RESUMEN
Red/ET recombination, a powerful homologous recombination system based on the Red operon of lambda phage or RecE/ RecT from Rac phage, provides an innovative approach for DNA engineering. Deletion, insertion and mutation can be quickly and precisely performed on the target gene mediated by Red/ET recombination with PCR derived DNA fragments or oligonucleotides. This technical platform has extensive applications in biomedical field including bacterial artificial chromosome modification, gene knock-out construction and genetic modification of E. coli strains as well as some other kinds of microorganisms. Recently, Red/ET recombination was improved in several aspects so that it becomes more powerful and maneuverable. The characteristic and development of Red/ET recombination and its biomedical applications were described in this review.