The reacquisition of biotin prototrophy in Saccharomyces cerevisiae involved horizontal gene transfer, gene duplication and gene clustering.

Journal Article (Journal Article)

The synthesis of biotin, a vitamin required for many carboxylation reactions, is a variable trait in Saccharomyces cerevisiae. Many S. cerevisiae strains, including common laboratory strains, contain only a partial biotin synthesis pathway. We here report the identification of the first step necessary for the biotin synthesis pathway in S. cerevisiae. The biotin auxotroph strain S288c was able to grow on media lacking biotin when BIO1 and the known biotin synthesis gene BIO6 were introduced together on a plasmid vector. BIO1 is a paralog of YJR154W, a gene of unknown function and adjacent to BIO6. The nature of BIO1 illuminates the remarkable evolutionary history of the biotin biosynthesis pathway in S. cerevisiae. This pathway appears to have been lost in an ancestor of S. cerevisiae and subsequently rebuilt by a combination of horizontal gene transfer and gene duplication followed by neofunctionalization. Unusually, for S. cerevisiae, most of the genes required for biotin synthesis in S. cerevisiae are grouped in two subtelomeric gene clusters. The BIO1-BIO6 functional cluster is an example of a cluster of genes of "dispensable function," one of the few categories of genes in S. cerevisiae that are positionally clustered.

Full Text

Duke Authors

Cited Authors

  • Hall, C; Dietrich, FS

Published Date

  • December 2007

Published In

Volume / Issue

  • 177 / 4

Start / End Page

  • 2293 - 2307

PubMed ID

  • 18073433

Pubmed Central ID

  • PMC2219469

International Standard Serial Number (ISSN)

  • 0016-6731

Digital Object Identifier (DOI)

  • 10.1534/genetics.107.074963


  • eng

Conference Location

  • United States