transphenotypic phenotype result mutual genetic suppression transphenotypic genetic suppression PSI-MI transphenotypic suppressing genetic interaction A genetic mutual suppression in which each genetic perturbation results in opposite phenotypes (for example, one genetic perturbation results in an increased quality phenotype and the second genetic perturbation results in a decreased quality phenotype), and their combination (the double genetic perturbation) results in an intermediate phenotype that is at least closer to wild type than the most severe phenotype of the individual genetic perturbations. Note that the double genetic perturbation phenotype may be expected according to some chosen neutrality function. MI:2390