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Composition and functional profiles of microbial communities in two geochemically and mineralogically different caves

  • Environmental Biotechnology
  • Published:
Applied Microbiology and Biotechnology Aims and scope Submit manuscript

Abstract

Microbial communities in cave ecosystems have specific survival strategies, which is far from being well explicated. Here, we reported the genetic and functional diversity of bacteria and archaea in typical limestone (Kashmir Cave) and silicate-containing (Tiser Cave) caves. X-ray diffraction (XRD) and Fourier transform infrared spectroscopic (FTIR) analyses revealed the different geochemical and mineral compositions of the two caves. Amplicon barcode sequencing revealed the dominancy of Actinobacteria and Proteobacteria in Kashmir and Tiser Caves. Bacteroidetes and Firmicutes were the dominant phyla in Tiser Cave, and the abundance is relatively small in Kashmir Cave. Archaea was also abundant prokaryotes in Kashmir Cave, but it only accounted for 0.723% of the total prokaryote sequences in Tiser Cave. Functional analysis based on metagenomic sequencing data revealed that a large number of functional potential genes involved in nutrient metabolism and biosynthesis of bioactive compounds in Tiser and Kashmir Cave samples could significantly influence the biogeochemical cycle and secondary metabolite production in cave habitats. In addition, the two caves were also found to be rich in biosynthetic genes, encoding bioactive compounds, such as monobactam and prodigiosin, indicating that these caves could be potential habitats for the isolation of antibiotics. This study provides a comprehensive insight into the diversity of bacteria and archaea in cave ecosystems and helps to better understand the special survival strategies of microorganisms in cave ecosystems.

Key points

Geochemically distinct caves possess unique microbial community structure.

Cavernicoles could be important candidates for antibiotic production.

Cavernicoles are important for biogeochemical cycling.

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Data availability

16S rRNA gene sequencing data and metagenomic shotgun sequencing data are available in the NCBI Sequence Read Archive (SRA) (http://www.ncbi.nlm.nih.gov/sra) with the accession number of PRJNA741692 and PRJNA741999, respectively.

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Funding

Funding for this study was provided by the National Natural Science Foundation of China (32070113) and Guangdong Science and Technology Department (2019ST023, 2019A1515011139).

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SZ, FH, ZH, and HW designated the experiment; SZ, JX, MY, XY and HW conducted the experiment and analyzed data; SZ, WS, MR wrote the first draft; HZ and HW reviewed and revised the manuscript.

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Correspondence to Hui Wang.

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Sahib Zada, Jianmin Xie and Min Yang are contributed equally

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Zada, S., Xie, J., Yang, M. et al. Composition and functional profiles of microbial communities in two geochemically and mineralogically different caves. Appl Microbiol Biotechnol 105, 8921–8936 (2021). https://doi.org/10.1007/s00253-021-11658-4

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  • DOI: https://doi.org/10.1007/s00253-021-11658-4

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