Rice Gene Targeting by Homologous Recombination with Positive-Negative Selection Strategy.

Gene targeting (GT) is a technique that alter the structure of the specific genes at their original loci in the genome by homologous recombination (HR). It plays an important role in functional genomics because it enables precise modification of the endogenous genes into desired forms such as knockout, knock-in, introduction of point mutations, as well as generation of fusion genes. Also, site-directed mutagenesis by GT can also be applied as an excellent technique for molecular breeding and gene therapy, because it can directly reflect the knowledge acquired from functional genomics. In this section, we introduce well-established GT procedure in rice in combination with positive-negative-selection (PNS) strategy.