The functioning of the musculoskeletal system—including muscles, tendons, and ligaments—depends directly on the quality of the extracellular matrix (ECM), a structure that provides support and mechanical strength to tissues.

Small changes in how collagen is produced and organized can significantly impact tissue strength, increasing or reducing the risk of injury.

Is it possible to predict injuries through genetics?

The current answer from sports science is: not in a deterministic way, but rather probabilistically. Genetic analysis does not act as an absolute predictor (a “crystal ball” that determines injury occurrence), but as an identification of genotypic susceptibility—that is, your likelihood of sustaining an injury.

Genomic studies and meta-analyses demonstrate that Single Nucleotide Polymorphisms (SNPs) alter gene transcription rates and the microarchitecture of connective tissue. The presence of certain alleles acts as an intrinsic risk factor.

When this underlying genetic factor interacts with extrinsic factors (acute spikes in the acute/chronic workload ratio, altered biomechanics, or insufficient recovery time), the threshold for mechanical tissue failure is reached more quickly.

Therefore, genetics predicts the magnitude of risk and regenerative potential, serving as a tool for precision sports medicine.

Which genes influence the risk of sports injuries?

COL1A1 (rs1800012) — Protective effect on structure

Type I collagen is the primary protein responsible for the tensile strength of ligaments (such as the ACL) and tendons. This variant subtly alters the ratio of collagen chains (α1 and α2) during triple helix formation, resulting in biomechanical properties that favor elastic energy absorption and reduce the incidence of acute ACL ruptures and tendinopathies.

COL5A1 (rs12722 and rs10628678) — Fibril organization

Type V collagen regulates fibrillogenesis, controlling the diameter and alignment of type I collagen fibrils. Carriers of risk alleles in this polymorphism present tendons with altered stiffness and greater susceptibility to cumulative microtrauma (Achilles tendinopathy) and ligament ruptures.

These genetic variants are essential in identifying structural fragility.

GDF5 (rs143383) — Recovery and repair capacity

Growth Differentiation Factor 5 is crucial for tissue homeostasis and repair after exercise-induced microdamage. Evidence suggests that athletes with the risk genotype have reduced tissue remodeling capacity between training sessions, strongly predisposing them to chronic injuries such as degenerative tendinopathies.

I found out I have a higher injury risk: what should I do in practice?

1. Biological control and load periodization

Individuals with lower tissue repair efficiency cannot tolerate the same training density as athletes with favorable genetic profiles. The macrocycle should include gradual load progression and longer recovery periods after plyometric or high-impact sessions, ensuring adequate biological time for enzymatic synthesis and matrix repair.

Adjusted training load is key for prevention in this case.

2. Emphasis on eccentric training

Controlled mechanical tensile stress acts directly on fibroblast mechanoreceptors (mechanotransduction), “forcing” the synthesis of a denser ECM and promoting parallel realignment of new collagen fibrils, mitigating the underlying genetic deficiency.

3. Targeted nutritional intervention

Prophylactic supplementation and correction of the nutritional foundation for extracellular matrix and connective tissue construction are essential.

Without proper structural support, the risk of injury increases even further.

Conclusion

Genetics does not act as an absolute determinant but as a modulator of sports injury risk. When integrated with training load analysis, biomechanics, and recovery strategies, it becomes a strategic tool for prevention and personalization of athletic performance.