scholarly journals Mosquito-specific viruses (family Flaviviridae, genus Flavivirus) Diisolasi pada Nyamuk Anopheles vagus di Bali

2021 ◽  
Vol 22 (2) ◽  
pp. 189-197
Author(s):  
Putu Ayu Asri Damayanti ◽  
I Nyoman Mantik Astawa ◽  
Anak Agung Ayu Mirah Adi ◽  
I Made Sudarmaja ◽  
I Kadek Swastika ◽  
...  
Keyword(s):  
Polymerase Chain Reaction ◽  
Reverse Transcriptase ◽  
Light Trap ◽  
Baby Hamster Kidney ◽  
Rt Pcr ◽  
Chain Reaction ◽  
One Step ◽  
Polymerase Chain ◽  
Anopheles Vagus

Mosquito-specific viruses (MSVs) adalah virus yang hanya dapat bereplikasi pada sel nyamuk. Virus ini terdiri dari berbagai genus, salah satunya yang paling banyak ditemukan adalah dari famili Flaviviridae, genus Flavivirus. Namun, data keberadaan dan karakteristik MSVs dan vektornya di Bali saat ini sangat terbatas. Oleh karena itu, pengamatan untuk memperluas penemuan keragaman vektor dan filogenetik MSVs famili Flaviviridae, genus Flavivirus di Bali dilakukan pada tahun 2016-2018. Nyamuk-nyamuk dewasa ditangkap menggunakan light trap dan dikelompokkan berdasarkan spesies. Isolasi dan propagasi virus dilakukan pada galur sel C6/36 dan baby hamster kidney-21 (BHK-21). Identifikasi virus dilakukan dengan menggunakan one step reverse-transcriptase polymerase chain reaction (RT-PCR). Terdapat dua pool yang berasal dari nyamuk Anopheles vagus menampakan cythopathic effect (CPE) hanya pada galur sel C6/36 dari total 158 pool. Virus yang diisolasi memiliki persentase identity sekuen nukleotida tertinggi 97% dan sekuen asam amino 96% dengan virus Culex theileri Flavivirus isolat JKT-8650 yang diisolasi pada tahun 1981. Selanjutnya, virus dinamakan Mosquito Flavivirus Isolate Bali (MFB) dengan accession numbers KY995166 dan KY290258. Analisis filogenetik menunjukan bahwa MFB berada satu kluster dengan Culex theileri Flavivirus (CTFV) dari Indonesia, Culex Flavivuruses-Myanmar, Culex theileri Flavivirus-Portugal, dan Mosquito Flavivirus-Turki. Terdapat delapan nukelotida dan enam asam amino yang berbeda antara MFB dan CTFV Indonesia. Pada penelitian ini dapat disimpulkan bahwa MSVs dari famili Flaviviridae, genus Flavivirus berhasil diisolasi dari nyamuk An. vagus di Bali.

scholarly journals A meta-analysis of accuracy and sensitivity of chest CT and RT-PCR in COVID-19 diagnosis

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Fatemeh Khatami ◽  
Mohammad Saatchi ◽  
Seyed Saeed Tamehri Zadeh ◽  
Zahra Sadat Aghamir ◽  
Alireza Namazi Shabestari ◽  
...  
Keyword(s):  
Polymerase Chain Reaction ◽  
Reverse Transcriptase ◽  
Ct Scan ◽  
Predictive Value ◽  
Meta Analysis ◽  
Chest Ct ◽  
Rt Pcr ◽  
Chain Reaction ◽  
Polymerase Chain ◽  
Chest Ct Scan

AbstractNowadays there is an ongoing acute respiratory outbreak caused by the novel highly contagious coronavirus (COVID-19). The diagnostic protocol is based on quantitative reverse-transcription polymerase chain reaction (RT-PCR) and chests CT scan, with uncertain accuracy. This meta-analysis study determines the diagnostic value of an initial chest CT scan in patients with COVID-19 infection in comparison with RT-PCR. Three main databases; PubMed (MEDLINE), Scopus, and EMBASE were systematically searched for all published literature from January 1st, 2019, to the 21st May 2020 with the keywords "COVID19 virus", "2019 novel coronavirus", "Wuhan coronavirus", "2019-nCoV", "X-Ray Computed Tomography", "Polymerase Chain Reaction", "Reverse Transcriptase PCR", and "PCR Reverse Transcriptase". All relevant case-series, cross-sectional, and cohort studies were selected. Data extraction and analysis were performed using STATA v.14.0SE (College Station, TX, USA) and RevMan 5. Among 1022 articles, 60 studies were eligible for totalizing 5744 patients. The overall sensitivity, specificity, positive predictive value, and negative predictive value of chest CT scan compared to RT-PCR were 87% (95% CI 85–90%), 46% (95% CI 29–63%), 69% (95% CI 56–72%), and 89% (95% CI 82–96%), respectively. It is important to rely on the repeated RT-PCR three times to give 99% accuracy, especially in negative samples. Regarding the overall diagnostic sensitivity of 87% for chest CT, the RT-PCR testing is essential and should be repeated to escape misdiagnosis.

