Inference of multiple mergers while dating a pathogen phylogeny
Inference of multiple mergers while dating a pathogen phylogeny
复制标题
确定病原体系统发育时多重合并的推断
DOI:
10.1101/2023.09.12.557403
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发表时间:
2023
期刊:
影响因子:
--
通讯作者:
Helekal D
中科院分区:
文献类型:
--
作者:
Helekal D
The vast majority of pathogen phylogenetic studies do not consider the possibility of multiple merger events being present, where a single node of the tree leads to more than two descendent branches. These events are however likely to occur when studying a relatively small population or if there is high variability in the reproductive chances. Here we consider the problem of detecting the presence of multiple mergers in the context of dating a phylogeny, that is determining the date of each of the nodes. We use the Lambda-coalescent theory as a modelling framework and show how Bayesian inference can be efficiently performed using a Billera-Holmes- Vogtmann space embedding and a customised Markov Chain Monte Carlo sampling scheme. We applied this new analysis methodology to a large number of simulated datasets to show that it is possible to infer if and when multiple merger events occurred, and that the phylogenetic dating is improved as a result of taking this information into account. We also analysed real datasets ofVibrio choleraeandMycobacterium tuberculosisto demonstrate the relevance of our approach to real pathogen evolutionary epidemiology. We have implemented our new methodology in a R package which is freely available at https://github.com/dhelekal/MMCTime.
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