Genomics and metagenomics in biological remediation
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Environmental pollutants are of serious ecotoxicological and health concern worldwide. To cope with these, bioremediation technologies utilizing microorganisms is currently viewed as an excellent cost-effective and ecofriendly strategy for the environmental management. However, a strategic execution of the bioremediation technology requires the knowledge of microbial metabolism, key enzymes, and genes involved and nature, dynamics, and composition of microbial communities, which can be easily understood by applying molecular techniques. Conventional or culture-dependent molecular techniques are currently being applied to characterize the potential pollutants degrading/detoxifying microbes, but these techniques are sometimes biased and do not actually provide the accurate information. However, the currently emerging metagenomic approaches including next-generation sequencing technologies can provide the reliable information and reveal very useful information about the metagenome of environmental microorganisms, which play an important role in the biogeochemical cycles and degradation and detoxification of environmental pollutants using culture-independent molecular techniques. Therefore, this chapter provides an overview of the metagenomic approaches and their applications in microbial ecology and bioremediation.