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Genetic basis of rotator cuff injury: a systematic review
BMC Medical Genetics volume 20, Article number: 149 (2019)
Rotator cuff disease is a widespread musculoskeletal pathology and a major cause of shoulder pain. Studies on familial predisposition suggest that genetic plays a role in the pathogenesis of rotator cuff disease. Several genes are responsible for rotator cuff disease. The aim of this study was to perform a systematic review on genetic association between rotator cuff disease and genes variations.
A systematic review of the literature was performed, in accordance with the PRISMA guidelines. PubMed, Medline, CINAHL, Cochrane, Embase and Google Scholar databases were searched comprehensively using the keywords: “Rotator cuff”, “Gene”, “Genetic”, “Predisposition”, “Single-nucleotide polymorphism” and “Genome-wide association”.
8 studies investigating genes variations associated with rotator cuff tears were included in this review. 6 studies were case-control studies on candidate genes and 2 studies were GWASs. A significant association between SNPs and rotator cuff disease was found for DEFB1, FGFR1, FGFR3, ESRRB, FGF10, MMP-1, TNC, FCRL3, SASH1, SAP30BP, rs71404070 located next to cadherin8. Contradictory results were reported for MMP-3.
Further investigations are warranted to identify complete genetic profiles of rotator cuff disease and to clarify the complex interaction between genes, encoded proteins and environment. This may lead to individualized strategies for prevention and treatment of rotator cuff disease.
Level of evidence
Level IV, Systematic Review.
Rotator cuff disease is a widespread musculoskeletal pathology and a major cause of shoulder pain . This disabling condition has high prevalence, affecting 30–50% of the population older than 50 years of age . Rotator cuff disease is a common health concern among working populations. The impact of this condition on earnings, missed workdays, and disability payments is relevant .
The etiology of rotator cuff disease is multifactorial [2,3,4,5,6,7] and its pathogenesis is not completely understood. In addition to aging, several factors can contribute to its etiopathogenesis, such as overuse, mechanical impingement, and smoking [3, 5, 8]. Studies on familial predisposition suggest that genetic plays a role in the pathogenesis of rotator cuff disease. Family members of patients with rotator cuff tears have a significantly higher risk of rotator cuff tears than general population [9, 10]. Tashjian et al. determined an increased risk of tears in family members of patients with rotator cuff tears that extends out and beyond third-cousin relationships . Genetic predisposition may play a role also in clinical presentation and progression of rotator cuff tears. Genetically susceptible patients experience symptoms more often [12,13,14,15], in fact the relative risk of having a painful tear is 1.44 for siblings of a symptomatic patient . These inheritable characteristics may affect any point of the sensorineural pathway. Moreover, the progression of a tear over a five-year period, is greater in siblings than in controls (tear size increased in 16.1% of siblings, compared with 1.5% of control group) .
Several genes are responsible for rotator cuff disease. Genetic susceptibility may affect the ultrastructure of the tendon. Achilles tendinopathy has been associated with polymorphisms of tenascin C and collagen type Va . Similar mechanisms could play a role in the pathogenesis of rotator cuff disease. The genetic basis of this condition may also result from aberrations in the normal cell regulation of apoptosis and tissue regeneration.
The aim of this study was to perform a systematic review on genetic association between rotator cuff disease and candidate genes.
A systematic review of the literature was performed in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines with a PRISMA checklist and algorithm.
A comprehensive search of MEDLINE, PubMed, Cochrane, EMBASE, CINAHL, and Google Scholar databases using various combinations of the keywords: “Rotator cuff”, “Gene”, “Genetic”, “Predisposition”, “Genome-wide association”, “Single-nucleotide polymorphism” was performed. Three independent reviewers (U.G.L., V.C., and A.B.) conducted the search separately. All scientific journals were considered, and all relevant studies were analysed.
In order to qualify, an article must have been published in a peer-reviewed journal All articles were initially screened for relevance. The three investigators separately reviewed each abstract and completed a close reading of all articles to minimize selection bias and error. According to the Oxford Centre of Evidence-Based Medicine, only Level I to Level IV articles in English were included in our study.
