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Pathogenesis and Management of Citrin Deficiency
1Department of Pediatrics, Yamagata University School of Medicine, Japan.
Internal Medicine (Tokyo, Japan)
|November 12, 2023
Summary
Citrin deficiency (CD) is a genetic disorder impacting liver function and energy metabolism. Early diagnosis and treatment with medium-chain triglycerides (MCTs) and a low-carbohydrate diet are crucial for preventing severe complications.
Area of Science:
- Biochemistry
- Genetics
- Metabolic Disorders
Background:
- Citrin deficiency (CD) stems from SLC25A13 mutations, leading to neonatal intrahepatic cholestasis (NICCD), failure to thrive (FTTDCD), and adult-onset citrullinemia (CTLN2).
- Citrin, an aspartate-glutamate carrier in the liver, is vital for the malate-aspartate shuttle and glycolysis.
- Deficient citrin impairs hepatocyte glycolysis, de novo lipogenesis, and beta-oxidation due to downregulated PPARα, causing energy deficits.
Purpose of the Study:
- To elucidate the metabolic consequences of citrin deficiency.
- To highlight the therapeutic role of medium-chain triglycerides (MCTs) in managing CD.
- To emphasize the importance of prompt diagnosis and dietary intervention.
Main Methods:
- Analysis of metabolic pathways affected by citrin deficiency, including glycolysis and beta-oxidation.
- Evaluation of the impact of SLC25A13 mutations on hepatocyte function.
- Assessment of the efficacy of medium-chain triglyceride (MCT) supplementation.
Main Results:
- Citrin-deficient hepatocytes demonstrate primary defects in glycolysis and de novo lipogenesis, with secondary PPARα downregulation and impaired beta-oxidation.
- Hepatocytes are unable to efficiently utilize glucose and free fatty acids, leading to energy deficiency.
- MCT supplementation effectively provides energy, enhances lipogenesis, and activates the malate-citrate shuttle in CD.
Conclusions:
- Prompt diagnosis of CD and initiation of MCT supplementation with a minimal carbohydrate diet are essential.
- This intervention aims to prevent growth impairment and irreversible brain and liver damage.
- Early management improves quality of life for individuals with citrin deficiency.
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