@stevenemassey @quay_dr @Daoyu15 @humblesci @ydeigin @Rcoleptic @Engineer2The 10. Continued
3. MjHKU4r-CoV-1 infection was significantly affected by furin protease inhibitors.
4. Mutation experiments at the furin cleavage site in the S protein of MjHKU4r-CoV-1 demonstrated the crucial role of host protease cleavage during infection.
@stevenemassey @quay_dr @Daoyu15 @humblesci @ydeigin @Rcoleptic @Engineer2The 11. Continued (2)
5. They used various cell lines & organoids to observe infectivity of MjHKU4r-CoV-1
6. MjHKU4r-CoV-1 can infect various human cell lines & replicate in human respiratory & intestinal organoids
7. Also in vivo infection experiments in hDPP4 transgenic mice
@stevenemassey @quay_dr @Daoyu15 @humblesci @ydeigin @Rcoleptic @Engineer2The 13. How does all this relate to SARS-COV-2?
It is not yet known how SARS-COV-2 acquired its FCS.
This thread shows that SC-2 may have acquired its FCS via cell culture contamination involving GX Pangolin MERS Cov isolates (MjHKU4r-CoV-1) stored & experimented on at WIV in 2019.
1. FCS are more common in MERS Covs but in the HKU4 group, no such FCS exists.
2. Substitution of KQQR motif at the S1/S2 junction in the bat HKU4 to the RQQR found in MjHKU4r-CoV-1 results in the generation of a minimal consensus FCS (RXXR)!
@stevenemassey @quay_dr @Daoyu15 @humblesci @ydeigin @Rcoleptic @Engineer2The 17. A Logical Chain & Evidence have now been found
What remains is the question of the exact pathway and experiments that that led to the acquisition of an FCS in Sars-COV-2 in the laboratories of the WIV.
No wonder they refused to share their lab notebooks!
@stevenemassey @quay_dr @Daoyu15 @humblesci @ydeigin @Rcoleptic @Engineer2The 18. A possible pathway (now more likely)
For that, see Bernd Kaina's Paper:
"On the Origin of SARS-CoV-2: Did Cell Culture Experiments Lead to Increased Virulence of the Progenitor Virus for Humans?"
3. When cells in culture were coinfected with the predecessor of SARS-CoV-2 and another virus strain that contains the PCS/furin cleavage site, the sequence was transferred to the predecessor virus as a result of a recombination event.
4. Interestingly, MERS-CoV contains a furin-specific cleavage site, which is very similar to the one found in SARS-CoV-2. As outlined above, there are 6 identical amino acids between position 678 and 687 in SARS-CoV-2 and MERS-CoV.
5. Gain of function through the PCS could have happened unintentionally, e.g. after introducing different viruses into a cell to see whether they complement each other functionally (“in trans”), or purposefully in the context of gain-of-function experiments.
6. Propagation of the progenitor of SARS-CoV-2 (e.g. RaTG13) together with a MERS-CoV is likely to lead to the selection of a virus that gains functions of both viruses, thus increasing its infection rate in vitro.
7. The cells used were equipped with the ACE2 receptor. If these cells also harbored the neuropilin-1 membran protein, selection for a virus showing an even higher virus titer upon propagation in vitro is conceivable.
8. It should be noted that cell lines harboring ACE2 together with NRP1 and other desired properties can be generated by routine techniques (transient or stable transfection, lentivirus transduction) and have actually been used for experimental purposes.
There are many conceivable scenarios how transmission could occur in the lab, e.g. through aerosols during the work or handling of waste. Such lab events could have occurred repeatedly long before December 2019.
“Department of State claimed that WIV were working on Pangolins. This is absolute bullshit, it's just made up. Based on zero evidence. Why would you possibly work on a solitary animal with hard keratin scales in a lab?"
Rambaut & Andersen noted that SARS-COV-2 looks like a "convergence" between Pangolin Coronavirus & RaTG13. Billy has now shown that the WIV had all of those viruses & was conducting mutation & recombination experiments on them.
