The study, published in the journal Nature Immunology, was led by Dr. Annelies Zinkernagel and Dr. Clare Jolly. The team used a variety of techniques, including single-cell sequencing and imaging, to study how immune cells store and recall information about past infections.
They found that when a cell is infected with a virus, it produces DNA damage in response to the infection. This DNA damage is then repaired, but the cell retains a memory of the infection in the form of a specific pattern of DNA methylation. DNA methylation is a chemical modification of DNA that can alter gene expression.
The researchers found that this pattern of DNA methylation can be passed on to future generations of cells, even when the cells are not themselves infected with the virus. This means that the cells can remember the infection and mount a rapid and effective response if they are ever exposed to the virus again.
The team's findings could explain how the immune system is able to provide lifelong immunity to some infections. It also provides a potential new mechanism for understanding how the immune system contributes to age-related diseases, such as cancer and Alzheimer's disease.
"Our study provides new insights into how the immune system remembers infections," said Dr. Zinkernagel. "This knowledge could lead to new ways to prevent and treat infectious diseases."
"We were surprised to find that cells can store information about past infections for such a long time," said Dr. Jolly. "This suggests that the immune system has a very sophisticated memory mechanism that allows it to protect us from infections throughout our lives."
