Gene Expression Profiling in Osteoarthritis Mechanisms

Gene expression profiling using bulk and single-cell transcriptomic techniques has transformed our understanding of osteoarthritis (OA) by depicting the dynamic molecular changes in cartilage, synovium and subchondral bone. These approaches have delineated the cellular heterogeneity of chondrocytes, revealed pathological pathways driving cartilage degradation, fibrosis and inflammation, and identified candidate biomarkers and therapeutic targets. High-resolution atlases of gene activity now illustrate how mechanical stress, inflammatory cytokines and epigenetic regulation converge on key mediators such as matrix metalloproteinases, pro-fibrotic collagens and signalling molecules. Integrative analyses combining spatial transcriptomics and genome-wide association data are refining patient stratification and underpinning precision medicine strategies to slow or reverse joint degeneration.

Research from Nature Portfolio

Recent studies have shown that loss of the RNA helicase DDX5 exacerbates hyaline cartilage fibrosis and degradation in OA. Downregulation of DDX5 in chondrocytes promotes alternative splicing events and stabilises G-quadruplex structures in key promoter regions, leading to increased expression of fibrosis-related genes (Col1, Acta2) and matrix-degrading enzymes (Mmp13, Nos2). In mouse models, chondrocyte-specific deletion of Ddx5 intensified cartilage lesions, highlighting DDX5 upregulation as a promising therapeutic strategy. A complementary investigation using single-cell RNA sequencing of matched synovial and cartilage tissues mapped intercellular cytokine–growth factor networks. Distinct synoviocyte subsets were found to produce pathogenic mediators, including interleukin-1β and MIF, which engage chondrocyte receptors and shape articular homeostasis versus degeneration.

Gene Expression Profiling in Osteoarthritis Mechanisms publication trend

The graph below shows the total number of articles in gene expression profiling in osteoarthritis mechanisms across all publications each year (not limited to Nature Index journals).

Technical terms

Chondrocyte: The principal cell type in articular cartilage responsible for maintaining and remodelling the extracellular matrix.

Single-cell RNA sequencing: A high-resolution method to quantify the transcriptome of individual cells, revealing cellular heterogeneity.

Spatial transcriptomics: A technique that maps gene expression profiles to precise tissue locations, preserving architectural context.

G-quadruplex: A four-stranded nucleic acid structure that can regulate gene transcription and stability.

Fibrosis: The pathological accumulation of fibrous connective tissue, often marked by excessive type I collagen deposition.

References

1. DDX5 inhibits hyaline cartilage fibrosis and degradation in osteoarthritis via alternative splicing and G-quadruplex unwinding. Nature Aging (2024).
2. Unveiling inflammatory and prehypertrophic cell populations as key contributors to knee cartilage degeneration in osteoarthritis using multi-omics data integration. Annals of the Rheumatic Diseases (2024).
3. Single-cell transcriptomic analysis of chondrocytes in cartilage and pathogenesis of osteoarthritis. Genes & Diseases (2024).