Table 3: Gcn1p and Gcn20p are required for the increase of PRF efficiency in response to amino acid starvation.

Yeast strains and relevant mutations% frameshift rates  ± SD
Normal growth3-AT treated

Wild type4.0 ± 0.29.2 ± 0.5
(gcn1)4.3 ± 0.14.4 ± 0.2
(gcn20)4.4 ± 0.24.3 ± 0.4
(gcn1/gcn20)4.7 ± 0.24.3 ± 0.5

% frameshift rates were calculated as the percent of the ratio of β-galactosidase activities expressed from the Ty3-frameshift plasmid to the β-galactosidase activities expressed from the Ty3-frame fusion plasmid in the relevant yeast transformants.
±SD: standard deviations.