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Fig. 7 | Fungal Biology and Biotechnology

Fig. 7

From: Emergence and loss of spliceosomal twin introns

Fig. 7

Maximum likelihood phylogeny of the BioDA protein: Instances of stwintron loss. A subtree of the phylogenetic analysis depicted in Fig. 6, is shown in detail to highlight the loss of the stwintron from taxa of Sordariomycetes and Botryosphaeriales. Class-specific color coding is the same as in Fig. 3. Species that have lost the internal intron from the stwintron in their bioDA gene (retaining a standard intron at the stwintron position) have their name printed in green lettering. For the sake of simplicity, we have collapsed groups of related fungi that behave the same with respect to the stwintron. Independent events of internal intron loss are also indicated by the green triangles on the directly preceding branches. (NB. The position of the triangles does not correspond with the exact time point at which intron loss has taken place). The complete absence of intronic sequences at the stwintron position from the genes encoding the BioDA proteins in the separate Diaporthales clade and in two of the Botryosphaeriales (7 proteins in red lettering) may have occurred either in one or in two consecutive events of intron loss. Complete stwintron loss was indicated by a red triangle (as in the legend to Fig. 4). We annotated the tree for the two-step process in the case of P. capitalensis, first losing the internal intron in an ancestor shared with P.citricarpa (green triangle). The subsequent loss of the standard intron that remained after the first event (red triangle) resulted in the complete absence of intronic sequences from P. capitalensis bioDA

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