scholarly journals Use of immunodot blot and multiplex reverse transcriptase-polymerase chain reaction in dengue virus detection in macerates of Aedes aegypti larvae

2012 ◽  
Vol 3 (1) ◽  
pp. 13
Author(s):  
Aline T.A. Chagas ◽  
Michelle D. Oliveira ◽  
Jose M.S. Mezencio ◽  
Eduardo A.M. Silva ◽  
Leandro L. Oliveira ◽  
...  
Keyword(s):  
Polymerase Chain Reaction ◽  
Aedes Aegypti ◽  
Dengue Virus ◽  
Reverse Transcriptase ◽  
Epidemiological Surveillance ◽  
Rt Pcr ◽  
Chain Reaction ◽  
Denv Serotypes ◽  
Polymerase Chain ◽  
Pcr Techniques

The <em>Dengue virus</em> is the main arbovirus that affects man in terms of morbidity and mortality. The detection of the virus is very important for epidemiological surveillance, so here we propose to standardize and compare the immunodot blot (IDB) and multiplex reverse transcriptase-polymerase chain reaction (M-RT-PCR) techniques to detect and characterize the dengue virus (DENV) serotypes in samples of <em>Aedes aegypti</em> larvae. Thus, the IDB and M-RT-PCR techniques were standardized using macerated samples of larvae collected in nature. The use of monoclonal antibodies in IDB has not shown great results, but DENV detection through this method was possible using polyclonal antibodies. The distinction of serotypes 1, 2 and 3 was carried out by M-RT-PCR.

scholarly journals Deteksi Molekuler Virus Dengue dan Chikungunya pada Nyamuk Aedes spp. di Kecamatan Cilongok

2020 ◽  
Vol 2 (2) ◽  
pp. 181
Author(s):  
Dwi Iva Fitriana ◽  
Endang Srimurni Kusmintarsih ◽  
Trisnowati Budi Ambarningrum
Keyword(s):  
Polymerase Chain Reaction ◽  
Reverse Transcriptase ◽  
Rt Pcr ◽  
Chain Reaction ◽  
Polymerase Chain

DBD dan chikungunya merupakan salah satu penyakit yang masih menjadi masalah di Indonesia. Kecamatan Cilongok merupakan salah kecamatan endemis DBD dan pernah mengalami KLB chikungunya. Deteksi virus pada nyamuk sebelum menginfeksi manusia penting sebagai peringatan dini dalam upaya pencegahan wabah di daerah endemis. Tujuan penelitian ini adalah mengetahui infeksi virus Dengue dan Chikungunya pada nyamuk Aedes spp. yang ditangkap. Penelitian ini dilakukan di empat desa di Kecamatan Cilongok yang meliputi Desa Cilongok, Pernasidi, Kalisari, dan Jatisaba, pengambilan sampel dilakukan secara purposive. Deteksi virus Dengue dan Chikungunya pada nyamuk dilakukan menggunakan metode Reverse-Transcriptase Polymerase Chain Reaction (RT-PCR). Hasil positifitas virus dianalisis secara deskriptif untuk menggambarkan potensi transmisi virus. Hasil penelitian menunjukkan bahwa nyamuk Aedes spp. yang tertangkap tidak mengandung virus Dengue dan Chikungunya.  

