[Diversity and evolution of LTR retrotransposons in the genome of Phanerochaete chrysosporium (Fungi: Basidiomycota)].

The diversity of mobile elements, in particular LTR retrotransposons, in basidiomycetes fungi has been poorly studied. Using complete genomic sequences, we have for the first time screened the genome of the lignin-degrading fungus Phanerochaete chrysosporium for LTR retrotransposons. A surprisingly high diversity of LTR retrotransposons was found. Twenty-three novel mobile elements from two superfamilies, Pseudoviridae and Metaviridae, were described. The proportion of LTR retrotransposons in the P. chrysosporium genome is low, constituting only about 3%. Nevertheless, LTR retrotransposons of P. chrysosporium represent a dynamic part of the genome, which is evidenced by the presence of intact copies with signs of recent transposition and numerous solo LTR elements. Phylogenetic and structural analyses detected mobile elements having characteristics that had been previously unknown for other LTR retrotransposons.