Int J Biol Sci 2008; 4(5):283-290. doi:10.7150/ijbs.4.283 This issue Cite

Review

Advances in Susceptibility Genetics of Intervertebral Degenerative Disc Disease

Yin'gang Zhang1 Corresponding address, Zhengming Sun1, Jiangtao Liu1, Xiong Guo2

1. Department of Orthopaedics of the First Affiliated Hospital, Medical College of Xi'an Jiaotong University, Xi'an, 710061, China
2. Key Laboratory of Environment and Genes Related Diseases of Ministry of Education, Xi'an Jiaotong University, Xi'an, 710061, China

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Zhang Y, Sun Z, Liu J, Guo X. Advances in Susceptibility Genetics of Intervertebral Degenerative Disc Disease. Int J Biol Sci 2008; 4(5):283-290. doi:10.7150/ijbs.4.283. https://www.ijbs.com/v04p0283.htm
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Abstract

The traditional view that the etiology of lumbar disc herniation is primarily due to age, gender, occupation, smoking and exposure to vehicular vibration dominated much of the last century. Recent research indicates that heredity may be largely responsible for the degeneration as well as herniation of intervertebral discs. Since 1998, genetic influences have been confirmed by the identification of several genes forms associated with disc degeneration. These researches are paving the way for a better understanding of the biologic mechanisms. Now, many researchers unanimously agree that lumbar disc herniation appears to be similar to other complex diseases, whose etiology has both environmental and hereditary influence, each with a part of contribution and relative risk. Then addressing the etiological of lumbar disc herniation, it is important to integrate heredity with the environment factors. For the purpose of this review, we have limited our discussion to several susceptibility genes associated with disc degeneration.

Keywords: Intervertebral disc Disease, Degeneration, Candidate Genes, Familial Aggregation

1. Introduction

Intervertebral vertebral disc is a link between the adjacent two vertebrae, which includes anulus fibrosus outside and nucleus pulposus inside. It can buffer the pressure came from the upper body and lower extremities to maintain the physical height and movement of spine. Lumbar disc herniation is that nucleus pulposus protrudes from the defective anulus fibrosus because of its degeneration and it's a common and important cause of low back pain. The traditional view that the etiology of lumbar disc herniation was primarily due to age, gender, occupation, smoking and exposure to vehicular vibration dominated much of the last century [1]. The contribution of other factors such as height, weight and genetics is less certain [2]. In recent years, however, a dramatic advance has been made in our understanding of genetic influences on the risk for disc degeneration, thus changing our traditional views. Genetic factors, in particular, may be largely responsible for the degeneration as well as herniation of intervertebral disc [3]. As Ala-Kokko concluded in her paper, “Even though several environmental and constitutional risk factors have been implicated in this disease, their effects are relatively minor. And recent family and twin studies have suggested that sciatica, disc herniation and disc degeneration may be explained to a large degree by genetic factors” [4]. Now, many researchers unanimously agree that lumbar disc herniation appears to be similar to other complex diseases, whose etiology has both environmental and hereditary influence, each with a part of contribution and relative risk. Then addressing the etiological of lumbar disc herniation, it is important to integrate heredity with the environment factors. For the purpose of this review, we have limited our discussion to several susceptibility genes associated with disc degeneration. Following is a brief review regarding the genetics of disc degeneration, selected from more extensive articles on the same subject.

2. Familial Aggregation of Disc Degeneration and Heritability

The first step in the study of genetic epidemiology is typically to determine if there is a familial aggregation of the condition or the disease of interest, which suggests the possibility of a genetic influence.