We included articles that described genetic variations (single-nucleotide polymorphism, SNP) associated with rotator cuff disease. Both case-control studies focused on candidate genes and Genome-wide association studies (GWASs) were included. Studies should clearly describe the criteria used for the diagnosis of rotator cuff disease, genes and SNPs investigated. Missing data relevant to these parameters warranted exclusion from this systematic review. We did not included studies about familial predisposition, genetic variants and gene expression patterns associated with rotator cuff disease and/or healing. Literature reviews, case reports, animal and cadaveric studies, technical notes, letters to the editor, and instructional courses were excluded.
Finally, in order to avoid bias, the selected articles and their references, and the articles excluded from the study were reviewed, evaluated, and discussed by all the authors. All investigators independently extracted the type of study, number of cases and controls, diagnostic criteria of rotator cuff disease, investigated genes, mean age of cases and controls.
We used the Coleman Methodology Score to assess the quality of the selected studies (CMS) , in which ten criteria are used to render a score ranging from 0 to 100 points (a score of 100 indicating a study that largely avoids chance, various biases, and confounding factors). The final score is defined as excellent (85 to 100 points), good (70 to 84 points), fair (50 to 69 points), and poor (< 50 points).
The subsections of the CMS are based on the subsections of the CONSORT statement outlined for randomized controlled trials, which have been modified to allow for other trial designs. Coleman criteria were subjected to modification in order to make them reproducible for this systematic review. Each study was scored by the three reviewers (U.G.L., V.C. and A.B) independently and in triplicate.
The literature search and the cross-referencing process resulted in 251 articles. 213 studies were assessed for relevance by title and abstract. 38 duplicates were removed and 200 were excluded because they did not meet inclusion criteria. After reading the remaining full-text articles, we rejected 3 studies about familial predisposition and 2 studies about genetic expression. Finally, 8 articles were included in the present review [19,20,21,22,23,24,25,26]. The flow-chart of literature search is shown in Fig. 1. Features of the studies are shown in Table 1.
8 studies investigating genes variations associated with rotator cuff tears were included in this review. 6 studies were focused on candidate genes [19,20,21,22,23,24] and 2 studies were GWASs [25, 26].
The following candidate genes were investigated: DEFB1, DENND2C, ESRRB, FGF3, FGF10, FGFR1, MMP-1, MMP-2, MMP-3, MMP-9, MMP-13, Col5A1, TNC, FOXP3, FCRL3. A significant association between SNPs and rotator cuff disease was found for DEFB1, FGFR1, FGFR3, ESRRB, FGF10, MMP-1, TNC, FCRL3. Contradictory results were reported for MMP-3 [21, 22].
The mean CMS score was 71 points (range from 71 to 84), indicating that the methodological quality of the included studies was good. There was no statistically significant difference among the CMS values of the examiners.
This systematic review outlines the current knowledge in the field of genetics in rotator cuff disease. Preliminary evidences of genetic and familiar predisposition to rotator cuff tears provided the basis for further studies that better highlight the importance of the genetic component in the pathogenesis of rotator cuff disease. In 2017, Dabija et al.  reviewed the literature on this topic describing the results of 4 studies investigating familiar predisposition and 3 studies investigating genes associated with rotator cuff tears. Up to day, we found other 5 studies focused on genetic variations associated with rotator cuff diseases. Even if the pathogenesis of rotator cuff disease is still largely unknown, recent studies on candidate genes and GWASs draw attention to SNPs associated with rotator cuff disease [27, 28, 30].
Several genes variations have been associated with rotator cuff tears. Interactions between genes, encoded proteins and environment play a complex role in the development of rotator cuff disease .
Motta et al. assessed 23 SNPs in 6 candidate genes (DEFB1, DENND2C, ESRRB, FGF3, FGF10, and FGFR1) in 203 cases and 207 controls . The products of these genes are reported to have a role in tendon repair and degenerative processes. Rotator cuff disease was associated with certain haplotypes in DEFB1, FGFR1, FGFR3, and ESRRB. After adjustment by ethnic group and sex another association in FGF10 was revealed.
