Abstract
Citrin deficiency arises from biallelic mutations in SLC25A13 gene, and can manifest in newborns or infants as neonatal intrahepatic cholestasis caused by citrin deficiency (NICCD), in older children as failure to thrive and dyslipidemia caused by citrin deficiency (FTTDCD), and in adults as adult-onset citrullinemia type II (CTLN2). The diagnosis of citrin deficiency is based on characteristic biochemical findings and identification of biallelic pathogenic variants in SLC25A13 gene. Lactose-free and medium-chain triglycerides (MCT)-enriched formula and fat-soluble vitamins yield satisfactory outcomes in most NICCD cases. For FTTDCD, besides dietary treatment, sodium pyruvate may improve growth. For CTLN2, liver transplantation is effective, but arginine, sodium pyruvate, and MCT oil may delay the need for liver transplantation.
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Abbreviations
- 4-HPL:
-
 4-Hydroxyphenyllactate
- 4-HPPV:
-
 4-Hydroxyphenylpyruvate
- ABC:
-
 ATP-binding cassette
- ABCG5/8:
-
ATP-binding cassette, subfamily G, member 5/8
- AFP:
-
α-Fetoprotein
- Ag:
-
Antigen
- AGC:
-
Aspartate-glutamate carrier
- ALP:
-
Alkaline phosphatase
- ALT:
-
Alanine aminotransferase
- ASS:
-
Argininosuccinate synthetase
- AST:
-
Aspartate aminotransferase
- BSEP:
-
Bile salt export pump
- CMV:
-
Cytomegalovirus
- CTLN1:
-
Argininosuccinate synthetase deficiency or classical citrullinemia
- CTLN2:
-
Adult-onset type II citrullinemia
- FTTDCD:
-
Failure to thrive and dyslipidemia caused by citrin deficiency
- GC-MS:
-
Gas chromatography-mass spectrometry
- GGT:
-
γ-Glutamyltransferase
- MCFA:
-
Medium-chain fatty acid
- MCT:
-
Medium-chain triglyceride
- MRD3:
-
Multidrug-resistant protein 3
- MS-MS:
-
Tandem mass spectrometry
- NICCD:
-
Neonatal intrahepatic cholestasis caused by citrin deficiency
- ORF:
-
Open reading frame
- TBA:
-
Total bile acids
- Tbil/Dbil:
-
Total bilirubin/direct bilirubin
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Song, YZ., Yazaki, M., Saheki, T. (2019). Citrin Deficiency. In: Oohashi, T., Tsukahara, H., Ramirez, F., Barber, C., Otsuka, F. (eds) Human Pathobiochemistry. Springer, Singapore. https://doi.org/10.1007/978-981-13-2977-7_1
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DOI: https://doi.org/10.1007/978-981-13-2977-7_1
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