Membrane-associated transporter protein

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AliasesSLC45A2, 1A1, AIM1, MATP, OCA4, SHEP5, solute carrier family 45 member 2
External IDsOMIM: 606202 MGI: 2153040 HomoloGene: 9412 GeneCards: SLC45A2
Gene location (Human)
Chromosome 5 (human)
Chr.Chromosome 5 (human)[1]
Chromosome 5 (human)
Genomic location for SLC45A2
Genomic location for SLC45A2
Band5p13.2Start33,944,623 bp[1]
End33,984,693 bp[1]
RNA expression pattern
PBB GE SLC45A2 221644 s at fs.png

PBB GE SLC45A2 220245 at fs.png
More reference expression data
RefSeq (mRNA)



RefSeq (protein)



Location (UCSC)Chr 5: 33.94 – 33.98 MbChr 15: 11 – 11.03 Mb
PubMed search[3][4]
View/Edit HumanView/Edit Mouse

Membrane-associated transporter protein (MATP), also known as solute carrier family 45 member 2 (SLC45A2) or melanoma antigen AIM1, is a protein that in humans is encoded by the SLC45A2 gene.[5][6][7]

In human, the SLC45A2 gene is located on the short (p) arm of chromosome 5 at position 13.2.


SLC45A2 is a transporter protein that mediates melanin synthesis. SLC45A2 is also a melanocyte differentiation antigen that is expressed in a high percentage of melanoma cell lines.[8] A similar sequence gene in medaka fish, 'B,' encodes a transporter that mediates melanin synthesis. Mutations in this gene are a cause of oculocutaneous albinism type 4. Alternative splicing results in multiple transcript variants encoding different isoforms.[7] Protein expression is localized to the melanosome, and analysis of the by knockdown of RNA expression leads to altered melanosome pH potentially altering tyrosinase function by affecting copper binding.[9]

In melanocytic cell types, the SLC45A2 gene is regulated by microphthalmia-associated transcription factor.[10][11]

SLC45A2 has been found to play a role in pigmentation in several species. In humans, it has been identified as a factor in the light skin of Europeans and as an ancestry-informative marker (AIM) for distinguishing Sri Lankan from European ancestry.[12] SLC45A2 is the so-called cream gene responsible in horses for buckskin, palomino and cremello coloration, while a mutation in this gene underlies the white tiger variant.[13] In dogs a mutation to this gene causes white fur, pink skin, and blue eyes.[14] SLC45A2 was identified as a melanoma tumor-associated antigen with high tumor specificity and reduced potential for autoimmune toxicity, and is currently in clinical development as a target for T-cell based immunotherapy.[15]

See also[edit]


  1. ^ a b c ENSG00000164175 GRCh38: Ensembl release 89: ENSG00000281919, ENSG00000164175 - Ensembl, May 2017
  2. ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000022243 - Ensembl, May 2017
  3. ^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. ^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  5. ^ Nakayama K, Fukamachi S, Kimura H, Koda Y, Soemantri A, Ishida T (Mar 2002). "Distinctive distribution of AIM1 polymorphism among major human populations with different skin color". Journal of Human Genetics. 47 (2): 92–4. doi:10.1007/s100380200007. PMID 11916009.
  6. ^ Newton JM, Cohen-Barak O, Hagiwara N, Gardner JM, Davisson MT, King RA, Brilliant MH (November 2001). "Mutations in the human orthologue of the mouse underwhite gene (uw) underlie a new form of oculocutaneous albinism, OCA4". American Journal of Human Genetics. 69 (5): 981–8. doi:10.1086/324340. PMC 1274374. PMID 11574907.
  7. ^ a b "Entrez Gene: SLC45A2 solute carrier family 45, member 2".
  8. ^ Harada M, Li YF, El-Gamil M, Rosenberg SA, Robbins PF (February 2001). "Use of an in vitro immunoselected tumor line to identify shared melanoma antigens recognized by HLA-A*0201-restricted T cells". Cancer Research. 61 (3): 1089–94. PMID 11221837.
  9. ^ Bin BH, Bhin J, Yang SH, Shin M, Nam YJ, Choi DH, et al. (2015). "Membrane-Associated Transporter Protein (MATP) Regulates Melanosomal pH and Influences Tyrosinase Activity". PLOS ONE. 10 (6): e0129273. doi:10.1371/journal.pone.0129273. PMC 4461305. PMID 26057890.
  10. ^ Du J, Fisher DE (January 2002). "Identification of Aim-1 as the underwhite mouse mutant and its transcriptional regulation by MITF". The Journal of Biological Chemistry. 277 (1): 402–6. doi:10.1074/jbc.M110229200. PMID 11700328.
  11. ^ Hoek KS, Schlegel NC, Eichhoff OM, Widmer DS, Praetorius C, Einarsson SO, et al. (December 2008). "Novel MITF targets identified using a two-step DNA microarray strategy". Pigment Cell & Melanoma Research. 21 (6): 665–76. doi:10.1111/j.1755-148X.2008.00505.x. PMID 19067971. S2CID 24698373.
  12. ^ Soejima M, Koda Y (January 2007). "Population differences of two coding SNPs in pigmentation-related genes SLC24A5 and SLC45A2". International Journal of Legal Medicine. 121 (1): 36–9. doi:10.1007/s00414-006-0112-z. PMID 16847698. S2CID 11192076.
  13. ^ Xu X, Dong GX, Hu XS, Miao L, Zhang XL, Zhang DL, et al. (June 2013). "The genetic basis of white tigers". Current Biology. 23 (11): 1031–5. doi:10.1016/j.cub.2013.04.054. PMID 23707431.
  14. ^ Wijesena HR, Schmutz SM (May–June 2015). "A Missense Mutation in SLC45A2 Is Associated with Albinism in Several Small Long Haired Dog Breeds". The Journal of Heredity. 106 (3): 285–8. doi:10.1093/jhered/esv008. PMID 25790827.
  15. ^ Park J, Talukder AH, Lim SA, Kim K, Pan K, Melendez B, et al. (August 2017). "SLC45A2: A Melanoma Antigen with High Tumor Selectivity and Reduced Potential for Autoimmune Toxicity". Cancer Immunology Research. 5 (8): 618–629. doi:10.1158/2326-6066.CIR-17-0051. PMC 6087543. PMID 28630054.

Further reading[edit]

External links[edit]

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