Genetic variants of patatin like phospholipase domain containing 3 gene in prognosis and treatment of different diseases: a narrative review

The PNPLA3 gene, especially its I148M variant, has drawn growing interest, because of the many ways it influences health, particularly when it comes to fat metabolism in the liver and beyond. This review explores how genetic differences in PNPLA3 can help explain why some people are more likely to develop conditions like fatty liver disease, liver inflammation, cirrhosis, and even liver cancer, while others are not, even when their lifestyle is similar. The I148M variant, one of the most studied in this gene, appears to disrupt how the body handles fat, especially in the hepatocytes. Instead of breaking down TGs (TGs) efficiently, the hepatocyte ends up accumulating fat. Over time, this can lead to inflammation and scarring, and in some cases, liver cancer. What makes this gene even more interesting is how it interacts with factors like diet, alcohol, obesity, and insulin resistance, amplifying their effects on liver health in people who carry the risky version of the gene. However, PNPLA3 does not only matter for the liver. Current research shows that it might also play a role in kidney disease, possibly through similar mechanisms involving fat buildup, oxidative stress, and low-grade inflammation. Some studies have even found connections between this gene and extrahepatic cancer development, by way of disrupted lipid signaling and immune response. Interestingly, the effect of PNPLA3 on the heart and blood vessels are more complicated. While it increases liver fat, it might paradoxically offer some protection against heart disease. This raises important questions, especially now that therapies targeting PNPLA3 are being developed. One such treatment has already shown early promise in lowering liver fat, but we still need to better understand its long-term impact on other organs. What stands out is that PNPLA3 is more than just a liver gene. It seems to be a central player in how the body processes fats, responds to metabolic stress, and deals with inflammation. By studying this gene in depth, we are learning not just about who gets sick and why, but also how we might treat and even prevent some of the most common chronic diseases of our time. As research continues, PNPLA3 may offer new ways to personalize care and guide future treatments across a wide range of conditions.