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Analysis underlying the manuscript describing Stitchr, the Python tool for generating full-length TCR sequences

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stitchr-paper-analysis

v 0.1.1

2022, Jamie Heather, MGH

This repo contains the raw data and scripts required to generate the plots for the Heather et al. 2022 publication in Nucleic Acids Research (DOI: 10.1093/nar/gkac190), describing stitchr, the Python tool for generating full-length, coding T cell receptor (TCR) sequences out of the minimally-reported TCR V/J/CDR3 that is most often available.

Requirements

This analysis is designed to be run in a bash environment, with the following installed:

  • python 3 (>= 3.6)
    • seaborn, numpy, pandas
  • git
  • fastq-dump

Raw data

There are four sources of bulk TCRseq data used to demonstrate the high-throughput capabilities of the stitchr suite of tools:

VDJdb

  • Manually annotated TCRs of known specificity, annotated from across the literature and various other databases.
  • Represents a variety of high- and low-throughput TCR sequencing techniques, performed by a variety of labs, and thus should be as unbiased as one could hope to get with respect to potential methodological confounders.
  • TRA and TRB chains.
  • V gene, J gene, and CDR3 junction amino acid sequence only available.
  • Links:

Emerson et al

  • Healthy donor peripheral blood bulk TCRseq.
  • Adaptive Biotechnologies' proprietary multiplex PCR from gDNA.
  • TRB only.
  • V gene, J gene, CDR3 junction amino acid and nucleotide sequence (87 nt total) available.
  • Randomly selected 5x samples (HIP02873, HIP02805, HIP02811, HIP02820, and HIP02855).
  • Links:

immuneSIM

Heather et al

  • Heather donor peripheral blood bulk TCRseq.
  • 5'RACE, UMI-barcoded amplification from cDNA, paired-end sequenced 2x250 on a MiSeq.
  • A fraction of the amplicons where R1 and R2 overlapped (presumably those where the RT reaction ran far enough) were merged using FLASH, producing long-read variable-domain spanning reads.
  • Most from a previous publication of the same lead author (JMH), with some additional samples from a later paper.
  • Links:
  • Raw merged FASTQ data available from SRA
    • See table below.
Donor Locus SRA container accession SRA run accession
HV01 TRA SRX2454454 SRR5137043
HV01 TRB SRX2454419 SRR5137008
HV02 TRA SRX2454424 SRR5137013
HV02 TRB SRX2454417 SRR5137006
HV03 TRA SRX2454426 SRR5137015
HV03 TRB SRX2454449 SRR5137038
HV04 TRA SRX2454433 SRR5137022
HV04 TRB SRX2454448 SRR5137037
HV07 TRA SRX2454440 SRR5137029
HV07 TRB SRX2454406 SRR5136995
HV08 TRA SRX2454414 SRR5137003
HV08 TRB SRX2454434 SRR5137023
HV09 TRA SRX2454431 SRR5137020
HV09 TRB SRX2454415 SRR5137004
HV10 TRA SRX2454412 SRR5137001
HV10 TRB SRX2454459 SRR5137048
HV11 TRA SRX2454402 SRR5136991
HV11 TRB SRX2454444 SRR5137033
HV13 TRA SRX2454410 SRR5136999
HV13 TRB SRX2454442 SRR5137031
HV15 TRA SRX11859184 SRR15561076
HV15 TRB SRX11859192 SRR15561068
HV16 TRA SRX11859185 SRR15561075
HV16 TRB SRX11859193 SRR15561067
HV17 TRA SRX11859188 SRR15561072
HV17 TRB SRX11859194 SRR15561066
HV18 TRA SRX11859189 SRR15561071
HV18 TRB SRX11859195 SRR15561065
HV19 TRA SRX11859190 SRR15561070
HV19 TRB SRX11859186 SRR15561074
HV20 TRA SRX11859191 SRR15561069
HV20 TRB SRX11859187 SRR15561073

Other scripts used

Note that the most up-to-date versions of these scripts are downloaded using git.

immunoseq2airr

autoDCR

  • v0.1.0
  • Annotates recombined TCR sequences.
    • Inspired by the core functionality of Decombinator (the TCR analysis software used in the above linked Chain group TCRseq studies).
    • Works off a similar conceptual framework (using Aho-Corasick tries to search for 'tag' sequences linked to V/J genes).
    • Sacrifices the speed of Decombinator to allow for maximum-resolution allele level distinction across the length of a read. Given a FASTA of all V and J genes for a set of TRA/TRB loci, overlapping tags are generated across the entirety of all genes, and V/J genes used determined based on the maximum number of uniquely identifying tags, rather than the specific discovery of single manually-defined tags which uniquely identify a given gene proximal to the CDR3. This approach not only allows for greater inferences about CDR3-distal features, but automating tag (hence 'autoDCR') production makes the process more robust to the discovery of novel alleles.
    • Original paper DOI: 10.1093/bioinformatics/btt004
    • Recent update DOI: 10.1093/bioinformatics/btaa758
    • Repo: github.com/JamieHeather/autoDCR