Detection of BCR–ABL using one step reverse transcriptase- polymerase chain reaction and microchip electrophoresis

Methods ◽  
2013 ◽  
Vol 64 (3) ◽  
pp. 250-254 ◽  
Author(s):  
Xuexia Lin ◽  
Jing Wu ◽  
Wu Liu ◽  
Haifang Li ◽  
Zhihua Wang ◽  
...  
Keyword(s):  
Polymerase Chain Reaction ◽  
Reverse Transcriptase ◽  
Microchip Electrophoresis ◽  
Chain Reaction ◽  
One Step ◽  
Polymerase Chain

scholarly journals A reverse transcriptase-polymerase chain reaction detects heterogeneous chimeric mRNAs in leukemias with 11q23 abnormalities

Blood ◽  
1994 ◽  
Vol 83 (10) ◽  
pp. 2912-2921 ◽  
Author(s):  
K Yamamoto ◽  
M Seto ◽  
S Iida ◽  
H Komatsu ◽  
N Kamada ◽  
...  
Keyword(s):  
Polymerase Chain Reaction ◽  
Reverse Transcriptase ◽  
Response To Therapy ◽  
Chromosome 9 ◽  
Rt Pcr ◽  
Chain Reaction ◽  
Single Clone ◽  
Sensitivity Studies ◽  
Polymerase Chain ◽  
11Q23 Abnormalities

Abstract The MLL gene involved in 11q23 translocations found in the majority of infantile leukemias and some secondary leukemias makes fusion transcripts with genes such as LTG4 (chromosome 4), LTG9 (chromosome 9), and LTG19 (chromosome 19) as a result of reciprocal translocation. We have examined 25 cases of leukemias with 11q23 abnormalities by Southern blot analysis and the reverse transcriptase-polymerase chain reaction (RT-PCR). Using various primer pairs, chimeric mRNAs could be amplified in 6 of 7 leukemias with t(4;11), 6 of 8 leukemias with t(9;11) including secondary leukemia, 8 of 9 leukemias with t(11;19), and 1 with a deletion at 11q23. The chimeric mRNAs were heterogeneous and differential usage of the MLL exons was found, irrespective of the partner chromosomes. Sensitivity studies showed that a single clone with chimeric mRNA in 10(4) to 10(5) cells could be detected. These findings show that the present RT-PCR settings provide a rapid, accurate, and sensitive tool for diagnosing leukemias with 11q23 translocations and for monitoring response to therapy in these patients.

Detection of Occult Melanoma Cells in Paraffin-Embedded Histologically Negative Sentinel Lymph Nodes Using a Reverse Transcriptase Polymerase Chain Reaction Assay

2001 ◽  
Vol 19 (5) ◽  
pp. 1437-1443 ◽  
Author(s):  
Giuseppe Palmieri ◽  
Paolo A. Ascierto ◽  
Antonio Cossu ◽  
Nicola Mozzillo ◽  
Maria L. Motti ◽  
...  
Keyword(s):  
Polymerase Chain Reaction ◽  
Reverse Transcriptase ◽  
Prognostic Significance ◽  
Primary Melanoma ◽  
Disease Stage ◽  
Occult Metastasis ◽  
Rt Pcr ◽  
Chain Reaction ◽  
Pcr Assay ◽  
Polymerase Chain

PURPOSE: Detection of occult metastasis before the development of clinical disease could allow more accurate staging, appropriate follow-up procedures, and adjuvant therapies in patients with malignant melanoma (MM). The sentinel lymph node (SLN) has been proposed as a reliable predictor of metastatic disease in the lymphatic basin draining the primary melanoma. In this study, we screened both paraffin-embedded SLNs and peripheral-blood (PB) samples from MM patients at various stage of disease using a multimarker reverse transcriptase polymerase chain reaction (RT-PCR) assay. The prognostic significance of the presence of PCR-positive markers was also evaluated. PATIENTS AND METHODS: Total RNA was obtained from paraffin-embedded SLN sections and PB samples of 75 MM patients. RT-PCR was performed using tyrosinase and MelanA/MART1 as melanoma-associated markers. Radiolabeled PCR products were analyzed on denaturing polyacrylamide gels. RESULTS: Good sensitivity of the RT-PCR assay on archival tissues was demonstrated after comparison of RT-PCR results on frozen and paraffin-embedded SLNs from 16 MM patients. Significant correlation between the disease stage and marker expression in both PB and SLN samples was observed; the highest value was for patients who were positive for both markers in SLN (P = .006). Progression of disease was significantly associated with the total number of PCR-positive markers in both PB (P = .034) and SLN (P = .001) samples. CONCLUSION: Although sensitivity is lowered by the use of paraffin-embedded specimens, our data indicate that RT-PCR analysis of serial sections from archival SLNs may be helpful in improving detection of occult micrometastases, thus improving staging of patients with melanoma.

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