In 1991, Varlotta et al [5] found that 32% of adolescent patients with disc herniation had a family history. Matsui et al [6] reported that there is familial clustering of lumbar disc herniation among the encumbrances of 18-year-old or younger patients with lumbar disc herniation. Subsequently, in 1995, Battie et al [7] assessed lumbar MRIs of 115 pairs of male monozygotic twins, to investigate the relative effects of environmental risk factors, age and familial aggregation on disc degeneration. Disc bulging, height narrowing, and disc desiccation as indicated through signal intensity were used as phenotypic clinical markers. In a multivariable analysis of the No.12 thoracic–No.4 lumbar vertebrae region, physical loading exposures explained 7% of the variance in disc degeneration scores among the 230 subjects, with the addition of age to 16% and with the addition of a variable representing familial aggregation to 77%. In the No.4–5 lumbar vertebrae and No. 5 lumbar-No.1 sacral vertebrae region, physical loading measures explained only 2% of the variance in disc degeneration summary scores in multivariable analysis. The variance score in lower lumbar rose to 9% with the addition of age and to 43% with the addition of familial aggregation. This study provided the first estimate of the relative importance of specific environmental agents and overall familial influences including genetic factors. In 1997, Matsui et al [8] analyzed responses from a questionnaire given by 3, 042 Japanese workers at a factory. They found that the average age of the first attack of low back pain in workers whose parents also suffered from the same condition, was significantly younger than that in workers with no similar history.

After the evidence for familial aggregation of disc degeneration was established, there was a need to distinguish between biologic (genetic) and social (cultural inheritance) sources of familial similarity. Sambrook et al [9] conducted a classic twin study to examine the hypothesis that disc degeneration has a major genetic component. Spine MRIs were obtained from 86 pairs of monozygotic twins and 154 dizygotic twins, 80% of whom were female, from Australian and British twin registries. A substantial genetic influence on disc degeneration was found. For a summary score of disc degeneration, comprised of disc height, signal intensity, bulging, and anterior osteophyte formation, heritability estimates were very high, 74% (95% confidence interval, 64%–81%) for the lumbar spine and 73% (95% confidence interval, 64%–80%) for the cervical spine, after adjusting for age, weight, smoking, occupation, and physical activity. The analysis on the individual MRI findings suggested that disc bulging and height were the primary contributors to genetic determination of the disc degeneration summary score. However, the genetic influence on signal intensity was not apparent.

In summary, the observations and studies in juveniles and adults of familial aggregation make a convincing case that intervertebral disc herniation is indeed influenced by familial factors. The studies do not, however, provide data on the relative contributions of genetic and shared environmental factors among family members. However, these findings indicate that stronger genetic effects are associated with an earlier onset of intervertebral disc degeneration.

3. Approaches in studying genetic traits of lumbar disc herniation

At present, approaches of genome-wide scan and candidate-gene have been used in the study of complex diseases by single nucleotide polymorphism (SNPs), which is used as a genetic marker. The candidate-gene approach has been widely used to study susceptibility genes of complex diseases [10]. By literature searches, researchers would find disc metabolism pathway specific-genes, which may be correlated with phenotype of lumbar disc herniation. Then, patients with final diagnosis and normal controls matched with the study group are researched by a case–control study and association study, to compare SNPs of candidate-gene that play a key role in the pathway of disc metabolism or locate the relative domain of chromosome. Its purpose is to select potential susceptible gene by analyzing whether the frequency of gene in two groups has statistical difference. There are four major categories of candidate-genes related to lumbar disc disease (Fig. 1). Category 1 includes the genes association with the construction of the structural component of the intervertebral disc, such as the aggrecan gene and the collagen IX gene. Category 2 consists of genes that produce the degradation enzymes of the disc matrix, for example, the matrix metalloprotease-3 gene. Category 3 is comprised of the genes related to bone structure. The osteoporosis related genes, vitamin-D receptor and estrogen receptor genes, are implicated in lumbar disc disease. Category 4 is others.

