I was planning on writing a more detailed post, complete with images and citations, but I’ll be honest, I don’t have the energy or time right now, so this will be simpler than I’d like.

One of the claims some people have made about the mRNA based Covid vaccines is that they alter your DNA. This basically isn’t possible. But I want to delve a bit into why.

We’ll start with something often called the Central Law or Dogma of Molecular Biology. I’m going to paraphrase it at first: Information passes from DNA to RNA to Proteins and never in the opposite direction. I’ll explain why this is mostly true and why it is vitally important to understand when it comes to the mRNA based proteins. But first, some definitions.

We’re all probably familiar with DNA, the double-helix first observed and described by Rosalind Franklin and later better described by Francis Crick and James Watson. This is where genetic information is stored. In computers, we think of data as stored as bits, 1s and 0s. DNA is similar, each “lattice” in the ladder is made up of a pair of AT (Adenine/Thymine) or GC (Guanine/Cytosine) molecules know as base pairs. Whereas in computers we’re often dealing with bytes which is a group of 8 bits, DNA is grouped as three base pairs at time.

Image courtesy of Wikipedia.

But what’s the purpose of these three base pairs? I’m going to overly simplify, but an entire strand of them makes up a chromosome. (Humans have 46, 22 “identical” strands and then a set of XX or XY strands. Identical is in quotes because sometimes when replicated, errors can creep in creating a mutation. And of course some people have more than 2 of each, such as Trisomy 21, aka Down Syndrome, or even XXY, or can be missing one of the pair, such as X0. But that’s beyond this post.)

But three base pairs together can encode later for amino acids. Amino acids make up proteins.

Within each chromosome are multiple genes. Genes are what make you look like you and be human. You have genes for example that control your blood type, hair color, and more.

That said, two things can happen to DNA: Replication and transcription.

Replication is necessary when a cell divides and basically the entire chromosome is duplicated so each cell has a copy. This is extremely interesting in and of itself, but again, beyond the scope of this article.

What we care about here is transcription. This is when part of the chromosome, specifically a specific gene is accessed in order to make a protein. This can get fairly complex and honestly, we’re learning new details about how genes can be activated and used all the time. (For example, so called “Junk DNA”, i.e. areas that don’t encode for genes, turns out that can be very important too and it’s not junk.)

So, before I can get into why mRNA vaccines can’t alter your DNA, let’s dive into a bit more how a protein is made and how this related to vaccines.

An important detail to keep in mind here is that in what are called eukaryotic cells (which is what makes up almost all multicellular creatures, including you) chromosomes are within the nucleus of the cell. It’s difficult for anything to get in or out. Basically there’s a wall around them with closely guarded gates.

That said, the nucleus receives a signal that a particular protein is needed. So, the particular chromosome, which is normally very tightly wound unwinds at the location of the gene needed for that protein. Then a special enzyme (and they are different between eukaryotic and prokaryotic cells i.e. single cell bacteria and the like) called RNA Polymerase that starts to “walk” the gene and create what’s known as Messenger RNA or mRNA (see we’d get to this eventually).

When it’s done reading, this new strand of mRNA leaves the nucleus and goes into the cytoplasm of the body of the cell. There, “molecular machines” known as ribosomes will latch onto it. These actually come in two sizes, large and small. You have millions of these in each of your cells. When a piece of mRNA is floating around a large and small ribosome will clamp to the “start” end and start to read it. As they read it three base pairs at a time, they will attach the amino acid that matches that 3 base pair encoding. This amino acid is brought to the ribosome unit via something known as Transfer RNA or tRNA. Once the end of the mRNA is read, the ribosomes come apart and the mRNA may be read again or destroyed. (I won’t get into the signaling factors that control this, but the key part is eventually all mRNA gets destroyed and its base pairs typically used for other purposes.)

The created protein may undergo other transformations and be moved to other locations within the cell, to the surface of the cell, or even ejected from the cell.

And that his how a protein is made. Notice the direction matches what I said above DNA->RNA->Protein. It’s one way.

But what keeps it from going the other way? That’s really the question here.

Let’s start by stating up front that your DNA DOES in fact contain genes that apparently came from viruses. So that central law obviously has an exception. But what makes that exception?

Specifically it’s an enzyme known as Reverse Transcriptase. Humans sort of have a form of this, but it’s used for a very specific (controlling telomere length during replication). There are a few other weird things that could do something like this, but basically for the mRNA Covid vaccines they don’t. The simplistic reason is that the mRNA vaccines don’t include the encoding that is required for Reverse Transcriptase to start its work. It’s sort of like a guard asking for the password to get into a military base. If you don’t have it, you’re not getting in.

Moreover, an mRNA vaccine encodes for a specific protein or proteins. That’s it. It doesn’t contain enzymes like Reverse Transcriptase, nor do the mRNA segments contain the encoding to allow for any form of reverse transcriptase. Even if somehow DNA was formed from them, it would then have to make its way into the nucleus (which is very difficult to do) AND the be incorporated into an existing chromosome. This just beyond the point of believability.

But, let’s say somehow it DOES happen. You know what the most likely result is? Nothing. Your body has no reason to activate such a gene. It would sit there like other inactive genes doing nothing.

So, for those who read this far, or who skipped the end, your cells and the mRNA vaccine for Covid simply does NOT possess the mechanisms to incorporate the the vaccine into your cells and even if it did, the net result if anything would be nothing.