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The Hindu – Telangana

CSIR-CCMB scientists publish study documenting mutation landscape of SARS-CoV-2 virus in India

The coronavirus SARS-CoV-2 genome has evolved as it transmits through its human hosts, but luckily the novel variants worrying many countries globally have had a low prevalence here. But, the low prevalence of — immune-escape ‘E484K’ mutation and the ‘N501Y’ mutation with higher transmission rate — could also be simply because not enough sequencing has been done.

“More coronavirus genomes need to be sequenced across the country to accurately identify the emergence of these two and any other new variants,” asserted CSIR-CCMB Director Rakesh Mishra on Friday.

CCMB scientists led by Dr. Mishra, having genome sequenced over 5,000 coronavirus variants so far, have also found that a few novel variants are spreading more in some States. “We now have emerging evidence that ‘N440K’ is spreading a lot more in southern states. Closer surveillance is needed to understand its spread properly. Accurate and timely detection of new variants that may show greater infectivity or worse clinical symptoms, including immune escape, will be extremely important to preempt disastrous consequences,” he said.

The Director and his team consisting of Surabhi Srivastava, Sofia Banu, Priya Singh, Divya Tej Sowpati have just published a paper — “SARS-CoV-2 genomics – an Indian perspective on sequencing viral variants” — presenting an exhaustive analysis of the coronavirus variants and how they have evolved over the course of the pandemic in the country. (https://data.ccmb.res.in/gear19/).

Variants discovered

In this paper, the scientists explain how different coronavirus variants gained prevalence and one of the variants ‘A3i’ had mutations that were predicted to make its spread slower. It was overtaken by the globally prevalent ‘A2a’ variant, carrying the ‘D614G’ mutation, by June 2020. The ‘A2a’ variant has remained in global dominance for the…

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