Running the analysis

Upon cloning this repo, there should be the following directories:

  • Data/
    • Contains the raw VDJdb, Emerson, and immuneSIM data files.
  • Outputs/
    • Empty; results produced by running the analysis will go here.
  • Scripts/
    • Contains the various Python scripts to gather/generate/analyse/plot the data.

Scripts then need to be executed in the following order:

  • preparation.py

    • This downloads the Heather et al. raw data from SRA, and converts the raw data from all data sources into a suitable format for processing with thimble, the high-throughput wrapper for stitchr.
    • Note that this must be run in a bash (or similar) environment, with fastq-dump from sra-tools installed
    • This script also uses git to download both the stitchr files, and the other required supplementary scripts described above.

  • stitching.py

    • This submits the thimble format files generated above for processing.
    • It also repeatedly subsamples the third party datasets (VDJdb/Emerson) to generate a dynamic range of filesizes for benchmarking thimble's speed.

  • plotting.py

    • This reads in the stitched data and run metrics to produce the bulk of the plots that relate to the performance of stitchr and thimble

  • alleles.py

    • This automates a rudimentary novel allele detection process on the Heather et al. TCRseq data, using additional information available from the output of autoDCR.

  • replotting.py

    • This uses the various functions established in stitching.py and plotting.py to repeat the analysis and plotting of the Heather et al. data using the IMGT germline TCR gene reference supplemented with potential novel alleles detected by alleles.py.

  • flowplotting.py

    • This simply uses the processed flow cytometry data contained in the Data/TCR-Jurkat-flow-data.tsv file to plot the TCR+ Jurkat cell activation data, as shown in Figure 2C.
    • It can be run on its own, as it doesn't use the output of any of the other scripts in the repo.

Scripts need to be executed from inside the Scripts directory, as relative paths to there are used throughout. Everything needs to be run in Python3, and has been tested on >= 3.6.9. (Note that the functions.py script should not be directly executed, as it simply contains objects used by the other three scripts.)

Stitchr commands

These are the stitchr commands used for the low-throughput demonstrations of the stitchr tool in the manuscript describing its use.

Figure 1

As featured in Figure 1F, these are the three commands that produce the sequences featured in Figure 1B-D. Note that as these are human TCRs the species flag does not need to be set:

# AA
python3 stitchr.py -v TRBV7-6 -j TRBJ1-4 -cdr3 CASSSGQGLGEKLFF

# NT
python3 stitchr.py -v TRBV7-6 -j TRBJ1-4 -cdr3 TGTGCCAGCAGTTCCGGACAGGGCTTGGGAGAAAAACTGTTTTTT

# SL-NT
python3 stitchr.py -v TRBV7-6 -j TRBJ1-4 -cdr3 tcgcTGTGCCAGCAGTTCCGGACAGGGCTTGGGAGAAAAACTGTTTTTTggca -sl

Figure 2

These commands produce the TCRs described in Supplementary Table 2/aligned to their PDB FASTA origins in Figure 2A/B, plus the additional TCR that was also experimentally validated in Figure 2C:

python3 stitchr.py -n C1-28_TRA -v TRAV8-3*01 -j TRAJ28*01 -cdr3 CAVGAPSGAGSYQLTF -l ATG 
python3 stitchr.py -n KFJ5_TRA -v TRAV4*01 -j TRAJ21*01 -cdr3 CLVGEILDNFNKFYF -l ATG 
python3 stitchr.py -n MAG-IC3_TRA -v TRAV21*02 -j TRAJ28*01 -cdr3 CAVRPGGAGPFFVVF -l ATG 
python3 stitchr.py -n D2H_TRA -v TRAV9-2*01 -j TRAJ37*01 -cdr3 CALDSGNTGKLIF -l ATG 
python3 stitchr.py -n LC13_TRA -v TRAV26-2*01 -j TRAJ52*01 -cdr3 CILPLAGGTSYGKLTF -l ATG 
python3 stitchr.py -n C1-28_TRB -v TRBV4-1*01 -j TRBJ2-7*01 -cdr3 CASSPTSGIYEQYF -l ATG 
python3 stitchr.py -n KFJ5_TRB -v TRBV28*01 -j TRBJ2-3*01 -cdr3 CASSQRQEGDTQYF -l ATG 
python3 stitchr.py -n MAG-IC3_TRB -v TRBV5-1*01 -j TRBJ2-7*01 -cdr3 CASSFNMATGQYF -l ATG 
python3 stitchr.py -n D2H_TRB -v TRBV11-2*01 -j TRBJ2-7*01 -cdr3 CASTTGGGGYEQYF -l ATG 
python3 stitchr.py -n LC13_TRB -v TRBV7-8*01 -j TRBJ2-7*01 -cdr3 CASSLGQAYEQYF -l ATG 
python3 stitchr.py -n modMAG-IC3_TRA -v TRAV21*02_mag-ic3 -j TRAJ28*01 -cdr3 CAVRPGGAGPFFVVF -l ATG -xg

