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Deleting a duplicate gene often results in a less severe phenotype than deleting a singleton gene, a phenomenon commonly attributed to functional compensation among duplicates. However, duplicate genes rapidly diverge in expression patterns after duplication, making functional compensation less probable for ancient duplicates. Case studies suggested that a gene may provide compensation by altering its expression upon removal of its duplicate copy. On the basis of this observation and a genomic analysis, it was recently proposed that transcriptional reprogramming and backup among duplicates is a genomewide phenomenon in the yeast Saccharomyces cerevisiae. Here we reanalyze the yeast data and show that the high dispensability of duplicate genes with low expression similarity is a consequence of expression similarity and gene dispensability, each being correlated with a third factor, the number of protein interactions per gene. There is little evidence supporting widespread functional compensation of divergently expressed duplicate genes by transcriptional reprogramming.

Transcriptional Reprogramming and Backup Between Duplicate Genes: Is It a Genomewide Phenomenon?