Genetic risk factors for anterior cruciate ligament ruptures: COL1A1 gene variant
- M Posthumus1,
- A V September1,
- M Keegan1,
- D O’Cuinneagain3,
- W Van der Merwe3,
- M P Schwellnus1,
- M Collins1,2
- 1UCT/MRC Research Unit for Exercise Science and Sports Medicine, Department of Human Biology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
- 2UCT/MRC Research Unit for Exercise Science and Sports Medicine, South African Medical Research Council, Cape Town, South Africa
- 3UCT/MRC Research Unit for Exercise Science and Sports Medicine of the Sports Science Orthopaedic Clinic, Cape Town, South Africa
- Professor M Collins, UCT/MRC Research Unit for Exercise Science and Sports Medicine, PO Box 115, Newlands 7725, Cape Town, South Africa;
- Accepted 6 January 2009
- Published Online First 4 February 2009
Background: Anterior cruciate ligament (ACL) ruptures are considered the most severe injury sustained in sports. Although various intrinsic and extrinsic risk factors have been identified, the exact aetiology of the injury is not yet fully understood. Recently, the gene encoding for the α1 chain of type I collagen (COL1A1) has been shown to be associated with cruciate ligament ruptures and shoulder dislocations.
Objective: To determine whether the functional Sp1 binding site polymorphism within intron 1 of the COL1A1 gene is associated specifically with ACL ruptures in an independent population.
Methods: 117 Caucasian participants with surgically diagnosed ACL ruptures, and 130 Caucasian physically active controls without any history of previous ligament or tendon injuries were recruited for this case–control genetic association study. All participants were genotyped for the COL1A1 Sp1 binding site polymorphism (G/T; rs1800012).
Results: The rare TT genotype was significantly (p = 0.031, OR = 0.08, 95% CI <0.01 to 1.46) under-represented in the ACL group (0 out of 117, 0%), compared with the controls (6 out of 130, 4.6%).
Conclusion: The TT genotype of the COL1A1 Sp1 binding site polymorphism was significantly under-represented in South African participants with ACL ruptures. We propose that this sequence variant be the first specific genetic element to be included in multifactorial models developed to understand the aetiology and risk factors for ACL rupture.
Competing interests: None.