blast-align-tree 1.0.0

BLAST, align, and build phylogenetic trees from genomic databases

blast-align-tree

A pipeline to identify BLAST hits and perform phylogenetic analysis across multiple queries and local genome databases.

Introduction

A common task in bioinformatics is to find similar genes across a set of genomes and compare them using phylogenetic methods. As an alternative to using online tools for such analyses, researchers may wish to download genomes of interest for local BLAST and downstream analyses. Homolog curation, tree construction, header parsing, and visualization alongside other datasets (e.g. gene expression) can give quick insights into a gene family of interest.

Installation

Python package

pip install blast-align-tree

This installs three console commands:

Command	Purpose
blast-align-tree	Run the pipeline (BLAST → align → tree → visualize)
bat-genome-selector	Tkinter GUI for building blast-align-tree commands
blast-align-tree-fetch	Download bundled genome FASTAs into ./genomes/

From a fresh clone of this repo you can do an editable install instead:

pip install -e .

External tools (must be on PATH)

pip cannot install these — use conda/mamba or your system package manager.

• BLAST+ (makeblastdb, blastdbcmd, tblastn, blastp, psiblast)
• MAFFT (≥ 7) — default aligner
• Clustal Omega (clustalo) — alternative aligner
• trimAl — alignment cleanup
• FastTree and/or RAxML-NG — tree inference
• R with ggtree, ape, phytools, ggplot2, optparse, treeio, tidytree, broom
• HMMER (hmmscan, hmmpress) — optional, only needed for --hmm

Conda YAML files covering all of the above live under environments/. Pick the one for your platform and create an env:

conda (Linux):

conda env create -f environments/bat-environment-linux.yml
conda activate bat
pip install blast-align-tree

mamba / micromamba (Linux — faster solver):

mamba env create -f environments/bat-environment-linux.yml
mamba activate bat
pip install blast-align-tree

macOS (Apple Silicon or Intel):

mamba env create -f environments/bat-environment-ARMorIntel-mac.yml
mamba activate bat
pip install blast-align-tree

Windows:

mamba env create -f environments/bat-environment-windows.yml
mamba activate bat
pip install blast-align-tree

Verify everything is wired up:

blast-align-tree --check-env

HMM profiles need hmmpress

The repo ships .hmm input files under hmm_files/ (e.g. hmm_files/kinase.hmm) but not the .h3* binary indices — those are build artifacts and are deleted from the repo. Before using --hmm, build the index locally:

hmmpress hmm_files/kinase.hmm

This produces kinase.hmm.h3f, .h3i, .h3m, .h3p alongside the input.

Fetching genome databases

Genome FASTAs are too large to bundle in the pip package. The downloader reads a manifest and drops the selected genomes into ./genomes/:

blast-align-tree-fetch               # default set 🌱 🌿 🫘
blast-align-tree-fetch --all         # everything listed in the manifest 🌍
blast-align-tree-fetch --list        # show available genomes + sizes

The default set 🌱🌿🫘🍅 is:

• 🌱 TAIR10 CDS — Arabidopsis thaliana coding sequences
• 🌿 TAIR10 proteins — Arabidopsis thaliana proteome
• 🫘 Pvul218 CDS — Phaseolus vulgaris (common bean) coding sequences
• 🍅 Niben261 proteins — Nicotiana benthamiana proteome (v2.6.1)

--all 🌍 additionally pulls the rest of the hosted lineup:

• Other plants: 🫛 cowpea CDS
• Animals / fungus (fetched into ./genomes/animals/): 🧑 human CDS, 🐭 mouse CDS, 🐀 rat CDS, 🐒 chimp CDS, 🐟 zebrafish CDS, 🪰 fruit fly CDS, 🪱 C. elegans CDS, 🍞 yeast ORFs (S. cerevisiae S288C)

Run blast-align-tree-fetch --list for the full lineup and sizes.

All pipeline runs should happen in the directory that contains ./genomes/.

