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Citrin Deficiency

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Human Pathobiochemistry

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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