 Figure 1 

Categories of candidate-genes related to lumbar disc disease. Note COL=Collage; CILP=cartilage intermediate layer protein; MMP=Matrix metalloprotease; IL=interleukin; VDR=Vitamin D receptor; ER=estrogen receptor; Sox9=SRY (sex-determining region Y)-box9 encoding

Int J Biol Sci Image

4. Candidate-gene polymorphisms associated with disc degeneration

4.1 Type IX collagen

Collagen IX, a structural component of nucleus pulposus and annulus fibrosus of intervertebral disc, is considered to serve as a bridge between collagens and non-collagenous proteins in tissues. It is a heterotrimer of three Alpha chains, 1(IX), 2(IX), and 3(IX), encoded by the genes COL9A1, COL9A2, and COL9A3, respectively. It consists of three collagenous (COL1 to COL3) and four non-collagenous (NC1 to NC4) domains [11]. Collagen IX shares an important role to constitute intervertebral disc, so gene encoding collagen IX is suitable candidate-genes. And COL9A2 and COL9A3 genes are relatively better studied than COL9A1 (references see below). Transgenic mice expressing mutant alpha 1(IX) collagen were reported to have accelerated disc degeneration [12].

4.1.1 COL9A2

In 1999, Annunen et al [13] pointed out that allele of COL9A2 act a significant role in the pathogenesis of disc disease. Studies indicated a heterozygous substitution of Trp for either Gln326 or Arg326 in the COL2 domain changed the structure of collagenous domains of COL2. Because Trp is rarely found in collagenous domains, there are no Trp residues in the collagenous domains of collagen IX in humans or in the mouse [14]. Like many hydrophobic amino acids, Trp may disrupt the collagen triple helix, as well as interfere with the interaction between collagens IX and II or prevent the action of lysyl oxidase, which catalyzes cross-link formation, and thus cause disc disease. Annunen et al used conformation sensitive gel electrophoresis to analyze all the exons and exon boundaries of COL9A2 in patients with the Trp substitution. The analysis did not identify any other possible causes of the disease in the coding sequences or RNA splice sites, but it indicated two additional changes, an A to G change affecting the third nucleotide in the codon for proline (CCA to CCG) at nucleotide 9 in exon 21, and a G to A change at nucleotide +17 in intron 30.

An outcome of conspicuous heredity and phenotype was discovered in a Finnish population carrying allele COL9A2 with the Trp (Trp2) substitution. The Trp2 allele was found in 6 of 157 Finnish patients (4%) but in none of 174 control individuals. Coinheritance of the Trp2 allele and the phenotype was studied in the families of four original patients. All members who had inherited the allele in these families had intervertebral disc disease [13]. Jim et al [15] reported that Trp2 allele has a higher frequency in a Southern Chinese population than in a Finnish population. The Trp2 allele was present in 20% of 804 samples. Affected Trp2 individuals had more severe degeneration, moreover, the association was age-dependent [15, 16]. Seki et al [17] reported Trp2 was common in Japanese, and no association with lumbar disc degeneration was apparent. However, association of a COL9A2 specific haplotype with lumbar disc degeneration was detected. Accordingly, the allelic variation of COL9A2 that is associated with lumbar disc disease is dependent on race and nationality.

4.1.2 COL9A3

In the case-control study of the Finnish population of relative homogeneity, Petteri et al [18] found that for an individual carrying allele COL9A3 with the Trp (Trp3) substitution, the risk of disc disease increased nearly 3-fold compared with an individual without Trp3. The site of mutation was an Arg103→Trp substitution in the a3 (IX) chain (Trp3allele). A study of 164 individuals with lumbar disc disease and 321 controls (186 healthy, 83 with osteoarthritis, 31 with rheumatoid arthritis, and 21 with chondrodysplasia), showed the frequency of the Trp3 allele as 12.2% in the case sample and 4.7% in the control group, the differences were statistically significant. The results indicated that the Trp3 allele may cause lumbar disc disease. But, it is noteworthy that the association with Trp3 allele in the Finnish population has not been successfully replicated in the Greek population [19].

