CRISPR genetic engineering for enhanced bioremediation potential of rhizobacteria
Keywords:
Bioremediation, CRISPR-enhanced rhizobacteria, Heavy metals, Environmental pollutionAbstract
CRISPR-based genetic engineering provides a revolutionary method for improving the bioremediation potential of rhizobacteria. Species such as Bacillus subtilis, Pseudomonas fluorescens, and Azospirillum brasilense exhibit inherent efficacy in pollution breakdown and the enhancement of plant development. Utilising CRISPR-Cas systems like Cas9, CRISPRi, and CRISPRa, these microorganisms can be modified to enhance stress resilience, enzymatic function, and pollutant specificity. The method encompasses a framework that includes strain selection, whole-genome sequencing, and bioinformatic analysis to uncover essential catabolic and resistance genes. Guide RNAs are engineered to target specific loci and are associated with Cas proteins for gene editing. The resultant structures are introduced into rhizobacterial hosts via electroporation or conjugation. The efficacy of transformation and genomic integration is confirmed using PCR, gel electrophoresis, and sequencing. Modified strains are subjected to phenotypic screening to evaluate pollutant breakdown capability, enzymatic efficiency, and alterations in metabolic flux. Laboratory assays are succeeded by greenhouse trials to assess phytoremediation synergy, root colonisation efficacy, and rhizosphere stability under simulated field conditions. Environmental and biosafety factors are crucial in the implementation of CRISPR-modified rhizobacteria. This encompasses measures to reduce off-target effects, biocontainment methods including kill-switch devices, and monitoring for horizontal gene transfer by metagenomic surveillance. Ethical and regulatory compliance is achieved by following biosafety guidelines and conducting environmental risk assessments to maintain ecological stability. In conclusion, CRISPR-modified rhizobacteria constitute a promising and precise approach for environmental remediation. Their capacities for pollutant breakdown, coupled with host plant compatibility, render them effective instruments in sustainable environmental biotechnology.
References
1. Ali SS, Al Tohamy R, Li F, Okasha KM, Mahmoud YAG, Mahmoud RH, Helmy OM, Zhang R. Environmental remediation through microbial interventions: recent advances and future challenges. Front Microbiol. 2021;12:655172.
2. Sharma B, Dangi AK, Shukla P, Varjani S. Bioremediation: a sustainable approach for pollution control. Environ Monit Assess. 2020;192(9):1-22.
3. Hashem A, Tabassum B, Fathi Abd Allah E, Al-Arjani ABF, Egamberdieva D. Rhizobacteria and their role in bioremediation of heavy metals. Ecotoxicol Environ Saf. 2021;213:112067.
4. Bhatt P, Singh R, Sharma P. CRISPR-Cas: a potential tool for sustainable bioremediation. J Environ Manage. 2021;284:112006.
5. Bharagava RN, Sharma B, Kumar A, Mishra S. Role of rhizobacteria in bioremediation of soil pollutants. Environ Chem Lett. 2020;18:889-907.
6. Kumar M, Sharma P, Singh R. Engineering plant-microbe interactions for enhanced bioremediation using CRISPR/Cas9. J Appl Microbiol. 2020;129(4):827-838.
7. Jiang W, Bikard D, Cox D, Zhang F, Marraffini LA. Applications of CRISPR technology in bioremediation. Trends Biotechnol. 2021;39(7):673-676.
8. Zhang C, Zhang H, Wang L, Xu T, Zhang J. The use of nanotechnology in enhancing plant productivity and its compatibility with arbuscular mycorrhizal fungi. J Nanobiotechnology. 2020;18(1):1-15.
9. Rashid MI, Mujtaba M, Mehmood M, Waqas M. CRISPR-Cas systems: versatile genome editing tools for bacteria in environmental biotechnology. Biotechnol Adv. 2021;49:107763.
10. Chaudhary DK, Varma A, Mishra S. CRISPR-Cas systems in environmental biotechnology: emerging applications and challenges. Environ Pollut. 2021;276:116724.
11. Sahu R, Das S, Patel N. CRISPR tools for microbial degradation of organic pollutants. Sci Total Environ. 2022;815:152798.
12. Das AP, Pandey R, Bhardwaj A, Ghosh A. Microbial engineering through CRISPR-Cas: new horizons in environmental biotechnology. Biocatal Agric Biotechnol. 2023;47:102559.
13. Patel P, Sharma R, Verma S. Potential of rhizospheric microbes in phytoremediation: genetic enhancement through CRISPR. Environ Nanotechnol Monit Manag. 2021;16:100506.
14. Ma J, Zhang W, Li Y, He J. Barriers to genetic engineering in soil microbiomes. Appl Microbiol Biotechnol. 2020;104:4027-4037.
15. Nayak AK, Panda S, Behera BC, Das D. Responsive genetic circuits in rhizobacteria for environmental bioremediation. Synth Syst Biotechnol. 2022;7(2):532-542.
16. Rana A, Yadav S, Verma A, Singh J. Enhancing phytoremediation via CRISPR-engineered rhizobacteria: a new paradigm. J Plant Interact. 2023;18(1):50-63.
17. Srivastava P, Choudhary DK, Sharma S, Singh J, Singh V. Microbial biosurfactants in remediation of heavy metals and hydrocarbons. Environ Chem Lett. 2021;19(3):2133-2150.
18. Sarkar A, Ghosh S, Chatterjee A, Chattopadhyay D. Biosafety of CRISPR-Cas edited microbes for environmental applications. Crit Rev Biotechnol. 2021;41(2):213-230.
19. Lee J, Park S, Kim H. CRISPRi and CRISPRa: emerging tools for microbial metabolic engineering and synthetic biology. ACS Synth Biol. 2021;10(1):5-15.
20. Gupta S, Tiwari S, Verma H, Prasad R. CRISPR-based gene regulation for bioremediation: a review on present and future perspectives. Mol Biotechnol. 2022;64(9):891-907.
21. Nwachukwu OI, Eze CI, Okeke CC. Environmental biotechnology in Africa: exploring the CRISPR frontier. Environ Manage. 2021;67:350-359.
22. Kumar S, Patel R, Mehta A. CRISPR and microbial remediation: genomic tools for future environmental clean ups. Environ Res. 2021;201:111565.
23. Fatima K, Shakoor S, Ahmed S, Ameen A. Harnessing CRISPR-based genome editing in bacteria for bioremediation: promises and perils. Environ Sci Pollut Res Int. 2023;30:45678-45695.
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