@ARTICLE{TreeBASE2Ref28658, author = {Aaron J Robinson and Donald O. Natvig}, title = {Diverse members of the Xylariales lack canonical mating-type regions}, year = {2019}, keywords = {Xylariales; Monosporascus; mating; genomics}, doi = {10.1016/j.fgb.2018.12.004}, url = {http://www.sciencedirect.com/science/article/pii/S1087184518301348?via%3Dihub}, pmid = {}, journal = {Fungal Genetics and Biology}, volume = {122}, number = {January}, pages = {47--52}, abstract = {A survey of genomes reported here for 10 isolates of Monosporascus spp. and an additional 25 genomes from other members of the Xylariales (representing 15 genera) available in public databases failed to reveal likely candidate genes for either MAT1-1 (mat A) or MAT1-2 (mat a) mating types. This was particularly surprising for isolates known to be homothallic, given that homothallic members of the Pezizomycotina typically possess a MAT1-1-1 (mat A-1) gene and one or both of two other closely-linked mating-type genes, MAT1-1-2 (mat A-2) and MAT1-1-3 (mat A-3), in addition to MAT1-2-1 (mat a-1). While genes related to MAT1-2-1 and MAT1-1-3 were present, it is not clear that any of the observed genes are true orthologs of mating-type genes. Rather, several appear to be orthologs of the MATA_HGM (high-mobility group) family genes with non-mating-type functions. The genomes examined represent substantial diversity within the order and include M. cannonballus, M. ibericus, Xylaria hypoxylon, X. striata, Daldinia eschscholzii, Eutypa lata, Rosellinia necatrix, Microdochium bolleyi and several others. We employed a number of avenues to search for homologs, including multiple BLAST approaches and examination of annotated genes adjacent to genes known to flank mating regions in other members of the Ascomycota. The results suggest that the mating regions have been lost from, or altered dramatically in, the Xylariales genomes examined and that mating and sexual development in these fungi are controlled differently than has been reported for members of the Pezizomycotina studied to date.} }

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