Partial Interferon-γ Receptor Deficiency in Patients with Disseminated Tuberculosis

파종성 결핵 환자에서 interferon-γ 수용체의 부분결핍에 관한 연구

  • Hwang, Jung Hye (Division of Pulmonary and Critical Care Medicine, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine) ;
  • Koh, Won-Jung (Division of Pulmonary and Critical Care Medicine, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine) ;
  • Lee, Shin Hye (Division of Pulmonary and Critical Care Medicine, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine) ;
  • Kim, Eun Joo (Division of Pulmonary and Critical Care Medicine, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine) ;
  • Kang, Eun Hae (Division of Pulmonary and Critical Care Medicine, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine) ;
  • Suh, Gee Young (Division of Pulmonary and Critical Care Medicine, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine) ;
  • Chung, Man Pyo (Division of Pulmonary and Critical Care Medicine, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine) ;
  • Kim, Hojoong (Division of Pulmonary and Critical Care Medicine, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine) ;
  • Kwon, O Jung (Division of Pulmonary and Critical Care Medicine, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine)
  • 황정혜 (성균관대학교 의과대학 내과학교실, 삼성서울병원 호흡기내과) ;
  • 고원중 (성균관대학교 의과대학 내과학교실, 삼성서울병원 호흡기내과) ;
  • 이신혜 (성균관대학교 의과대학 내과학교실, 삼성서울병원 호흡기내과) ;
  • 김은주 (성균관대학교 의과대학 내과학교실, 삼성서울병원 호흡기내과) ;
  • 강은해 (성균관대학교 의과대학 내과학교실, 삼성서울병원 호흡기내과) ;
  • 서지영 (성균관대학교 의과대학 내과학교실, 삼성서울병원 호흡기내과) ;
  • 정만표 (성균관대학교 의과대학 내과학교실, 삼성서울병원 호흡기내과) ;
  • 김호중 (성균관대학교 의과대학 내과학교실, 삼성서울병원 호흡기내과) ;
  • 권오정 (성균관대학교 의과대학 내과학교실, 삼성서울병원 호흡기내과)
  • Received : 2004.08.30
  • Accepted : 2004.12.21
  • Published : 2005.01.30

Abstract

Background : Interferon-gamma ($IFN-{\gamma}$) is essential in the immune response to mycobacterial infections, and a complete or partial deficiency in the $IFN-{\gamma}$ receptor 1 ($IFN{\gamma}R1$) or the $IFN-{\gamma}$ receptor 2 ($IFN{\gamma}R2$) have been reported to confer susceptibility to a disseminated infection with nontuberculous mycobacteria. However, similar mutations in the $IFN-{\gamma}$ receptor have not been specifically examined in the patients with clinical tuberculosis. Methods : This study searched for mutations in the $IFN-{\gamma}$ receptor gene that resulted in a partial $IFN-{\gamma}$ receptor deficiency in six patients with disseminated tuberculosis. The previously identified $IFN{\gamma}R1$ and $IFN{\gamma}R2$ coding regions were sequenced after amplification. Results : There was no partial $IFN{\gamma}R1$ deficiency including a homozygous recessive missense mutation causing an amino-acid substitution in the extracellular domain of the receptor (I87T) and a hotspot for small deletions (818delT, 818del4, 818insA) found in any of the patients. In addition, a partial $IFN{\gamma}R2$ deficiency of the homozygous missense mutation (R114C) was not found in any of the patients. Conclusion : Genetic defects causing a partial $IFN-{\gamma}$ receptor deficiency were not identified in our patients with disseminated tuberculosis.

연구배경 : 결핵의 발병에 유전적인 소인이 존재하며 숙주 면역 반응에 $IFN-{\gamma}$가 중요한 역할을 한다고 알려져 있다. 파종성 NTM 또는 BCG 감염증 환자에서 $IFN-{\gamma}$ 수용체 유전자 돌연변이가 밝혀져 있는데, 결핵 환자에서 $IFN-{\gamma}$ 수용체의 부분결핍 유무는 잘 알려져 있지 않았다. 방 법 : 2개 이상의 장기를 침범한 파종성 결핵 환자 6명을 대상으로 염기순서분석을 통해 $IFN-{\gamma}$ 수용체 1과 $IFN-{\gamma}$ 수용체 2의 부분결핍을 초래하는 유전자 이상이 있는지를 살펴보았다. 결 과 : $IFN-{\gamma}R1$의 부분결핍을 초래하는 I87T와 818delT 818del4, 818insA 그리고 $IFN-{\gamma}R2$의 부분결핍을 초래하는 R114C 돌연변이 등 기존에 보고된 유전자 이상은 발견되지 않았다. 결 론 : 본 연구의 대상인 6명의 파종성 결핵 환자에서 $IFN-{\gamma}$ 수용체의 부분결핍을 초래하는 유전자 이상은 발견되지 않았다.

Keywords

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