Improved diagnostic value of PCR in the diagnosis of female genital tuberculosis leading to infertility
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1 Journal of Medical Microbiology (2005), 54, DOI /jmm Improved diagnostic value of PCR in the diagnosis of female genital tuberculosis leading to infertility N. Vijaya Bhanu, 1,3 Urvashi B. Singh, 1 Milan Chakraborty, 1 Naga Suresh, 1 Jyoti Arora, 1 Tanu Rana, 1 D. Takkar 2 and Pradeep Seth 1 Correspondence Urvashi B. Singh urvashi00@hotmail.com 1,2 Departments of Microbiology 1 and Gynaecology 2, All India Institute of Medical Sciences, New Delhi, India 3 Molecular Medicine Branch, NIDDK, National Institutes of Health, Bethesda, MD 20892, USA Received 30 October 2004 Accepted 23 June 2005 Histopathological and mycobacteriological examinations have limited utility in the diagnosis of genital tuberculosis. In this double-blind study, 61 samples, consisting of endometrial aspirates (EAs), endometrial biopsies (EBs) and fluid from the pouch of Douglas (POD), from 25 women suffering from infertility were investigated for the presence of the mpt64 gene of Mycobacterium tuberculosis by PCR and correlated with laparoscopic findings. PCR demonstrated M. tuberculosis DNA in 14 out of 25 patients (56. 0 %), compared to one smear with acid-fast bacilli (1. 6 %) and two culture-positive samples (3.2 %). The presence of M. tuberculosis DNA was observed in 53.3%of EBs, % of EAs and % of POD fluid samples. All patients with laparoscopy suggestive of tuberculosis, 60 % of those with a probable diagnosis and 33 % of those with incidental findings were positive by PCR. However, one EA sample from an infertile patient with normal laparoscopy was also positive. Multiple sampling from different sites and amplification of the mpt64 gene segment by PCR offered increased sensitivity in determining tuberculous aetiology in female infertility. INTRODUCTION Tuberculosis (TB) is an infectious disease that causes considerable morbidity and mortality. It is a major socioeconomic burden in India, afflicting 14 million people, mostly in the reproductive age group (15 45 years). It is involved in about 5 16 % of cases of infertility among Indian women (Krishna et al., 1979; Parikh et al., 1997; Roy et al., 1993), though the actual incidence may be under-reported due to asymptomatic presentation of genital tuberculosis (GTB) and paucity of investigations. Traditionally, the laboratory diagnosis of TB depends on demonstration of the causative organism, Mycobacterium tuberculosis, by acid-fast staining and/or growth of the organism on Lowenstein-Jensen (LJ) medium. Microscopic examination of acid-fast bacilli (AFB) requires the presence of at least organisms ml 1 in the sample, while culture is more sensitive, requiring as little as 100 organisms ml 1 (Bates, 1979). However, M. tuberculosis may take up to 8 weeks to grow in LJ medium. Besides technical drawbacks in Abbreviations: AFB, acid-fast bacilli; EA, endometrial aspirate; EB, endometrial biopsy; GTB, genital tuberculosis; POD, pouch of Douglas; TB, tuberculosis. demonstrating M. tuberculosis in the laboratory, a substantial number of TB lesions of the genital tract are bacteriologically mute. PCR is a rapid, sensitive and specific molecular biological method for detecting mycobacterial DNA in both pulmonary and extra-pulmonary samples from suspected TB patients. PCR assays targeting various gene segments, including a 65 kda protein-encoding gene (Brisson-Noel et al., 1991), the IS6110 element (Eisenach et al., 1990; Kolk et al., 1992) and the mpt64 gene (Manjunath et al., 1991; Seth et al., 1996; Dar et al., 1998), have abbreviated the turnaround time for definitive mycobacteriological detection in the laboratory to 1 2 days, besides being more sensitive than conventional methods. We report the usefulness of an amplification format based on the mpt64 gene in determining the tubercular aetiology of female infertility. Further, in a double-blinded fashion, we evaluated the diagnostic competence of PCR vis-à-vis laparoscopic findings, besides establishing the appropriateness of using multiple samples, namely endometrial biopsy (EB), endometrial aspirate (EA) and fluid from the pouch of Douglas (POD), in this assay system for an accurate diagnosis of GTB & 2005 SGM Printed in Great Britain 927
