A loop-mediated isothermal amplification assay for the detection and quantification of JC polyomavirus in cerebrospinal fluid: a diagnostic and clinical management tool and technique for progressive multifocal leukoencephalopathy
Abstract Background JC polyomavirus (JCV) is the causative agent of progressive multifocal leukoencephalopathy (PML), a demyelinating disease of the central nervous system in immunosuppressed patients. PML usually has a poor prognosis. Detection and quantification of the JCV genome in cerebrospinal...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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BMC
2018-08-01
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| Series: | Virology Journal |
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| Online Access: | http://link.springer.com/article/10.1186/s12985-018-1046-z |
| _version_ | 1819110744019435520 |
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| author | Hitomi Kinoshita Kazuo Nakamichi Chang-Kweng Lim Mutsuyo Takayama-Ito Lixin Wang Itoe Iizuka Ichiro Kurane Masayuki Saijo |
| author_facet | Hitomi Kinoshita Kazuo Nakamichi Chang-Kweng Lim Mutsuyo Takayama-Ito Lixin Wang Itoe Iizuka Ichiro Kurane Masayuki Saijo |
| author_sort | Hitomi Kinoshita |
| collection | DOAJ |
| description | Abstract Background JC polyomavirus (JCV) is the causative agent of progressive multifocal leukoencephalopathy (PML), a demyelinating disease of the central nervous system in immunosuppressed patients. PML usually has a poor prognosis. Detection and quantification of the JCV genome in cerebrospinal fluid (CSF) is an efficacious tool for the diagnosis and management of PML, for which proper therapeutic interventions are required. Methods A loop-mediated isothermal amplification (LAMP) assay was applied for the quantitative detection of JCV. The LAMP assay was evaluated for the efficacy in diagnosis of PML in comparison with the TaqMan-based quantitative real-time PCR (qPCR) assay using 153 CSF specimens collected from patients with suspected PML. Results The LAMP assay showed no cross-reactivity against other polyomavirus plasmids, viral DNA, and viral RNA, which causes encephalitis, and detected 1 copy of the standard DNA per reaction. Among 50 qPCR-positives, 42 specimens (containing JCV genome ranged from 3.2 × 100 to 3.2 × 106 copies/reaction) showed positive reactions and 8 specimens (containing 0.9 to 19.9 copies/reaction) showed negative in the LAMP assay. Furthermore, 3 of 103 qPCR-negative specimens showed positive reactions in the LAMP assay. The sensitivity, specificity, positive predictive value, and negative predictive values of the LAMP assay were 84% (42/50), 97% (100/103), 93% (42/45), and 93% (100/108), respectively. The kappa statistic was 0.83. The JCV loads determined by the LAMP assay showed a strong positive correlation with those determined by the qPCR assay for 33 specimens with copy numbers of ≥1 copies/reaction (r = 0.89). Additionally, the LAMP assay could monitor the JCV genome copy number in CSF for sequential samples equivalently to qPCR assay. Conclusions The newly developed LAMP assay is highly specific against JCV and detect the JCV genome in the sample DNA containing 20 or more copies of JCV genome per reaction with 100% sensitivity (n = 29), which corresponds to ≥3 × 103 copies/mL of CSF. The LAMP assay is useful for the diagnosis and offers valuable information for the evaluation and management of PML in the clinical setting. |
| first_indexed | 2024-12-22T03:46:35Z |
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| id | doaj.art-a2545ed356524ae6bb23a8865de86c32 |
| institution | Directory Open Access Journal |
| issn | 1743-422X |
| language | English |
| last_indexed | 2024-12-22T03:46:35Z |
| publishDate | 2018-08-01 |
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| spelling | doaj.art-a2545ed356524ae6bb23a8865de86c322022-12-21T18:40:07ZengBMCVirology Journal1743-422X2018-08-0115111110.1186/s12985-018-1046-zA loop-mediated isothermal amplification assay for the detection and quantification of JC polyomavirus in cerebrospinal fluid: a diagnostic and clinical management tool and technique for progressive multifocal leukoencephalopathyHitomi Kinoshita0Kazuo Nakamichi1Chang-Kweng Lim2Mutsuyo Takayama-Ito3Lixin Wang4Itoe Iizuka5Ichiro Kurane6Masayuki Saijo7Department of Virology 1, National Institute of Infectious DiseasesDepartment of Virology 1, National Institute of Infectious DiseasesDepartment of Virology 1, National Institute of Infectious DiseasesDepartment of Virology 1, National Institute of Infectious DiseasesDepartment of Virology 