Recombinant DNA technology, Polymerase Chain Reaction (PCR) or gene amplification, and Enzyme-Linked Immuno-sorbent Assay (ELISA) are some of the techniques that serve the purpose of early diagnosis. This is the use of recombinant DNA technology in gene therapy.
Gene therapy is a collection of methods that allows the correction of a gene defect that has been diagnosed in a child/embryo.