Proteomics
Proteomics is the large-scale study of the entire complement of proteins (the proteome) expressed by a genome, cell, tissue, or organism at a given time and under specific conditions. Unlike the static genome, the proteome is highly dynamic — proteins vary in abundance, post-translational modifications (PTMs), localisation, and interactions in response to cellular state and environment. Mass spectrometry combined with two-dimensional gel electrophoresis or liquid chromatography is the primary technology platform used to identify, quantify, and characterise proteins at a systems level.
Comparison of Genomics, Transcriptomics, and Proteomics
| Omics Level | Molecule Studied | Key Technology | Dynamic? | Encodes Function Directly? |
|---|---|---|---|---|
| Genomics | DNA | Next-generation sequencing | No (mostly static) | No |
| Transcriptomics | mRNA | RNA-seq, microarray | Yes | Partially |
| Proteomics | Proteins | Mass spectrometry | Yes (highly) | Yes |
| Metabolomics | Small molecules | NMR, LC-MS | Yes (very rapidly) | Yes (functional output) |
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Related Terms
Protein Folding
Protein folding is the physical process by which a linear polypeptide chain acquires its unique three-dimensional functional conformation, driven primarily by the hydrophobic effect, hydrogen bonding, electrostatic interactions, and van der Waals forces. The native folded state represents the lowest free-energy conformation under physiological conditions, as proposed by Christian Anfinsen's thermodynamic hypothesis (1972). Misfolding is linked to diseases such as Alzheimer's, Parkinson's, and prion diseases; understanding folding is therefore critical for drug design and therapeutic protein engineering.
Metabolomics
Metabolomics is the systematic, large-scale study of small-molecule metabolites (< ~1500 Da) — such as amino acids, lipids, sugars, and organic acids — present in a biological sample, reflecting the downstream functional output of genomic, transcriptomic, and proteomic changes. Nuclear magnetic resonance (NMR) spectroscopy and mass spectrometry (MS) coupled to chromatography are the primary analytical platforms, capable of detecting hundreds to thousands of metabolites simultaneously. Metabolomics is applied in biomarker discovery, drug toxicology, nutritional science, and understanding metabolic diseases such as type 2 diabetes.
Bioinformatics
Bioinformatics is an interdisciplinary field that develops and applies computational methods, algorithms, and software tools to analyse and interpret large-scale biological data, particularly sequences of DNA, RNA, and proteins. It integrates biology, computer science, mathematics, and statistics to address problems such as genome assembly, sequence alignment, phylogenetic analysis, and structural prediction. The field is indispensable for modern genomics, drug discovery, and personalised medicine.
From Greek "proteios" (primary) + "-omics" (large-scale study). The term "proteome" was coined by Marc Wilkins in 1994 and first published in 1995 to describe the entire protein complement of a genome.