Abstract: Non-coding RNAs (ncRNAs) play a role in the pathogenesis of osteoarthritis (OA) by regulating gene expression related to inflammation, chondrocyte apoptosis, and extracellular matrix degradation. In horses, OA is a leading cause of lameness and poor performance, with no current treatments halting disease progression and no clear biomarker available. Although some studies have investigated expression profiles of ncRNAs in equine OA, there is a need to systematically review previous efforts and synthesize information to identify potential ncRNAs to target in future research. Unassigned: The search strategy was developed using the Population, Intervention, Comparison, Outcome, Studies (PICOS) framework. A comprehensive search of Scopus, ScienceDirect, CAB Abstracts, BIOSIS Previews, and Web of Science Core Collection identified studies written in English published through June 30, 2025, using comprehensive terms for ncRNAs in equine osteoarthritis. Eligible studies assessed differential ncRNAs expression profiles in natural and experimentally induced OA and control equids. Individual ncRNAs were categorized based on frequency across different studies: 1) identified in three or more samples across studies, 2) identified in two samples across studies or 3) unique to one sample in a single study. Differential expression (logfold change) with -values were extracted for each ncRNA and visualized using heatmaps. Unassigned: Eight studies met the inclusion criteria, including four longitudinal and four case-control studies. Three investigated natural OA, four analyzed surgically induced OA and one employed a chemically induced OA model. Most studies utilized next-generation sequencing (NGS) to analyze ncRNAs, while two used quantitative polymerase chain reaction (qPCR). Three NGS studies included PCR validation. Multiple ncRNAs were identified, with microRNAs (miRNAs) being the most frequently found, followed by small nucleolar RNAs (snoRNAs). Among ncRNAs reported in at least three types of samples across independent studies, let-7a, miR-1307, miR-144, miR-744, and miR-98 were significantly upregulated, whereas miR-10a and miR-29b were significantly downregulated ( < 0.05). Unassigned: Our findings of specific ncRNAs with shared expression profiles across multiple equine OA studies support their potential as OA biomarkers. Further research is necessary to determine the role of ncRNAs in OA development, such as contributions to cartilage degeneration, inflammation, and apoptosis, and to evaluate their potential as therapeutic targets.
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Overview
This research article systematically reviews the expression profiles of non-coding RNAs (ncRNAs) associated with osteoarthritis (OA) in horses, aiming to identify consistent ncRNA biomarkers and therapeutic targets for equine OA.
The review synthesizes data from multiple studies to reveal which ncRNAs are commonly dysregulated in equine OA, highlighting their potential involvement in disease mechanisms.
Background
Osteoarthritis (OA) is a degenerative joint disease characterized by inflammation, chondrocyte (cartilage cell) death, and breakdown of the extracellular matrix, leading to joint dysfunction.
In horses, OA is a major cause of lameness and reduced athletic performance, with no current treatments that effectively stop its progression.
Non-coding RNAs (ncRNAs) are RNA molecules that do not code for proteins but regulate gene expression and have been implicated in the pathogenesis of OA by influencing inflammation, cell apoptosis, and cartilage degradation.
Identifying specific ncRNAs consistently involved in equine OA could aid in biomarker development for diagnosis or monitoring, as well as reveal new therapeutic targets.
Previous studies on ncRNA expression in equine OA exist, but there has been no systematic synthesis of this data to determine the most promising ncRNAs related to the disease.
Research Aim and Methodology
The review aimed to comprehensively identify and analyze studies that examined differential expression of ncRNAs in equine OA.
A systematic search was performed across multiple databases (Scopus, ScienceDirect, CAB Abstracts, BIOSIS Previews, Web of Science Core Collection) for English-language studies published up to June 30, 2025.
The search strategy was based on the PICOS framework (Population, Intervention, Comparison, Outcome, Studies) tailored to ncRNA expression in equine OA.
Included studies investigated natural or experimentally induced OA in horses, comparing affected and control samples for ncRNA expression differences.
Data extraction focused on differential expression values (log fold change) and p-values for each ncRNA identified.
Individual ncRNAs were categorized by how frequently they appeared across independent samples:
Identified in three or more samples across studies
Identified in two samples
Unique to a single sample/study
Key Findings
Eight studies met inclusion criteria, comprising four longitudinal studies and four case-control studies:
Three studies evaluated naturally occurring OA.
Four studied surgically induced OA models.
One used a chemically induced OA model.
The majority of studies used next-generation sequencing (NGS) techniques for broad detection of ncRNAs, while two used targeted quantitative polymerase chain reaction (qPCR) assays for validation.
Among the ncRNAs identified:
MicroRNAs (miRNAs) were the most common type found across studies.
Small nucleolar RNAs (snoRNAs) were also frequently detected.
When focusing on ncRNAs found in three or more independent samples:
miRNAs such as let-7a, miR-1307, miR-144, miR-744, and miR-98 were significantly upregulated in OA.
miR-10a and miR-29b were significantly downregulated in OA samples (p < 0.05).
The review visualized expression patterns using heatmaps to illustrate consistent trends across studies.
Implications and Future Directions
The identification of ncRNAs with consistent dysregulation across multiple studies supports their potential as biomarkers for equine OA.
These ncRNAs may reflect biological processes driving cartilage destruction, inflammatory response, and cell apoptosis in OA.
Further research is needed to:
Elucidate the precise biological roles of these key ncRNAs in equine OA pathogenesis.
Investigate their utility as early diagnostic markers or tools to track disease progression in live animals.
Assess the feasibility of targeting specific ncRNAs therapeutically to slow or halt OA development.
This comprehensive review provides a valuable resource for guiding future functional studies on ncRNAs in equine joint disease.
Cite This Article
APA
Khaliji E, Wong TS, Barker CM, Chen S, Cassano JM.
(2026).
Non-coding RNA profiles associated with equine osteoarthritis: a systematic review.
Front Vet Sci, 13, 1917722.
https://doi.org/10.3389/fvets.2026.1917722
Department of Veterinary Medicine and Epidemiology, Veterinary Institute for Regenerative Cures, Weill School of Veterinary Medicine, University of California, Davis, CA, United States.
Wong, Talia Sonnenschein
Department of Pathology, Microbiology and Immunology, Center for Vector-borne Diseases, Weill School of Veterinary Medicine, University of California, Davis, CA, United States.
Barker, Christopher Michael
Department of Pathology, Microbiology and Immunology, Center for Vector-borne Diseases, Weill School of Veterinary Medicine, University of California, Davis, CA, United States.
Chen, Shuai
Department of Public Health Sciences, School of Medicine, University of California, Davis, CA, United States.
Cassano, Jennifer Michelle
Department of Veterinary Medicine and Epidemiology, Veterinary Institute for Regenerative Cures, Weill School of Veterinary Medicine, University of California, Davis, CA, United States.
Conflict of Interest Statement
The author(s) declared that this work was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
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