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Related Concept Videos

Proteomics01:33

Proteomics

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A proteome is the entire set of proteins that a cell type produces. We can study proteomes using the knowledge of genomes because genes code for mRNAs, and the mRNAs encode proteins. Although mRNA analysis is a step in the right direction, not all mRNAs are translated into proteins.
Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term...
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Peptide Identification Using Tandem Mass Spectrometry01:33

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Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties.
This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...
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Related Experiment Video

Updated: Oct 17, 2025

Author Spotlight: Advancing Tear Fluid Analysis Using a Standardized Protocol for Proteomics Research
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Single-Tear Proteomics: A Feasible Approach to Precision Medicine.

Erika Ponzini1, Diletta Ami2, Alessandro Duse1

  • 1Materials Science Department, University of Milano-Bicocca, Via R. Cozzi 55, 20125 Milan, Italy.

International Journal of Molecular Sciences
|October 13, 2021
PubMed
Summary

This study developed a method for analyzing single tears using proteomics, identifying 890 proteins. Tear analysis reveals sex-based differences and daily immune system variations, paving the way for precision medicine.

Keywords:
lacrimal filmliquid biopsiesmass-spectrometry-based proteomicsperipheral body fluidspersonalized medicinesingle-tear analysis

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Area of Science:

  • Biochemistry
  • Proteomics
  • Biomarker Discovery

Background:

  • Lacrimal fluid offers potential for noninvasive biomarkers.
  • Limited sample volumes hinder proteomic analysis.
  • Advanced methods are crucial for biomarker development in precision medicine.

Purpose of the Study:

  • To establish an effective analytical pipeline for single-tear proteomics.
  • To identify proteins in microliter tear samples.
  • To explore tear fluid's potential for precision medicine.

Main Methods:

  • Developed an ultrahigh-resolution, shotgun proteomics pipeline.
  • Analyzed single-tear samples from 23 healthy volunteers.
  • Utilized peak intensity, peak area, and spectral counting for quantification.

Main Results:

  • Identified 890 proteins with high confidence.
  • Achieved highly reproducible quantification.
  • Revealed sex-based stratification and diurnal variations in immune system components.

Conclusions:

  • Demonstrated feasibility of single-tear quantitative proteomics.
  • Tear fluid can contribute to individualized biomedical approaches.
  • This method enables novel biomarker discovery from minimal sample volumes.