**3.11 Specified gene enrichment in DNA**

Genes are the functional units, they control the phenotypes of a particular organism. For the quest of specific function, gene enrichment technique is used, which in return increases the efficiency of cloning prospective and also leads to the discovery of uncharacterized genes from a microbial community. The typical methods for the enrichment are to control the environment of the community by exposing them to pressure, temperature, pH, light, or electric shock. This in return controls the phenotype of the genes. The enrichment techniques include suppressive subtractive hybridization phage display and affinity capture [96, 97].
