Birth, death and horizontal transfer of the fumonisin biosynthetic gene cluster during the evolutionary diversification of Fusarium

R.H. Proctor, F. van Hove, A. Susca, G. Stea, M. Busman, T.A.J. van der Lee, C. Waalwijk, A. Moretti, T.J. Ward

Research output: Contribution to journalArticleAcademicpeer-review

70 Citations (Scopus)

Abstract

Fumonisins are a family of carcinogenic secondary metabolites produced by members of the Fusarium fujikuroi species complex (FFSC) and rare strains of Fusarium oxysporum. In Fusarium, fumonisin biosynthetic genes (FUM) are clustered, and the cluster is uniform in gene organization. Here, sequence analyses indicated that the cluster exists in five different genomic contexts, defining five cluster types. In FUM gene genealogies, evolutionary relationships between fusaria with different cluster types were largely incongruent with species relationships inferred from primary-metabolism (PM) gene genealogies, and FUM cluster types are not trans-specific. In addition, synonymous site divergence analyses indicated that three FUM cluster types predate diversification of FFSC. The data are not consistent with balancing selection or interspecific hybridization, but they are consistent with two competing hypotheses: (i) multiple horizontal transfers of the cluster from unknown donors to FFSC recipients and (ii) cluster duplication and loss (birth and death). Furthermore, low levels of FUM gene divergence in F.¿bulbicola, an FFSC species, and F.¿oxysporum provide evidence for horizontal transfer of the cluster from the former, or a closely related species, to the latter. Thus, uniform gene organization within the FUM cluster belies a complex evolutionary history that has not always paralleled the evolution of Fusarium
Original languageEnglish
Pages (from-to)290-306
JournalMolecular Microbiology
Volume90
Issue number2
DOIs
Publication statusPublished - 2013

Keywords

  • fujikuroi species complex
  • maximum-likelihood
  • gibberella-moniliformis
  • aspergillus-parasiticus
  • secondary metabolism
  • comparative genomics
  • adaptive evolution
  • multigene family
  • section liseola
  • mixed models

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