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Testing labs can skip RNA extraction with new workflow

Promega Corporation has released XpressAmp Direct Amplification Reagents that facilitate RNA extraction-free sample preparation that is automation-friendly. 

With this innovation, laboratories testing for COVID-19 have a new tool that enables them to skip the potentially bottlenecked RNA extraction step of the workflow and move directly to polymerase chain reaction (PCR) amplification.  

The workflow involves three key steps: 

  1. Collect and store sample – use common nasopharyngeal swabs in transport media. 
  2. Lyse sample – mix sample and XpressAmp Lysis Buffer (1:1) and incubate for 10 minutes at room temperature. 
  3. Amplify and analyse – add lysed sample to RT-qPCR containing XpressAmp Solution. 

Viral inactivation studies were performed on behalf of Promega Corporation by Dr. Thomas Klimkait from the Molecular Virology Group, Department of Biomedicine, University of Basel, Switzerland. The studies found that the XpressAmp Lysis Buffer successfully inactivated the SARS-CoV-2 virus and the results were presented at the 2020 American Society of Human Genetics (ASHG) virtual meeting. 

Promega, a global manufacturer of reagents, assays, and benchtop instruments essential for COVID-19 research, drug development and diagnostic testing, including RNA extraction, increased production dramatically since the start of the pandemic to address a 10-fold increase in demand. Reagent manufacturers worldwide responded similarly. Still, supply and demand gaps remain, particularly around RNA extraction. Promega sought a solution that leverages the company’s more than 40 years of experience in both sample preparation and amplification, especially its work with challenging samples such as forensic crime scene evidence. The result is a direct amplification method that simplifies and accelerates time to qPCR results. 

Promega chief medical officer Ashley Anderson said: “We are constantly exploring ways to apply our scientific and manufacturing expertise to help labs address the unprecedented demands they are facing for COVID-19 testing. Offering an option to skip RNA extraction and move directly to PCR amplification not only saves time, but it also addresses potential supply constraints since the many buffers and optimisation reagents needed for extraction and wash steps in a typical PCR workflow are no longer needed.” 

XpressAmp Direct Amplification Reagents are also available as a custom product that can be adjusted in numerous ways to suit a laboratory’s specific needs. Options include purchasing in bulk, changing the dispense size or reformatting and re-labelling.  

Since January 2020, the company has provided enough reagents and enzymes to enable testing an estimated 700 million samples for SARS-CoV-2 worldwide. Promega components currently support approximately 30 COVID-19 test kits around the world. 

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