2 N. V. Bhanu and others METHODS Patients and samples. Twenty-five women, aged years, presenting to the Infertility Clinic, All India Institute of Medical Sciences (AIIMS), New Delhi, with chronic pelvic inflammatory disease of non-chlamydial aetiology during 1999 were enrolled for this study after informed consent. Sixty-one coded samples, consisting of 15 EBs, 21 EAs and 25 samples of fluid from the POD, were sent to the Tuberculosis Laboratory, Department of Microbiology, AIIMS, for investigation. Additionally, five EBs, seven EAs and 12 POD samples from patients with a diagnosis other than TB were collected and evaluated for the specificity of PCR in these gynaecological samples. Sample processing. Samples of EB collected in normal saline, and EAs and fluid from the POD transported in sterile vials were received in a blinded fashion in the laboratory. The samples were decontaminated in 2 % NaOH employing modified Hank s flocculation method (Shriniwas & Bhatia, 1973). About 200 ìl of the concentrated sediment was used each for microscopy by Ziehl Neelsen s (ZN) stain, growth on LJ medium at 37 8C and PCR. Growth was monitored for 8 weeks and the mycobacterial species identified in positive cultures (Kent & Kubica, 1985). DNA extraction. For extraction of DNA, the decontaminated sediment was incubated in a lysis buffer containing 20 mm Tris/HCl (ph 8. 3), 0. 5 % Tween 20 and 1 mg proteinase K ml 1 for 16 h at 56 8C. The DNA was purified in phenol and phenol/chloroform/isoamyl alcohol (25 : 24 : 1), followed by precipitation in 0.3 M sodium acetate and absolute ethanol overnight at 20 8C. PCR. A 240 bp region of the mpt64 gene of M. tuberculosis was amplified using primers MPT1 (59-TCCGCTGCCAGTCGTCTTCC-39; nt ) and MPT2 (59-GTCCTCGCGAGTCTAGGCCA-39; nt ). The PCR was carried out in 50 ìl volumes consisting of 10 mm Tris/ HCl (ph 8.3), 50 mm NaCl, 1.5 mm MgCl 2,0.01 % (w/v) gelatin, 200 ìm of each of the four deoxynucleotide triphosphates (Perkin-Elmer), 0. 4 ìm of each primer, U Taq DNA polymerase (Perkin-Elmer) and 10 ìl of extracted DNA. Using an Amplitron thermocycler (Barnstead/Thermolyne), amplification was carried out for 30 cycles, each consisting of denaturation at 94 8C for 2 min, annealing at 60 8C for 2 min and extension at 72 8C for 2 min. The sensitivity of detection of the mpt64 gene was determined by PCR using DNA from the avirulent reference strain of M. tuberculosis, H37Ra (ATCC 25177), in a 10-fold serial dilution range between 100 ng and 1 fg, as reported previously (Seth et al., 1996). Extracts of DNA from gynaecological samples known to be negative for M. tuberculosis were amplified in order to determine the specificity of the PCR assay. The sensitivity of the PCR assay was calculated as the percentage of the results that were positive amongst patients with disease (defined as belonging to groups A and B). The specificity was determined as the percentage of the results that were negative amongst patients who did not have disease (defined as belonging to groups C and D). Each PCR series had one positive control (100 pg H37Ra DNA) and several negative controls (sterile distilled water) interspersed with the samples to monitor cross-contamination. The amplified products were fractionated along with the molecular mass marker öx174 DNA digested with HaeIII (Promega) in 1.5 % agarose gel and electrophoresed in Tris/HCl/boric acid/edta buffer (89 mm Tris/HCl, ph 8.0, 89 mm boric acid, 2. 