A duplicated sev enhancer and Hsp70 promoter drive expression of a mutated dos cDNA in which the predicted Shc protein binding site has been mutated (amino acid replacement Y316F).
wild-type
dosY316F.hs.2sev rescues dosP115
dosY316F.hs.2sev rescues dosR31
A single copy of dosY316F.hs rescues the lethality of homozygous dosR31 or dosP115.