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Twenty one Chlamydia trachomatis reference strains and 40 clinical isolates belonging to the lymphogranuloma venerum (LGV) and trachoma biovars were genotyped by differential restriction mapping of the major-outer-membrane-protein gene (MOMP) obtained by the polymerase-chain reaction (PCR). AluI digestion of the PCR product distinguishes eight MOMP-genotypes corresponding to 8 serovars. Six additional enzymes (NlaIII, CfoI, EcoRI, HinfI, DdeI and FokI) further permit the discrimination of 10 MOMP-genotypes corresponding to the 10 remaining serovars of the species. AluI alone allows direct typing of 78% of the clinical isolates. AluI digestion patterns of mouse C. trachomatis biovar, a C. pneumoniae and two C. psittaci strains, studied for comparison, were clearly distinguishable from one another and from the C. trachomatis LGV and trachoma strains. These results indicate that MOMP genotyping by PCR is a valuable molecular tool for studying C. trachomatis epidemiology.

Rapid genotyping of the Chlamydia trachomatis major outer membrane protein by the polymerase chain reaction