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).
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Table 1.
Table 2.
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).
† MAF from http://browser.1000genomes.org/.
Table 3.
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 |