1, National Institute of Infectious DiseasesDepartment of Virology 1, National Institute of Infectious DiseasesDepartment of Virology 1, National Institute of Infectious DiseasesDepartment of Virology 1, National Institute of Infectious DiseasesAbstract Background JC polyomavirus (JCV) is the causative agent of progressive multifocal leukoencephalopathy (PML), a demyelinating disease of the central nervous system in immunosuppressed patients. PML usually has a poor prognosis. Detection and quantification of the JCV genome in cerebrospinal fluid (CSF) is an efficacious tool for the diagnosis and management of PML, for which proper therapeutic interventions are required. Methods A loop-mediated isothermal amplification (LAMP) assay was applied for the quantitative detection of JCV. The LAMP assay was evaluated for the efficacy in diagnosis of PML in comparison with the TaqMan-based quantitative real-time PCR (qPCR) assay using 153 CSF specimens collected from patients with suspected PML. Results The LAMP assay showed no cross-reactivity against other polyomavirus plasmids, viral DNA, and viral RNA, which causes encephalitis, and detected 1 copy of the standard DNA per reaction. Among 50 qPCR-positives, 42 specimens (containing JCV genome ranged from 3.2 × 100 to 3.2 × 106 copies/reaction) showed positive reactions and 8 specimens (containing 0.9 to 19.9 copies/reaction) showed negative in the LAMP assay. Furthermore, 3 of 103 qPCR-negative specimens showed positive reactions in the LAMP assay. The sensitivity, specificity, positive predictive value, and negative predictive values of the LAMP assay were 84% (42/50), 97% (100/103), 93% (42/45), and 93% (100/108), respectively. The kappa statistic was 0.83. The JCV loads determined by the LAMP assay showed a strong positive correlation with those determined by the qPCR assay for 33 specimens with copy numbers of ≥1 copies/reaction (r = 0.89). Additionally, the LAMP assay could monitor the JCV genome copy number in CSF for sequential samples equivalently to qPCR assay. Conclusions The newly developed LAMP assay is highly specific against JCV and detect the JCV genome in the sample DNA containing 20 or more copies of JCV genome per reaction with 100% sensitivity (n = 29), which corresponds to ≥3 × 103 copies/mL of CSF. The LAMP assay is useful for the diagnosis and offers valuable information for the evaluation and management of PML in the clinical setting.http://link.springer.com/article/10.1186/s12985-018-1046-zLAMPPMLJC polyomavirusDetectionQuantification |
| spellingShingle | Hitomi Kinoshita Kazuo Nakamichi Chang-Kweng Lim Mutsuyo Takayama-Ito Lixin Wang Itoe Iizuka Ichiro Kurane Masayuki Saijo A loop-mediated isothermal amplification assay for the detection and quantification of JC polyomavirus in cerebrospinal fluid: a diagnostic and clinical management tool and technique for progressive multifocal leukoencephalopathy Virology Journal LAMP PML JC polyomavirus Detection Quantification |
| title | A loop-mediated isothermal amplification assay for the detection and quantification of JC polyomavirus in cerebrospinal fluid: a diagnostic and clinical management tool and technique for progressive multifocal leukoencephalopathy |
| title_full | A loop-mediated isothermal amplification assay for the detection and quantification of JC polyomavirus in cerebrospinal fluid: a diagnostic and clinical management tool and technique for progressive multifocal leukoencephalopathy |
| title_fullStr | A loop-mediated isothermal amplification assay for the detection and quantification of JC polyomavirus in cerebrospinal fluid: a diagnostic and clinical management tool and technique for progressive multifocal leukoencephalopathy |
| title_full_unstemmed | A loop-mediated isothermal amplification assay for the detection and quantification of JC polyomavirus in cerebrospinal fluid: a diagnostic and clinical management tool and technique for progressive multifocal leukoencephalopathy |
| title_short | A loop-mediated isothermal amplification assay for the detection and quantification of JC polyomavirus in cerebrospinal fluid: a diagnostic and clinical management tool and technique for progressive multifocal leukoencephalopathy |
| title_sort | loop mediated isothermal amplification assay for the detection and quantification of jc polyomavirus in cerebrospinal fluid a diagnostic and clinical management tool and technique for progressive multifocal leukoencephalopathy |
| topic | LAMP PML JC polyomavirus Detection Quantification |
| url | http://link.springer.com/article/10.1186/s12985-018-1046-z |
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