The Saccharomyces cerevisiae pol3-D463A mutation mimicking human POLD1-D458A elevates the mutation rate in haploid strains when no wild-type POL3 allele is present.
References:
Herr, A. J. et al. Mutator suppression and escape from replication error-induced extinction in yeast. PLoS Genet 7, e1002282 (2011). https://pubmed.ncbi.nlm.nih.gov/22022273/