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Features

SNV and Indel support

pVACseq offers epitope binding predictions for missense, inframe indel, and frameshift mutations.

VCF support

pVACseq uses a single-sample VCF file as its input. This VCF file must be annotated with VEP. See the Prerequisites for more information.

No local install of epitope prediction software needed

pVACseq utilizes the IEDB RESTful web interface. This means that none of the underlying prediction software, like NetMHC, needs to be installed locally.

Warning

We only recommend using the RESTful API for small requests. If you use the RESTful API to process large VCFs or to make predictions for many alleles, epitope lengths, or prediction algorithms, you might overload their system. This can result in the blacklisting of your IP address by IEDB, causing 403 errors when trying to use the RESTful API. In that case please open a ticket with IEDB support to have your IP address removed from the IEDB blacklist.

Support for local installation of the IEDB Analysis Resources

pVACseq provides the option of using a local installation of the IEDB MHC class I and class II binding prediction tools.

Warning

Using a local IEDB installation is strongly recommended for larger datasets or when the making predictions for many alleles, epitope lengths, or prediction algorithms. More information on how to install IEDB locally can be found on the Installation page.

MHC Class I and Class II predictions

Both MHC Class I and Class II predictions are supported. Simply choose the desired prediction algorithms and HLA alleles during processing and Class I and Class II prediction results will be written to their own respective subdirectories in your output directory.

By using the IEDB RESTful web interface, pVACseq leverages their extensive support of different prediction algorithms.

MHC Class I Prediction Algorithm Version
NetMHCpan 2.8
NetMHC 4.0
NetMHCcons 1.1
PickPocket 1.1
SMM  
SMMPMBEC  
MHC Class II Prediction Algorithm Version
NetMHCIIpan 3.0
SMMalign 1.1
NNalign 2.2

Comprehensive filtering

Automatic filtering on the binding affinity ic50 value narrows down the results to only include “good” candidate peptides. The binding filter threshold can be adjusted by the user for each pVACseq run, and additional filtering can be manually done by the user on the final result file to narrow down the candidate epitopes even further.

bam-readcount and cufflinks files can be provided by the user as additional input files and are used to extract coverage and expression data. When any bam-readcount or cufflinks files are provided, automatic filtering with adjustable thresholds on depth, VAF, and/or expression value will narrow down the results. The user can also manually run the coverage filter to further narrow down their results from the final output file.

The user can also specify an option to only keep the top scoring result for each allele-peptide length combination for each variant.

NetChop and NetMHCstab integration

Cleavage position predictions are added with optional processing through NetChop.

Stability predictions can be added if desired by the user. These predictions are obtained via NetMHCstab.