5 mm EDTA) for 1 h. DNA from PCR-negative samples was spiked with 100 pg of DNA from the H37Ra strain of M. tuberculosis and reamplified to check for amplification inhibitors giving false-negative results. Further, to confirm the absence of the M. tuberculosis genome, all negative amplicons were dot-blotted and hybridized to an oligonucleotide probe, MPT3 (59-CTTCAACCCGGGGGAGT-39; nt ), specific to the 240 bp amplified region of the mpt64 gene and endlabelled with 32 P-dCTP (Bhabha Atomic Research Centre) by the method described by Sambrook et al. (1989). For PCR, precautions against cross- and carryover-contamination were followed as previously reported (Seth et al., 1996). While running the PCR, technicians were blinded to the clinical impression of TB. Analysis of results. After the results of microscopy, culture and PCR were available, the clinical codes were disclosed by the collaborating gynaecologist and the clinical category of the patients revealed. The patients were classified according to the following laparoscopic findings (Rattan et al., 1993): group A, suggestive diagnosis of TB (presence of caseation, granuloma/tubercles and/or beaded/thickened tube); group B, probable diagnosis of TB (hydrosalpinx, peritubal and/or periovarian adhesions, tubo-ovarian mass but without frank tubercles/caseation); group C, incidental findings (pelvic pathology other than pelvic inflammatory disease including fibroid uterus, endometriosis, polycystic ovaries, etc.); group D, normal findings. The number of patients in each category and the nature of the samples used are given in Table 1. RESULTS AND DISCUSSION The present study assesses the role of PCR in the diagnosis of GTB, using EB, EA and POD samples, in comparison to laparoscopic findings. None of the biopsy specimens had histopathological indications of TB. One EB sample, from group A, revealed AFB on smear examination after ZN staining (1. 6 %). This sample as well as a smear-negative EA, also from group A, grew isolates of M. tuberculosis in culture (3. 2 %). Poor rates of detection, as low as 0. 4 % (Agarwal & Gupta, 1993) and % (Misra et al., 1996) for smear, and % positivity by culture (Manjunath et al., 1991; Roy et al., 1993; Srivastava et al., 1997), have been reported elsewhere. Sampling plays an important role in the accuracy of detection of GTB. Since the involvement of the genital tract in TB could be generalized or localized, and the technique of sample collection is blind, there is a possibility of missing the infected area. Similarly, though the peritoneum might appear to be normal in laparoscopy, there might be an outpouring of bacilli from the uterine cavity to the peritoneum through the cornua and fallopian tubes. While laparoscopy generally detects macroscopic changes such as peritubal adhesions, tubercles on the tubes and small tubo-ovarian masses that commonly are seen in chronic cases, GTB presents unique diagnostic challenges including subtle clinical manifestations that may be overlooked in laparoscopy during early stages of infection. The detection sensitivity of the PCR assay was evaluated and it was found that as little as 5 fg of M. tuberculosis DNA from H37Ra (corresponding to one organism) spiked in water and 25 fg (five organisms) spiked in EB, EA and POD could be detected. Although higher sensitivities, such as detection of as little as c.f.u. ml 1 of sample by PCR of IS6110, have been reported (Forbes & Hicks, 1993), others have found that only about 52 % of samples harbouring, 50 M. tuberculosis c.f.u. ml 1 yield positive amplification results (Clarridges et al., 1993). In this study, among 15 EBs, 21 EAs and 25 POD fluid samples from 25 women, eight (53. 3 %), 10 (47. 6 %) and 928 Journal of Medical Microbiology 54
