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Do TE activity and counteracting genome defenses, RNAi and methylation, shape the sex lives of smut fungi?

Plant Signal. Behav. 8:e23853 (2013)
Publishers Version online available 03/2014 as soon as is submitted to ZB.
The availability of three genomes from smut fungi differing in mating, TE load and genome defense mechanisms, allowed a comparative analyses and a discussion on evolutionary forces shaping them. A complex balance of selective forces seems at play. A bipolar mating system in Ustilago hordei promotes selfing, advantageous for successful niche occupation but favoring accumulation of repetitive DNA, including TEs. TE activity may have caused genome variations necessary for these obligate parasites under high host selection pressures. Higher TE activity is balanced by genome defenses through recombination, RNAi, methylation and RIP mutagenesis. In tetrapolar U. maydis, lacking silencing and possibly methylation mechanisms, reduced inbreeding potential favors removal of repetitive DNA, presumably by its highly-efficient recombination system.
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Publication type Article: Journal article
Document type Scientific Article
Keywords Sporisorium; Ustilago; gene silencing; genome research; plant pathogen
Reviewing status