Brazilian Journal of Microbiology Brazilian Journal of Microbiology
Braz J Microbiol 2018;49:248-57 - Vol. 49 Num.2 DOI: 10.1016/j.bjm.2017.08.005
Environmental Microbiology
Analysis of bacterial communities and characterization of antimicrobial strains from cave microbiota
Muhammad Yasir
King Abdulaziz University, King Fahd Medical Research Center, Special Infectious Agents Unit, Jeddah, Saudi Arabia
Received 12 October 2016, Accepted 15 August 2017
Abstract

In this study for the first-time microbial communities in the caves located in the mountain range of Hindu Kush were evaluated. The samples were analyzed using culture-independent (16S rRNA gene amplicon sequencing) and culture-dependent methods. The amplicon sequencing results revealed a broad taxonomic diversity, including 21 phyla and 20 candidate phyla. Proteobacteria were dominant in both caves, followed by Bacteroidetes, Actinobacteria, Firmicutes, Verrucomicrobia, Planctomycetes, and the archaeal phylum Euryarchaeota. Representative operational taxonomic units from Koat Maqbari Ghaar and Smasse-Rawo Ghaar were grouped into 235 and 445 different genera, respectively. Comparative analysis of the cultured bacterial isolates revealed distinct bacterial taxonomic profiles in the studied caves dominated by Proteobacteria in Koat Maqbari Ghaar and Firmicutes in Smasse-Rawo Ghaar. Majority of those isolates were associated with the genera Pseudomonas and Bacillus. Thirty strains among the identified isolates from both caves showed antimicrobial activity. Overall, the present study gave insight into the great bacterial taxonomic diversity and antimicrobial potential of the isolates from the previously uncharacterized caves located in the world's highest mountains range in the Indian sub-continent.

Keywords
Caves, 16S ribosomal RNA, Microbiota, Antimicrobial, Sediments
Braz J Microbiol 2018;49:248-57 - Vol. 49 Num.2 DOI: 10.1016/j.bjm.2017.08.005