Journal List > J Rheum Dis > v.23(2) > 1064308

Kim, Kim, Chae, Lee, Lim, Sheen, Chung, and Shim: ADAM33 Polymorphisms Are Associated with Susceptibility to Systemic Lupus Erythematosus in a Korean Population

Abstract

Objective

The objective of this study is to assess whether genetic functional variants of disintegrin and metalloprotease 33 (ADAM33) are associated with susceptibility to systemic lupus erythematosus (SLE) in a Korean population.

Methods

We previously identified 48 single nucleotide polymorphisms (SNPs) in ADAM33. Six SNPs were selected with regard to the linkage disequilibrium pattern. An association study of ADAM33 was conducted in 190 patients with SLE and 469 control subjects. SNPs were genotyped using the TaqMan Real-time polymerase chain reaction method, and haplotype analyses of related variants were performed.

Results

All SNPs were in Hardy-Weinberg equilibrium. Significant associations were found between the ADAM33 polymorphisms and SLE at rs2787094 (adjusted odds ratio [OR] 1.88, 95% confidence interval [CI] 1.00 to 3.54; p< 0.0001). The rs554743 polymorphism was associated with the presence of the immunoglobulin M anti-cardiolipin antibody (adjusted OR 0.29, 95% CI 0.10 to 0.83; p=0.021).

Conclusion

ADAM33 polymorphisms were associated with susceptibility to SLE and development of clinical disease manifestations in a Korean population. Further study is warranted to clarify the role of ADAM33 in SLE pathogenesis.

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Figure 1.
Linkage disequilibrium pattern in the ADAM33 gene.
jrd-23-88f1.tif
Table 1.
Clinical characteristics of the study subjects
Clinical profile SLE RA Control
No. of subject 190 490 469
Age (yr) 36.3±11.6 38.7±12.1 38.3±10.4
Sex (male/female) 1/20.1 1/3.2 1/1.1
Disease duration (yr) 6.7±4.04 7.1±4.21 -
ACR criteria      
Malar rash 107 (56.4)    
Discoid rash 6 (3.0)    
Photosensitivity 75 (39.3)    
Oral ulcers 62 (32.7)    
Arthritis 93 (48.8)    
Serositis 57 (30.3)    
Renal involvement 76 (40.0)    
CNS involvement 9 (5.0)    
Hematologic abnormities 171 (90.0)    
Immunologic abnormalities 114 (60.0)    
Antinuclear antibodies 190 (100.0)    

Values are presented as number only, mean±standard deviation, or number (%). ACR: American College of Rheumatology, CNS: central nervous system, RA: rheumatoid arthritis, SLE: systemic lupus erythematosus.

Table 2.
Basic information on the genotyped single nucleotide polymorphisms (SNPs) in the ADAM33 gene
SNP No. NCBI rs No. Chromosome position* e Location Base change Amino acid MAF HWE Success rate (%)
JPT CHB SLE control
1 rs554743 3662142 Intron1 A> G   0.43 0.39 0.403 0.382 0.602 92.39
2 rs3918395 3653149 Intron13 G> T   0.13 0.09 0.082 0.073 1 95.52
3 rs528557 3651742 Exon19 G> C Gly717Gly 0.27 0.20 0.236 0.234 0.135 92.99
4 rs2280091 3650234 Exon20 T> C Met764Thr 0.14 0.09 0.063 0.068 1 97.01
5 rs2280090 3650205 Exon20 C> T Pro774Ser 0.16 0.11 0.060 0.077 0.670 95.37
6 rs2787094 3649161 3'UTR C> G   0.28 0.40 0.367 0.337 0.591 93.88

CHB: Han Chinese in Bejing, China, JPT: Japanese in Tokyo, Japan; MAF: minor allele frequency, NCBI: National Center fo Biotechnology Information, SLE: systemic lupus erythematosus, UTR: untranslated region.

* SNP position from the NCBI dbSNP (http://www.ncbi.nlm.nih.gov/snp).

HWE indicates the p-value for the Hardy-Weinberg equilibrium in normal controls.

