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Normalized and Directional Interplay Scoring for the Interrogation of Proteoform Data.
Karl F Poncha1, Alyssa T Paparella1, Nicolas L Young1,2
1Verna & Marrs McLean Department of Biochemistry & Molecular Pharmacology, Baylor College of Medicine, Houston Texas.
Biorxiv : the Preprint Server for Biology
|November 28, 2024
Summary
New computational methods reveal histone proteoform dynamics during aging. Novel scores quantify post-translational modification (PTM) crosstalk, offering deeper insights into chromatin regulation and gene expression influenced by histone modifications.
Area of Science:
- Molecular Biology
- Proteomics
- Bioinformatics
Background:
- Histone proteoforms, with multiple co-occurring post-translational modifications (PTMs), are crucial for chromatin regulation and gene expression.
- Understanding histone proteoform dynamics is key to elucidating chromatin-based regulatory mechanisms.
- Proteomics advances allow proteoform identification, but data complexity poses analytical challenges.
Purpose of the Study:
- To introduce novel computational methods for analyzing histone PTM dynamics.
- To develop and benchmark new scores for quantifying PTM crosstalk.
- To apply these methods to study histone modifications in mouse organs during aging.
Main Methods:
- Development of two novel PTM crosstalk scores: 'Normalized Interplay' and 'delta I' (Directional Interplay).
- Benchmarking of the new scores against existing methods.
- Application of a two-stage scoring approach to proteoform-level data from CrosstalkDB.
Main Results:
- The 'Normalized Interplay' score provides a more complete and accurate measure of PTM crosstalk.
- The 'delta I' score quantifies the magnitude and directionality of PTM crosstalk.
- Analysis revealed dynamics of histone H3 modifications in mouse organs during aging.
Conclusions:
- The developed computational methods and scores enhance the analysis of histone PTM dynamics.
- These tools offer a more comprehensive understanding of PTM crosstalk and its role in biological processes like aging.
- The findings contribute to the field of chromatin regulation and proteoform analysis.
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