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.

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The rotator cuff — four muscles and their tendons that stabilize the shoulder — is one of the most injury-prone structures in the body. Age, overuse, and biomechanics play obvious roles, but genetics also shapes how strong and resilient your tendons are. Collagen genes in particular help explain why two people with the same training can have very different injury risk.

The Rotator Cuff and Why It Tears

Rotator cuff injuries range from inflammation and tendinopathy to partial and full-thickness tears. Tendons are built largely from collagen, and their strength depends on how that collagen is assembled and maintained. When the balance between tissue breakdown and repair tips the wrong way — through aging, overload, or genetic predisposition — tendons become more vulnerable to injury and slower to heal.

Collagen Genes: COL5A1 and COL1A1

COL5A1 encodes part of type V collagen, which regulates how collagen fibers form. A well-studied variant, rs12722, has been linked in research to tendon and ligament injury risk, including differences in tendon stiffness and flexibility. COL1A1 encodes the main type I collagen of tendons; its Sp1-binding variant (rs1800012) has been associated with altered collagen production and, in some studies, protection against certain soft-tissue injuries. Together, these genes influence the raw material your shoulder tendons are made from.

Beyond Collagen: MMP3, TNC, and GDF5

Collagen genes are not the whole story. Matrix metalloproteinase genes like MMP3 govern tissue remodeling — the constant breakdown and rebuilding of tendon. Variants in TNC (tenascin-C) have been linked to Achilles and other tendon injuries, and GDF5 influences joint and tendon development. Rotator cuff resilience emerges from this whole network rather than any single gene, which is why pathway-level insight is more informative than one marker alone.

What the Research Shows

Sports-genetics studies, including work from South African and other cohorts, have repeatedly associated COL5A1 rs12722 and related collagen variants with tendon and ligament injury risk. Findings on rotator cuff tears specifically point to a familial and genetic component alongside age and load. Effect sizes are modest and populations differ — genetics tilts the odds, it does not seal your fate.

Family studies add weight to the genetic picture: relatives of people with full-thickness rotator cuff tears show a higher rate of tears themselves than the general population, suggesting inherited factors beyond shared activity. Age remains the single largest risk factor, and it interacts with genetics — the same collagen profile may matter more as tissue turnover slows with the decades. That is why prevention is best thought of as lifelong, not a one-time fix.

Genetics and Smart Self-Protection

Knowing you may carry a higher-risk collagen profile is not a reason to avoid activity — it is a reason to train wisely. Evidence-based fundamentals apply to everyone: progressive loading rather than sudden spikes, adequate recovery, rotator cuff and scapular strengthening, and attention to technique. A physical therapist or sports-medicine provider can tailor these principles to you. Persistent shoulder pain, weakness, or loss of motion should be evaluated professionally.

What Your Genetic Insights Reveal

The Precision Peptide Genetic Test analyzes 14 pathways, 49 peptides, 150+ genetic insights, including variants in collagen and tissue-repair pathways relevant to tendon health. It does not diagnose, treat, or prevent injury. It shows the biological tendencies you carry — context you can bring to a coach, physical therapist, or physician. Genetics is a guide, not a guarantee.

Frequently Asked Questions

Are rotator cuff injuries genetic?

Rotator cuff injuries have a genetic component alongside age, overuse, and biomechanics. Collagen genes such as COL5A1 and COL1A1 influence tendon strength and flexibility, and family studies suggest heritable risk. Genetics tilts the odds, but training, recovery, and technique remain powerful, controllable factors.

What does COL5A1 have to do with tendons?

COL5A1 helps regulate how collagen fibers assemble in tendons and ligaments. Its rs12722 variant has been linked in research to differences in tendon stiffness and injury risk. Because tendons are collagen-rich, variation in this gene can influence how resilient your rotator cuff tendons are.

Can a genetic test prevent a rotator cuff tear?

No. A genetic test cannot prevent or diagnose injury. It offers pathway-level context about collagen and tissue-repair biology that you can discuss with a coach or provider. Prevention still depends on smart loading, recovery, strengthening, and professional guidance tailored to your body.

Want to understand the biology behind your tendon health? The Precision Peptide Genetic Test analyzes collagen and tissue-repair variants so you can bring genetic context to a conversation with your coach or provider.

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

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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.