Katalin Karikó

Katalin Karikó is a scientist. She studies how our bodies work. She found a way to use tiny pieces of code to make medicine.

This code tells the body how to fight germs. It is put in tiny fat droplets. These droplets protect the code.

Her work helped make new vaccines. These vaccines helped people during a big sickness. Many people stayed well because of her ideas.

She worked very hard for a long time. She did not give up when things were tough. This helped her win a very big prize.

She is a teacher now. She wants others to love science too.

It is fun to learn!

Katalin Karikó is a famous scientist. She studies a special part of our cells. This part is called messenger RNA, or mRNA. mRNA acts like a set of instructions. These instructions tell our bodies how to make proteins.

For a long time, scientists had a big problem. Using mRNA as medicine caused bad reactions. The body thought the mRNA was a germ. It tried to fight it. Karikó worked with a scientist named Drew Weissman. They found a way to fix this. They changed small parts of the mRNA. This change helped the body accept the instructions. They also found a way to wrap the mRNA in tiny fat droplets. These are called lipid nanoparticles. The fat droplets protect the mRNA until it reaches the right spot.

This work helped make the COVID-19 vaccines. These vaccines helped people stay safe from a big sickness. Because of her hard work, Karikó won the Nobel Prize in 2023. She did not give up, even when it was hard to find money for her work.

Katalin Karikó is a famous biochemist who changed how we fight sickness. She specializes in studying messenger RNA, which is often called mRNA. You can think of mRNA as a set of tiny instructions. These instructions tell the cells in our bodies how to build proteins. Karikó wanted to use these instructions as a type of medicine. Her work helped create a new way to treat many different health problems. This discovery was a huge step forward for science and medicine.

For a long time, using mRNA was a very hard job. When scientists tried to use it, the body would react badly. The immune system thought the mRNA was a germ and tried to fight it. Karikó and her partner, Drew Weissman, found a clever way to fix this.

They discovered that they could change small parts of the mRNA. By replacing a part called uridine with something called pseudouridine, the body would not fight the instructions. They also learned how to wrap the mRNA in tiny fat droplets called lipid nanoparticles. These droplets act like a protective bubble to carry the mRNA safely into the body.

Karikó's journey to this discovery was not easy. She was born in 1955 in Hungary. She grew up in a small home in Kisújszállás that did not even have running water or a refrigerator. Even as a young student, she was very good at science and won awards for biology. In 1985, she moved to the United States with her husband and daughter. They even carried their money hidden inside a teddy bear. She worked at many places like Temple University and the University of Pennsylvania. Even when she faced many setbacks, she never stopped her research.

Many important facts come from her long career in science. In 1997, she began working with Drew Weissman at the University of Pennsylvania. Together, they worked on the chemical changes that make mRNA safe to use. This work led to the creation of the BioNTech and Moderna vaccines. These vaccines were very important in fighting the COVID-19 pandemic around the world. Because of this amazing work, Karikó and Weissman won the Nobel Prize in Physiology or Medicine in 2023. She has also won many other awards, like the Lasker–DeBakey Clinical Medical Research Award.

Today, Karikó's work connects to things we see in the news.

When people talk about mRNA vaccines, they are talking about her ideas. Her research helps doctors think of new ways to replace proteins in the body. This could lead to a whole new class of medicines in the future. She shows us that being persistent can lead to world-changing discoveries. Even when people doubted her, she kept looking for answers. Her story is a great example of how science helps everyone.

Katalin Karikó is a Hungarian and American biochemist whose research changed the field of medicine. She specializes in ribonucleic acid (RNA)-mediated mechanisms. Specifically, she focuses on in vitro-transcribed messenger RNA (mRNA). mRNA acts as a set of instructions for cells to build proteins. Karikó’s work laid the essential groundwork for using mRNA in protein replacement therapy. This research eventually allowed for the development of highly effective vaccines. Her persistence in a difficult scientific field led to a global medical breakthrough.

For many years, using synthetic mRNA in the human body was nearly impossible. When scientists injected mRNA, it triggered a strong inflammatory response. The body's immune system recognized the mRNA as a foreign threat and attacked it. Karikó discovered a way to solve this by studying transfer RNA (tRNA). She noticed that tRNA did not provoke the same immune reaction as mRNA. By comparing the two, she and her collaborator, Drew Weissman, found a chemical solution. They discovered that replacing the nucleoside uridine with pseudouridine could suppress the immune response. This modification made the mRNA non-immunogenic, meaning it would not trigger an unwanted attack from the body.

To make this technology work as a medicine, the mRNA must reach the right part of the body. Because mRNA is a very fragile molecule, it needs protection. Karikó worked on a delivery technique using lipid nanoparticles. These are tiny droplets made of fat that encapsulate the mRNA. The mixing process creates a dense particle that acts like a protective bubble. These nanoparticles shield the mRNA until it can reach its target area inside the cells. This delivery system was proven effective in animal studies and became a core part of modern vaccine technology.

Karikó's path to these discoveries was filled with significant professional obstacles. She earned her BSc in biology in 1978 and her PhD in biochemistry in 1982 from the University of Szeged. In 1985, she moved from Hungary to the United States to seek research opportunities. Her journey included working at Temple University and Johns Hopkins University. At the University of Pennsylvania, she faced intense skepticism regarding mRNA. Many researchers and companies doubted the potential of mRNA-based therapy. Because she struggled to secure grants, the university demoted her in 1995 and denied her tenure. Despite these setbacks, she refused to abandon her research.

In 1997, Karikó met immunologist Drew Weissman at the University of Pennsylvania. Their collaboration combined biochemistry with immunology to solve the problems of mRNA stability and immune response. Together, they developed the nucleoside modifications that are now protected by United States patents. Their work was eventually licensed by companies like BioNTech and Moderna. This technology was used to create the BioNTech/Pfizer and Moderna vaccines. These two vaccines were the most effective tools used to fight the SARS-CoV-2 virus. They contributed significantly to containing the COVID-19 pandemic worldwide.

Because of her life's work, Karikó has received many of the world's highest honors. In 2023, she and Drew Weissman were awarded the Nobel Prize in Physiology or Medicine. She has also received the Lasker–DeBakey Clinical Medical Research Award. In 2022, she won the Tang Prize Award in Biopharmaceutical Science. Time Magazine named her one of the Heroes of the Year in 2021. These awards recognize the massive impact her research has had on global health.

Today, Karikó's influence extends far beyond the COVID-19 pandemic. Her research into mRNA-mediated mechanisms is opening doors to a new class of drugs. This includes potential uses in generating pluripotent stem cells and advancing mRNA-based gene therapy. She has held leadership roles, including serving as a senior vice president at BioNTech RNA Pharmaceuticals. She also returned to her roots as a professor at the University of Szeged in Hungary. Her career demonstrates how dedicated research can eventually transform the entire landscape of human medicine.