India’s DNA vaccine is the first DNA vaccine for COVID-19. Find how it is made, the latest trial results, and when it will be available for the public.
We have already seen the various types of vaccines in our previous blogs and you can find them here. Diseases like the seasonal influenza virus, tetanus, polio, Hepatitis B, measles, mumps, rubella, cervical cancer, diphtheria, pertussis are usually prevented by DNA vaccines.
DNA vaccines are engineered to alter an individual’s genetic makeup. They code the DNA to identify antigens from a known virus and aid the immune system in producing antibodies following the detection of intrusions. They need to penetrate deep into the cell’s nucleus to be efficient whereas mRNA vaccines have to penetrate into the cytoplasm only.
Smallpox vaccine was the first DNA vaccine developed at the New York Department of Health by Enzo Paoletti and Dennis Panicali in 1983. These gene alterations pass on to the future generation too.
It is difficult to alter the DNA structure of an individual. DNA vaccines have so far been administered only on animals, especially horses. Most RNA and mRNA vaccine production were fast-tracked to provide the world with a cure for the pandemic. Therefore, only crucial aspects of the vaccines were analyzed during the clinical trial period.
Since DNA vaccines were not allowed for human trials, more than a dozen genetic vaccines are still under early trial stages. India and Japan’s vaccines have reached the last trial stage at present.
ZyCoV-D uses a circular plasmid strand in a promoter sequence to alter the gene structure. The vaccine was developed by Zydus Cadila, a pharmaceutical firm in Ahmedabad. The vaccine was tested on more than 28000 participants above the age of 12 following approval from India’s drug regulator. Zydus Cadila claims the trial showed around 67% efficacy but it has yet submitted a detailed report.
Though ZyCoV-D has shown only 67% efficacy compared to other mRNA vaccines that have delivered more than 90% efficacy. Shahid Jameel, a virologist at Ashoka University in Sonipat, India, explained that the vaccine was developed after the Delta plus variant, unlike the mRNA vaccines that hit the market well before the Alpha variant. Thus, these vaccines should not be compared with each other.
DNA based vaccines are administered either through:
The skin is the primary area of infection. Thus, ZyCoV-D is delivered to rich immune cells by being deposited under the skin tissue. Trials have shown a minimum requirement of three doses to reach initial protection. India’s DNA vaccines are speculated to hit the Indian drug market soon.
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