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The Trumpet Newspaper Issue 555 (October 6 - 19 2021)

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Page10 <strong>The</strong><strong>Trumpet</strong> OCTOBER 6 - <strong>19</strong> <strong>2021</strong><br />

Science<br />

Scientists discover why some<br />

individuals have stronger natural<br />

defences against SARS-COV-2<br />

Anew study has revealed key<br />

insights into the natural human<br />

antiviral defences against<br />

SARS-CoV-2, the virus that causes<br />

COVID-<strong>19</strong>.<br />

<strong>The</strong> research, published in the<br />

journal Science and led by a team of<br />

scientists at the MRC-University of<br />

Glasgow Centre for Virus Research,<br />

sheds new light on why some people<br />

are naturally more resistant to serious<br />

SARS-CoV-2 infection – and how, in<br />

the future, the coronavirus might<br />

overcome this resistance.<br />

COVID-<strong>19</strong> is spread from person to<br />

person after the virus, shed by an<br />

infected person, infects the cells of a<br />

new host. Once infected, our cells try to<br />

fight off the invading virus and<br />

scientists already know that this works<br />

better in some people, making their<br />

experience of the disease less severe.<br />

However, until now, that anti-viral<br />

response – and its effect on the virus<br />

SARS-CoV-2 – hasn’t been wellunderstood.<br />

In the study, the scientists reveal that<br />

some people have a version of a gene,<br />

called OAS1, that potently inhibits<br />

SARS-CoV-2.<br />

<strong>The</strong> study showed that, while some<br />

people can express a more protective<br />

‘prenylated’ version of the OAS1 gene,<br />

other people express a version of this<br />

gene which does not detect SARS-<br />

CoV-2.<br />

Inside cells, coronaviruses hide and<br />

replicate inside vesicles coated with<br />

Some individuals have stronger natural defences against SARS-COV-2..<br />

lipid (fat). Prenylation is the addition of<br />

a single molecule of lipid (fat) to a<br />

protein – and it’s this technical<br />

difference that allows prenylated OAS1<br />

to ‘seek out’ the invading virus and<br />

‘sound the alarm’.<br />

<strong>The</strong> study found that, in hospitalised<br />

patients, expression of a prenylated<br />

version of this gene was associated with<br />

protection from severe COVID-<strong>19</strong>,<br />

which suggests this antiviral defence is<br />

a major component of a protective<br />

antiviral response; and is likely to have<br />

offered protection to many people<br />

during the course of the pandemic.<br />

<strong>The</strong> study also found that<br />

hospitalized COVID-<strong>19</strong> patients with<br />

the ‘bad’ form of OAS1 had worse<br />

clinical outcomes compared to those<br />

who expressed the protective<br />

prenylated version of OAS1. Severe<br />

disease was significantly more frequent<br />

with ICU admission or death being<br />

approximately 1.6 times more likely in<br />

these patients.<br />

Interestingly, the researchers also<br />

found that, approximately 55 million<br />

years ago, there was a removal of this<br />

protective gene in horseshoe bats – the<br />

presumed source of SARS-CoV-2) – so<br />

therefore SARS-CoV-2 never had to<br />

adapt to evade this defence.<br />

As the protective prenylated OAS1<br />

gene is widespread in animals, the<br />

billions of people that lack this<br />

protective gene could make humans<br />

particularly vulnerable to the spill over<br />

of coronaviruses from horseshoe bats.<br />

Sam Wilson said: “We know viruses<br />

adapt, and even SARS-CoV-2 has<br />

likely adapted to replicate in the animal<br />

reservoir(s) in which it circulates.<br />

Cross-species transmission to humans<br />

exposed the virus SARS-CoV-2 to a<br />

new repertoire of antiviral defences,<br />

some of which SARS-CoV-2 may not<br />

know how to evade.<br />

“What our study shows us is that the<br />

coronavirus that caused the SARS<br />

outbreak in 2003 learned to evade<br />

prenylated OAS1. If SARS-CoV-2<br />

variants learn the same trick, they could<br />

be substantially more pathogenic and<br />

transmissible in unvaccinated<br />

populations. This reinforces the need to<br />

continually monitor the emergence of<br />

new SARS-CoV-2 variants.”<br />

<strong>The</strong> study, ‘A Prenylated dsRNA<br />

Sensor Protects Against Severe<br />

COVID-<strong>19</strong>,’ is published in Science.<br />

<strong>The</strong> study was predominantly funded<br />

by the Medical Research Council,<br />

Wellcome, and UKRI.<br />

A link to the study can be found<br />

here:<br />

https://www.science.org/doi/10.1126/s<br />

cience.abj3624<br />

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