Solovieva's [20] study found that the carriage of the Trp3 allele in the absence of the IL-1betaT (3954) allele increased the risk of dark nucleus pulposus and joint occurrence of degenerative changes by MRI. There was no effect of the Trp3 allele on disc degeneration in the presence of the IL-1betaT (3954) allele. The outcomes suggest that the effect of the COL9A3 gene polymorphism on disc degeneration may be modified by the IL-1beta gene polymorphism. The Trp3 allele was also associated with radiographic features of Scheuermann disease [21].

Solovieva et al [22] had further researched the relation of gene-environment interaction, and found that incidence rate of lumbar disc degeneration was increased for interactions of the mutation of COL9A3 gene with persistent load on disc. In a study of 135 male individuals with Trp3, it was discovered that the incidence rate of lumbar disc degeneration was 71% in obese patients compared with only 45% in subjects who were not obese. It is thus evident that prevalence of disc degeneration could be strikingly increased when there is the synergistic effect of gene-environment interaction.

4.2 Type I collagen

Collagen I is an important ingredient of bone and anulus fibrosus of disc. Pluijm et al [23] and Tilkeridis et al [24] reported that the risk of disc degeneration for people with the TT genotype was higher than people with the GG or GT genotype. Mann found that presence of the T allele in the COLIA1 Sp1 binding site has functional effects on the collagen gene regulation that leads to a higher COLIA1 mRNA expression level, an increase COLIA1 protein expression level and COLIA1/COLIA2 protein ratios [25]. An abnormal ratio of collagen is associated with impaired bone structure. Moreover, the intronic polymorphism of the Sp1 binding site of COLIA1 may affect the transcription of collagen I. There may be interactions with other genes or environmental factors. However, how defects in collagen I influence the development of disc degeneration is still unclear and needs further investigation. The relative interpretation between gene and disease has disparity. Therefore, association analysis with large sample size is indispensable to research the relation between the Sp1 binding site of COLIA1 and disc degeneration.

4.3 Type IV and X collagen

Wang et al [26] reported that type IV collagen occurring in the disc of adolescents is the result of early cellular reaction to harmful stimuli, and this can serve as a biological marker for early degeneration of human lumbar intervertebral discs. Nerlich et al [27] found that collagen type X was expressed by nuclear chondrocytes at a higher age and was associated with advanced degenerative disc alterations. Hence both of them may be taken as molecular markers of disc degeneration. To date, there are no known associations of polymorphisms in collagen type IV and/or collagen type X genes, with intervertebral disc disease.

4.4 Sox9

Sox9 is one of a family of genes related to the mammalian Y-linked, testis-determining gene Sry [28]. Sox genes appear to encode transcription factors with diverse roles in differentiation and development. Sox9 is expressed in mesenchymal condensations prior to and during chondrogenesis, and it has been shown to activate Col2a1, the gene encoding type II collagen, the major component of cartilage matrix [29, 30]. Sox9 has been shown to regulate the genes encoding aggrecan [31] and type XI collagen [32], and may also regulate other structural and/or patterning gene involved in cartilage and bone development [33]. Expression and regulation of Sox9 gene also were seen at the nucleus pulposus cells [34].

Paul et al [35] have explored the use of Sox9 gene therapy for degenerative disc disease. They used adenoviral delivery vectors expressing Sox9 to infect a chondroblastic cell line and human disc cells; Sox9 and Type II collagen production increased. In addition, AdSox9 virus was injected directly into the discs of rabbits, they have reported that the expression was preserved for 5 weeks. Gruber et al considered that loss of expression of Sox9 in some of the anulus cell population may play a role in disc aging and degeneration, possibly by decreased modulation of the expression and production of Type II collagen of disc cells [36]. Sox9 is co-expressed with Col2a1. Mutation and polymorphism of Sox9 gene and association with intervertebral disc degeneration remain to be studied.

