Pathogenesis and pathophysiology of citrin (a mitochondrial aspartate glutamate carrier) deficiency.
Adult-onset type II citrullinemia (CTLN2), characterized by a liver-specific deficiency of urea cycle enzyme, argininosuccinate synthetase, is caused by mutations in SLC25A13 that encodes a calcium binding mitochondrial solute carrier protein, citrin. Citrin deficiency causes not only CTLN2 but also neonatal intrahepatic cholestasis caused by citrin deficiency at neonatal period. Moreover citrin and its isoform aralar were found to be aspartate glutamate carrier. From the viewpoint of the metabolic functions of citrin as aspartate glutamate carrier in urea synthesis and NADH shuttle, symptoms of CTLN2 and neonatal intrahepatic cholestasis caused by citrin deficiency are analyzed.
Saheki
Takeyori
T
Department of Biochemistry, Faculty of Medicine, Kagoshima University, Kagoshima, Japan. takesah@m.kufm.kagoshima-u.ac.jp
Kobayashi
Keiko
K
Iijima
Mikio
M
Nishi
Ikumi
I
Yasuda
Tomotsugu
T
Yamaguchi
Naoki
N
Gao
Hong Zhi
HZ
Jalil
Md Abdul
MA
Begum
Laila
L
Li
Meng Xian
MX
D002135:Calcium-Binding Proteins / Q000172:deficiency*; D002780:Cholestasis, Intrahepatic / Q000209:etiology / Q000235:genetics; D002956:Citrulline / Q000097:blood; D006801:Humans; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases / Q000209:etiology / Q000235:genetics; D026901:Membrane Transport Proteins / Q000235:genetics; D008661:Metabolism, Inborn Errors / Q000150:complications / Q000235:genetics; D033681:Mitochondrial Membrane Transport Proteins; D024101:Mitochondrial Proteins / Q000235:genetics; D009154:Mutation; D027361:Organic Anion Transporters / Q000172:deficiency*
D002135:Calcium-Binding Proteins; D026901:Membrane Transport Proteins; D033681:Mitochondrial Membrane Transport Proteins; D024101:Mitochondrial Proteins; D027361:Organic Anion Transporters; C119629:SLC25A13 protein, human; C008822:citrin; D002956:Citrulline