A recent paper in MBE presents evidence that the Taphrinomycota (containing S. pombe and Pneumocystis) are in fact a monophyletic group. This is considered an early branch in the Ascomycota with the Pezizomycotina (filamentous ascomycete fungi like Neurospora and Aspergillus) and Saccharomycotina (fungi mainly with yeast forms including Candida and Saccharomyces). The monophyly of Taphrinomyoctina fungi is something that has been fairly accepted but there are a few publications reporting conflicting evidence in some sets gene trees. This conflict is most likely due to Long Branch Attraction (LBA) and the Philippe lab has long worked on this problem of LBA working to develop tools like PhyloBayes that attempt to correct for LBA with a parameter rich model and using lots of data (like whole [...]
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Estimating divergence times is notorious difficult and the field can be downright rancorous with some being accused of reading tea leaves and chicken entrails – interesting reading for personalities as much as the different scientific approaches. There are several different approaches to trying to estimate a divergence time among species, using [...]
WrightFisher talks about a paper & the commentary in Science describing how alignment uncertainty should be taken into account when doing phylogenetic analyses on genomic datastets (some might call this phylogenomics, but Dr Eisen won’t). If the sequence alignment is treated as a random variable (and in bayesian approaches have a prior based on result(s) from an alignment program) then more accurate reconstruction. Robin points [...]
Robin reviews recent Nature paper by Ilan Wapinski et al describing the orthogroups they built from multiple fungal genomes. I’ve been remiss in reviewing the paper myself, but they’ve created an important resource in the SYNERGY tool for orthology identification and a database of orthologs of some ascomycete fungi. I am excited there [...] Lots of papers in Mycologia (subscription required) this month of different groups analyzing the fine-scale relationships of many different fungal clades using the loads of sequences that were generated as part of the Fungal Tree of Life [...] |
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