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2020 ; 182
(4
): 812-827.e19
Nephropedia Template TP
gab.com Text
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English Wikipedia
Tracking Changes in SARS-CoV-2 Spike: Evidence that D614G Increases Infectivity
of the COVID-19 Virus
#MMPMID32697968
Korber B
; Fischer WM
; Gnanakaran S
; Yoon H
; Theiler J
; Abfalterer W
; Hengartner N
; Giorgi EE
; Bhattacharya T
; Foley B
; Hastie KM
; Parker MD
; Partridge DG
; Evans CM
; Freeman TM
; de Silva TI
; McDanal C
; Perez LG
; Tang H
; Moon-Walker A
; Whelan SP
; LaBranche CC
; Saphire EO
; Montefiori DC
Cell
2020[Aug]; 182
(4
): 812-827.e19
PMID32697968
show ga
A SARS-CoV-2 variant carrying the Spike protein amino acid change D614G has
become the most prevalent form in the global pandemic. Dynamic tracking of
variant frequencies revealed a recurrent pattern of G614 increase at multiple
geographic levels: national, regional, and municipal. The shift occurred even in
local epidemics where the original D614 form was well established prior to
introduction of the G614 variant. The consistency of this pattern was highly
statistically significant, suggesting that the G614 variant may have a fitness
advantage. We found that the G614 variant grows to a higher titer as pseudotyped
virions. In infected individuals, G614 is associated with lower RT-PCR cycle
thresholds, suggestive of higher upper respiratory tract viral loads, but not
with increased disease severity. These findings illuminate changes important for
a mechanistic understanding of the virus and support continuing surveillance of
Spike mutations to aid with development of immunological interventions.