PhyML (Phylogenetic Inference Maximum Likelihood) is a widely used software program for estimating maximum likelihood phylogenetic trees from DNA or amino acid sequences. It is known for its speed and accuracy, particularly with large datasets. 1. Getting Started with PhyML
Installation/Execution: You can run PhyML by executing the binary (e.g., PhyML-3.1_your-operative-system) either by double-clicking it or through a terminal.
Input Data: The program requires a sequence alignment file, typically in PHYLIP or FASTA format. Interfaces:
Menu Interface: Loads once you provide a valid alignment file, allowing you to configure settings interactively.
Command Line: Allows advanced users to set all parameters in a single command, which is useful for automation or large-scale analyses.
This video provides a tutorial on building a phylogenetic tree with PhyML 3.0: Building a phylogenetic tree using PhyML 3.0 YouTube · Dec 27, 2018 2. Key Steps in a Typical Analysis
A standard phylogenetic analysis using PhyML involves these steps: Preparation: Acquire your sequences (e.g., FASTA format).
Alignment: Align the sequences using tools like MUSCLE or ClustalW.
PhyML Execution: Run PhyML to generate the maximum likelihood tree.
Visualization: Visualize the resulting tree file using tools like FigTree. 3. Key Parameters and Options
Evolutionary Model: Selection of the best-fit model (e.g., GTR, HKY) for DNA or amino acid data.
Branch Support: Perform nonparametric bootstrap analysis to assess the robustness of the tree.
Tree Searching: Define how the algorithm searches for the optimal topology. 4. Online Resources
PHYML Online: A web server version is available at ATGC LRIMM, which provides a user-friendly interface for running the software without local installation.
Tutorial Example: A tutorial demonstrating the creation of a tree using MUSCLE and PhyML is available via this YouTube video.
Leave a Reply