3 PCR for diagnosis of female genital tuberculosis Table 1. PCR results of patients in various clinical groups PCR sensitivities (groups A and B): EB, 57.1 %; EA, 50 %; POD, 23.5 %; EB+EA, 76.9 %; EB+POD, 57.1 %; EA+POD, 62.5 %. PCR specificities (groups C and D): EA, 60 %; POD, 100 %; EA+POD, 60 %. Note that the sample size is small in each category. Data have been included where at least two or three samples were available. Positivity in any one test is taken as a positive result. Negatives are those which are negative in all tests performed. Patient* No. of samples Sample test result PCR positivity (%) EB EA POD Sample Patient Group A (n ¼ 3) A1 +, S, C + + A2 +,C A3 k + Group B (n ¼ 15) B B2 + + B3 + + B4 + + B5 + + B6 + B7 k B8 B9 B10 k + B11 k NA B12 NA + B13 NA + B14 NA B15 NA NA Group C (n ¼ 3) C1 C2 NA + C3 NA Group D (n ¼ 4) D1 NA + D2 NA D3 NA NA D4 NA NA Total 61 8/15 (53.3 %) 10/21 (47.6 %) 4/25 (16.0%) *Patient groups according to laparoscopic findings: A, suggestive; B, probable; C, incidental; D, normal. +, PCR positive;, PCR negative; C, culture positive; S, smear positive; NA, not available. Percentage of all the samples in each group that were PCR positive. Percentage of patients within each group with one or more PCR-positive sample. kinhibition revealed by spiking. Inhibition disclosed by hybridization. four (16 %) samples, respectively, were PCR positive. Our results are comparable with those from Ethiopia reporting 48 % PCR positivity in biopsies and curettage samples from 25 women with complaints of infertility (Abebe et al., 2004). Comparing PCR with laparoscopic findings, all patients (100 %) in group A, nine out of 15 (60 %) in group B and one out of three (33. 3 %) in group C were PCR positive. However, one out of four patients (25 %) in group D was also found to be PCR positive. It is probable that the PCR-positive patient in group D had early endometrial involvement and PCR detected the low number of tubercle bacilli and possibly early disease. In light of our earlier study demonstrating mpt64 PCR to be both sensitive and specific (Seth et al., 1996) as well as the fact that concurrent negative controls (sterile water) in this series were PCR negative, it seems unlikely that this result is a case of false-positivity. Furthermore, the high endemicity of TB in India raises the possibility of this patient harbouring a latent 929
4 N. V. Bhanu and others infection. Regarding pulmonary TB, positive PCR signals for the IS6110 insertion sequence as an indicator of M. tuberculosis DNA were found in about 30 % of Ethiopians and Mexicans with latent M. tuberculosis infections (Hernandez- Pando et al., 2000). Therefore, the PCR-positive patient in group D may be considered as asymptomatic, having early disease or latent bacteria. Further, to rule out the possibility of the PCR-positive sample in group D being false-positive, we checked the specificity of our PCR assay in a second series of samples consisting of five EB, seven EA and 12 POD samples collected from patients with normal laparoscopy and diagnoses other than TB, all of which were found to be PCR negative. In this study, among 14 patients with all three sample types available, two patients were PCR positive in the EB only, while another two patients were PCR positive in the EA only. In 10 patients where an EB was not available, the EA was positive in three patients and the POD in one (Table 1). The sensitivity of the PCR was reasonably good (76. 9 %) when both the EB and EA samples were considered. This study supporting the use of EB and EA samples therefore endorses the study by Halbrecht (1947) on the importance of multiple sampling in aiding the diagnosis of GTB. In the present series, in spite of the fairly optimal positivity in different clinical groups based on laparoscopy, the majority of samples (63.9 %) were negative for the mpt64 gene. Since multiple sampling from the same sites could not be performed, we excluded the possibility of amplification inhibition by spiking all PCR-negative samples with 100 pg H37Ra DNA and reamplifying the samples. Inhibition was indicated, by the presence of a 240 bp product on reamplification, in three EBs and one EA. In addition, 37 PCR products that were negative by gel electrophoresis were hybridized to 32 P-MPT3. Only one gel-negative amplification product (2. 