The association of variants in ESRRB and rotator cuff disease was further demonstrated by Teerlink et al. . They identified high-risk haplotypes in the ESRRB gene comparing genotypes of 175 patients with rotator cuff tears with 2595 genetically-matched Caucasian controls. ESRRB is a protein-encoding gene classified as an orphan nuclear receptor, since its exact ligand is not known. It is involved in hearing loss , stem cell pluripotency , and cellular remodeling of energy consumption under conditions of hypoxia . ESRRB induces hypoxia-inducible factor (HIF) transcription, and their interaction may be involved in tenocyte apoptosis .
Several studies selected candidate genes on the basis of pre-existing association analyses for Achilles tendon ruptures (TNC, Col5A1, and MMP-3) [35,36,37], tendinopathies of the elbow (Col5A1) , ruptures of the posterior tibial tendon (MMP-1)  and matrix metalloproteinase genes MMP-1, MMP-2, MMP-3, MMP-9, MMP-13, TIMP-1 that are specifically expressed in torn rotator cuff.
Kluger et al. found no differences in genotype and allele frequencies for SNPs in MMP-1, MMP-2, MMP-3, MMP-9, MMP-13, and Col5A1 genes while six SNPs in Tenascin-C (TNC) were associated with degenerative rotator cuff tears . Unlike their study, Assunção et al.  found a significant association between genetic polymorphism of MMP-3 and rotator cuff tearing that may be explained by the smaller number of individuals evaluated, nonpairing between cases and controls for age, and known risk factors such as high blood pressure, and racial and genetic characteristics of the population. Moreover, Assunção et al. studied a different polymorphism in MMP-1 (rs1799750) that was significantly associated with rotator cuff tearing.
As demonstrated in in-vivo studies, the immune cells play a key role in the pathophysiology of rotator cuff tears. Salles et al. found an increased risk of tendinopathy associated with Fc receptor-like 3 polymorphism (FCRL3 − 169 T > C) . FCRL3 is a glycoprotein of the immunoglobulin receptor superfamily, expressed in Treg cells that may play a role as a negative regulator of Treg function [40,41,42].
GWASs are a powerful tool to pinpoint genes that may contribute to the risk of developing rotator cuff disease. The GWAS by Tashjian et al. identified two significant SNPs associated with rotator cuff tears: SASH1 (rs12527089) and SAP30BP (rs820218) . Those genes are associated with the cellular process of apoptosis. SASH1 is a tumor suppressor gene that is ubiquitous expressed and, therefore, may be a potential candidate for dysregulation in musculoskeletal tissue. SAP30BP is a ubiquitously present transcriptional regulator protein on chromosome 17. It may act as a transcriptional co-repressor of a gene related to cell survival .
In another GWAS, Ross et al. found a SNP located next to cadherin8 significantly associated with rotator cuff injury. It encodes a protein involved in cell adhesion .
Studies on candidate genes and GWASs identified several genes variation associated with rotator cuff tears, such as DEFB1, FGFR1, FGFR3, ESRRB, FGF10, MMP-1, TNC, FCRL3, SASH1, SAP30BP, rs71404070 located next to cadherin8.
Further investigations are warranted to identify complete genetic profile of rotator cuff disease and to clarify the complex interaction between genes, encoded proteins and environment. This may lead to individualized strategies for prevention and treatment of rotator cuff disease.
Availability of data and materials
The dataset supporting the conclusions of this article is included within the article.
Cumulative Index to Nursing and Allied Health Literature
Coleman Methodology Score
Collagen type V alpha 1 chain
DENN Domain Containing 2C
Fibroblast growth factors
Fibroblast growth factors receptor
Forkhead box P3
Genome-wide association studies
Preferred Reporting Items for Systematic Reviews and Meta-Analyses
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Longo, U., Candela, V., Berton, A. et al. Genetic basis of rotator cuff injury: a systematic review. BMC Med Genet 20, 149 (2019) doi:10.1186/s12881-019-0883-y
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