Is MDR3 Deficiency hereditary?

MDR3 Deficiency is a rare genetic disorder that affects the liver's ability to secrete bile into the digestive system. This condition is caused by mutations in the ABCB4 gene, which provides instructions for making a protein called multidrug resistance 3 (MDR3). MDR3 is responsible for transporting a type of fat called phospholipids from liver cells into bile, which is necessary for proper digestion and absorption of fats.

MDR3 Deficiency is hereditary and follows an autosomal recessive pattern of inheritance. This means that an individual must inherit two copies of the mutated ABCB4 gene, one from each parent, to develop the disorder. If both parents are carriers of the mutated gene, there is a 25% chance with each pregnancy that their child will have MDR3 Deficiency.

It is important to note that individuals who inherit only one copy of the mutated gene are considered carriers and typically do not show symptoms of the disorder. However, carriers have a 50% chance of passing the mutated gene to their children.

Diagnosis of MDR3 Deficiency involves genetic testing to identify mutations in the ABCB4 gene. Additionally, liver function tests, imaging studies, and liver biopsies may be performed to assess the extent of liver damage and rule out other liver diseases.

Treatment for MDR3 Deficiency focuses on managing symptoms and preventing complications. This may include medications to improve bile flow, dietary modifications to reduce fat intake, and vitamin supplementation. In severe cases, liver transplantation may be necessary.