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Genetic variants in mannose receptor gene (MRC1) confer susceptibility to increased risk of sarcoidosis
© Hattori et al; licensee BioMed Central Ltd. 2010
Received: 29 March 2010
Accepted: 28 October 2010
Published: 28 October 2010
Mannose receptor (MR) is a member of the C-type lectin receptor family involved in pathogen molecular-pattern recognition and thought to be critical in shaping host immune response. The aim of this study was to investigate potential associations of genetic variants in the MRC1 gene with sarcoidosis.
Nine single nucleotide polymorphisms (SNPs), encompassing the MRC1 gene, were genotyped in a total of 605 Japanese consisting of 181 sarcoidosis patients and 424 healthy controls.
Suggestive evidence of association between rs691005 SNP and risk of sarcoidosis was observed independent of sex and age in a recessive model (P = 0.001).
These results suggest that MRC1 is an important candidate gene for sarcoidosis. This is the first study to imply that genetic variants in MRC1, a major member of the C-type lectin, contribute to the development of sarcoidosis.
Sarcoidosis is a multi-organ inflammatory disease with exaggerated cellular immune activity that leads to formation of non-caseating granulomas in the affected organs. Although the causes of sarcoidosis remain unclear, several lines of evidence support the idea that sarcoidosis results from exposure of genetically susceptible individuals to unknown environmental triggers [1–9]. Amomg this evidence, environmental pathogens such as Mycobacterium and Propionibacterium species have been suggested to play roles in the pathogenesis of sarcoidosis [7–9]. Recent insights into the complex mechanisms underlying human innate immunity suggest that genetic variability in the genes encoding immune system components plays a role in the development of chronic inflammatory diseases. In particular, the association between sarcoidosis and genetic variants of several pattern recognition receptors (PRRs), such as Toll-like receptors (TLRs), have been extensively analyzed [10–12]. Although TLRs are an important system for microbial sensing, they are not the only PRRs with this function. At the cell-surface, C-type lectin-like molecules, such as the mannose receptor and the β-glucan receptors, also participate in the binding and uptake of microbial components [13, 14]. Components of bacteria and viruses that gain entry into the cytoplasm are recognized by cytosolic receptors, through which they induce cytokine production and cell activation [15, 16]. Recent studies have shown the genetic association between sarcoidosis and non-TLRs [11, 17]. Mannose receptor (MR) is a member of the pattern-recognition C-type lectin receptor (CLR) family, which plays an important role in innate immunity. MR is predominantly present on macrophages and dendritic cells and recognizes glycan structures containing mannose, fucose and N-acetylglucosamine, which are commonly found on the cell walls of pathogenic micro-organisms such as mycobacteria, fungus, parasites and yeast . We therefore speculated that the MRC1 gene may be an excellent candidate for susceptibility to sarcoidosis, and tested for associations between MRC1 polymorphisms and the development of sarcoidosis in our Japanese case-control analysis.
We enrolled unrelated subjects in this case-control study to search for susceptibility genes to sarcoidosis. A total of 181 Japanese subjects with sarcoidosis were recruited from the pulmonary clinic of the First Department of Medicine at Hokkaido University Hospital. Diagnosis of sarcoidosis in each patient was based on compatible clinical findings, histological demonstration of noncaseating epithelioid cell granuloma, and exclusion of other diseases capable of producing a similar histological or clinical picture, as recommended by the American Thoracic Society (ATS)/European Respiratory Society (ERS)/World Association of Sarcoidosis and Other Granulomatous Disorders (WASOG) statement. A total of 424 healthy controls, comprising individuals with no history of asthma or any other chronic pulmonary diseases, were recruited from individuals visiting the clinic for annual routine physical examinations and students at the School of Medicine at Hokkaido University. All subjects were unrelated and of Japanese descent. The medical ethics committee of Hokkaido University Graduate School of Medicine approved this study.
SNP Selection and Genotyping
Primers for allele specific PCR
5' ACTCAGTTACTTTCATTTGTTTATTCCTTAAC 3'
Reverse for A
5' CCTTTAATTAAATCAAAATTGAGTTCAT 3'
Reverse for G
5' CCTTTAATTAAATCAAAATTGAGTTCAC 3'
5' GAATCTCAGATTATGAGTGTTGCATTT 3'
Reverse for A
5' CATAGAGAGTGATAGCAACCCAGTCT 3'
Reverse for G
5' CATAGAGAGTGATAGCAACCCAGTCC 3'
Forward for A
5' GGGATTGCAAGCGTGAGACA 3'
Forward for C
5' GGGATTGCAAGCGTGAGACC 3'
5' TTTGCAGATTCTACGACTTGAAAAAG 3'
Forward for A
5' GAGCTCCTGAGCATCACAGAGATA 3'
Forward for T
5' GAGCTCCTGAGCATCACAGAGATT 3'
Reverse for A
5' ACTACCTGTCAGGTATGTTTGCTCAT 3'
Reverse for T
5' CTTACCTGTCAGGTATGTTTGCTCAT 3'
Forward for A
5' CAATAAAGGTCTCTGTTTAAAGTTTCAA 3'
Forward for G
5' CAATAAAGGTCTCTGTTTAAAGTTTCAG 3'
Reverse for A
5' CAACACATCAGGGATACTCTGAGAAT 3'
Reverse for G
5' GTACCCAACACATCAGGGATACTCT 3'
5' AGGGATGCTCTGACCACCTG 3'
Reverse for A
5' GTGTGGATACTTGCGAGGTCTCT 3'
Reverse for G
5' TGTGGATACTTGGGAGGTCTCC 3'
Forward for C
5' TCTCTTTGGTACAACATAGTAAATCTCACC 3'
Forward for T
5' TCTCTTTTTGGTACAACATAGTAAATCTCACT 3'
Reverse for C
5' TTACCAACTGTTTTCCCATAATTGTG 3'
Reverse for T
5' CCAACTGTTTTCCCATAATTGTGAG 3'
Each of the SNPs in the MRC1 gene was tested for deviation from Hardy-Weinberg equilibrium using a χ2 test. Both genotypic and allelic association among subjects with sarcoidosis and healthy controls were statistically compared using the logistic regression analysis adjusting for sex and age. The relative risk was estimated as odds ratios (OR) with 95% confidence intervals (95%CI). For LD mapping, pair-wise LD between polymorphisms in MRC1 was evaluated using Haploview software version 4.2 . For haplotype analyses, we used the haplo.score program, which calculates simulation P values for each haplotype and further adjusts for covariates. Haplotypes with frequency below 5% were excluded from haplotype analysis. These statistical analyses were performed using a program R version 2.11.1 (http://www.r-project.org/) . P values were adjusted using the Bonferroni correction for 10 tests. Levels of significance for all statistical analyses were set to P < 0.005.
