Identification of Novel Genetic Susceptibility Loci in African American Lupus Patients in a Candidate Gene Association Study

作者：Sanchez Elena; Comeau Mary E; Freedman Barry I; Kelly Jennifer A; Kaufman Kenneth M; Langefeld Carl D; Brown Elizabeth E; Alarcon Graciela S; Kimberly Robert P; Edberg Jeffrey C; Ramsey Goldman Rosalind; Petri Michelle; Reveille John D; Vila Luis M; Merrill Joan T; Tsao Betty P; Kamen Diane L; Gilkeson Gary S; James Judith A; Vyse Timothy J; Gaffney Patrick M; Jacob Chaim O; Niewold Timothy B; Richardson Bruce C; Harley John B

来源：Arthritis and Rheumatism, 2011, 63(11): 3493-3501.

DOI：10.1002/art.30563

Objective. Candidate gene and genome-wide association studies have identified several disease susceptibility loci in lupus patients. These studies have largely been performed in lupus patients who are Asian or of European ancestry. This study was undertaken to examine whether some of these same susceptibility loci increase lupus risk in African American individuals.
Methods. Single-nucleotide polymorphisms tagging 15 independent lupus susceptibility loci were genotyped in a set of 1,724 lupus patients and 2,024 healthy controls of African American descent. The loci examined included PTPN22, FCGR2A, TNFSF4, STAT4, CTLA4, PDCD1, PXK, BANK1, MSH5 (HLA region), CFB (HLA region), C8orf13-BLK region, MBL2, KIAA1542, ITGAM, and MECP2/IRAK1.
Results. We found the first evidence of genetic association between lupus in African American patients and 5 susceptibility loci (C8orf13-BLK, BANK1, TNFSF4, KIAA1542, and CTLA4; P = 8.0 x 10(-6), P = 1.9 x 10(-5), P = 5.7 x 10(-5), P = 0.00099, and P = 0.0045, respectively). Further, we confirmed the genetic association between lupus and 5 additional lupus susceptibility loci (ITGAM, MSH5, CFB, STAT4, and FCGR2A; P = 7.5 x 10(-11), P = 5.2 x 10(-8), P = 8.7 x 10(-7), P = 0.0058, and P = 0.0070, respectively), and provided evidence, for the first time, of genome-wide significance for the association between lupus in African American patients and ITGAM and MSH5 (HLA region).
Conclusion. These findings provide evidence of novel genetic susceptibility loci for lupus in African Americans and demonstrate that the majority of lupus susceptibility loci examined confer lupus risk across multiple ethnicities.

• 出版日期2011-11
• 单位西北大学