Reference: Nguyen HV and Gaillardin C (2005) Evolutionary relationships between the former species Saccharomyces uvarum and the hybrids Saccharomyces bayanus and Saccharomyces pastorianus; reinstatement of Saccharomyces uvarum (Beijerinck) as a distinct species. FEMS Yeast Res 5(4-5):471-483

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Abstract


Analysis of the nucleotide sequence of the GDH1 homologues from Saccharomyces bayanus strain CBS 380(T) and S. pastorianus strains showed that they share an almost identical sequence, SuGDH1*, which is a diverged form of the SuGDH1 from the type strain of the former species S. uvarum, considered as synonym of S. bayanus. SuGDH1* is close to but differs from SuGDH1 by the accumulation of a high number of neutral substitutions designated as Multiple Neutral Mutations Accumulation (MNMA). Further analysis carried out with three other markers, BAP2, HO and MET2 showed that they have also diverged from their S. uvarum counterparts by MNMA. S. bayanus CBS 380(T) is placed between S. uvarum and S. pastorianus sharing MET2, CDC91 sequences with the former and BAP2, GDH1, HO sequences with the latter. S. bayanus CBS 380(T) has been proposed to be a S. uvarum/S. cerevisiae hybrid and this proposal is confirmed by the presence in its genome a S. cerevisiae SUC4 gene. Strain S. bayanus CBS 380(T), with a composite genome, is genetically isolated from strains of the former S. uvarum species, thus justifying the reinstatement of S. uvarum as a distinct species.

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Nguyen HV, Gaillardin C
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