In an important new study, researchers have found that a single small change in a person’s DNA may directly cause a common liver disease.
This finding comes from a team at Mayo Clinic’s Center for Individualized Medicine and offers a new way of understanding how this illness develops.
The disease is called metabolic dysfunction-associated steatotic liver disease, or MASLD. It was previously known as nonalcoholic fatty liver disease. This condition happens when too much fat builds up in the liver, even in people who do not drink much alcohol. Over time, this fat buildup can damage the liver and lead to serious health problems.
For many years, scientists believed that MASLD was caused by a mix of lifestyle factors and genetics. Things like poor diet, lack of exercise, obesity, diabetes, and high cholesterol were thought to play the biggest roles. Genetics was also considered important, but not usually as the main cause on its own.
This new study challenges that idea. It shows that, for some people, a single inherited gene change may be enough to trigger the disease.
The researchers discovered a rare mutation in a gene called MET. Genes are like instructions inside our cells that tell the body how to work. The MET gene is important for helping the liver repair itself and manage fat.
When this gene does not work properly, the liver cannot process fat as it should. As a result, fat begins to build up inside the liver. This buildup can cause inflammation, which means the liver becomes irritated and damaged.
If the problem continues over time, the liver can develop scars. This process is called fibrosis. In more serious cases, the damage becomes severe and leads to cirrhosis. Cirrhosis is a condition where the liver is heavily scarred and cannot function well. It can lead to liver failure or even liver cancer.
MASLD is very common. It affects about one in three adults around the world. A more serious form of the disease is called metabolic dysfunction-associated steatohepatitis, or MASH. This advanced stage is now one of the leading causes of liver transplants in many countries.
The study was led by Dr. Filippo Pinto e Vairo. He and his team first became interested in this problem when they studied a woman and her father. Both had MASH, but neither had the usual risk factors like diabetes or high cholesterol. This made the researchers suspect that something unusual was causing their disease.
To find answers, the team studied more than 20,000 genes in their DNA. They discovered a very small mutation in the MET gene. This mutation involved just a single change in the genetic code, but it had a large effect on how the liver handled fat.
To confirm their findings, the Mayo Clinic team worked with researchers from the Medical College of Wisconsin, led by Dr. Raul Urrutia. Together, they showed that this tiny mutation disrupted the normal function of the MET gene. It caused the gene to send incorrect instructions, which led to problems with fat processing in the liver.
What makes this discovery even more interesting is that this exact mutation had never been reported before in scientific records. This shows how much there is still to learn about the human body.
The researchers then wanted to know if this gene problem might affect more people. They used data from the Tapestry study, a large project that has collected genetic information from over 100,000 people in the United States.
Among nearly 4,000 people with MASLD in this study, about 1% had rare changes in the MET gene. Even more striking, some of these changes were found in the same part of the gene as the original family. This strongly supports the idea that the MET gene plays an important role in this disease.
Experts believe that this discovery could affect a large number of people worldwide. It also shows how rare genetic changes can sometimes cause diseases that appear to be common.
This research highlights the growing importance of personalized medicine. Instead of treating all patients the same way, doctors may one day use genetic information to better understand each person’s condition and choose the best treatment.
In the future, scientists hope to develop new treatments that target this specific gene problem. If doctors can identify people with this mutation early, they may be able to slow down or even prevent the disease before it becomes severe.
This study was published in the journal Hepatology. It represents a major step forward in understanding liver disease and shows how powerful modern genetic tools can be.
Overall, this discovery reminds us that even very small changes in our genes can have a big impact on health. With more research, these findings could lead to better care and new hope for people living with liver disease.
If you care about liver health, please read studies about simple habit that could give you a healthy liver, and common diabetes drug that may reverse liver inflammation.
For more information about health, please see recent studies about simple blood test that could detect your risk of fatty liver disease, and results showing this green diet may strongly lower non-alcoholic fatty liver disease.
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