Physiochemical analyses and molecular characterization of heavy metal-resistant bacteria from Ilesha gold mining sites in Nigeria.

Autor: Ojo GJ; Department of Biological Sciences, Biotechnology Programme, Elizade University, P.M.B, 002 Ilara-Mokin, Ilara-Mokin, 340271, Nigeria. glory.ojo@elizadeuniversity.edu.ng., Onile OS; Department of Biological Sciences, Biotechnology Programme, Elizade University, P.M.B, 002 Ilara-Mokin, Ilara-Mokin, 340271, Nigeria., Momoh AO; Department of Biological Sciences, Microbiology Programme, Elizade University, Ilara Mokin, P.M.B, 002, Ilara-Mokin, 340271, Nigeria., Oyeyemi BF; Department of Science Laboratory Technology, Molecular Biology Group, The Federal Polytechnic, Ado-Ekiti, Ekiti, Nigeria., Omoboyede V; Department of Biochemistry, School of Life Sciences (SLS), Federal University of Technology Akure, P.M.B 704, Akure, Nigeria., Fadahunsi AI; Department of Biological Sciences, Biotechnology Programme, Elizade University, P.M.B, 002 Ilara-Mokin, Ilara-Mokin, 340271, Nigeria., Onile T; Department of Biological Sciences, Microbiology Programme, Elizade University, Ilara Mokin, P.M.B, 002, Ilara-Mokin, 340271, Nigeria.
Jazyk: angličtina
Zdroj: Journal, genetic engineering & biotechnology [J Genet Eng Biotechnol] 2023 Dec 22; Vol. 21 (1), pp. 172. Date of Electronic Publication: 2023 Dec 22.
DOI: 10.1186/s43141-023-00607-5
Abstrakt: Background: The contribution of the processes involved and waste generated during gold mining to the increment of heavy metals concentration in the environment has been well established. While certain heavy metals are required for the normal functioning of an organism, certain heavy metals have been identified for their deleterious effects on the ecosystem and non-physiological roles in organisms. Hence, efforts aimed at reducing their concentration level are crucial. To this end, soil and water samples were collected from Ilesha gold mining, Osun State, Nigeria, and they were subjected to various analyses aimed at evaluating their various physicochemical parameters, heavy metal concentration, heavy metal-resistant bacteria isolation, and other analyses which culminated in the molecular characterization of heavy metal-resistant bacteria.
Results: Notably, the results obtained from this study revealed that the concentration of heavy metal in the water samples around the mining site was in the order Co > Zn > Cd > Pb > Hg while that of the soil samples was in the order Co > Cd > Pb > Hg > Zn. A minimum inhibitory concentration test performed on the bacteria isolates from the samples revealed some of the isolates could resist as high as 800 ppm of Co, Cd, and Zn, 400 ppm, and 100 ppm of Pb and Hg respectively. Molecular characterization of the isolates revealed them as Priestia aryabhattai and Enterobacter cloacae.
Conclusion: Further analysis revealed the presence of heavy metal-resistant genes (HMRGs) including merA, cnrA, and pocC in the isolated Enterobacter cloacae. Ultimately, the bacteria identified in this study are good candidates for bioremediation and merit further investigation in efforts to bioremediate heavy metals in gold mining sites.
(© 2023. The Author(s).)
Databáze: MEDLINE
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