Major differences in how efficiently Omicron and other variants of the coronavirus multiply may help predict Omicron鈥檚 effects, researchers said on Wednesday.
Compared to the earlier Delta variant, Omicron multiplies itself 70 times more quickly in tissues that line airway passages, which may facilitate person-to-person spread, they said. But in lung tissues, Omicron replicates 10 times more slowly than the original version of the coronavirus, which might contribute to less-severe illness.
A formal report of the findings is under peer review for publication and has not been released by the research team.
In a news release issued by Hong Kong University, study leader Dr. Michael Chan Chi-wai said, 鈥淚t is important to note that the severity of disease in humans is not determined only by virus replication鈥� but also by each person鈥檚 immune response to the infection, which sometimes evolves into life-threatening inflammation.
Chan added, 鈥淏y infecting many more people, a very infectious virus may cause more severe disease and death even though the virus itself may be less pathogenic. Therefore, taken together with our recent studies showing that the Omicron variant can partially escape immunity from vaccines and past infection, the overall threat from Omicron variant is likely to be very significant.鈥�
Like couple holding hands
Meanwhile, a structural model of how the Omicron variant attaches to cells and antibodies sheds light on its behavior and will help in designing neutralizing antibodies, according to researchers.
Using computer models of the spike protein on Omicron鈥檚 surface, they analyzed molecular interactions occurring when the spike grabs onto a cell-surface protein called ACE2, the virus鈥檚 gateway into the cell.
Metaphorically, the original virus had a handshake with ACE2, but Omicron鈥檚 grip 鈥渓ooks more like a couple holding hands with their fingers entwined,鈥� said Joseph Lubin of Rutgers University in New Jersey.
The 鈥渕olecular anatomy鈥� of the grip may assist in explaining how Omicron鈥檚 mutations cooperate to help it infect cells, Lubin added.
The research team also modeled the spike with different classes of antibodies trying to attack it. The antibodies attack from different angles, 鈥渓ike a football team鈥檚 defense might tackle a ball carrier,鈥� with one person grabbing from behind, another from the front, Lubin said.
Some antibodies 鈥渁ppear likely to get shaken off鈥� while others are likely to remain effective. Booster vaccines raise antibody levels, resulting in 鈥渕ore defenders,鈥� which might compensate to some extent for 鈥渁 weaker grip of an individual antibody,鈥� Lubin said.
The findings, posted on Monday on the website bioRxiv ahead of peer review, need to be verified, 鈥減articularly with real-world samples from people,鈥� Lubin said. 鈥淲hile our molecular structure predictions are by no means a final word on Omicron, (we hope) they enable a faster and more effective response from the global community.鈥