"Garry figuring out on 10 Feb 2020 that the 'novel' pangolin viruses would have been cultured a long time ago, adding: "Escape.. could happen from a lab and you would PROBABLY never know it."
@dasher8090 @virologyanon @CD57227 37. MERS & SC-2 FCS pathways via @NLink247
"MERS FCS could have rearranged for NRP1 & Semaphorin 3a cleavage motif mimicry from PRSVRSVP which matches most efficient binding peptides for NRP1 & then shifted for ACE2 specificity adopting RRAR which is.."
That means Pangolin Samples and Viral Isolates, not a zoo full of live pangolins LOL
39. Interesting FCS Update
@gadboit & @daouy15 claim the basic FCS in GX Pangolin MERS Cov isolates (MjHKU4r-CoV-1) held at WIV in 2019 would not have been able to give the FCS to SARS-COV-2.
However @gadboit suggests in this thread another possibility:
@gadboit @Daoyu15 @stevenemassey @humblesci 42. One thing they did find!
"Lam et al. (2020) sequenced a keratinous pangolin scale and derived the PCoV GD/P2S genome"
"We estimated 99.995% of reads had been filtered out, yet still contamination was detected with 10% of the reads matching the SARS-CoV-2 Wuhan-Hu-1 genome:
if this was SC2 contamination then it is in a very early Lineage A variant but it was sequenced in Guangzhou not Wuhan!
Human samples would have had C at 8782, not T
Evidence that the sample was not contaminated and that the FCS was present in the March 2019 samples
@gadboit @Daoyu15 @stevenemassey @humblesci @ydeigin @quay_dr 48. Now for Another Paper 😱
Forensic analysis of novel SARS2r-CoV identified in game animal datasets in China shows evolutionary relationship to Pangolin GX CoV clade and apparent genetic experimentation
@gadboit @Daoyu15 @stevenemassey @humblesci @ydeigin @quay_dr 49. Abstract and Conclusion
"The association of this novel CoV with both bat CoV and the Guangxi pangolin CoV (GX PCoV) clades is an important step towards identifying the origin of the GX PCoVs"
1. The long awaited 293 questions for Dr. Ralph Baric have finally been completed and shared! Long live the quest for truth! You are hereby invited to read the sharpest, most lethal 293-question dossier ever built.
1. "These tiny fragments were far smaller than cells and even smaller than many viruses. Some were close to the size of DNA strands. Under high magnification, she noticed small hooked shapes with sharp points.
✴️2. OVERLOOKED
"She realized that the plastic in human brains was not only present, but surprisingly small. The fragments were so tiny that common diagnostic tools could not detect them. Pathologists had likely been overlooking them for years."
"The two original samples showed a strong link between plastic particles and dementia. As Bearer expanded her work to ten more donated brains, she found plastic in every single one. None were free of synthetic fragments."
Unfortunately, there is no direct proof provided by Redfield in this new interview, but he cites engineering features, early data, and classified information.
🧵3. Summary of Redfield's Statements
(on SARS-CoV-2 Origins & Cover-Up)
He claims SARS-CoV-2 originated from GOF research in a lab and emphasizes a significant US role alongside China.
He views this as a major biosecurity failure with ongoing suppression of transparency.
"Of note, the spike protein of this novel bat coronavirus possesses a functional FCS at the S1/S2 junction with a unique amino acid sequence motif (RDAR) that differs from that found in SARS-CoV-2 (RRAR) by only 1 amino acid."
"The molecular biology capabilities of WIV & the genome assessment are consistent with the hypothesis that SARS-CoV-2 was a lab-engineered virus that was part of a bank of chimeric viruses in Zheng-Li Shi's laboratory at WIV that escaped from containment"
Between 2017 and 2019, WIV created full-length a infectious clone in pBAC-CMV using an unpublished bat Coronavirus genome as template (BatCoVX)
page 85
3. Hypothesis 3:
Between 2017 and 2019, WIV created chimeric Bat-CoV-X viruses using the pBACCMV-BCOVX backbone and swapping out key cassettes with other bat Coronaviruses (RBD, RBM, etc.) and adding additional features such as a furin cleavage site