GUI: bat-genome-selector

The easiest way to build a valid blast-align-tree invocation is the Tkinter GUI. Launch it from a directory that contains a genomes/ folder:

bat-genome-selector

Key features

• Auto-discovery. Scans ./genomes/ (recursively) for .fa, .faa, .fas, .fasta, .fna files and ignores BLAST index sidecars.
• Header auto-detection. Peeks at the first FASTA record in each database and suggests a plausible -hdr token (e.g. gene:, locus=, polypeptide=), with a live "Parsed name" preview so you can see exactly what will appear on the tree.
• Per-row controls. One row per genome: include checkbox, query column, -hdr, -hdr_sfx, -n (hits to keep), nucleotide/protein type, and a "build DB" shortcut that runs makeblastdb when the BLAST indices are missing.
• Bulk actions. Select All Hits, Deselect All Hits, Clear Fields, Refresh, plus a Default -n spinbox and Set All -n button.
• Options panel. Aligner (Clustal Omega or MAFFT + mode), tree builder (FastTree or RAxML), BLAST type (tblastn/blastp), thread count.
• Advanced panel (collapsible): outgroups (-add, -add_db), AA slice (-aa), motif patterns (regex or PROSITE, overlap toggle), and HMM profiles (--hmm).
• Generate Command / Copy to Clipboard. Produces a ready-to-paste blast-align-tree … command.
• Recent Runs tab. Lists past ENTRY/runs/TIMESTAMP/ directories in the current working directory so you can quickly jump back to prior results.

Example output

The default genome set includes Arabidopsis TAIR10 CDS. The example below runs the pipeline for a SERK query and redraws the resulting tree with a new subnode/outgroup:

blast-align-tree -q AT4G33430.1 -qdbs TAIR10cds.fa \
                 -n 15 15 15 \
                 -dbs TAIR10cds.fa Pvul218cds.fa Vung469cds.fa \
                 -hdr gene: polypeptide= locus=

The pipeline creates a folder AT4G33430.1/ in your working directory. The timestamped run root keeps the tree PDFs. Newick tree files, gene lists, alignment FASTAs, mappings, features, BLAST hit FASTAs, and per-genome summaries go under AT4G33430.1/runs/<TIMESTAMP>/genes_alignments_trees/.

After the run finishes, the pipeline prints a re-draw hint. For example, to reroot on an outgroup (-a AT5G10290) and zoom in on a subnode (-n 45):

Rscript "<bundled-visualize_tree.r>" -e AT4G33430.1 -b SERK_tree \
        --subdir "runs/<TIMESTAMP>" -a AT5G10290 -n 45

The bundled path is printed for you at the end of each pipeline run, already wrapped in double quotes — keep the quotes when copy-pasting, especially on Windows, where unquoted paths can cause Rscript to segfault if they contain spaces or backslashes that the shell misparses.

Tutorial

Run blast-align-tree for ACC Oxidase

Find 15 homologs of Arabidopsis ACC Oxidase 1 from three plant genomes using tblastn against complete CDS databases. -q specifies the query locus, -qdbs the database it lives in, -dbs the databases to search, and -hdr the regex tokens used to parse gene names out of each database's FASTA headers.

blast-align-tree -q AT2G19590.1 -qdbs TAIR10cds.fa \
                 -n 15 15 15 \
                 -dbs TAIR10cds.fa Pvul218cds.fa Vung469cds.fa \
                 -hdr gene: polypeptide= locus=

This creates AT2G19590.1/ with tree PDFs at the timestamped run root and Newick tree files, alignment files, BLAST hit FASTAs, and per-genome summaries under genes_alignments_trees/.

A powerful feature of ggtree is the ability to plot associated data. Each run produces two complementary tree PDFs:

1. Text version — gene symbols and dataset values printed as labels next to each tip.
2. Heatmap version — the same tree with associated data rendered as a coloured heatmap alongside the tips.

By default, both include expression data from the Klepikova Arabidopsis expression atlas (headers are matched to the AtGenExpress / eFP browser tissue naming). The screenshot below shows the heatmap version:

A separate PDF with .MSA.pdf appended shows a cartoon alignment — useful for spotting large differences in domain architecture. Open the underlying FASTA files in genes_alignments_trees/ to inspect the alignment in detail.

Redraw the ACC Oxidase tree

You can re-run visualize_tree.r at any time to produce new PDFs. The pipeline prints a ready-to-edit Rscript … command at the end of each run; copy it and tweak options such as:

• -b <NAME> — filename stem for the new PDFs
• -a <ID> — reroot on this outgroup
• -n <NODE> — draw a subtree at this node (use --help for the full option list)
• -k 1 — show bootstraps
• -l 0 — hide node number labels
• -m 2 — enlarge gene-symbol text

For example, reroot the default ACO tree on JRG21 (AT2G38240) and zoom into the ACO clade at node 58:

Rscript "<bundled-visualize_tree.r>" -e AT2G19590.1 -b ACO_v3 \
        --subdir "runs/<TIMESTAMP>" -a AT2G38240 -n 58 -k 1 -l 0 -m 2

The -n option is especially helpful for extracting a subset of the tree as a FASTA. Sequences are listed in the FASTA in the same order as the tree, and trimAl is used to strip blank-only alignment columns — useful for a quick view of conserved residues (e.g. the ACO active site) in a viewer like AliView.

