Abstract Sodium taurocholate cotransporting polypeptide (NTCP) deficiency is an inborn error of bile acid metabolism caused by mutations of SLC10A1 gene. This paper reports the clinical and genetic features of a patient with this disease. A 3.3-month-old male infant was referred to the hospital with the complaint of jaundiced skin and sclera over 3 months. Physical examination revealed moderate jaundice of the skin and sclera. The liver was palpable 3.5 cm below the right subcostal margin with a medium texture. Serum biochemistry analysis revealed markedly elevated bilirubin (predominantly direct bilirubin) and total bile acids (TBA), as well as decreased 25-OH-VitD level. On pathological analysis of the biopsied liver tissue, hepatocyte ballooning and cholestatic multinucleate giant cells were noted. The lobular architecture was distorted. Infiltration of inflammatory cells, predominantly lymphocytes, was seen in the portal tracts. In response to the anti-inflammatory and liver protective drugs as well as fat-soluble vitamins over 2 months, the bilirubin and transaminases levels were improved markedly while the TBA kept elevated. Because of persisting hypercholanemia on the follow-up, SLC10A1 gene analysis was performed at his age of 17.2 months. The child proved to be a homozygote of the reportedly pathogenic variant c.800C > T (p. Ser267Phe), while the parents were both carriers. NTCP deficiency was thus diagnosed. The infant was followed up until 34.3 months old. He developed well in terms of the anthropometric indices and neurobehavioral milestones. The jaundice disappeared completely. The liver size, texture and function indices all recovered. However, the hypercholanemia persisted, and the long-term outcome needs to be observed.
LI Hua,QIU Jian-Wu,LIN Gui-Zhi et al. Clinical and genetic analysis of a pediatric patient with sodium taurocholate cotransporting polypeptide deficiency[J]. CJCP, 2018, 20(4): 279-284.
LI Hua,QIU Jian-Wu,LIN Gui-Zhi et al. Clinical and genetic analysis of a pediatric patient with sodium taurocholate cotransporting polypeptide deficiency[J]. CJCP, 2018, 20(4): 279-284.
Hagenbuch B, Meier PJ. Molecular cloning, chromosomal localization, and functional characterization of a human liver Na+/bile acid cotransporter[J]. J Clin Invest, 1994, 93(3):1326-1331.
[2]
Hallén S, Mareninova O, Branden M, et al. Organization of the membrane domain of the human liver sodium/bile acid cotransporter[J]. Biochemistry, 2002, 41(23):7253-7266.
[3]
Shiao T, Iwahashi M, Fortune J, et al. Structural and functional characterization of liver cell-specific activity of the human sodium/taurocholate cotransporter[J]. Genomics, 2000, 69(2):203-213.
[4]
Hagenbuch B, Dawson P. The sodium bile salt cotransport family slc10[J]. Pflugers Arch, 2004, 447(5):566-570.
[5]
Anwer MS, Stieger B. Sodium-dependent bile salt transporters of the SLC10A1 transporter family:more than solute transporters[J]. Pflugers Arch, 2014, 466(1):77-89.
[6]
Vaz FM, Paulusma CC, Huidekoper H, et al. Sodium taurocholate cotransporting polypeptide (SLC10A1) deficiency:conjugated hypercholanemia without a clear clinical phenotype[J]. Hepatology, 2015, 61(1):260-267.
[7]
Liu R, Chen C, Xia X, et al. Homozygous p.Ser267phe in SLC10A1 is associated with a new type of hypercholanemia and implications for personalized medicine[J]. Sci Rep, 2017, 7(1):9214.
[8]
Deng M, Mao M, Guo L, et al. Clinical and molecular study of a pediatric patient with sodium taurocholate cotransporting polypeptide deficiency[J]. Exp Ther Med, 2016, 12(5):3294-3300.
[9]
Van Herpe F, Waterham HR, Adams CJ, et al. NTCP deficiency and persistently raised bile salts:an adult case[J]. J Inherit Metab Dis, 2017, 40(3):313-315.
[10]
Qiu JW, Deng M, Cheng Y, et al. Sodium taurocholate cotransporting polypeptide (ntcp) defciency:Identifcation of a novel SLC10A1 mutation in two unrelated infants presenting with neonatal indirect hyperbilirubinemia and remarkable hypercholanemia[J]. Oncotarget, 2017, 8(63):106598-106607.
Lu YB, Kobayashi K, Ushikai M, et al. Frequency and distribution in east asia of 12 mutations identified in the SLC25A13 gene of japanese patients with citrin deficiency[J]. J Hum Genet, 2005, 50(7):338-346.
[14]
Tabata A, Sheng JS, Ushikai M, et al. Identification of 13 novel mutations including a retrotransposal insertion in SLC25A13 gene and frequency of 30 mutations found in patients with citrin deficiency[J]. J Hum Genet, 2008, 53(6):534-545.
[15]
Van Dyke RW, Stephens JE, Scharschmidt BF. Bile acid transport in cultured rat hepatocytes[J]. Am J Physiol, 1982, 243(6):G484-G492.
[16]
Hagenbuch B, Meier PJ. The superfamily of organic anion transporting polypeptides[J]. Biochim Biophys Acta, 2003, 1609(1):1-18.
[17]
Ferdinandusse S, Denis S, Dacremont G, et al. Toxicity of peroxisomal c27-bile acid intermediates[J]. Mol Genet Metab, 2009, 96(3):121-128.
