====== Differential expression of proteins ======
Differential [[expression]] of [[protein]]s refers to the changes in [[protein]] abundance between different biological conditions or [[sample]]s. It is a term commonly used in [[proteomics]] and [[molecular biology]] to describe the proteins that are significantly upregulated or downregulated in one condition compared to another.

The [[identification]] of differentially expressed proteins is often carried out through [[technique]]s such as mass spectrometry-based [[proteomics]] or protein [[microarray]]s. These methods allow [[researcher]]s to quantify the abundance of thousands of proteins simultaneously and compare their levels across different samples.

The analysis of differentially expressed proteins is crucial for understanding various biological processes, including disease mechanisms, [[cellular response]]s to stimuli, and developmental processes. By comparing protein expression profiles between different conditions, researchers can identify potential [[biomarker]]s for diseases, gain insights into protein function and [[signaling pathway]]s, and discover therapeutic targets.

Differential expression analysis typically involves statistical methods to determine which proteins show significant changes in abundance. Commonly used statistical tests include the [[t-test]], analysis of variance ([[ANOVA]]), and more advanced methods like the linear models for microarray data (limma) or the edgeR package.

Once differentially expressed proteins are identified, researchers often perform further analyses to characterize their functions, interactions, and potential roles in biological processes. This may involve functional enrichment analysis, pathway analysis, and integration with other omics data such as genomics or transcriptomics to gain a comprehensive understanding of the underlying biology.

It's important to note that the identification of differentially expressed proteins is only the first step in understanding their significance. Further experimental validation and functional studies are usually necessary to confirm their roles and elucidate their molecular mechanisms in the context of the specific biological system under investigation.