A simple, safe and sensitive method for SARS-CoV-2 inactivation and RNA extraction for RT-qPCR
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A simple, safe and sensitive method for SARS-CoV-2 inactivation and RNA extraction for RT-qPCR. / Kalnina, Lelde; Mateu-Regué, Àngels; Oerum, Stephanie; Hald, Annemette; Gerstoft, Jan; Oerum, Henrik; Nielsen, Finn Cilius; Iversen, Astrid K.N.
I: APMIS, Bind 129, Nr. 7, 2021, s. 393-400.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - A simple, safe and sensitive method for SARS-CoV-2 inactivation and RNA extraction for RT-qPCR
AU - Kalnina, Lelde
AU - Mateu-Regué, Àngels
AU - Oerum, Stephanie
AU - Hald, Annemette
AU - Gerstoft, Jan
AU - Oerum, Henrik
AU - Nielsen, Finn Cilius
AU - Iversen, Astrid K.N.
N1 - Publisher Copyright: © 2021 The Authors. APMIS published by John Wiley & Sons Ltd on behalf of Scandinavian Societies for Medical Microbiology and Pathology
PY - 2021
Y1 - 2021
N2 - The SARS-CoV-2 pandemic has created an urgent need for diagnostic tests to detect viral RNA. Commercial RNA extraction kits are often expensive, in limited supply, and do not always fully inactivate the virus. Together, this calls for the development of safer methods for SARS-CoV-2 extraction that utilize readily available reagents and equipment present in most standard laboratories. We optimized and simplified a RNA extraction method combining a high molar acidic guanidinium isothiocyanate (GITC) solution, phenol and chloroform. First, we determined the GITC/RNA dilution thresholds compatible with an efficient two-step RT-qPCR for B2M mRNA in nasopharyngeal (NP) or oropharyngeal (OP) swab samples. Second, we optimized a one-step RT-qPCR against SARS-CoV-2 using NP and OP samples. We furthermore tested a SARS-CoV-2 dilution series to determine the detection threshold. The method enables downstream detection of SARS-CoV-2 by RT-qPCR with high sensitivity (~4 viral RNA copies per RT-qPCR). The protocol is simple, safe, and expands analysis capacity as the inactivated samples can be used in RT-qPCR detection tests at laboratories not otherwise classified for viral work. The method takes about 30 min from swab to PCR-ready viral RNA and circumvents the need for commercial RNA purification kits.
AB - The SARS-CoV-2 pandemic has created an urgent need for diagnostic tests to detect viral RNA. Commercial RNA extraction kits are often expensive, in limited supply, and do not always fully inactivate the virus. Together, this calls for the development of safer methods for SARS-CoV-2 extraction that utilize readily available reagents and equipment present in most standard laboratories. We optimized and simplified a RNA extraction method combining a high molar acidic guanidinium isothiocyanate (GITC) solution, phenol and chloroform. First, we determined the GITC/RNA dilution thresholds compatible with an efficient two-step RT-qPCR for B2M mRNA in nasopharyngeal (NP) or oropharyngeal (OP) swab samples. Second, we optimized a one-step RT-qPCR against SARS-CoV-2 using NP and OP samples. We furthermore tested a SARS-CoV-2 dilution series to determine the detection threshold. The method enables downstream detection of SARS-CoV-2 by RT-qPCR with high sensitivity (~4 viral RNA copies per RT-qPCR). The protocol is simple, safe, and expands analysis capacity as the inactivated samples can be used in RT-qPCR detection tests at laboratories not otherwise classified for viral work. The method takes about 30 min from swab to PCR-ready viral RNA and circumvents the need for commercial RNA purification kits.
KW - clinical microbiology
KW - molecular microbiology
KW - rapid diagnostic methods
KW - RNA extraction
KW - RT-qPCR
KW - SARS-CoV-2
KW - SARS-CoV-2 RT-qPCR
KW - virology
KW - virus inactivation
U2 - 10.1111/apm.13123
DO - 10.1111/apm.13123
M3 - Journal article
C2 - 33730407
AN - SCOPUS:85102593074
VL - 129
SP - 393
EP - 400
JO - A P M I S. Acta Pathologica, Microbiologica et Immunologica Scandinavica
JF - A P M I S. Acta Pathologica, Microbiologica et Immunologica Scandinavica
SN - 0903-4641
IS - 7
ER -
ID: 302569642