16S Ribosomal RNA, Heat-shock Protein 65 및 RNA Polymerase-Subunit 유전자 염기서열분석을 통한 비결핵 마이코박테리아의 동정
Identification of Nontuberculous Mycobacteria by Sequence Analysis of the 16S RibosomalRNA, the Heat-shock Protein 65 and the RNA Polymerase -Subunit Genes
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배경 : 비결핵 마이코박테리아(NTM)는 환경분포균으로 환자검체에서 분리되는 경우라도 질환과 관계없는 오염균으로 생각하기 쉽고, 일반적인 미생물학적 동정방법으로는 정확한 동정이 어렵다. 이에 저자들은 임상검체에서 배양된 NTM에 대하여 염기서열분석법으로 정확하게 동정하여 균종 분포를 연구하고자 하였다.방법 : 2003년 1월 21부터 2004년 1월 20일까지 일개 3차 의료기관의 결핵검사실에서 배양된 균주 중에서 결핵균 소식자에 음성인 NTM를 대상으로 하였다. 이들 중 집락이 10개 이상 배양되거나 10집락 미만이라도 동일 환자에서 두번 이상 배양된 97개에서16S rRNA, hsp65 및 rpoB 유전자 서열을 분석하였고, 결핵연구원의 결과를 포함하여 120환자에서 균종 분포를 연구하였다.결과 : 임상검체에서 배양된 NTM 균종은 M. avium , M. in-tracellulare, M. abscessus가 각 30.8%, 23.3%, 18.3%를 차지16S rRNA, hsp65 및 rpoB를 이용한 NTM동정 159하였다. 이외에 M. gordonae,M. senegalense,M. fortuitum,M.peregrinum, M. kansasii, M. terrae complex, M. lentiflavum,M. chelonae, M. szulgai가 분리되었고 MTB complex도 2.5%에서 확인되었다. 유전자별 동정 성공률은 16S rRNA, rpoB, hsp65각 65%, 82%, 87%로써, NTM을 염기서열분석법으로 동정할 때에는 5’-16S rDNA보다는 hsp65나 rpoB를 이용하는 것이 성공률을 높일 수 있었다.
Abstract
U-9, P.170.
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