@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"
Short 🧵on Primer & PCR Test issues (Pangolin Covs)
1. The key issue with pangolins and Pcovs is that:
It was discovered that the standard PCR tests used in 2020, and often still used, failed to actually detect many of the betacoronaviruses generously hosted by the pangolins.
2. Unless
The samples are retested with bespoke primers & more accurate PCR tests available now,
We will not know exactly whIch Pangolin (or bat) coronaviruses were hosted by Pangolins at WIV & elsewhere pre-pandemic.
However, "they" (I will name who they are later) should, and perhaps in the future, may retest the stored samples at WIV, IPB, SCAU AND GIABR, to clarify the question of which coronaviruses were present in their pangolin samples.
2. May have been for research and commercial purposes, but they were caught bang to rights.
"LIU initially stated that he did not know what the materials were and that someone must have put them into his bag"
3. When asked why someone would put them into his bag, LIU stated that he did not know, and that maybe he had accidentally put the materials there. After further questioning, LIU acknowledged that the materials were different strains of the pathogen Fusarium graminearum
1. Remote truck drone swarm bombings are here to stay!
The techniques will be improved and nowhere will be safe unless underground.
Questions to consider:
How many panel vans, transit vans and small trucks are there in a big city at any one time?
2. This is a revolution in sabotage tactics
Welcome to the future of air bases!
Without concrete and earth roofed revetments, aircraft are sitting ducks.kyivpost.com/post/53749
3. The "good old days"
"clandestine antiaircraft devices using gallium metal pencils which when applied to aircraft results In destruction due to stress failure at the point of application"
GREAT REVOLT SCHEME. SECRET PLANS OF THE THIRD INTERNATIONAL. BOLSHEVISING BULGARIA. A BALKAN FRONT. SPENDTHRIFT MURDERER. SPENDS AMILLION FRANCS IN FOURTEEN DAYS. MENUS OF LONDON'S ZOO. MR. CHURCHILL'S BUDGET. HAKKAS AND HOKLOS. PITCHED BATTLE AT PING CHAU.
More stories!
CANTON SITUATION. SPORT IN THE FAR EAST. GERMAN DISARMAMENT. BRITISH SILK DUTIES. COTTON SPINNERS. WORKING WEEK DISPUTE NOT YET SETTLED. FATE OF AMUNDSEN. MR. HAMMER IS MAKING PLANS FOR RESCUE. THE SOFIA OUTRAGE. POSITIONS FOR TROTZKY. THE EPSOM DERBY.
In this enlightened year of our Lord 2025 I, a humble observer of mankind’s ceaseless quest for health, find myself much struck by the ingenious practices of the Orient..
🧵2. A Scaly Panacea
...where the pangolin, that scaly denizen of subtropical climes, hath been elevated to a panacea most wondrous.
The Baicao Chinese Medicine compendium, a veritable gospel of herbal wisdom, doth proclaim the virtues of this creature’s scales...
🧵3. Humanity's Salvation?
...harvested with a diligence that would shame the most ardent of alchemists.
I propose, therefore, a modest scheme to amplify this noble tradition, ensuring that the pangolin’s sacrifice might serve the greater good of humanity.