Topic: Health

Scientists at Mayo Clinic have discovered a rare genetic variant that can directly cause fatty liver disease. This condition was previously thought to be caused by a mix of genetic and lifestyle factors.

Researchers at the Mayo Clinic's Center for Individualized Medicine found that in some cases, a single inherited mutation can play a central role in triggering metabolic dysfunction-associated steatotic liver disease (MAFLD). MAFLD is a condition where fat builds up inside liver cells, leading to inflammation and potentially serious health problems. The team identified the rare genetic variant in the MET gene, which plays an important role in liver repair and how the body processes fat.

When this gene does not function properly, fat begins to build up inside liver cells. This buildup can lead to inflammation, which over time can progress to fibrosis and scarring that stiffens the liver. In more advanced stages, the condition can develop into cirrhosis, which may cause permanent liver damage or even liver cancer.

The discovery began with genomic analysis of a woman and her father who both had MAFLD. Neither of them had diabetes or high cholesterol, two common risk factors associated with fat accumulation in the liver. The researchers performed an extensive genetic analysis, examining DNA across more than 20,000 genes. They identified a small but potentially meaningful alteration in the MET gene.

The research team confirmed that this mutation interfered with a critical biological process. Genes are made up of chemical letters that carry instructions for how the body functions. In this case, a single swapped letter within the DNA sequence disrupted the message, preventing the liver from properly processing fat.

Why It Matters

This discovery is important because it highlights the power of individualized medicine in identifying rare genetic variants and enabling targeted therapies. It also underscores the need for further research into the causes of MAFLD, which affects roughly one-third of adults worldwide.

Key Facts

• Scientists at Mayo Clinic have discovered a rare genetic variant that can directly cause metabolic dysfunction-associated steatotic liver disease (MAFLD).
• The MET gene plays an important role in liver repair and how the body processes fat.
• When this gene does not function properly, fat begins to build up inside liver cells, leading to inflammation and potentially serious health problems.
• The condition can progress to fibrosis and scarring that stiffens the liver, and in more advanced stages, it can develop into cirrhosis, which may cause permanent liver damage or even liver cancer.
• MAFLD affects roughly one-third of adults worldwide.

Key Terms

MET gene

A gene that plays an important role in liver repair and how the body processes fat.

Implications

This discovery is important because it highlights the power of individualized medicine in identifying rare genetic variants and enabling targeted therapies. It also underscores the need for further research into the causes of MAFLD, which affects roughly one-third of adults worldwide.