4.5 Vitamin D receptor

Studies found that Vitamin D receptor play an important role in normal bone mineralization and remodeling, and its gene polymorphisms are thought to correlate with some disease. Videman et al [37] and Kawaguchi et al [38] reported that subjects with the tt or Tt allele of the vitamin-D receptor gene were more frequently associated with multilevel and severe disc degeneration and disc herniation than ones with the TT allele. They pointed an increased risk of disc disease at an early age in subjects with the Tt allele in the vitamin-D receptor gene. On the other hand, in an evaluation of the association between allelic variations in the vitamin-D receptor gene and spinal degenerative disease, Jones et al [39] found a sharp decrease in the risk of spinal osteophytosis and the presence of disc narrowing between tt and TT. Spinal osteophytosis and disc narrowing are closely related to disc degeneration. Furthermore, Videman et al [40] found two intragenic polymorphisms of the vitamin D receptor gene associated with disc degeneration. Quantitatively assessed signal intensities of thoracic and lumbar (No.6 thoracic–No.1 sacral vertebrae) discs were 12.9% worse in men with the Taql tt genotype and 4.5% worse in men with the Tt genotype, compared with signal intensity in men with the TT genotype. A similar pattern was found between disc signal intensity and Fok l polymorphisms; men with the ff and Ff genotypes had mean signal intensities that were 9.3% and 4.3% lower, respectively, than those in men with FF genotypes. The summary scores of qualitatively assessed signal intensity, bulging, and disc height were 4.0% and 6.9% worse in men with Ff and ff genotypes, respectively, when compared with those in men with the FF genotype. Cheung et al [41] had further confirmed that the t allele of vitamin D receptor Taq I was associated with a high risk of degenerative disc disease and disc bulge developing, especially in individuals younger than 40 years.

It has been reported that the vitamin-D receptor is expressed not only in osteoblasts [42] but also in the chondrocytes [43]. Balmain et al found immunoreactive vitamin-D receptor in the nucleoli of the chondrocyte, particularly in the fibrillar component, suggesting that vitamin D is directly involved in the differentiation, proliferation, and maturation of cartilage cells. In addition, vitamin D can influence proteoglycan synthesis by articular chondrocytes in vitro [44]. Since the intervertebral disc is also rich in proteoglycan, these findings suggest that the vitamin-D receptor may be directly involved in the pathophysiology of the degenerated intervertebral disc. At present, it is still unknown how the genetic variants of the vitamin- D receptor gene affect the clinical presentation of disc disease. Kawaguchi et al speculated that this polymorphism in the vitamin-D receptor gene might alter the structural characteristics of the matrix in the intervertebral disc [38]. Furthermore, he further considered the possibility that vitamin-D receptor gene polymorphism is not directly involved in the pathogenesis of lumbar disc disease but merely a marker for other genes. The vitamin-D receptor gene is located on chromosome 12q12 [45]. The type-2 collagen (COL2A1) gene and insulin-like growth factor (IGF) type-1 gene are also located nearby [46]. It is likely genetic marker of degenerative disc disease.

4.6 Matrix metalloprotease-3

Studies suggest that matrix metalloprotease-3 (MMP-3) has an important role in the degeneration of intervertebral discs [47]. MMP-3 expression is induced in response to local conditions such as mechanical loading [48] and inflammation [49]. A common 5A/6A polymorphism in the promoter region of the human MMP-3 gene has been identified [50].This polymorphism was reported to be involved in the regulation of MMP-3 gene expression with the 5A allele having twice as much promoter activity as the 6A allele [51]. Takahashi et al [52] studied elderly Japanese subjects, and found that the 5A5A and 5A6A genotype in the elderly was associated with a significantly larger number of degenerative intervertebral discs than the 6A6A, but there was no significant difference in the young. These studies indicate that the 5A allele of the human MMP-3 promoter may be a crucial risk factor for the acceleration of intervertebral disc degeneration, especially in the older population.

