MALDI-TOF MS의 임상검사실 내 적용과 미생물검사의 패러다임 변화
MALDI-TOF MS: Its Application in the Clinical Laboratory and a Paradigm Shift in Clinical Microbiology
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초록
지난 10여 년에 걸쳐, 임상미생물분야는 미생물 동정에 있어 다소 느린 전통적인 동정 알고리즘에서 신속히 결과를 확인할 수 있는 분자진단학적 방법 또는 질량분석법으로의 혁신적인 변화를 겪고 있다. 일찍이, 질량분석법은 임상화학검사실에서의 단백기반 시료 분석법으로 적용되어 왔다. 최근, matrix-assisted laser desorption ionization-time of flight (MALDI-TOF) 원리를 이용한 질량분석법이 미생물검사실에 도입되면서 미생물 동정에 있어 신속, 정확한 미생물 동정결과를 제공할 수 있게 되었다. 널리 알려진 제조사의 제품으로 2가지 장비 플랫폼이 기존의 표현형을 통한 동정 자동화 장비를 대체하고 있으며, 일부 경우에서는 염기서열 기반 동정기법 대신으로도 사용되고 있다. 이 종설은 임상연구나 임상미생물검사에 있어 MALDI-TOF 질량분석법의 현재 상황을 요약하고, 시료 처리, 분석 알고리즘, 해석 및 한계를 분석한 최근 연구들을 소개하고자 한다. 또한, 현재 상용화된 MALDI-TOF 질량분석기와 그 분석 소프트웨어에 대해서도 다룰 것이다. 마지막으로, 임상검사실에서 이러한 신규 검사법들의 잠재능력을 개발하기 위해 끊임없이 노력하고 개발자들과의 협력관계를 공고히 한다면 MALDI-TOF 질량분석법을 비롯한 새로운 기술에 있어 향후 진단 분야에서의 용도를 새롭게 정의할 수 있을 것이다.
Abstract
In the past decade, clinical microbiology underwent revolutionary changes in methods used to identify microorganisms, a transition from slow and traditional microbial identification algorithms to rapid molecular methods and mass spectrometry (MS). Earlier, MS was clinically used as a highly complex method that was adapted for protein-centered analysis of samples in chemistry laboratories. Recently, a paradigm-shift happened when matrix-assisted laser desorption ionization-time of flight (MALDI-TOF) MS was implemented to be used in microbiology laboratories for rapid and robust methods for accurate microbial identification. Two instrument platforms, marketed by well-established manufacturers, are beginning to displace automated phenotypic identification instruments and in some cases even genetic sequence-based identification practices. This review summarizes the current role of MALDI-TOF MS in clinical research, in diagnostic clinical microbiology laboratories, and serves as an introduction to MALDI-TOF MS, highlighting research associated with sample preparation, algorithms, interpretations, and limitations. Currently available MALDI-TOF MS instruments as well as software platforms that support the use of MALDI-TOF with direct specimens have been discussed in this review. Finally, clinical laboratories are consistently striving to extend the potential of these new methods, often in partnership with developmental scientists, resulting in novel technologies, such as MALDI-TOF MS, which could shape and define the diagnostic landscape for years to come.
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