Disorder of carnitine cycle and carnitine transport

Disorders of the carnitine cycle and carnitine transport are a group of rare inherited metabolic conditions that affect how the body uses fats for energy. Carnitine is a natural substance that acts like a shuttle, carrying fatty acids into the powerhouses of cells (called mitochondria) so they can be burned for fuel. When any step in this process is broken — whether it is the transport of carnitine into cells or the cycle that moves fats across the mitochondrial membrane — the body cannot properly convert fat into energy. This group includes several specific conditions such as Primary Carnitine Deficiency (also called Carnitine Uptake Defect or OCTN2 deficiency), Carnitine Palmitoyltransferase I deficiency (CPT1), Carnitine Palmitoyltransferase II deficiency (CPT2), Carnitine-Acylcarnitine Translocase deficiency (CACT), and others. Symptoms can vary widely depending on which specific disorder a person has, but commonly include muscle weakness, heart problems, low blood sugar, and liver enlargement. Some forms are life-threatening in infancy, while others may not appear until adulthood. Many affected individuals are identified through newborn screening programs before symptoms develop. Treatment typically involves dietary changes, avoiding fasting, and in some forms, carnitine supplementation. With early diagnosis and proper management, many patients can live relatively normal lives, though ongoing medical care is essential.

Bring these to your next appointment

• Q1.Which specific disorder within the carnitine cycle group does my child or I have, and what does that mean for treatment?,Do I or my child need to take L-carnitine supplements, and if so, what dose and how often?,What should I do if my child gets sick and cannot eat — when should I go to the emergency room?,Are there specific foods or activities we need to avoid, and what does a safe diet look like day to day?,Should other family members be tested for this condition?,How often do we need follow-up appointments, and which specialists should be on our care team?,Is there a written emergency protocol I can share with the school, emergency room, and other caregivers?

Common questions about Disorder of carnitine cycle and carnitine transport