Characteristics of 605 Japanese subjects
Control (n = 424)
Sarcoidosis (n = 181)
Age (median, range) †
Occular lesion (%)
Cutaneous lesion (%)
Cardiac lesion (%)
Allele and genotype frequencies for 9 SNPs in MRC1 among subjects with sarcoidosis and control subjects
Controls n (%)
Cases n (%)
Controls n (%)
Cases n (%)
Odds ratios (OR) and P values for 9 SNPs in MRC1 among subjects with sarcoidosis and control subjects
OR [95% CI]*
OR [95% CI]*
Estimated haplotype frequencies and association with sarcoidosis
simulated P †
Based on LD structure and significant association of rs691005 for initial analysis, we further genotyped two additional SNPs (rs554995 and rs554313) close to rs691005. Unfortunately, these two SNPs did not show significant associations (Tables 3 and 4). Although three SNPs (rs554995, rs554313 and rs691005) showed strong LD, significant associations were not found in haplotype analysis (Table 5).
In the present study we demonstrated the association between MRC1 polymorphisms and risk of sarcoidosis in Japanese population. In support of this, the association of one SNP (rs691005) was confirmed considering for multiple testing and Bonferroni correction, suggesting MRC1 gene as a plausible candidate gene for development of sarcoidosis. Of interest, recent genome-wide association analyses have shown that 10p12, where MRC1 is situated, is a susceptibility locus for the development of sarcoidosis . Thus, findings of the current study suggest that MRC1 gene variants may contribute to the development of sarcoidosis.
The rs691005 located within the 3'-untranslated region (3'-UTR) of MRC1 showed the strongest association (OR 2.53). Although the real functions of this gene are unclear, variants in the 3'-UTR are known to disrupt a regulatory binding sequence and alter mRNA expression . Alternatively, this variant may be representative of the region or correlated with a true functional variant. Thus, our current results provide a basis for further identification of the causative variants underlying the relationship between MRC1 gene sequences and sarcoidosis.
It should be noted that SNPs with two positions were mapped to MRC1 spanning chr10:17,891,368-17,993,183 (HapMap Data Rel 27) and were referred to by their MRC1L1 'rs'numbers (NCBI EntrezSNP database Build 130). Alter et al reported no evidence for a common gene duplication event . The authors suggested that MRC1L is an erroneous annotation caused by the presence of a sequence gap and the incorrect assignment of a polymorphic haplotype.
We also reported the association of MRC1 gene polymorphism and risk of asthma in two independent ethnically diverse populations , suggesting that MRC1 might be involved in the pathogenesis of a number of chronic inflammatory diseases. Several reports have shown that genetic variants of genes related to PRRs such as TLR4 and CD14 are associated with susceptibility to both diseases [10, 11, 25–27]. The present study adds further evidence supporting the involvement of macrophage PRRs in the development of sarcoidosis as a chronic inflammatory lung disease.
Of the SNPs examined, three SNPs (rs26777637, rs2253120 and rs692427) showed tendency for association with sarcoidosis (P = 0.02, P = 0.011, P = 0.042), but this association did not reach significance after the Bonferroni correction. However, associations of rs691005 remained significant even after Bonferroni correction (P = 0.001). In addition, power calculations based on study subjects of 181 cases and 424 controls, OR of 2.53 showed a sufficient genetic power (0.81) at the level of significance of 0.005. As the sample size of this study is not sufficiently large and is restricted to Japanese population, the present data should be validated in larger samples and in other ethnic groups.
This study suggests that the MRC1 gene may represent an important susceptibility locus for sarcoidosis at chromosome 10p12 and genetic variants in MRC1 may play significant roles in the pathogenesis of sarcoidosis. Importantly, the association we observed between MRC1 polymorphisms and sarcoidosis adds further evidence for the involvement of macrophage PRRs in the development of a number of chronic inflammatory diseases, including sarcoidosis. However, further studies are clearly needed to achieve a comprehensive coverage of genetic variants in and around the MRC1 gene, in order to identify causal variants conferring susceptibility to an increased risk of sarcoidosis.
We gratefully acknowledge the numerous sample donors for making this work possible.
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