BLASTP instead of TBLASTN

Use --blast_type blastp against protein databases. The example below pulls 10 NIMIN-1 homologs from the Arabidopsis and Nicotiana benthamiana proteomes:

blast-align-tree --blast_type blastp \
                 -q AT1G02450.1 -qdbs TAIR10protein.fa \
                 -n 10 10 \
                 -dbs TAIR10protein.fa Niben261_genome.annotation.proteins.fasta \
                 -hdr gene: id

Multiple queries

You can pass several query sequences with -q; the pipeline extracts each from the database listed at the matching position in -qdbs, de-duplicates, then searches each -dbs entry. The example below uses three queries drawn from two databases and searches two other databases:

blast-align-tree -q AT5G45250.1 Phvul.007G077500.1 AT5G17890.1 \
                 -qdbs TAIR10cds.fa Pvul218cds.fa TAIR10cds.fa \
                 -n 3 4 \
                 -dbs TAIR10cds.fa Vung469cds.fa \
                 -hdr gene: locus=

Adding a new genome

You can drop additional genomes into ./genomes/ and use them alongside the bundled ones. For each new genome you need a local BLAST database.

For CDS files:

makeblastdb -in GenomeCDS.fa -parse_seqids -dbtype nucl

For protein files:

makeblastdb -in GenomeProteins.fa -parse_seqids -dbtype prot

Example: add Nicotiana tabacum and rebuild an earlier tree

Download an annotated tobacco proteome into ./genomes/:

• N. tabacum v4.5 from Sol Genomics → Nitab-v4.5_proteins_Edwards2017.fasta

Build the BLAST database:

cd genomes
makeblastdb -in Nitab-v4.5_proteins_Edwards2017.fasta -parse_seqids -dbtype prot
cd ..

Inspecting the first record of Nitab-v4.5_proteins_Edwards2017.fasta shows that headers use a gene id followed by a description — -hdr id keeps just the first token.

Now build a SOBIR1 homolog tree across Arabidopsis, N. benthamiana, and the freshly added tobacco proteome:

blast-align-tree --blast_type blastp \
                 -q AT2G31880.1 -qdbs TAIR10protein.fa \
                 -n 10 10 10 \
                 -dbs TAIR10protein.fa \
                       Niben261_genome.annotation.proteins.fasta \
                       Nitab-v4.5_proteins_Edwards2017.fasta \
                 -hdr gene: id id

The run produces a tree PDF with tobacco SOBIR1 homologs slotted in alongside the N. benthamiana and Arabidopsis sequences.

Rebuild the SOBIR1 tree with MAFFT and RAxML

By default the pipeline aligns with Clustal Omega and infers the tree with FastTree, but both are swappable. The command below rebuilds the same SOBIR1 tree (Arabidopsis + N. benthamiana + tobacco) using MAFFT in linsi mode and RAxML-NG for the tree inference:

blast-align-tree --blast_type blastp \
                 --aligner mafft --mafft_mode linsi \
                 --tree_builder RAxML \
                 -q AT2G31880.1 -qdbs TAIR10protein.fa \
                 -n 10 10 10 \
                 -dbs TAIR10protein.fa \
                       Niben261_genome.annotation.proteins.fasta \
                       Nitab-v4.5_proteins_Edwards2017.fasta \
                 -hdr gene: id id

RAxML-NG is noticeably slower than FastTree but provides maximum- likelihood branch support via bootstrapping. Comparing the two trees is a quick sanity check that any clades you care about are stable across inference methods.

Use repeated rounds of querying to refine your trees, search different genome versions, and compare aligners / tree builders before drawing strong conclusions.

Future features

We are currently working on:

1. Iterative BLAST using a first set of hits as secondary queries
2. Better organization of query and sub-query folders
3. Displaying a subsequence of the MSA in the alignment PDF
4. Richer motif / HMM visualization overlaid on the MSA

If you'd like to contribute, reach out to Ben and Adam: [e-mail] and [e-mail].