@ARTICLE{TreeBASE2Ref32137, author = {Andi Melissa Wilson and ruvini vinodya lelwala and Paul W.J. Taylor and Michael J. Wingfield and Brenda D Wingfield}, title = {Unique patterns of mating pheromone presence and absence could result in the ambiguous sexual behaviors of Colletotrichum species}, year = {2021}, keywords = {1. Colletotrichum 2. Sexual reproduction 3. Filamentous fungi 4. Mating pheromones 5. Cognate receptors 6. Gene loss 7. Ancestral state reconstruction }, doi = {10.1093/g3journal/jkab187}, url = {http://}, pmid = {}, journal = {G3}, volume = {11}, number = {9}, pages = {jkab187}, abstract = {Colletotrichum species are known to engage in unique sexual behaviours that differ significantly from the mating strategies of other filamentous ascomycete species. For example, most ascomycete fungi require the expression of both the MAT1-1-1 and MAT1-2-1 genes to induce sexual reproduction. In contrast, all isolates of Colletotrichum harbour only the MAT1-2-1 gene and yet, are capable of recognizing suitable mating partners and producing sexual progeny. The molecular mechanisms contributing to mating types and behaviours in Colletotrichum are, however, unknown. A comparative genomics approach analysing 35 genomes, representing 31 Colletotrichum species and two Verticillium species, was used to elucidate a putative molecular mechanism underlying the unique sexual behaviours observed in Colletotrichum species. The existence of only the MAT1-2 idiomorph was confirmed across all species included in this study. Comparisons of the loci harbouring the two mating pheromones and their cognate receptors revealed interesting patterns of gene presence and absence. The results showed that these genes have been lost multiple, independent times over the evolutionary history of this genus. These losses indicate that the pheromone pathway no longer plays an active role in mating type determination, suggesting an undiscovered mechanism by which mating partner recognition is controlled in these species. This further suggests that there has been a redirection of the underlying genetic mechanisms that regulate sexual development in Colletotrichum species. This research thus provides a foundation from which further interrogation of this topic can take place. } }

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