Proteomics

Dataset Information

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Large-Scale Immuno-Peptidome Analysis Reveals Recurrent Post-Translational Splicing of Cancer and Immune-Associated Genes


ABSTRACT: Post translational spliced peptides bound to the HLA are unique type of peptides, shown in cancer, for HLA-class-I. Thus far, no consensus has been reached on the extent to which post-translational spliced peptides (PTSPs) occur, stirring significant debate. Furthermore, the role of the HLA-class-II pathway has been studied only in diabetes. Here, we exploit our large-scale cancer peptidomics database and devise a pipeline to filter spliced peptide predictions, to identify recurring spliced peptides, both for HLA-class-I and -II. Our results indicate that HLA-Class-I spliced peptides account for a low percentage (4.4%) of the immunopeptidome, yet are larger in number relative to other types of identified aberrant peptides. Therefore, spliced peptides contribute significantly to the repertoire of presented peptides in cancer cells. In addition, HLA-class-II bound spliced peptides were identified as well, but to a lower extent (0.6%).

INSTRUMENT(S): Q Exactive

ORGANISM(S): Homo Sapiens (human) Mus Musculus (mouse)

TISSUE(S): Tissue, Breast, Head And Neck Squamous Cell Carcinoma Cell Line, Skin, Breast Cancer Cell Line

DISEASE(S): Melanoma,Head And Neck Squamous Cell Carcinoma

SUBMITTER: Ronen Levy  

LAB HEAD: Yardena Samuels

PROVIDER: PXD034788 | Pride | 2023-05-10

REPOSITORIES: Pride

Dataset's files

Source:
Action DRS
108T_EV1.raw Raw
108T_EV2.raw Raw
108T_EV3.raw Raw
108T_IFN1.raw Raw
108T_IFN2.raw Raw
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Publications

Large-Scale Immunopeptidome Analysis Reveals Recurrent Posttranslational Splicing of Cancer- and Immune-Associated Genes.

Levy Ronen R   Alter Regev Tal T   Paes Wayne W   Gumpert Nofar N   Cohen Shvefel Sapir S   Bartok Osnat O   Dayan-Rubinov Maria M   Alon Michal M   Shmueli Merav D MD   Levin Yishai Y   Merbl Yifat Y   Ternette Nicola N   Samuels Yardena Y  

Molecular & cellular proteomics : MCP 20230223 4


Posttranslational spliced peptides (PTSPs) are a unique class of peptides that have been found to be presented by HLA class-I molecules in cancer. Thus far, no consensus has been reached on the proportion of PTSPs in the immunopeptidome, with estimates ranging from 2% to as high as 45% and stirring significant debate. Furthermore, the role of the HLA class-II pathway in PTSP presentation has been studied only in diabetes. Here, we exploit our large-scale cancer peptidomics database and our newly  ...[more]

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