High-Resolution Melting Curve Analysis of the 16S Ribosomal Gene to Detect and Identify Pathogenic and Saprophytic Leptospira Species in Colombian Isolates

• Published in: The American journal of tropical medicine and hygiene 2017-05, Vol.96 (5), p.1031-1038
• Main Authors: Peláez Sánchez, Ronald G, Quintero, Juan Álvaro López, Pereira, Martha María, Agudelo-Flórez, Piedad
• Format: Article
• Language: English
• Subjects: Animals; Base Sequence; Cebus - microbiology; Colombia; DNA Primers - chemistry; DNA, Bacterial - genetics; Dogs; Humans; Leptospira - classification; Leptospira - genetics; Leptospira - isolation & purification; Leptospirosis - diagnosis; Leptospirosis - microbiology; Nucleic Acid Denaturation; Phylogeny; Polymerase Chain Reaction - methods; Polymorphism, Genetic; Rats; RNA, Ribosomal, 16S - genetics; Sequence Analysis, DNA
• ISSN: 0002-9637; 1476-1645
• DOI: 10.4269/ajtmh.16-0312

AbstractIt is important to identify the circulating agent to enhance the performance of serodiagnostic tests by incorporating specific antigens of native species, develop vaccines that take into account the species/serovars circulating in different regions, and optimize prevention and control strategies. The objectives of this study were to develop a polymerase chain reaction (PCR)-high-resolution melting (HRM) assay for differentiating between species of the genus and to verify its usefulness in identifying unknown samples to species level. A set of primers from the initial region of the 16S ribosomal gene was designed to detect and differentiate the 22 species of . Eleven reference strains were used as controls to establish the reference species and differential melting curves. Twenty-five Colombian isolates were studied to evaluate the usefulness of the PCR-HRM assay in identifying unknown samples to species level. This identification was confirmed by sequencing and phylogenetic analysis of the 16S ribosomal gene. Eleven species were successfully identified, except for / because the sequences were 100% identical. The 25 isolates from humans, animals, and environmental water sources were identified as (twelve), (nine), and / (four). The species verification was 100% concordant between PCR-HRM and phylogenetic analysis of the 16S ribosomal gene. The PCR-HRM assay designed in this study is a useful tool for identifying species from isolates.