High-performance immune diagnosis of tuberculosis: Use of phage display and synthetic peptide in an optimized experimental design.

Journal of immunological methods 2022 Apr

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Immunoassays are practical and cost-effective approaches suitable for large-scale tuberculosis (TB) screening. This study identified new peptide mimotopes of Mycobacterium tuberculosis and applied them in the serodiagnosis of TB. Thereby, linear (X15, X8CX8) and constrained (LX-4 and LX-8) phage display peptide libraries were screened with purified Immunoglobulin G antibodies from TB-positive patients, and eight mimotopes were selected. The mimotope peptides were screened using the SPOT-synthesis technique followed by immunoblotting. Peptides P.Mt.PD.4 and P.Mt.PD.7 demonstrated the highest binding affinity and were chemically synthesized and used as antigens for enzyme-linked immunosorbent assay (ELISA) assays. Experimental designs were used to optimize the assays and to assess each variable's influence. Peptide P.Mt.PD.7 was differentiated between positive and negative samples and achieved 100% sensitivity and specificity when tested on a 100-sera panel. Therefore, the selected peptide was applied to the ELISA assay as a screening method for diagnosing TB represents a potential tool for helping to combat the disease. Copyright © 2022 Elsevier B.V. All rights reserved.

Citation

Natália Notto Serena, Raphael Aparecido Boschero, Manuel Hospinal-Santiani, Violetta Dias Pacce, Jean Michel Dela Vedova Costa, Francisco Beraldi De Magalhães, Carlos Wiedmar, Silvana Maria Alban, Carlos Ricardo Soccol, Vanete Thomaz-Soccol. High-performance immune diagnosis of tuberculosis: Use of phage display and synthetic peptide in an optimized experimental design. Journal of immunological methods. 2022 Apr;503:113242