How scientists turn a viral genetic sequence into a life-saving vaccine
In short: Developing a vaccine can take one to eighteen months, but the process is a masterpiece of biological engineering. By using genomic sequencers to map a virus and targeting specific proteins, researchers can create a blueprint that teaches our immune system to recognize a threat before it even arrives.
The journey begins with genomic sequencing. Early in the pandemic, researchers used state-of-the-art sequencers to map the SARS-CoV-2 virus, sharing the sequence globally to accelerate research. By analyzing this data through bioinformatics, scientists identified the spike protein gene as the ideal vaccine candidate. This protein is essential for the virus to attach to host cells, making it a perfect antigen for the immune system to target. This rapid identification allows for the immediate development of viable vaccine candidates. Once the sequence is understood, researchers can optimize the genetic code based on existing coronavirus studies.
In mRNA vaccine production, this spike protein gene is synthetically manufactured and inserted into a plasmid—a small, circular piece of DNA. Due to their reliable gene sequence containment and simple replication, plasmids offer high efficiency. A fresh plasmid can be manufactured in roughly two weeks after selecting a sequence. Using laboratory-based protocols, RNA polymerase transcribes the DNA into a single mRNA molecule, a process nearly identical to how human genes are transcribed. This method mimics our own biological processes. This efficiency allows for the rapid testing and distribution of new vaccines.
Because mRNA is a fragile molecule, it must be protected. Researchers package the mRNA into a fatty lipid bilayer, which protects it during shipping and helps it attach to human cells upon administration. However, this protection comes with logistical challenges; mRNA vaccines must be kept very cold to prevent degradation. While the full process of finding, testing, and approving a candidate can take one to eighteen months, during emergencies, timelines can be shortened by overlapping development steps and increasing financial investment in manufacturing. This bilayer ensures the mRNA is delivered efficiently to our cells. Distributing mRNA vaccines becomes more logistically complicated because of this.
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Sources
- Summary by Intellect · source: How to Make a COVID-19 Vaccine
- Also: COVID-19 mRNA Vaccine Production
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