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Evaluation of immunodominant peptides of in vivo expressed mycobacterial antigens in an ELISA-based diagnostic assay for pulmonary tuberculosis

  • Clinical Microbiology - Research Paper
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Abstract

Non-sputum-based biomarker assay is urgently required as per WHO’s target product pipeline for diagnosis of tuberculosis. Therefore, the current study was designed to evaluate the utility of previously identified proteins, encoded by in vivo expressed mycobacterial transcripts in pulmonary tuberculosis, as diagnostic targets for a serodiagnostic assay. A total of 300 subjects were recruited including smear+, smear− pulmonary tuberculosis (PTB) patients, sarcoidosis patients, lung cancer patients and healthy controls. Proteins encoded by eight in vivo expressed transcripts selected from previous study including those encoded by two topmost expressed and six RD transcripts (Rv0986, Rv0971, Rv1965, Rv1971, Rv2351c, Rv2657c, Rv2674, Rv3121) were analyzed for B-cell epitopes by peptide arrays/bioinformatics. Enzyme-linked immunosorbent assay was used to evaluate the antibody response against the selected peptides in sera from PTB and controls. Overall 12 peptides were selected for serodiagnosis. All the peptides were initially screened for their antibody response. The peptide with highest sensitivity and specificity was further assessed for its serodiagnostic ability in all the study subjects. The mean absorbance values for antibody response to selected peptide were significantly higher (p<0.001) in PTB patients as compared to healthy controls; however, the sensitivity for diagnosis of PTB was 31% for smear+ and 20% for smear− PTB patients. Thus, the peptides encoded by in vivo expressed transcripts elicited a significant antibody response, but are not suitable candidates for serodiagnosis of PTB.

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Data availability

All the data generated during this study is included in the current research article and its supplementary information files.

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Acknowledgements

The help from Dr. Prabhdeep Kaur during the standardization of ELISA is highly acknowledged.

Funding

This work was supported by intramural research grant No.71/8-Edu-15/1610 provided to Dr. Indu Verma by PGIMER, NIH/FIC AITRP grant No. TW001409 provided to Dr. Suman Laal and Research grant 09/141(0180)2011-EMR-I provided to Dr. Sumedha Sharma as fellowship by Council of Scientific and Industrial Research, Human Resource Development Group.

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Authors and Affiliations

Authors

Contributions

Conceptualization: S.S., I.V.; methodology: S.S., I.V; data curation: S.S., D.S.; formal analysis: S.S., I.V., A.N.A.; resources: IV, ANA, SL, S.Sethi, R.Y.; writing—original draft: S.S.; writing—review and editing: S.S., I.V., funding: I.V., S.L., S.S.

Corresponding author

Correspondence to Indu Verma.

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Ethics approval

The Institutional Ethics Committee PGIMER provided approval for current study vide no. 8818/PG11-1TRG/168235.

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Informed consent was obtained from the study subjects.

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The authors declare no competing interests.

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Responsible Editor: Fernando R. Pavan

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Supplementary Information.

ESM 1:

HPLC Report of commercially synthesized peptides used in current study.

ESM 2:

Table S1: Representative table showing the raw data obtained for peptide arrays.

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Sharma, S., Suri, D., Aggarwal, A.N. et al. Evaluation of immunodominant peptides of in vivo expressed mycobacterial antigens in an ELISA-based diagnostic assay for pulmonary tuberculosis. Braz J Microbiol 54, 1751–1759 (2023). https://doi.org/10.1007/s42770-023-00998-0

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