7 %), from an EB, hybridized to the radiolabelled probe, indicating the presence of M. tuberculosis DNA. This could be explained by the superiority of hybridization vis-à-vis PCR, in terms of sensitivity. However, PCR and hybridization were concordant in % of the negative results. Besides, the requirement of radioactive label and the tedious procedure lasting for 2 3 days offsets the benefits obtained by inclusion of hybridization in routine laboratory use. Further, the patient with hybridization-positivity had an EA sample positive for M. tuberculosis by PCR, so the diagnosis in this patient was achievable without the hybridization results. Finally, PCR identified 14 patients (56 %) as harbouring M. tuberculosis DNA, including the two patients whose samples had grown M. tuberculosis on culture, affording a sevenfold increase in the sensitivity of detection compared to the former technique. Compared to smear, PCR was 14-fold more sensitive and may be a useful diagnostic adjunct for a relatively asymptomatic disease, which is one of the important causes of infertility among women. The fallopian tube is the organ most commonly involved, and the use of multiple samples collected from either end of the tube clearly shows promise in improving the diagnostic yield. Proper sampling, multiple sampling and repeat sampling from the patient will enhance the sensitivity of PCR as a diagnostic tool for GTB. REFERENCES Abebe, M., Lakew, M., Kidane, D., Lakew, Z., Kiros, K. & Harboe, M. (2004). Female genital tuberculosis in Ethiopia. Int J Gynaecol Obstet 84, Agarwal, J. & Gupta, J. K. (1993). Female genital tuberculosis a retrospective clinicopathological study of 501 cases. Indian J Pathol Microbiol 36, Bates, J. H. (1979). Diagnosis of tuberculosis. Chest 76 (Suppl 6), Brisson-Noel, A., Aznar, C., Chureau, C. & 7 other authors (1991). 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Detection of latent genital tuberculosis by culture of menstrual discharge. Lancet ii, 447. Hernandez-Pando, R., Jeyanathan, M., Mengistu, G., Aguilar, D., Orozco, H., Harboe, M., Rook, G. A. & Bjune, G. (2000). Persistence of DNA from Mycobacterium tuberculosis in superficially normal lung tissue during latent infection. Lancet 356, Kent, P. T. & Kubica, G. P. (1985). Public Health Mycobacteriology: a Guide for Level III Laboratory. Washington, DC: US Department of Health and Human Services. Kolk, A. H. J., Schuitema, A. R. J., Kuijper, S., van Leeuwen, J., Hermans, P. W. M., van Embden, J. D. A. & Hartskeerl, R. A. (1992). Detection of Mycobacterium tuberculosis in clinical samples by using polymerase chain reaction and a nonradioactive detection system. J Clin Microbiol 30, Krishna, U. R., Sheth, S. S. & Motashaw, N. D. (1979). Place of laparoscopy in pelvic inflammatory disease. 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5 PCR for diagnosis of female genital tuberculosis Roy, A., Mukherjee, S., Bhattacharya, S., Adhya, S. & Chakraborty, P. (1993). Tuberculous endometritis in hills of Darjeeling: a clinicopathological and bacteriological study. Indian J Pathol Microbiol 36, Sambrook, J., Fritsch, E. F. & Maniatis, T. (1989). Molecular Cloning: a Laboratory Manual, 2nd edn. Cold Spring Harbor, NY: Cold Spring Harbor Laboratory. Seth, P., Ahuja, G. K., Bhanu, N. V., Behari, M., Bhowmik, S., Broor, S., Dar, L. & Chakraborty, M. (1996). Evaluation of polymerase chain reaction for rapid diagnosis of clinically suspected tuberculous meningitis. Tuber Lung Dis 77, Shriniwas & Bhatia, V. N. (1973). A study of mycobacterial species isolated from patients with chronic respiratory disease. Am Rev Resp Dis 108, Srivastava, N., Manaktala, U. & Baveja, C. P. (1997). Role of ELISA (enzyme-linked immunosorbent assay) in genital tuberculosis. Int J Gynaecol Obstet 57, Torrea, G., Van de Perre, P., Ouedraogo, M. & 8 other authors (2005). PCR-based detection of the Mycobacterium tuberculosis complex in urine of HIV-infected and uninfected pulmonary and extrapulmonary tuberculosis patients in Burkina Faso. J Med Microbiol 54,
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