Mayo Clinic Genetic Breakthrough Identifies Rare MET Gene Mutation as Direct Catalyst for Chronic Fatty Liver Disease

Mayo Clinic researchers identify a rare MET gene mutation that causes fatty liver disease, potentially affecting millions misdiagnosed with common MASLD.

By: AXL Media

Published: Mar 7, 2026, 6:18 AM EST

Source: The information in this article was sourced from Mayo Clinic

Redefining the Origins of Metabolic Liver Disease

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A landmark study from the Mayo Clinic Center for Individualized Medicine has challenged the traditional understanding of how fatty liver disease develops. Previously, medical consensus suggested that metabolic dysfunction-associated steatotic liver disease (MASLD) resulted from a complex interplay of lifestyle factors, such as diet, and general genetic susceptibility. However, new research published in the journal Hepatology demonstrates that a single, rare inherited mutation can serve as the primary driver for the condition. This discovery marks a significant shift toward viewing certain cases of chronic liver dysfunction through the lens of rare genetic disorders rather than purely lifestyle-driven ailments.

The Pathological Impact of MET Gene Disruption

The focus of the research centers on the MET gene, a critical component in the liver's ability to repair itself and regulate lipid metabolism. When a mutation occurs within this gene, the liver’s biological instructions are essentially rewritten, preventing it from processing fat efficiently. According to lead author Dr. Filippo Pinto e Vairo, this failure causes fat to accumulate within liver cells, triggering a cascade of secondary issues. Left unchecked, this accumulation leads to chronic inflammation, which eventually progresses to fibrosis and scarring. In advanced stages, the liver becomes stiff and dysfunctional, a state known as cirrhosis, which significantly increases the risk of liver cancer and organ failure.

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