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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Virol
2015 ; 89
(20
): 10532-47
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Severe Acute Respiratory Syndrome (SARS) Coronavirus ORF8 Protein Is Acquired
from SARS-Related Coronavirus from Greater Horseshoe Bats through Recombination
#MMPMID26269185
Lau SK
; Feng Y
; Chen H
; Luk HK
; Yang WH
; Li KS
; Zhang YZ
; Huang Y
; Song ZZ
; Chow WN
; Fan RY
; Ahmed SS
; Yeung HC
; Lam CS
; Cai JP
; Wong SS
; Chan JF
; Yuen KY
; Zhang HL
; Woo PC
J Virol
2015[Oct]; 89
(20
): 10532-47
PMID26269185
show ga
Despite the identification of horseshoe bats as the reservoir of severe acute
respiratory syndrome (SARS)-related coronaviruses (SARSr-CoVs), the origin of
SARS-CoV ORF8, which contains the 29-nucleotide signature deletion among human
strains, remains obscure. Although two SARS-related Rhinolophus sinicus bat CoVs
(SARSr-Rs-BatCoVs) previously detected in Chinese horseshoe bats (Rhinolophus
sinicus) in Yunnan, RsSHC014 and Rs3367, possessed 95% genome identities to human
and civet SARSr-CoVs, their ORF8 protein exhibited only 32.2 to 33% amino acid
identities to that of human/civet SARSr-CoVs. To elucidate the origin of SARS-CoV
ORF8, we sampled 348 bats of various species in Yunnan, among which diverse
alphacoronaviruses and betacoronaviruses, including potentially novel CoVs, were
identified, with some showing potential interspecies transmission. The genomes of
two betacoronaviruses, SARSr-Rf-BatCoV YNLF_31C and YNLF_34C, from greater
horseshoe bats (Rhinolophus ferrumequinum), possessed 93% nucleotide identities
to human/civet SARSr-CoV genomes. Although these two betacoronaviruses displayed
lower similarities than SARSr-Rs-BatCoV RsSHC014 and Rs3367 in S protein to civet
SARSr-CoVs, their ORF8 proteins demonstrated exceptionally high (80.4 to 81.3%)
amino acid identities to that of human/civet SARSr-CoVs, compared to
SARSr-BatCoVs from other horseshoe bats (23.2 to 37.3%). Potential recombination
events were identified around ORF8 between SARSr-Rf-BatCoVs and SARSr-Rs-BatCoVs,
leading to the generation of civet SARSr-CoVs. The expression of ORF8 subgenomic
mRNA suggested that the ORF8 protein may be functional in SARSr-Rf-BatCoVs. The
high Ka/Ks ratio among human SARS-CoVs compared to that among SARSr-BatCoVs
supported that ORF8 is under strong positive selection during animal-to-human
transmission. Molecular clock analysis using ORF1ab showed that SARSr-Rf-BatCoV
YNLF_31C and YNLF_34C diverged from civet/human SARSr-CoVs in approximately 1990.
SARS-CoV ORF8 originated from SARSr-CoVs of greater horseshoe bats through
recombination, which may be important for animal-to-human transmission.
IMPORTANCE: Although horseshoe bats are the primary reservoir of SARS-related
coronaviruses (SARSr-CoVs), it is still unclear how these bat viruses have
evolved to cross the species barrier to infect civets and humans. Most human
SARS-CoV epidemic strains contain a signature 29-nucleotide deletion in ORF8,
compared to civet SARSr-CoVs, suggesting that ORF8 may be important for
interspecies transmission. However, the origin of SARS-CoV ORF8 remains obscure.
In particular, SARSr-Rs-BatCoVs from Chinese horseshoe bats (Rhinolophus sinicus)
exhibited <40% amino acid identities to human/civet SARS-CoV in the ORF8 protein.
We detected diverse alphacoronaviruses and betacoronaviruses among various bat
species in Yunnan, China, including two SARSr-Rf-BatCoVs from greater horseshoe
bats that possessed ORF8 proteins with exceptionally high amino acid identities
to that of human/civet SARSr-CoVs. We demonstrated recombination events around
ORF8 between SARSr-Rf-BatCoVs and SARSr-Rs-BatCoVs, leading to the generation of
civet SARSr-CoVs. Our findings offer insight into the evolutionary origin of
SARS-CoV ORF8 protein, which was likely acquired from SARSr-CoVs of greater
horseshoe bats through recombination.