revealed that these strains are genovariants of serovar J/UW36. Nucleotide sequence differences between serovar J/UW36 and this J genovariant, designated Jv, were found in both variable and constant domains. In conclusion, this study shows that the PCR-based genotyping of clinical C. trachomatis isolates by RFLP analysis of omp1 has a higher discriminatory power and is more convenient than serotyping. Variants of C. trachomatis serovars Ba, G, and J were identified and characterized.

* Corresponding author. Mailing address: Section of Molecular Pathology, Department of Pathology, University Hospital Vrije Universiteit, De Boelelaan 1117, 1081 HV, Amsterdam, The Netherlands. Phone: 31-20-4440503 and 31-20-4444023. Fax: 31-20-4442964. E-mail: vandenbrule{at}azvu.nl.

Journal of Clinical Microbiology, February 1998, p. 345-351, Vol. 36, No. 2
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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