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Solute carrier family 22 (organic cation/ergothioneine transporter), member 4
Symbols SLC22A4; MGC34546; MGC40524; OCTN1
External IDs OMIM604190 MGI1353479 HomoloGene81701 GeneCards: SLC22A4 Gene
RNA expression pattern
PBB GE SLC22A4 205896 at tn.png
More reference expression data
Species Human Mouse
Entrez 6583 30805
Ensembl ENSG00000197208 ENSMUSG00000020334
UniProt Q9H015 Q5SWV1
RefSeq (mRNA) NM_003059 NM_019687
RefSeq (protein) NP_003050 NP_062661
Location (UCSC) Chr 5:
131.66 - 131.71 Mb
Chr 11:
53.83 - 53.87 Mb
PubMed search [1] [2]

Solute carrier family 22, member 4, also known as SLC22A4, is a human gene; the encoded protein is an ergothioneine transporter.[1]



The encoded protein is an integral protein of the plasma membrane containing 12 transmembrane segments. The first functional designation of this protein was OCTN1 ("organic cation transporter, novel, type 1"), but efficiency of transport for organic cations (e.g., tetraethylammonium) is very low.[2] The transport efficiency for carnitine is also negligible. Instead, the protein is responsible for the cotransport of sodium ions and ergothioneine, which is an antioxidant, into cells.[3] Thus, a more appropriate functional designation is ETT ("ergothioneine transporter").


SLC22A4 has been shown to interact with PDZK1.[4]

See also


  1. ^ "Entrez Gene: SLC22A4 solute carrier family 22 (ergothioneine transporter), member 4".  
  2. ^ Grigat S, Harlfinger S, Pal S, et al. (2007). "Probing the substrate specificity of the ergothioneine transporter with methimazole, hercynine, and organic cations". Biochem. Pharmacol. 74 (2): 309–16. doi:10.1016/j.bcp.2007.04.015. PMID 17532304.  
  3. ^ Gründemann D, Harlfinger S, Golz S, et al. (2005). "Discovery of the ergothioneine transporter". Proc. Natl. Acad. Sci. U.S.A. 102 (14): 5256–61. doi:10.1073/pnas.0408624102. PMID 15795384.  
  4. ^ Gisler, Serge M; Pribanic Sandra, Bacic Desa, Forrer Patrik, Gantenbein Andrea, Sabourin Luc A, Tsuji Akira, Zhao Zhuo-Shen, Manser Edward, Biber Jürg, Murer Heini (Nov. 2003). "PDZK1: I. a major scaffolder in brush borders of proximal tubular cells". Kidney Int. (United States) 64 (5): 1733–45. doi:10.1046/j.1523-1755.2003.00266.x. ISSN 0085-2538. PMID 14531828.  

Further reading

  • Xuan W, Lamhonwah AM, Librach C, et al. (2003). "Characterization of organic cation/carnitine transporter family in human sperm.". Biochem. Biophys. Res. Commun. 306 (1): 121–8. doi:10.1016/S0006-291X(03)00930-6. PMID 12788076.  
  • Yamada R, Tokuhiro S, Chang X, Yamamoto K (2005). "SLC22A4 and RUNX1: identification of RA susceptible genes.". J. Mol. Med. 82 (9): 558–64. doi:10.1007/s00109-004-0547-y. PMID 15184985.  
  • Silverberg MS (2006). "OCTNs: will the real IBD5 gene please stand up?". World J. Gastroenterol. 12 (23): 3678–81. PMID 16773684.  
  • Tamai I, Yabuuchi H, Nezu J, et al. (1998). "Cloning and characterization of a novel human pH-dependent organic cation transporter, OCTN1.". FEBS Lett. 419 (1): 107–11. doi:10.1016/S0014-5793(97)01441-5. PMID 9426230.  
  • Meyer-Wentrup F, Karbach U, Gorboulev V, et al. (1998). "Membrane localization of the electrogenic cation transporter rOCT1 in rat liver.". Biochem. Biophys. Res. Commun. 248 (3): 673–8. doi:10.1006/bbrc.1998.9034. PMID 9703985.  
  • Urakami Y, Okuda M, Masuda S, et al. (1998). "Functional characteristics and membrane localization of rat multispecific organic cation transporters, OCT1 and OCT2, mediating tubular secretion of cationic drugs.". J. Pharmacol. Exp. Ther. 287 (2): 800–5. PMID 9808712.  
  • Yabuuchi H, Tamai I, Nezu J, et al. (1999). "Novel membrane transporter OCTN1 mediates multispecific, bidirectional, and pH-dependent transport of organic cations.". J. Pharmacol. Exp. Ther. 289 (2): 768–73. PMID 10215651.  
  • Alcorn J, Lu X, Moscow JA, McNamara PJ (2002). "Transporter gene expression in lactating and nonlactating human mammary epithelial cells using real-time reverse transcription-polymerase chain reaction.". J. Pharmacol. Exp. Ther. 303 (2): 487–96. doi:10.1124/jpet.102.038315. PMID 12388627.  
  • Saito S, Iida A, Sekine A, et al. (2003). "Catalog of 238 variations among six human genes encoding solute carriers ( hSLCs) in the Japanese population.". J. Hum. Genet. 47 (11): 576–84. doi:10.1007/s100380200088. PMID 12436193.  
  • Strausberg RL, Feingold EA, Grouse LH, et al. (2003). "Generation and initial analysis of more than 15,000 full-length human and mouse cDNA sequences.". Proc. Natl. Acad. Sci. U.S.A. 99 (26): 16899–903. doi:10.1073/pnas.242603899. PMID 12477932.  
  • Eraly SA, Hamilton BA, Nigam SK (2003). "Organic anion and cation transporters occur in pairs of similar and similarly expressed genes.". Biochem. Biophys. Res. Commun. 300 (2): 333–42. doi:10.1016/S0006-291X(02)02853-X. PMID 12504088.  
  • Gisler SM, Pribanic S, Bacic D, et al. (2004). "PDZK1: I. a major scaffolder in brush borders of proximal tubular cells.". Kidney Int. 64 (5): 1733–45. doi:10.1046/j.1523-1755.2003.00266.x. PMID 14531806.  
  • Tokuhiro S, Yamada R, Chang X, et al. (2004). "An intronic SNP in a RUNX1 binding site of SLC22A4, encoding an organic cation transporter, is associated with rheumatoid arthritis.". Nat. Genet. 35 (4): 341–8. doi:10.1038/ng1267. PMID 14608356.  
  • Peltekova VD, Wintle RF, Rubin LA, et al. (2004). "Functional variants of OCTN cation transporter genes are associated with Crohn disease.". Nat. Genet. 36 (5): 471–5. doi:10.1038/ng1339. PMID 15107849.  
  • Kawasaki Y, Kato Y, Sai Y, Tsuji A (2005). "Functional characterization of human organic cation transporter OCTN1 single nucleotide polymorphisms in the Japanese population.". Journal of pharmaceutical sciences 93 (12): 2920–6. doi:10.1002/jps.20190. PMID 15459889.  
  • Gerhard DS, Wagner L, Feingold EA, et al. (2004). "The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC).". Genome Res. 14 (10B): 2121–7. doi:10.1101/gr.2596504. PMID 15489334.  
  • Newman B, Gu X, Wintle R, et al. (2005). "A risk haplotype in the Solute Carrier Family 22A4/22A5 gene cluster influences phenotypic expression of Crohn's disease.". Gastroenterology 128 (2): 260–9. doi:10.1053/j.gastro.2004.11.056. PMID 15685536.  

This article incorporates text from the United States National Library of Medicine, which is in the public domain.



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