Table 3.
Genotypic and allelic analysis of the ADAM33 gene polymorphisms in the controls and patients with SLE or RA (disease control)
SNP No. NCBI rs No. Genotype Control SLE Adjusted OR (95% CI) p-value* (control vs. SLE) p-value* (control vs. RA)
1 rs554743 Total (AA, AG, GG) 429 (100.0) 190 (100.0)     487
    AA 165 (38.5) 62 (32.6) 1.00 (reference) 0.796 0.616
    AG 200 (46.6) 97 (51.1) 1.13 (0.69∼1.87)    
    GG 64 (14.9) 31 (16.3) 0.93 (0.48∼1.80)    
    AG/GG vs. AA 264 (61.5) 128 (67.4) 1.07 (0.67∼1.72) 0.768 0.650
    AA/AG vs. GG 365 (85.1) 159 (83.7) 0.87 (0.48∼1.57) 0.637 0.502
    G allele freq. 0.382 0.403 1.09 (0.12∼0.87) 0.459 0.271
2 rs3918395 Total (GG, GT, TT) 462 (100.0) 178 (100.0)     485
    GG 389 (84.2) 156 (87.6) 1.00 (reference) 0.801 1.000
    GT 71 (15.4) 19 (10.7) 0.83 (0.43∼1.59)    
    TT 2 (0.4) 3 (1.7) 1.41 (0.16∼12.20)    
    GT/TT vs. GG GG/GT vs. TT 73 (15.8) 460 (99.6) 22 (12.4) 175 (98.3) 0.86 (0.46∼1.61) 1.44 (0.17∼12.46) 0.641 0.740 0.990 0.997
    T allele freq. 0.074 0.082 1.12 (0.74∼1.69) 0.588 0.482
3 rs528557 Total (GG, GC, CC) 463 (100.0) 160 (100.0)     477
    GG 274 (59.2) 98 (61.3) 1.00 (reference) 0.864 0.281
    GC 156 (33.7) 52 (32.5) 0.87 (0.53∼1.43)    
    CC 33 (7.1) 10 (6.3) 0.97 (0.38∼2.45)    
    GC/CC vs. GG 189 (40.8) 62 (38.8) 0.89 (0.56∼1.42) 0.618 0.914
    GG/GC vs. CC 430 (92.9) 150 (93.8) 1.02 (0.41∼2.54) 0.969 0.122
    C allele freq. 0.234 0.237 1.02 (0.78∼1.32) 0.913 0.810
4 rs2280091 Total (AA, AG, GG) 457 (100.0) 192 (100.0)     487
    TT 389 (85.1) 178 (92.7) 1.00 (reference) 0.172 0.864
    TC 66 (14.4) 13 (6.8) 0.50 (0.24∼1.05)    
    CC 2 (0.4) 1 (0.5) 0.52 (0.04∼7.72)    
    TC/CC vs. TT 68 (14.9) 14 (7.3) 0.50 (0.25∼1.03) 0.061 0.603
    TT/TC vs. CC 389 (85.1) 191 (99.5) 2.04 (0.14∼30.29) 0.604 0.985
    C allele freq. 0.069 0.063 0.92 (0.59∼1.43) 0.702 0.282
5 rs2280090 Total (AA, AG, GG) 449 (100.0) 190 (100.0)     489
    CC 379 (84.4) 177 (93.2) 1.00 (reference) 0.141 0.245
    CT 68 (15.1) 12 (6.3) 0.47 (0.22∼1.01)    
    TT 2 (0.4) 1 (0.5) 1.89 (0.06∼56.43)    
    CT/TT vs. CC 70 (15.6) 13 (6.8) 0.50 (0.24∼1.05) 0.066 0.147
    CC/CT vs. TT 447 (99.6) 189 (99.5) 2.02 (0.07∼60.49) 0.684 0.250
    T allele freq. 0.077 0.060 0.77 (0.50∼1.19) 0.235 0.348
6 rs2787094 Total (CC, CG, GG) 445 (100.0) 184 (100.0)     489
    CC 186 (41.8) 91 (49.5) 1.00 (reference) 0.000 0.913
    CG 211 (47.4) 48 (26.1) 0.36 (0.21∼0.61)    
    GG 48 (10.8) 45 (24.5) 1.88 (1.00∼3.54)    
    CG/GG vs. CC 259 (58.2) 93 (50.5) 0.63 (0.40∼1.00) 0.048 0.970
    CC/CG vs. GG 397 (89.2) 139 (75.5) 2.09 (1.60∼5.26) 0.000 0.970
    G allele freq. 0.338 0.368 1.14 (0.90∼1.44) 0.266 0.768

Values are presented as number only or number (%). CI: confidence interval, freq.: frequency, NCBI: National Center for Biotechnology Information, OR: odds ratio, RA: rheumatoid arthritis, SLE: systemic lupus erythematosus, SNP: single nucleotide polymorphism.

* Sex and age adjusted.

