Extraordinary genetic diversity in a wood decay mushroom

Maria A. Baranova, Maria D. Logacheva, Aleksey A. Penin, Vladimir B. Seplyarskiy, Yana Y. Safonova, Sergey A. Naumenko, Anna V. Klepikova, Evgeny S. Gerasimov, Georgii A. Bazykin, Timothy Y. James, Alexey S. Kondrashov

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

Populations of different species vary in the amounts of genetic diversity they possess. Nucleotide diversity π, the fraction of nucleotides that are different between two randomly chosen genotypes, has been known to range in eukaryotes between 0.0001 in Lynx lynx and 0.16 in Caenorhabditis brenneri. Here, we report the results of a comparative analysis of 24 haploid genotypes (12 from the United States and 12 from European Russia) of a split-gill fungus Schizophyllum commune. The diversity at synonymous sites is 0.20 in the American population of S. commune and 0.13 in the Russian population. This exceptionally high level of nucleotide diversity also leads to extreme amino acid diversity of protein-coding genes. Using whole-genome resequencing of 2 parental and 17 offspring haploid genotypes, we estimate that the mutation rate in S. commune is high, at 2.0 × 10-8 (95% CI: 1.1 × 10-8 to 4.1 × 10-8) per nucleotide per generation. Therefore, the high diversity of S. commune is primarily determined by its elevated mutation rate, although high effective population size likely also plays a role. Small genome size, ease of cultivation and completion of the life cycle in the laboratory, free-living haploid life stages and exceptionally high variability of S. commune make it a promising model organism for population, quantitative, and evolutionary genetics.

Original languageEnglish
Pages (from-to)2775-2783
Number of pages9
JournalMolecular Biology and Evolution
Volume32
Issue number10
DOIs
Publication statusPublished - Oct 2015
Externally publishedYes

Keywords

  • de novo mutation rate
  • genetic variation
  • hyperdiversity
  • population genetics

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