Abstract
Deficiency of citrin due to mutations of the SLC25A13 gene causes adult-onset type II citrullinemia (CTLN2) and one type of neonatal intrahepatic cholestasis (NICCD). About half of the NICCD patients are detected based on high galactose, phenylalanine, and/or methionine concentrations on newborn mass screening (NMS). To clarify the perinatal and neonatal effects and the inconsistent results on NMS, we examined aminograms, the levels of bile acids and galactose in dried blood spots for NMS from 20 patients with NICCD. Birth weight was low for gestational age (−1.4 ± 0.7 SD). Affected fetuses may have suffered intrauterine citrin deficiency. The first abnormality detected after birth was citrullinemia, and 19 of 20 patients had citrulline levels higher than +2 SD of controls. Tyrosine, phenylalanine, methionine, galactose, and bile acids were less affected than citrulline on d 5 after birth. Galactose and bile acids levels were increased at 1 mo in comparison with d 5 after birth due to impairment of the cytosolic NADH reducing–equivalent supply into mitochondria of hepatocytes. Patients with negative findings on NMS had low levels of total 20 amino acids. Citrulline/serine, citrulline /leucine plus isoleucine, and citrulline/total amino acids ratios, controlled for the confounding effect of low amount of total amino acids, were higher in all patients than +2 SD, +2 SD, and +3 SD of controls, respectively. NMS for citrin deficiency (frequency of homozygote with SLC25A13 mutation: 1/10,000–1/38,000 in East Asia) will be useful for clarification of the clinical course, treatment, and prevention of this disease.
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Abbreviations
- CTLN2:
-
adult-onset type II citrullinemia
- NICCD:
-
neonatal intrahepatic cholestasis caused by citrin deficiency
- NMS:
-
newborn mass screening
References
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Supported by grants from the Ministry of Health Sciences and Welfare of Japan, by a Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science, and by funds from Suyama Research Foundation.
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Tamamori, A., Fujimoto, A., Okano, Y. et al. Effects of Citrin Deficiency in the Perinatal Period: Feasibility of Newborn Mass Screening for Citrin Deficiency. Pediatr Res 56, 608–614 (2004). https://doi.org/10.1203/01.PDR.0000139713.64264.BC
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DOI: https://doi.org/10.1203/01.PDR.0000139713.64264.BC
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