Table 4.
Genotype frequencies of the ADAM33 polymorphisms in dominant phenotypic model for patients with SLE
Phenotype NCBI rs No.
rs554743 rs3918395 rs528557 rs2280091 rs2280090 rs2787094
Adjusted OR (95% CI) p-value Adjusted OR (95% CI) p-value Adjusted OR (95% CI) p-value Adjusted OR (95% CI) p-value Adjusted OR (95% CI) p-value Adjusted OR (95% CI) p-value
Sm 0.90(0.10∼1.79) 0.790 0.83(0.20∼3.38) 0.791 1.60(0.65∼3.91) 0.302 0.59(0.06∼5.55) 0.646 - 0.999 0.83(0.39∼1.77) 0.638
RNP 2.10(0.97∼4.59) 0.061 0.56(0.17∼1.84) 0.343 0.98(0.42∼2.26) 0.973 1.05(0.21∼5.23) 0.952 0.88(0.15∼4.93) 0.890 1.18(0.56∼2.48) 0.651
Ro 1.58(0.75∼3.35) 0.232 0.89(0.26∼3.00) 0.859 1.24(0.54∼2.83) 0.601 1.28(0.22∼7.18) 0.777 0.95(0.15∼5.72) 0.955 1.37(0.67∼2.18) 0.382
La 1.29(0.54∼3.09) 0.562 0.19(0.02∼1.65) 0.135 0.44(0.16∼1.18) 0.104 - 0.999 - 0.999 1.49(0.66∼3.37) 0.336
Anticoagulant 1.21(0.39∼3.71) 0.728 1.98(0.46∼8.49) 0.353 0.60(0.19∼1.91) 0.394 3.10(0.48∼9.95) 0.233 2.66(0.41∼6.95) 0.299 1.45(0.52∼4.03) 0.475
IgG aCL 0.70(0.26∼1.93) 0.501 2.31(0.62∼8.58) 0.211 0.96(0.35∼2.65) 0.947 0.87(0.09∼8.01) 0.903 1.00(0.10∼9.63) 0.995 1.47(0.57∼3.81) 0.424
IgM aCL 0.29(0.10∼0.83) 0.021 0.92(0.18∼4.67) 0.927 0.26(0.19∼1.98) 0.425 1.17(0.12∼0.96) 0.887 1.39(0.14∼3.54) 0.777 1.07(0.39∼2.88) 0.892
Malar rash 1.11(0.54∼2.24) 0.771 1.45(0.49∼4.21) 0.494 1.07(0.51∼2.23) 0.857 0.61(0.13∼2.77) 0.526 0.44(0.08∼2.47) 0.354 0.892(0.46∼1.73) 0.738
Serositis 1.56(0.71∼3.41) 0.265 0.68(0.20∼2.30) 0.539 0.58(0.25∼1.34) 0.206 0.29(0.03∼2.51) 0.263 0.33(0.03∼2.98) 0.329 0.85(0.42∼1.72) 0.653
Nephritis 0.36(0.31∼1.30) 0.215 0.51(0.15∼1.72) 0.284 0.91(0.43∼1.94) 0.823 0.23(0.02∼1.96) 0.179 - 0.999 1.10(0.57∼2.12) 0.776
Hemolyticanemia 1.43(0.55∼3.70) 0.465 0.73(0.15∼3.54) 0.699 1.11(0.43∼2.84) 0.827 - 0.999 - 0.999 1.09(0.46∼2.57) 0.840
Leukopenia 0.96(0.48∼1.97) 0.945 0.90(0.31∼2.61) 0.854 1.09(0.52∼2.25) 0.817 0.41(0.09∼1.83) 0.244 0.27(0.05∼1.52) 0.140 1.18(0.61∼2.28) 0.614
Lymphopenia 0.36(1.10∼1.48) 0.165 3.8(0.41∼34.63) 0.236 1.31(0.39∼4.32) 0.656 1.47(0.14∼5.06) 0.744 1.37(0.13∼4.57) 0.790 0.79(0.26∼2.42) 0.685
Thrombocytopenia 1.19(0.58∼2.41) 0.630 1.59(0.56∼4.53) 0.380 1.71(0.81∼3.58) 0.153 1.74(0.40∼7.44) 0.455 0.24(0.26∼5.97) 0.783 0.72(0.37∼1.40) 0.337

aCL: anti-cardiolipin antibodies, CI: confidence interval, Ig: immunoglobulin, NCBI: National Center for Biotechnology Information, OR: odds ratio, RNP: ribonucleoprotein, SLE: systemic lupus erythematosus.

Table 5.
The distribution of rs554743 genotype in SLE patient with IgM aCL feature
Genotype IgM aCL p-value OR (95% CI)
Negative Positive
AA 30 (27.5) 10 (52.6) 0.021 0.293 (0.103∼0.831)
AG/GG 79 (72.5) 9 (47.4)    

Values are presented as number (%). aCL: anti-cardiolipin antibodies, CI: confidence interval, IgM: immunoglobulin M, OR: odds ratio, SLE: systemic lupus erythematosus.

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