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Shotgun proteomics aids discovery of novel protein-coding genes, alternative splicing, and “resurrected” pseudogenes in the mouse genome
Open accessAbstract
Recent advances in proteomic mass spectrometry (MS) offer the chance to marry high-throughput peptide sequencing to transcript models, allowing the validation, refinement, and identification of new protein-coding loci. We present a novel pipeline that integrates highly sensitive and statistically robust peptide spectrum matching with genome-wide protein-coding predictions to perform large-scale gene validation and discovery in the mouse genome for the first time. In searching an excess of 10 million spectra, we have been able to validate 32%, 17%, and 7% of all protein-coding genes, exons, and splice boundaries, respectively. Moreover, we present strong evidence for the identification of multiple alternatively spliced translations from 53 genes and have uncovered 10 entirely novel protein-coding genes, which are not covered in any mouse annotation data sources. One such novel protein-coding gene is a fusion protein that spans the Ins2 and Igf2 loci to produce a transcript encoding the insulin II and the insulin-like growth factor 2–derived peptides. We also report nine processed pseudogenes that have unique peptide hits, demonstrating, for the first time, that they are not just transcribed but are translated and are therefore resurrected into new coding loci. This work not only highlights an important utility for MS data in genome annotation but also provides unique insights into the gene structure and propagation in the mouse genome. All these data have been subsequently used to improve the publicly available mouse annotation available in both the Vega and Ensembl genome browsers (http://vega.sanger.ac.uk).
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“Initial efforts to assess the contribution of alternative splicing to proteomic composition and diversity have focused exclusively on the identification of proteins derived from alternatively spliced transcripts in a steady-state system (Blakeley et al., 2010, Brosch et al., 2011, Ezkurdia et al., 2012, Lander et al., 2001, Leoni et al., 2011, Tress et al., 2008, Xing et al., 2011, Zhou et al., 2”
From Impact of Alternative Splicing on the Human Proteome (2017) · cites this paper as Brosch et al., 2011
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Metadata
- Authors
- Brosch, M., Saunders, G. I., Frankish, A., Collins, M. O., Yu, L., Wright, J., Verstraten, R., Adams, D. J., Harrow, J., Choudhary, J. S., & Hubbard, T.
- Affiliations
- Wellcome Sanger Institute (GB)
- ORCID
- Venue
- Genome Research
- Publisher
- Cold Spring Harbor Laboratory
- Published
- 2011-04-01
- Volume
- 21
- Issue
- 5
- Pages
- 756-767
- ISSN
- 1088-9051 (ISSN-L)
- PMC
- PMC3083093
- OpenAlex
- W1997509288
- Cited by
- 130
- References
- 77
- Citations by year
- 2026: 2 · 2025: 2 · 2024: 3 · 2023: 5 · 2022: 2 · 2021: 9 · 2020: 3 · 2019: 8 · 2018: 4 · 2017: 14 · 2016: 9 · 2015: 21 · 2014: 19 · 2013: 11 · 2012: 13
- Type
- posted content
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- other-oa
- Locations
- Genome Research (publishedVersion, other-oa)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Research Portal (King's College London) (publishedVersion, other-oa)
- HighWire Press Open Archive (submittedVersion)
- Funders
- Wellcome Trust (077198)
- Cancer Research UK (13031)
- Topics
- Physical Sciences › Chemistry › Spectroscopy › Advanced Proteomics Techniques and Applications
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bioinformatics and Genomic Networks
- Keywords
- shotgun proteomics, peptide-spectrum matching, novel protein-coding genes, alternative splicing, processed pseudogenes, gene validation, insulin-like growth factor II, genome annotation pipeline
- MeSH terms
- Animals, Genes, Peptides, Pseudogenes, Genome, Alternative Splicing, Genomics, Proteomics, Mice, Tandem Mass Spectrometry
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