The MDR1 gene, or Multi-Drug Resistance 1 gene, plays a crucial role in protecting the brain from harmful substances. It produces a protein known as P-glycoprotein, which acts like a gatekeeper — helping to pump certain medications and toxins out of the brain to prevent dangerous buildup. However, when this gene is mutated, the protective process fails, causing drugs to accumulate in the brain at toxic levels. This genetic mutation can be inherited from either parent, whether they carry one or two copies of the defective gene. Understanding the MDR1 gene is essential for pet owners and breeders alike, as it helps ensure the safe use of medications and supports informed decisions for the health and well-being of your pet.

What is the MDR1 Gene?
Multi-Drug Resistance 1 (MDR1) is a gene that is meant for helping to protect the brain. This gene specifically codes for P-glycoprotein, which is responsible for transporting certain drugs out of the brain. If this gene is mutated, it will create a defective protein, and consequently, drugs will remain and build up in the brain to toxic levels. This dominant gene is inherited from the parents, whether the parent has two copies of the gene or only one copy. If neither parent has a copy of the mutated MDR1 gene, then nor will the offspring.