Top-down characterization of chicken core histones

Area of Science:

• Proteomics
• Epigenetics
• Molecular Biology

Background:

• Core histones and their post-translational modifications (PTMs) are vital for gene transcription and DNA-related processes.
• Understanding histone PTMs, their cross-talk, and functions holds significant biological, pathological, and clinical relevance.
• Top-down proteomics offers comprehensive proteoform identification with complete amino acid sequence coverage for analyzing combinatorial PTMs.

Purpose of the Study:

• To perform a top-down proteomic characterization of chicken core histones.
• To identify and analyze the proteoforms and combinatorial PTMs present in chicken core histones.
• To leverage chicken as a model organism due to its availability and less dense PTMs.

Main Methods:

• Nano liquid chromatography-tandem mass spectrometry (nanoRPLC-MS/MS) was employed for high-resolution analysis.
• ProteinGoggle database searching was utilized for proteoform identification.
• Top-down proteomics approach was applied for comprehensive characterization.

Main Results:

• A total of 58 proteoforms were identified across the core histone families: H4, H2B, H2A, and H3.
• The study provided detailed insights into the combinatorial PTMs of chicken core histones.
• Successful application of top-down proteomics for characterizing histone proteoforms.

Conclusions:

• Top-down proteomics is a powerful tool for characterizing complex histone proteoforms and their PTMs.
• The identified proteoforms provide a foundation for further research into histone function and regulation in chickens.
• This study enhances our understanding of histone modifications in a widely used model organism.