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논문 기본 정보

자료유형
학술저널
저자정보
Kim Ju Yeong (Department of Environmental Medical Biology Institute of Tropical Medicine Arthropods of Medical Im) Yi Myung-Hee (Department of Environmental Medical Biology Institute of Tropical Medicine Arthropods of Medical Im) Kim Myungjun (Department of Environmental Medical Biology Institute of Tropical Medicine Arthropods of Medical Im) Yeom Joon Sup (Department of Internal Medicine Yonsei University College of Medicine Seoul Korea.AIDS research Ins) Yoo Hyun Dong (Department of Neurosurgery Eulji University Hospital College of Medicine Eulji University Daejeon K) Kim Seong Min (Department of Neurosurgery Eulji University Hospital College of Medicine Eulji University Daejeon K) Yong Tai-Soon (Department of Environmental Medical Biology Institute of Tropical Medicine Arthropods of Medical Im)
저널정보
대한진단검사의학회 Annals of Laboratory Medicine Annals of Laboratory Medicine 제42권 제2호
발행연도
2022.3
수록면
196 - 202 (7page)
DOI
10.3343/alm.2022.42.2.196

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Background: Identifying the causal pathogen of encephalitis remains a clinical challenge. A 50-year-old man without a history of neurological disease was referred to our department for the evaluation of an intracranial lesion observed on brain magnetic resonance imaging (MRI) scans, and the pathology results suggested protozoal infection. We identified the species responsible for encephalitis using thymine–adenine (TA) cloning, suitable for routine clinical practice. Methods: We extracted DNA from a paraffin-embedded brain biopsy sample and performed TA cloning using two universal eukaryotic primers targeting the V4-5 and V9 regions of the 18S rRNA gene. The recombinant plasmids were extracted, and the inserted amplicons were identified by Sanger sequencing and a homology search of sequences in the National Center for Biotechnology Information Basic Local Alignment Search Tool. Results: The infection was confirmed to be caused by the free-living amoeba Balamuthia mandrillaris. Two of 41 colonies recombinant with 18S V4-5 primers and 35 of 63 colonies recombinant with the 18S V9 primer contained B. mandrillaris genes; all other colonies contained human genes. Pathogen-specific PCR ruled out Entamoeba histolytica, Naegleria fowleri, Acanthamoeba spp., and Toxoplasma gondii infections. Conclusions: This is the first report of B. mandrillaris-induced encephalitis in Korea based on molecular identification. TA cloning with the 18S rRNA gene is a feasible and affordable diagnostic tool for the detection of infectious agents of unknown etiology.

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