4.7 Interleukin-1

Inflammatory cytokines have a well-recognized contribution to the generation of back pain. Interleukin-1 in particular contributes to disc degeneration by inducing enzymes that destroy proteoglycan and it is involved in the mediation of pain. Solovieva et al [53, 54] have demonstrated an association between interleukin-1 polymorphisms and features of disc degeneration on magnetic resonance imaging in male Finnish workers. The TT genotype of the IL-1 gene was associated with more than a 3-fold increase in the risk of disc bulges among middle-aged occupationally active men. The polymorphisms were associated with a 2.5-fold increased risk of back pain, and an association was also seen with the intensity and duration of pain together, with the degree of functional limitation. Ye et al [55] have suggested -511T>C SNP in IL-1β gene associates with Lumbar disc disease in Chinese.

Besides, Valdes have tested polymorphisms of genes that express inflammatory factors, and found some of the same polymorphisms, such as CD36, COX2, NCOR2, TNA and ESR1, affecting knee OA susceptibility, were also associated with radiographic progression of lumbar disc degeneration [56]. Polymorphisms of gene of cartilage intermediate layer protein were associated with the pathogenesis of lumbar disc disease [57].

5. Overview

Lumbar disc degeneration is not only regulated by multiple genes and some environmental factors, but also gene-gene interactions and gene-environment interactions may also exist. At present, the study of allele of COL9A2 is more extensive than the other genes associated with lumbar disc disease. However, it is necessary for long-term study and research to integrate larger sample size with clinical and controlled study of different populations. Study of allele of COL9A3, vitamin D receptor and matrix metalloprotease-3 gene were only confined to the superficial correlation of elementary and clinical research. Hereditary and mechanism of these genes are still unknown. The role of collagen and its gene mutation, which occur frequently in the pathogenesis of lumbar disc disease, has been researched to a certain extent. However, it is essential to perform further research in order to better understand the interrelation of genetic genes and environmental factors. With the continual development of genome-wide scan, effective means is offered to find numerous genes, each with a small overall contribution to the pathogenesis of lumbar disc degeneration. Researchers may delimit a specific domain by genome-wide scan and then scan eligible SNPs located in the domain, find virulence genes by analysis of linkage disequilibrium, in order to search for early biomarkers for susceptible individuals.

Although the complex contributions and interactions of genetic and environmental factors are largely unknown, work has begun in this area. On the whole, genetic study with relation to lumbar disc disease would offer new evidence for prevention and cure of lumbar disc disease.

Acknowledgements

We are grateful for the support from The Natural Scientific Fund of China (No. No.30400163) and The Clinical Researched Fund of First Affiliated Hospital of Medical College of Xi'an Jiaotong University. Special thanks are given to Professor Deng Chu-Xia for the instructive suggestions and the critical comments from referees.

Conflict of Interest

The authors have declared that no conflict of interest exists.

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Author contact

Corresponding address Correspondence to: Dr. Yin'gang Zhang, Department of Orthopaedics of the First Affiliated Hospital, Medical College of Jiaotong University, Xi'an, 710061, China, E-mail: zyingangxjtu.edu.cn, Tel: +86-029-85323935


Received 2008-6-27
Accepted 2008-8-31
Published 2008-9-2


Citation styles

APA
Zhang, Y., Sun, Z., Liu, J., Guo, X. (2008). Advances in Susceptibility Genetics of Intervertebral Degenerative Disc Disease. International Journal of Biological Sciences, 4(5), 283-290. https://doi.org/10.7150/ijbs.4.283.

ACS
Zhang, Y.; Sun, Z.; Liu, J.; Guo, X. Advances in Susceptibility Genetics of Intervertebral Degenerative Disc Disease. Int. J. Biol. Sci. 2008, 4 (5), 283-290. DOI: 10.7150/ijbs.4.283.

NLM
Zhang Y, Sun Z, Liu J, Guo X. Advances in Susceptibility Genetics of Intervertebral Degenerative Disc Disease. Int J Biol Sci 2008; 4(5):283-290. doi:10.7150/ijbs.4.283. https://www.ijbs.com/v04p0283.htm

CSE
Zhang Y, Sun Z, Liu J, Guo X. 2008. Advances in Susceptibility Genetics of Intervertebral Degenerative Disc Disease. Int J Biol Sci. 4(5):283-290.

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