Great to see South African science advancing fast!
The paper starts by showing how the second wave in South Africa arise so quickly, which was completely unexpected as we were in the start of our summer.
It show how a new and unusual cluster emerged among the dozens of different lineages already circulating in South Africa.
This new variant, the 501Y.V2 (or B.1.351) went to dominate the great majority of infections in the country.
It also spread very fast across the coast in South Africa, moving very fast to south west (in direction of Cape Town) and north east (passing through Durban in the direction of Mozambique ).
The 501Y.V2 variant has 23 mutations, which around 20 are amino acid changing mutation and 9 in the Spike region.
As one map the mutations on the 3-D structure of the virus, it becomes clear that they are clustered in regions that are associated with ACE2 receptor binding (RBD) and antibody escape (RBD and NTD)
A fantastic team effort of 5 Universities (UCT, Stellenbosch, Wits, UFS and KRISP/UKZN) and the large government labs (NHLS and NICD) in South Africa
So may people to thank for this great team effort!
And of course to our national funders that believed that it is possible: Thanks @SAMRC, @dsigovza@tiaorgza !
Now we are expanding the network with national and international funders to further advance genomics surveillance in SA & help other African countries...
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A truly global collaboration between groups in South Africa, U.K., Belgium, Sweeden, USA to understand convergent evolution of the variants of concern.
ARS-CoV-2 genome map indicating the locations and encoded amino acid changes of what we considered here to be signature mutations of 501Y.V1 (B.1.1.7), 501Y.V2 (B.1.251) and 501Y.V3 (p1) sequences. Amazing how different and similar the variants are...
Signals of positive selection detected at 37 signature mutation sites in the VOCs between March 2020 and January 2021. In short, must of the sites in Spike are in convergent evolution, including 501, 484, 417, 18, etc.
Another knock down paper from South Africa! This time 501Y.V2 (B.1.351) is giving again good news with confirming that neutralise other lineages but also another VOC, the P1.
We observed no significant difference in the magnitude of binding (Figure 1A) or neutralizing (Figure 1B) responses between the 501Y.V2 cohort and the wave 1 (i.e. B.1 original lineages) admission samples.
Plasma binding antibodies in 501Y.V2 infected individuals are cross-reactive.