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Gene conversions are nonreciprocal sequence exchanges between genes. They are relatively common in Saccharomyces cerevisiae, but few studies have investigated the evolutionary fate of gene conversions or their functional impacts. Here, we analyze the evolution and impact of gene conversions between the two genes encoding 2-deoxyglucose-6-phosphate phosphatase in S. cerevisiae, Saccharomyces paradoxus and Saccharomyces mikatae. Our results demonstrate that the last half of these genes are subject to gene conversions among these three species. The greater similarity and the greater percentage of GC nucleotides in the converted regions, as well as the absence of long regions of adjacent common converted sites, suggest that these gene conversions are frequent and occur independently in all three species. The high frequency of these conversions probably result from the fact that they have little impact on the protein sequences encoded by these genes.

genome

Haute fréquence de conversions géniques entre les gènes codant pour la phosphatase du 2-déoxyglucose 6-phosphate chez trois espèces du genre<i>Saccharomyces</i>

Haute fréquence de conversions géniques entre les gènes codant pour la phosphatase du 2-déoxyglucose 6-phosphate chez trois espèces du genreSaccharomyces