Genetic Factors in Shoulder Impingement Risk: COL5A1 and MMP3

Last reviewed: May 12, 2026 Last updated: May 12, 2026

Written by: Jay Hastings , CEO of PlexusDx

Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations. He has more than 20 years of experience across healthcare innovation, genomics, laboratory operations, healthcare investing, and strategic finance. His work has included scaling healthcare startups, leading CLIA lab integrations, and helping expand consumer access to precision health tools.

Medically reviewed by: Jayden Lee, PharmD, EMBA

Jayden Lee, PharmD, EMBA, is the PlexusDx Medical Science Liaison with a PharmD and MBA specializing in pharmacogenomics and clinical product development, with a proven ability to bridge the gap between genomic research and practical patient outcomes. Dr. Lee has more than 10 years of professional experience in clinical pharmacy, academia, and research.

This article is part of the PlexusDx Education Hub — your resource for evidence-based guidance on Genetics & Musculoskeletal Health. Browse all Genetics & Musculoskeletal Health education

Shoulder impingement — pain when the rotator cuff tendons are compressed under the acromion — is often blamed entirely on posture, overuse, or anatomy. Those matter, but they do not explain why two people with identical training loads can have very different tendon health. Part of the answer is written in connective-tissue genetics. Your tendons are built and repaired according to genetic instructions, and common variants in collagen and matrix genes influence how strong, stiff, and repair-ready that tissue is. Understanding this will not treat an injury, but it clarifies why some shoulders are more vulnerable.

What shoulder impingement is and where genes fit

Shoulder impingement, also called subacromial pain syndrome, involves irritation of the rotator cuff tendons and the bursa in the narrow space beneath the acromion. Repetitive overhead motion is the classic trigger, but tendon quality determines how well the tissue tolerates that load. Tendons are largely collagen, and the genes that encode and remodel collagen vary meaningfully between people.

Research on tendinopathy and rotator cuff disease has repeatedly found that inherited connective-tissue variation contributes to risk — a genetic layer sitting underneath the mechanical and lifestyle factors clinicians usually address.

COL5A1: the collagen gene behind tendon quality

COL5A1 encodes part of type V collagen, which regulates the assembly and diameter of type I collagen fibrils — the main structural protein in tendon. The COL5A1 variant rs12722 is one of the most studied markers in sports genetics and has been associated with tendon and ligament injury risk across multiple populations. Different genotypes appear to influence tendon stiffness and how the tissue responds to repetitive loading.

Family studies reinforce this: a personal or family history of rotator cuff tears is itself a recognized risk factor, consistent with a heritable connective-tissue component.

MMP3, TNC, and the tissue-remodeling pathway

Tendon health is not just about building collagen — it is about remodeling it. MMP3 (a matrix metalloproteinase) helps break down and turn over the extracellular matrix, and variants in MMP genes have been linked to tendinopathy. TNC, which encodes tenascin-C, a protein that increases at sites of tendon stress and repair, has also been associated with tendon injury. Together these genes describe a remodeling pathway that determines how efficiently a shoulder recovers from micro-damage.

How genetics interacts with load and posture

Genetic predisposition sets a baseline; behavior determines whether it is expressed. An overhead athlete or manual worker places far more repetitive stress on the rotator cuff than a sedentary person, so the same COL5A1 or MMP3 genotype can play out very differently depending on activity. This interaction is why prevention is individual: understanding your connective-tissue tendencies can inform how aggressively you warm up, progress load, and build rotator cuff strength.

Turning genetic insight into action

The PlexusDx Precision Peptide Genetic Test analyzes 14 pathways, 49 peptides, 150+ genetic insights, including pathways tied to tissue repair, recovery, and inflammation — the biology that underlies tendon resilience. This is educational context about your predispositions, not a diagnosis of shoulder impingement and not a treatment plan. It cannot tell you whether a specific therapy will work.

The evidence-based levers for shoulder health remain the same regardless of genotype: progressive rotator cuff and scapular strengthening, sensible load management, and prompt evaluation of persistent pain by a physical therapist or physician. Genetic insight simply helps you understand why your shoulder behaves the way it does.

Frequently Asked Questions

Can genetics cause shoulder impingement?

Genetics does not directly cause impingement, but it influences tendon quality and repair capacity. Variants in connective-tissue genes such as COL5A1, MMP3, and TNC shape how well rotator cuff tendons tolerate repetitive load, interacting with posture, activity, and age to affect overall risk.

What is the COL5A1 gene's role in tendon injury?

COL5A1 encodes type V collagen, which controls how type I collagen fibrils assemble in tendon. The rs12722 variant has been associated with tendon and ligament injury risk in multiple studies, likely by influencing tendon stiffness and the tissue's response to repetitive mechanical stress.

Does a genetic test replace a doctor's diagnosis?

No. Shoulder impingement is diagnosed clinically through examination and imaging, not DNA. Genetic testing offers pathway-level context about connective-tissue and repair tendencies. Any persistent shoulder pain should be evaluated by a physician or physical therapist for proper diagnosis and care.

Can I strengthen tendons if I carry risk variants?

Yes. You cannot change your genes, but tendon health responds strongly to training. Progressive rotator cuff and scapular strengthening, gradual load increases, and good movement mechanics all improve resilience — provider-guided steps that address the mechanical side of impingement risk.

Want to see how your tissue-repair and recovery pathways fit your training? Take the Precision Peptide Genetic Test to understand your genetic pathway context, then bring that insight to a conversation with your provider.

This article is part of the PlexusDx Education Hub. Browse all Genetics & Musculoskeletal Health education

The Precision Peptide Genetic Test analyzes how your genes influence peptide-related biological pathways. It does not recommend, prescribe, diagnose, or determine which peptides or treatments you should use. Consult a qualified healthcare provider before making decisions about your health or beginning any peptide protocol.

Medical and Editorial Standards

Medical review process: This article was reviewed for medical accuracy, scientific clarity, evidence alignment, and appropriate discussion of genetics, medications, supplements, biomarkers, and health-related claims.

Sources and evidence: PlexusDx educational content is developed using peer-reviewed research, clinical literature, reputable medical references, and, where applicable, public health or regulatory guidance. References are included at the end of the article when scientific, medical, or health-related claims are discussed.

Commercial transparency: PlexusDx offers genetic testing, blood biomarker testing, personalized supplement recommendations, and related precision wellness services. Product mentions are intended to help readers understand available options and should not be interpreted as medical advice.

Important disclaimer: PlexusDx educational content is for informational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about medications, supplements, genetic testing, lab testing, or health-related care.