DNA sequencing validation of Chlamydia trachomatis and Neisseria gonorrhoeae nucleic acid tests.
DNA sequencing was used to confirm Chlamydia trachomatis and Neisseria gonorrhoeae nucleic acids in endocervical swab samples. DNA in residues of the samples with positive results by 2 commercial kits was subjected to nested polymerase chain reaction (PCR) amplification. The nested PCR amplicons were used as templates for direct automated DNA sequencing. A 40-base signature sequence was sufficient to achieve unequivocal validation of C trachomatis cryptic plasmid and gonococcal opa gene DNA. DNA with a signature sequence specific for C trachomatis was identified in all 14 samples and for N gonorrhoeae in all 13 samples with positive results by the commercial kits for these 2 microbes. In a low-prevalence population, PCR retesting of 289 samples with initial negative results by a non-nucleic acid amplification assay revealed 3 samples positive for C trachomatis and 2 samples positive for N gonorrhoeae that were missed by the commercial kit. DNA sequencing is a useful tool in validating molecular diagnostics.
Lee
Sin Hang
SH
Department of Pathology, Milford Hospital, Milford, CT.
Vigliotti
Veronica S
VS
Pappu
Suri
S
D001483:Base Sequence; D002690:Chlamydia Infections / Q000175:diagnosis* / Q000382:microbiology; D002692:Chlamydia trachomatis / Q000235:genetics* / Q000302:isolation & purification; D004269:DNA, Bacterial / Q000032:analysis*; D005188:False Negative Reactions; D006069:Gonorrhea / Q000175:diagnosis* / Q000382:microbiology; D006801:Humans; D025202:Molecular Diagnostic Techniques; D008969:Molecular Sequence Data; D009344:Neisseria gonorrhoeae / Q000235:genetics* / Q000302:isolation & purification; D021141:Nucleic Acid Amplification Techniques; D011237:Predictive Value of Tests; D011933:Reagent Kits, Diagnostic; D017422:Sequence Analysis, DNA
D004269:DNA, Bacterial; D011933:Reagent Kits, Diagnostic