PCR in Metagenomics.

Metagenomics approach involves direct genetic analysis of environmental samples, evading the tedious culturing process. Polymerase chain reaction is one invaluable tool used for such analyses. Here, we describe one protocol for metagenomic DNA isolation that gives inhibitor-free DNA suitable for PCR and other genetic manipulations. Subsequently, the chapter describes the use of PCR as an indicator of quality of DNA and to amplify a marker of phylogeny. Further, the application of PCR for detection of specific genes and screening of metagenomic libraries is outlined.