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TRAD
TRAD (Tip-Rooting and
Ancestor-Dating)
| Name: | TRAD |
| Main function: | As suggested by the title, used for rapidly
evolving viral strains collected over different times, without a good outgroup |
| Requirement: | (If working with a tree with >60,000 leaves): a
fast desktop computer with at least 8GB RAM |
| Keywords: | phylogenetics, dating, rooting, virus |
| Version: | 1.0.0.0 |
| Publisher: | XiaLab |
| Support: | Dr. Xuhua Xia at xxia@uottawa.ca |
| Citation: | Xia, X. 2025. TRAD: Tip-Rooting and Ancestor-Dating, version 1.2.0. https://dambe.bio.uottawa.ca/TRAD/TRAD.aspx |
 For Windows computers:
If your 64-bit Windows PC is new or updated, then you can launch TRAD now. Otherwise, install and run TRAD.
 For Macintosh computers:
- Download TRAD.msi
- Download Whisky and unzip it.
- Follow the concise instructions
Usage after installation:
- Click 'Phylogenetics | TRAD
- Input: a phylogenetic tree in Newick format, with collection time at the end of the sequence name. A test file Test_Fig1.dnd is provided.
- Output: evolutionary rate, the time of origin of the most recent common ancestor, the most likely rooting point
Warning:
- GenBank contains fake SARS-CoV-2 genomes. See my paper for details. You should not include such genomes in your analysis.
- You should include only viral sequences isolated from natural hosts, not from specially treated experimental animals.
- Do not include genomes from viruses that have been preserved for a long time (e.g., by deep-freezing) and then thawed and used in experiments. Such viruses have been frozen in evolution. Their genomes will mislead you to a very slow evolutionary rate and erroneous dating of the common ancestor.
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