Abstract: ABSTRACT: An original yeast-based phenomic model for DeltaF508 CFTR, by far the most prevalent allele of the CFTR gene responsible for cystic fibrosis, has been developed by the groups of Elizabeth A Miller and John L Hartman. This model allows potential modifier genes of the DeltaF508 CFTR allele to be uncovered. Hence, brewer's yeast Saccharomyces cerevisiae is not only needed at happy hour, it also represents an invaluable tool for human geneticists.