developing sars-cov-2 rrt-pcr test...(thermo fisher) cfx96 (biorad) poweramp96 (kogene) cartridge...
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Developing SARS-CoV-2 rRT-PCR Test
Francisca Srioetami Tanoerahardjo
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Outline
•How to choose the instrument and method
•How to design PCR lab and its instruments
•How to preparing your staff
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Developing Molecular Laboratory
SERVICE only SERVICE → R n D
Small scale
High throughput
DevelopmentEvaluation
Data &
efficiencyProduct
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How to choose the instrument and method
•PCR Instrument
• Extraction
• Amplification
• Detection
•Basic Laboratory Equipment
• Centrifuges
•Micropipette
• etc
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PCR = Polymerase Chain Reaction
PCR steps:
• Denaturing
• Annealing
• Synthesizing
“temperature”
ISO-THERMAL PCR
“enzyme”
DNA Amplification
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LANGKAH-LANGKAH PEMERIKSAAN RT-PCR
• Persiapan bahan pemeriksaan / Spesimen
• Swab Nasofaring / Orofaring; Sputum; Broncho alveolar lavage (BAL); dll
• Mengandung virus (RNA)
• Ekstraksi RNA
• Proses inaktivasi
• Reverse trancriptase → cDNA
• Amplifikasi cDNA dan Deteksi denganProbe
• Denaturasi → annealing →amplifikasi →probe detection
• RT-PCR:
• one-step → contoh: TCM SARS-CoV-2
• two-step → Ekstrasi RNA→cDNA dan PCR & deteksi
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PCR Instrument for SARS-CoV-2 molecular detection
THERMALCYCLER
Close System
Open System
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PCR Instrument for SARS-CoV-2 molecular detection
THERMALCYCLER & Detection SystemClose System
with
Cartridge
Close System without
Cartridge (+ extraction)Open System
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Gambaran Alat – Reagen RT-PCR SARS-CoV-2
GeneXpert
(Cepheid)
ALAT
REAGEN
LightCycler
LC480 (Roche)
AB7500 FAST(Thermo Fisher)
CFX96
(BioRad)
PowerAmp96
(Kogene)
Cartridge
SARS-CoV-2
(Cepheid)
Abbott
m2000
Abbott
Real
time
SARS
CoV2
Liferiver
Novel
Coronavirus
COVID-19
(2019 nCoV)
Real Time
Multiplex kit
Acu-
CORONA
Acumen
Research
Lab
Singapore
PowerCheck
2019-nCoV
Real time
PCR Kit
A*STAR
Fortitude
Kit
SD Biosensor
Standar M
nCoV Real
time
Detection
Kit
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How to choose the instrument and method
• Insert kit – details
• ISO20395:2019(E) 1st ed. 2019-08• Biotechnology – Requirements for evaluating the performance of quantification methods for nucleic acid target sequences – qPCR and dPCR
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• Design of measurement procedure• Quantification method
• qPCR – NA concentration → calibration curve• dPCR – copy number → molecular counting
• Sample QC• Total NA quantity• Integrity• Purity
How to choose the instrument and method 1
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• Assay design and quantification of NA target seq• Assay design
• Target• Primers and probe• Specification
• Assay optimation• Fluorescence signal• Amplification efficiency• specificity
How to choose the instrument and method 2
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• Presicion
• LoQ
• LoD
• Linearity
• Trueness
How to choose the instrument and method 3
Nucleic Acid quantification measurements
• Robustness
• Repeatability
• Reproducibility
•Method of validation
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• Data QC & analysis• Acceptance criteria
• Threshold setting
• Data pre processing (Calibration curve)
•NA quantification measurements traceability and comparability
•Measurement uncertanty
How to choose the instrument and method 4
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Limit of Detection
• Estimation of LOD shall take account of both the statistical distribution of false-positive results and true positive samples.
• The probability of false positive detection (β) and false negative detection (α) (for example p = 0,05) or confidence of classifying a true positive (equal to 1 – α) or false negative (equal to 1 – β) shall be specified
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Linearity
• The degree of linearity within this range shall be characterized in terms of slope and correlation coefficient (for example, Pearson’s correlation coefficient, R) by regression analysis of expected nucleic acid quantity vs. observed nucleic acid quantity. The measurand shall be the quantity measured by the method
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Limit of Blanc
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Precision
• Precision is a measure of the variability in independent measurement results obtained for the same sample under stipulated conditions
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Specificity
• Extraction from clinical samples• Pos cases
• Neg cases
• Ct value from pos sample compare with reference Ct value
• Ct value of known negative sample
• All results are concordant with the actual clinical diagnoses
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How to design PCR lab and its instruments
•Unidirectional workflow
•Pressure• Avoid contamination
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Molecular Laboratory Design
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Molecular Laboratory Design
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Basic Equipment
• BSC class II
• Laminair hood (PCR hood)
• Refrigerator
• Deep freezer
• Centrifuge biocontainment
• Autoclave
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How to preparing your staff
•Dedicated Staff• ATML, Biologist, Biotechnologist, Chemist, Pharmacist, Clinical Pathologist, Microbiologist
•Certified Technical Training – GLP
•Fellowship
•Biosafety and Biosecurity Training
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Terima Kasih
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Terima Kasih