title: The spatial scale of genetic differentiation in a model organism: the wild yeast Saccharomyces paradoxus.
abstract: Little information is presently available on the factors promoting genetic divergence in eukaryotic microbes. We studied the spatial distribution of genetic variation in Saccharomyces paradoxus, the wild relative of Saccharomyces cerevisiae, from the scale of a few centimetres on individual oak trees to thousands of kilometers across different continents. Genealogical analysis of six loci shows that isolates from Europe form a single recombining population, and within this population genetic differentiation increases with physical distance. Between different continents, strains are more divergent and genealogically independent, indicating well-differentiated lineages that may be in the process of speciation. Such replicated populations will be useful for studies in population genomics.
authors.affiliation: Division of Biology and NERC Centre for Population Biology, Imperial College London, Silwood Park, Ascot, Berks SL5 7PY, UK. v.koufopanou@imperial.ac.uk
authors.forename: Vassiliki
authors.initials: V
authors.lastname: Koufopanou
authors.forename: Joseph
authors.initials: J
authors.lastname: Hughes
authors.forename: Graham
authors.initials: G
authors.lastname: Bell
authors.forename: Austin
authors.initials: A
authors.lastname: Burt
mesh_terms: D001483:Base Sequence; D003710:Demography; D005800:Genes, Fungal / Q000235:genetics; D049810:Genetic Speciation; D014644:Genetic Variation; D005828:Genetics, Population; D005843:Geography; D008969:Molecular Sequence Data; D012440:Saccharomyces / Q000235:genetics*; D017422:Sequence Analysis, DNA