Inborn errors of carbohydrate metabolism

Area of Science:

• Biochemistry
• Genetics
• Pediatrics

Background:

• Inborn errors of carbohydrate metabolism are common genetic disorders.
• Glycogen storage diseases (GSD) and disorders of galactose/fructose metabolism are key examples.
• These conditions significantly impact patient health, particularly liver function and glucose regulation.

Purpose of the Study:

• To review current knowledge on clinical manifestations, diagnostic approaches, and therapeutic strategies for GSD and inborn errors of galactose and fructose metabolism.
• To highlight key findings and management principles for common types of these metabolic disorders.

Main Methods:

• Review of existing literature on glycogen storage diseases and inborn errors of galactose and fructose metabolism.
• Focus on clinical symptoms, diagnostic methods (including mutation analysis), and treatment options.
• Discussion of management strategies like dietary interventions and liver transplantation.

Main Results:

• Hepatomegaly and hypoglycemia are characteristic of liver-involved GSD types I, III, and IX.
• Non-invasive investigations, such as mutation analysis, are crucial for diagnosis.
• Treatment for GSD I involves carbohydrate-balanced diets, frequent feeding, and corn starch; liver transplantation is reserved for high-risk patients.
• Newborn screening for classical galactosaemia is widespread, with lactose-free formula being vital.
• Hereditary fructose intolerance requires a strict fructose-restricted diet.

Conclusions:

• Effective management of carbohydrate metabolism disorders relies on accurate diagnosis and tailored treatment plans.
• Dietary modifications are fundamental, with interventions ranging from specialized formulas to strict dietary restrictions.
• Liver transplantation is a viable but high-risk option for severe GSD cases.
• Early detection through newborn screening programs significantly improves outcomes for conditions like galactosaemia.