Scientists have made an important discovery that could change how we understand a common liver disease. A new study shows that a very small change in a person’s DNA may directly cause the illness in some cases.
The research was carried out by a team at the Mayo Clinic’s Center for Individualized Medicine and was published in the journal Hepatology.
The findings offer a new way of thinking about how this disease develops and why it affects so many people.
The condition is called metabolic dysfunction-associated steatotic liver disease, or MASLD. It was previously known as nonalcoholic fatty liver disease.
This disease happens when too much fat builds up in the liver, even in people who drink little or no alcohol. Over time, this buildup of fat can damage the liver and lead to serious health problems.
For many years, doctors believed that MASLD was mainly caused by lifestyle factors such as poor diet, lack of exercise, obesity, diabetes, and high cholesterol. Genetics was also thought to play a role, but it was usually seen as just one part of a larger picture.
This new study suggests that, in some people, a single gene change may be enough to cause the disease on its own.
The researchers focused on a gene called MET. Genes act like instructions inside our cells, guiding how the body works. The MET gene is important for helping the liver repair itself and manage fat properly.
When this gene does not function correctly, the liver cannot process fat as it should. As a result, fat starts to build up inside the liver. This can lead to inflammation, where the liver becomes irritated and damaged.
If the problem continues, the liver may develop scarring, a process known as fibrosis. In more serious cases, the scarring becomes severe and leads to cirrhosis. Cirrhosis is a dangerous condition in which the liver is badly damaged and cannot work properly. It can eventually lead to liver failure or liver cancer.
MASLD is very common and affects about one in three adults worldwide. A more serious form of the disease is called metabolic dysfunction-associated steatohepatitis, or MASH. This advanced stage is now one of the main reasons people need liver transplants in many countries.
The study was led by Dr. Filippo Pinto e Vairo. The research began when the team studied a woman and her father who both had MASH. What made their cases unusual was that they did not have the usual risk factors, such as diabetes or high cholesterol. This led the researchers to suspect that genetics might be the main cause in their case.
To investigate further, the scientists examined 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 impact 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 change disrupted the normal function of the MET gene. It caused the gene to send incorrect instructions, leading to problems with fat processing in the liver.
What makes this discovery even more important is that this exact mutation had never been reported before. This shows that there is still much to learn about how our genes affect our health.
The researchers also wanted to know if this gene problem might be present in other people. They used data from a large project called the Tapestry study, which includes genetic information from more than 100,000 people in the United States.
Among nearly 4,000 people with MASLD, about 1 percent had rare changes in the MET gene. Some of these changes were found in the same part of the gene as the mutation discovered in the original family. This strongly suggests that the MET gene plays an important role in this disease.
Experts believe this discovery could have a wide impact. It shows that rare genetic changes can sometimes cause diseases that appear to be very common.
This research also highlights the importance of personalized medicine. In the future, doctors may be able to use a person’s genetic information to better understand their condition and choose the most effective treatment.
Scientists are now hoping to develop treatments that target this specific gene problem. If people with this mutation can be identified early, it may be possible to slow down or even prevent the disease before it becomes severe.
Overall, this study represents a major step forward in understanding liver disease. It shows that even a very small change in our DNA can have a big effect on health. With further 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 that refined fiber is link to liver cancer, and the best and worst foods for liver health.
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