Introduction: Delta variants have a number of characteristic mutations in their spike protein, including single-nucleotide polymorphisms (SNPs) resulting in T19R, R158G, L452R, T478 K, D614G, P681R, and D950N, which are usually chosen as the detection targets of the molecular diagnostics for Delta genotyping.
Analysis of SARS-CoV-2 variants B.1.617: host tropism, proteolytic activation, cell-cell fusion, and neutralization sensitivity.
Figure: Data show the neutralization ID50 ratio of each variant, compared with the D614G reference strain.
Figure: Fluorescence signals of GFP were normalized to the signal of the D614G reference strain after 1 h of co-incubation; values shown indicate means +- SEMs.
Figure: Neutralization activities of from animals immunized with D614G and other SARS-CoV-2 variants.
Figure: Normalized ID50 ratios compared to D614G reference strain are shown.
Figure: Normalized chemiluminescence signals (in RLUs) of target cells were calculated compared with the D614G reference strain.
Figure: Ratios of infectivity compared with the D614G reference strain were shown.
Figure: Reduced differences (compared with the D614G r
Fusogenicity and neutralization sensitivity of the SARS-CoV-2 Delta sublineage AY.4.2.
Introduction: The spike protein of Delta contains 9 mutations, when co
Method: The D614G spike plasmid was generated by introducing the mutation into the Wuhan reference strain via Q5 site-directed mutagenesis (NEB).
Result: As previously reported, the D614G and Alpha spike variants were less fusogenic than the Delta spike (Figure 2a, b, Figure S2).
Result: We previously reported using this assay that the spike protein of Alpha had the highest affinity to ACE2, followed by Delta and then by D614G.
Result: We thus analyzed the fusogenic activity of the AY.4.2 spike and compared it to the D614G, Alpha and Delta spikes.
Design of SARS-CoV-2 Variant-Specific PCR Assays Considering Regional and Temporal Characteristics.
PMID: 35285246
2022
Applied and environmental microbiology
Result: As a result, for the Alpha variant, we identified nine mutations in the spike gene: S:Delta69/70, S:Delta144, S:N510Y, S:A570D, S:D614G, S:P681H, S:T716I, S:S982A, and S:D1118H.
Result: For the Delta variant, we identified seven mutations: S:T19R, S:Delta156/157, S<
SARS-CoV-2 infection after vaccination in Italian health care workers: a case report.
PMID: 35283546
2022
National Academy science letters. National Academy of Sciences, India
Abstract: Their genotyping performed on RNA extracts highlighted the presence of del69/70, N501Y, A570D, and 1841A > G (D614G) sequence variants, all indicative of VOC 202012/01-lineage B.1.1.7, suggesting a common source of infection.
Result: The genotyping performed first by Real-time PCR and then confirmed by direct sequencing proved the presence of del69/70, N501Y, A570D, and 1841A > G (D614G) variants, indicative of VOC 202,012/01-lineage B.
Figure: Sections from the electropherograms showing the 69/70, N501Y, A570D, and D614G (a., b., c., d.) associated with SARS-CoV-2 Alfa Variant B.1.1.7.
Cross-Neutralizing Breadth and Longevity Against SARS-CoV-2 Variants After Infections.
Discussion: Further follow-up will be needed to confirm whether the specific Nab titer against D614G is maintained or not.
Discussion: The neutralizing titer against D614G significantly decreased in sera of 6-8 months post onset compared to those of 1-3 months post onset ( Figure 3B ).
Discussion: The purpose of this study was to examine the longevity of Nab activity of COVID-19 convalescent sera against D614G, and their neutralizing breadth against B.1.1.7, P.1, and B.1.351.
Discussion: These observations suggested that all participants in this study were likely to be infected with D614G.
Discussion: This reason might be that weak immune-response against SARS-CoV-2 lead to the low Nab titers of 'patients without pneumonia' against PMID: 35273217
2022
Scientific reports
Abstract: In addition, neutralizing activity against the D614G, Alpha and Delta variants was also significantly lower after Beta spike vaccination than after Wuhan spike vaccination.
Method: Pre-fusion spike protein ectodomain DNA constructs were designed containing the following mutations compared to the Wuhan variant (Wuhan Hu-1; GenBank: MN908947.3): deletion of H69, V70 and Y144, N501Y, A570D, D614G, P681H, T716I, S982A and D1118H in Alpha; L18F, D80A, D215G, L242H,
Evolutionary history of the SARS-CoV-2 Gamma variant of concern (P.1): a perfect storm.
PMID: 35266951
2022
Genetics and molecular biology
Introduction: Currently, the WHO has identified the Gamma lineage (B.1.1.28.1, P.1 or Gamma; Nextstrain clade 20J/V3) with the following key S mutations: L18F, T20N, P26S, D138Y, R190S, K417T, E484K, N501Y, D614G, H655Y, T1027I, and V1176F.
Introduction: Key S mutations: L452R, D614G, P681R, +- (E484Q, Q107H,
A screening strategy for identifying the dominant variant of SARS-COV-2 in the fifth peak of Kurdistan- Iran population using HRM and Probe-based RT-PCR assay.
PMID: 35271889
2022
Journal of virological methods
Result: 94 cases were detected in the CY5.5 channel for the mutant type of D614G and L452R mutations.
Result: Sequencing results overlapped with the results of the Primer-Probe assay, 94 samples had the D614G and L452R mutations with 5 samples encompassing Del69/70.
Result: The 5 samples had detected by the Primer-Probe UK variant had the same melting curves that differed from 89 cases containing D614G, L452R, and T478K mutations.
Result: The same melting curves patterns were detected in all cases for the D614G.
Result: Those samples with negative results for E484K,
SARS_CoV_2 mutation literature information.
PMID: 
2022
Biomedicine & pharmacotherapy
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