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Significance Many studies have focused on the mechanisms of long-term retention of gene duplicates, such as the gain of functions or reciprocal losses. However, such changes are more likely to occur if the duplicates are maintained for a long period. This time span will be short if duplication is immediately deleterious. We measured the distribution of fitness effects of gene duplication for 899 genes in budding yeast. We find that gene duplication is more likely to be deleterious than beneficial. However, contrary to previous models, in general, gene duplication does not affect fitness by altering the organization of protein complexes. We show that expression attenuation may protect complexes from the effects of gene duplication.

Expression attenuation as a mechanism of robustness against gene duplication