Q. 42 ELISA technique is based on the principles of antigen-antibody
interaction. Can this technique be used in the molecular diagnosis of a genetic disorder, such as phenylketonuria?

Yes, one can use antibody against the enzyme (that is responsible for the metabolism of phenylanaline) to develop ELISA based diagnostic technique. The patient, in which the enzyme-protein complex is absent would give a negative result in ELISA when compared to the normal individual.