Note that the last command which calls for a modified TRAV21 gene requires the following FASTA read to be added to the Data/additional-genes.fasta in the stitchr directory:

>X58736|TRAV21*02_mag-ic3|Homo sapiens|F|V-REGION|128..400|273 nt|1| | | | ||| |~VARIABLE
aaacaggaggtgacacagattcctgcagctctgagtgtcccagaaggagaaaacttggtt
ctcaactgcagtttcactgatagcgctatttacaacctccagtggtttaggcaggaccct
gggaaaggtctcacatctctgttgTACGTGAGACCCTACcagagagagcaaacaagtgga
agacttaatgcctcgctggataaatcatcaggacgtagtactttatacattgcagcttct
cagcctggtgactcagccacctacctctgtgct

Supplementary Figure 2

These commands produce the TCRs demonstrating stitchr's utility across all TCR loci, for all species for which IMGT currently has sufficient data. Note that constant regions have to be explicitly set for all non-human/non-mouse species (as these are hard-coded into stitchr for human and mice based on our expertise, and cannot be automatically inferred for any arbitrary species):

# 2A
# Human g/d
python3 stitchr.py -v TRGV5*01 -j TRGJ1*02 -cdr3 CATWAPNYYKKLF -c TRGC1*01 -s HUMAN -n Y00482
python3 stitchr.py -v TRDV2*03 -j TRDJ1*01 -cdr3 CACDTLRTGGRLYTDKLIF -c TRDC*01 -s HUMAN -n X14547

# 2B
# Camel
python3 stitchr.py -v TRBV26*01 -j TRBJ3-3*01 -cdr3 CASSESSYSGGISTDPLYF -c TRBC1*01 -s DROMEDARY -n LT837999
python3 stitchr.py -v TRGV2*01 -j TRGJ2-2*01 -cdr3 CAAWETNKIF -c TRGC2*01_ABC -s DROMEDARY -n JF792665

# Cat
python3 stitchr.py -v TRGV2-2*01 -j TRGJ2-2*01 -cdr3 CAAWEARKVGYGWAHKVF -c TRGC2*01_AB -s CAT -n AM746386

# Cow 
# (note the use of a related gene's TRDV leader, as TRDV1S56 doesn't currently have a leader available in IMGT)
python3 stitchr.py -v TRGV1-1*03 -j TRGJ4-2*01 -cdr3 CAVWGPRNYKKNF -c TRGC4*02_ABC -s COW -n D16131
python3 stitchr.py -v TRDV1S56*01 -j TRDJ4*01 -cdr3 CALWKLPVGFTVGYNPLIF -c TRDC*01 -s COW -l TRDV1S5*01 -n D16113

# Dog
python3 stitchr.py -v TRAV9-6*01 -j TRAJ42*01 -cdr3 CALRDRGYYGGSQGRLIF -c TRAC*01 -s DOG -n M97511
python3 stitchr.py -v TRBV20*01 -j TRBJ2-6*01 -cdr3 CGYLQGARYEQYF -c TRBC2*01 -s DOG -n M97510
python3 stitchr.py -v TRGV2-1*01 -j TRGJ3-2*01 -cdr3 CAAWEALRHGWYNKVL -c TRGC3*01_A -s DOG -n AF079123

# Dolphin
python3 stitchr.py -v TRAV16*01 -j TRAJ54*01 -cdr3 CALGDLSLGSAGQKLVF -c TRAC*01 -s DOLPHIN -n LN610706
python3 stitchr.py -v TRGV1*01 -j TRGJ2*01 -cdr3 CALWERLTHGKSVKVF -c TRGC*01 -s DOLPHIN -n HG328287

