Pfizer’s COVID-19 Vaccine Goes Into Liver Cells and Is Converted to DNA: Study

A nurse prepares the Pfizer COVID-19 vaccine in a file image. Jeff Kowalsky/AFP via Getty Images

The messenger RNA (mRNA) from Pfizer’s COVID-19 vaccine is able to enter human liver cells in a lab and is converted into DNA, according to Swedish researchers at Lund University.

The study used liver cancer cells grown in a laboratory setting, so the findings may not directly reflect how the process would occur in healthy human cells.

The researchers said that the study did not show that the converted DNA found its way into the genome.

Published in Current Issues of Molecular Biology, the study found that when the mRNA vaccine enters the human liver cells, it triggers  higher reverse transcription activity inside cells.

Transcription is a common and necessary cellular process where information contained in DNA is written into an RNA format. This information written in RNA would then be used to construct proteins, this is also the same process mRNA vaccines utilize to make spike proteins.

Reverse transcription is a less common process where the opposite happens, RNA gets written back into DNA form, and reverse transcription proteins are needed to make this happen.

When cancer cells were exposed to mRNA vaccines, the cells had a rise in reverse transcription activity. According to the study, the higher the vaccine content, the greater the activity.

Six hours after vaccine exposure, researchers found DNA sequences unique to the vaccine inside cells.

“ This study does not investigate whether the Pfizer vaccine alters our genome.” said study author Associate Professor Yang de Marinis in a later statement. “Our publication is the first in vitro study on the conversion of mRNA vaccine into DNA, inside cells of human origin. We show that the vaccine enters liver cells as early as 6 hours after the vaccine has been administered. We saw that there was DNA converted from the vaccine’s mRNA in the host cells we studied.”

A commentary by researcher Hamid Merchant gave some arguments for why the study’s findings may not translate to real-life, first of which was that the study was done in the lab. Experiments could have very different outcomes when conducted in the laboratory as compared to being conducted in a living organism. The study was conducted in cancer cells, which tend to have a greater DNA activity, and therefore may have favored reversed transcription as opposed to normal liver cells.

Professor Magnus Rasmussen, another of the study authors said:  “ These findings were observed in petri dishes under experimental conditions, but we do not yet know if the converted DNA is integrated into the cells’ DNA in the genome— and if so, if it has any consequences.”

This is the first time that researchers have shown in vitro or inside a petri dish how an mRNA vaccine is converted into DNA on a human liver cell line.

“The genetic material delivered by mRNA vaccines never enters the nucleus of your cells,” the CDC said on its web page titled “Myths and Facts about COVID-19 Vaccines.”

The CDC says that the “COVID-19 vaccines do not change or interact with your DNA in any way,” saying that all of the ingredients in both mRNA and viral vector COVID-19 vaccines (administered in the United States) are discarded from the body once antibodies are produced. These vaccines deliver genetic material that instructs cells to begin making spike proteins found on the surface of SARS-CoV-2 that causes COVID-19 to produce an immune response.

Pfizer didn’t comment on the findings of the Swedish study and said only that its mRNA vaccine does not alter the human genome.

“Our COVID-19 vaccine does not alter the DNA sequence of a human cell,” a Pfizer spokesperson told The Epoch Times in an email. “It only presents the body with the instructions to build immunity.”

More than 215 million or 64.9 percent of Americans are fully vaccinated as of Feb. 28, with 94 million having received a booster dose.

“At this stage, we do not know if DNA reverse transcribed from BNT162b2 is integrated into the cell genome. Further studies are needed to demonstrate the effect of BNT162b2 on genomic integrity, including whole genome sequencing of cells exposed to BNT162b2, as well as tissues from human subjects who received BNT162b2 vaccination,” the authors said.

This article has been updated to correct the scope of the claims of the study and its implications. A previous version incorrectly stated that the study showed that the DNA inside the nucleus of the liver cells was triggered to make mRNA. The study did not claim that reverse-transcribed DNA was present in the nucleus. The previous article also incorrectly said that the study found spike proteins were expressed on the surface of the liver cells. The Epoch Times regrets this error.