Application of an oligonucleotide array assay for rapid detecting and genotyping of Chlamydia trachomatis from urogenital specimens.
An oligonucleotide array technology was established for rapidly detecting and genotyping Chlamydia trachomatis in urogenital infections. The VS1-VS2 region of the omp1 gene was used to design oligonucleotide probes. Eleven serovar-specific probes to serovars A, B, C, D, E, F, G, H, I, J, and K, and 3 group-specific probes to group B (B, Ba, D, E, L1, and L2), group C (A, C, H, I, J, K, and L3), and an intermediate group (F and G) were synthesized and spotted onto the nylon membrane. Two pairs of universal primers were designed for the nested polymerase chain reaction (PCR) amplification of the VS1-VS2 gene. Digoxigenin-labeled amplicons of the VS1-VS2 gene of C. trachomatis were hybridized to the membrane array. Hybridization signals were read by the nitroblue tetrazolium/5-bromo-4-chloro-3-indolylphosphate color development. The assay developed was tested with reference strains of C. trachomatis serovars and clinical samples. The sensitivity was evaluated for 57 samples previously found to be positive for C. trachomatis by using plasmid PCR, and 98.2% (56/57) concordance was obtained. Fourteen oligonucleotide probes were optimized by trying different reaction conditions, showing specific hybridization with the corresponding reference strains, but no cross-reactions with other urogenital microorganisms. Using this procedure, a total of 59 strains were detected from 56 chlamydial samples. Eight genotypes were found, and type D, E, F, and H were the most frequently observed types (77.9%). Three cases (5.4%) had multiple infections with serovars: 1.D/E, 2.D/F, and 3.F/K. To validate the reference strains and confirm the genotype identity as determined by the oligonucleotide array technology, we sequenced all reference strains and 10 selected specimens across variable sequence VS1 and VS2. No discrepancies were found between the array typing and the genotype identity confirmed by nucleotide sequencing of the PCR product. The findings from this study indicated that the oligonucleotide array is a simple, fast, and specific assay for directly detecting and genotyping C. trachomatis from clinical samples.
Zheng
He-ping
HP
Department of Microbiology, School of Medicine, Sun Yat-sen University, Guangzhou 510089, China.
Jiang
Li-fang
LF
Fang
Dan-yun
DY
Xue
Yao-hua
YH
Wu
Ya-an
YA
Huang
Jin-mei
JM
Ou
Zhi-ying
ZY
D015373:Bacterial Typing Techniques; D002690:Chlamydia Infections / Q000382:microbiology; D002692:Chlamydia trachomatis / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification; D005260:Female; D052776:Female Urogenital Diseases / Q000382:microbiology*; D005838:Genotype; D006801:Humans; D008297:Male; D052801:Male Urogenital Diseases / Q000382:microbiology*; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods*; D015345:Oligonucleotide Probes; D018272:Porins / Q000235:genetics; D012680:Sensitivity and Specificity; D013997:Time Factors
D015345:Oligonucleotide Probes; D018272:Porins; C071677:omp1 protein, Chlamydia trachomatis