# Mouse
python3 stitchr.py -v TRAV13-1*01 -j TRAJ48*01 -cdr3 CAMNYGNEKITF -c TRAC*01 -s MOUSE -n FJ188407
python3 stitchr.py -v TRBV20*01 -j TRBJ2-7*01  -cdr3 CGARRDWGSSYEQYF -c TRBC2*01 -s MOUSE -n Y17474
python3 stitchr.py -v TRGV1*05 -j TRGJ4*01 -cdr3 CAVWISTSWVKIF -c TRGC4*01_AB -s MOUSE -n U07554
python3 stitchr.py -v TRDV4*01 -j TRDJ2*01 -cdr3 SDIGGSSWDTRQMFF -c TRDC*01 -s MOUSE -n M26449

# Macaque
python3 stitchr.py -v TRAV2*01 -j TRAJ36*01 -cdr3 CAVRGGVNNLFF -c TRAC*01 -s RHESUS_MONKEY -n M87324
python3 stitchr.py -v TRBV23-1*01 -j TRBJ2-3*01 -cdr3 CANKAEQAPRSPQYF -c TRBC2*01 -s RHESUS_MONKEY -n M87323

# Pig
python3 stitchr.py -v TRBV15*01 -j TRBJ3-3*01 -cdr3 CASSRGGTASTDPLYF -c TRBC3*01 -s PIG -n KF688960

# Rabbit
python3 stitchr.py -v TRGV1-1*03 -j TRGJ1*01 -cdr3 CAVWTKTQNVWIKIF -c TRGC*01_AB -s RABBIT -n D38134

# Sheep
python3 stitchr.py -v TRDV1-65*01 -j TRDJ4*01 -cdr3 CALSVPYAGVWGITDGIQNPLIF -c TRDC*01 -s SHEEP -n AJ005905

Supplementary Figure 3

These examples illustrate how stitchr can be applied to immunoglobulin loci, taking the different human loci/classes as examples. However due to somatic hypermutation and a relatively greater level of allelic polymorphism users must take care, as annotated germline genes will often not reflect the sequence they are aiming to replicate:

# Heavy chains
python3 stitchr.py -v IGHV3-30-3*01 -j IGHJ4*02 -cdr3 CARLSPAGGFFDYW -c IGHM*01 -s HUMAN -n JQ304252
python3 stitchr.py -v IGHV4-61*01 -j IGHJ3*02 -cdr3 CARITGDRGAFDIW -c IGHD*01 -s HUMAN -n AF262208
python3 stitchr.py -v IGHV1-69*01 -j IGHJ3*02 -cdr3 CAREVVPTFRENAFDIW -c IGHG1*01 -s HUMAN -n MW177368
python3 stitchr.py -v IGHV4-59*01 -j IGHJ5*02 -cdr3 CARGISWFDPW -c IGHE*01 -s HUMAN -n DQ005305

# Light chains
python3 stitchr.py -v IGKV3-20*01 -j IGKJ5*01 -cdr3 CQQYGTSRPITF -c IGKC*01 -s HUMAN -n BC032451
python3 stitchr.py -v IGLV1-47*01 -j IGLJ3*02 -cdr3 CAAWDDSLSGWVF -c IGLC2*01 -s HUMAN -l IGLV1-47*02 -n AB064224

Supplementary Figure 4

These commands show an example illustration of how to use stitchr to perform rational TCR engineering. In this case, the DMF5 TCR's beta chain was produced spliced onto multiple different constant regions, added via use of the extra gene option (-xg), having added the relevant sequences to the Data/additional-genes.fasta file (which are supplied with stitchr by default):

python3 stitchr.py -n DMF5-wt -v TRBV6-4 -j TRBJ1-1 -cdr3 CASSLSFGTEAFF  
python3 stitchr.py -n DMF5-TRAC -v TRBV6-4 -j TRBJ1-1 -cdr3 CASSLSFGTEAFF -c hTRAC -xg
python3 stitchr.py -n DMF5-mTRBC1 -v TRBV6-4 -j TRBJ1-1 -cdr3 CASSLSFGTEAFF -c mTRBC1 -xg
python3 stitchr.py -n DMF5-TRDC -v TRBV6-4 -j TRBJ1-1 -cdr3 CASSLSFGTEAFF -c hTRDC -xg
python3 stitchr.py -n DMF5-TRGC1 -v TRBV6-4 -j TRBJ1-1 -cdr3 CASSLSFGTEAFF -c hTRGC1 -xg

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Analysis underlying the manuscript describing Stitchr, the Python tool for generating full-length TCR sequences

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