PLD4 as a novel susceptibility gene for systemic sclerosis in a Japanese population

Chikashi Terao, Koichiro Ohmura, Yasushi Kawaguchi, Tetsuya Nishimoto, Aya Kawasaki, Kazuhiko Takehara, Hiroshi Furukawa, Yuta Kochi, Yuko Ota, Katsunori Ikari, Shinichi Sato, Shigeto Tohma, Ryo Yamada, Kazuhiko Yamamoto, Michiaki Kubo, Hisashi Yamanaka, Masataka Kuwana, Naoyuki Tsuchiya, Fumihiko Matsuda, Tsuneyo Mimori

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38 Citations (Scopus)

Abstract

Objective Systemic sclerosis (SSc) is an autoimmune disease for which multiple susceptibility genes have been reported. Genome-wide association studies have shown that large numbers of susceptibility genes are shared among autoimmune diseases. Recently, our group identified 9 novel susceptibility genes associated with rheumatoid arthritis (RA) in a Japanese population. The aim of this study was to elucidate whether the 18 genes that displayed associations or suggestive associations for RA in our previous study are associated with SSc in Japanese. Methods We performed an association study that included 415 patients with SSc and 16,891 control subjects, followed by a replication study that included 315 patients and 21,054 control subjects. The 18 markers reported to display association with RA were analyzed for their associations with SSc in the first study, and 5 markers were further analyzed in the replication study. The inverse variance method was used to evaluate the associations of these markers with SSc in a combined study. Results In the phospholipase D4 gene (PLD4), rs2841277 displayed a significant association with SSc in Japanese patients (P = 0.00017). We observed that rs2841280 in exon 2 of PLD4 was in strong linkage disequilibrium with rs2841277 and introduced an amino acid alteration. We also observed associations between SSc and rs6932056 in TNFAIP3 and rs2280381 in IRF8 (P = 0.0000095 and P = 0.0030, respectively), both of which displayed associations with SSc in a European population. Conclusion We determined that PLD4 is a novel susceptibility gene for SSc in Japanese, thus confirming the involvement of PLD4 in autoimmunity. Associations between SSc and TNFAIP3 or IRF8 were also detected in our Japanese population. SSc and RA appear to share relatively large proportions of their genetic backgrounds.

Original languageEnglish
Pages (from-to)472-480
Number of pages9
JournalArthritis and Rheumatism
Volume65
Issue number2
DOIs
Publication statusPublished - 01-02-2013

All Science Journal Classification (ASJC) codes

  • Immunology and Allergy
  • Rheumatology
  • Immunology
  • Pharmacology (medical)

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    Terao, C., Ohmura, K., Kawaguchi, Y., Nishimoto, T., Kawasaki, A., Takehara, K., Furukawa, H., Kochi, Y., Ota, Y., Ikari, K., Sato, S., Tohma, S., Yamada, R., Yamamoto, K., Kubo, M., Yamanaka, H., Kuwana, M., Tsuchiya, N., Matsuda, F., & Mimori, T. (2013). PLD4 as a novel susceptibility gene for systemic sclerosis in a Japanese population. Arthritis and Rheumatism, 65(2), 472-480. https://doi.org/10.1002/art.37777