MLANA

MLANA
Available structures PDB Ortholog search: PDBe RCSB List of PDB id codes 2GT9, 2GTW, 2GTZ, 2GUO, 3HG1, 3L6F, 3MRO, 3MRP, 3MRQ, 3QDM, 3QEQ, 3QFD, 4EUP, 4JFF, 4L3E, 4QOK, 4WJ5, 5E9D
Identifiers
Aliases	MLANA, MART-1, MART1, melan-A
External IDs	OMIM: 605513; MGI: 108454; HomoloGene: 4026; GeneCards: MLANA; OMA:MLANA - orthologs
Gene location (Human) Chr. Chromosome 9 (human)[1] Band 9p24.1 Start 5,890,889 bp[1] End 5,910,606 bp[1]
Gene location (Mouse) Chr. Chromosome 19 (mouse)[2] Band 19 C1|19 24.28 cM Start 29,675,224 bp[2] End 29,686,034 bp[2]
RNA expression pattern Bgee Human Mouse (ortholog) Top expressed in skin of thigh retinal pigment epithelium skin of abdomen testicle skin of arm gonad vulva skin of hip human penis monocyte Top expressed in iris ciliary body hair follicle stria vascularis skin of abdomen retinal pigment epithelium embryo epithelium of lens embryo skin of back More reference expression data BioGPS More reference expression data
Orthologs Species Human Mouse Entrez 2315 77836 Ensembl ENSG00000120215 ENSMUSG00000024806 UniProt Q16655 Q2TA50 RefSeq (mRNA) NM_005511 NM_029993 RefSeq (protein) NP_005502 NP_084269 Location (UCSC) Chr 9: 5.89 – 5.91 Mb Chr 19: 29.68 – 29.69 Mb PubMed search [3] [4]
Wikidata
View/Edit Human View/Edit Mouse

Immunohistochemistry stain for Melan-A in a poorly differentiated metastatic melanoma to a lymph node, helping in its diagnosis

Protein melan-A also known as melanoma antigen recognized by T cells 1 or MART-1 is a protein that in humans is encoded by the MLANA or "MALENA" gene.^[5] A fragment of the protein, usually consisting of the nine amino acids 27 to 35, is bound by MHC class I complexes which present it to T cells of the immune system. These complexes can be found on the surface of melanoma cells. Decameric peptides (26-35) are being investigated as cancer vaccines.

Discovery and nomenclature

The names MART-1 and melan-A were coined by two groups of researchers who independently sequenced the gene for this antigen in 1994. Both names are currently in common use. Kawakami et al. at the National Cancer Institute coined the term MART-1, which stands for "melanoma antigen recognized by T-cells".^[6] Coulie et al. of Belgium called the gene melan-A, presumably an abbreviation for "melanocyte antigen".^[7]

Clinical significance

MART-1/melan-A is a protein antigen that is found on the surface of melanocytes. Antibodies against the antigen are used in the medical specialty of anatomic pathology in order to recognize cells of melanocytic differentiation, useful for the diagnosis of a melanoma. The same name is also used to refer to the gene which codes for the antigen.

The MART-1/melan-A antigen is specific for the melanocyte lineage, found in normal skin, the retina, and melanocytes, but not in other normal tissues. It is thus useful as a marker for melanocytic tumors (melanomas) with the caveat that it is normally found in benign nevi as well.

In many immunological studies melan-A peptides serve as a positive control for T-cell priming experiments. This is due to the fact that its high precursor frequency of about 1/1000 among cytotoxic T-cells makes it easy for antigen presenting cells to evoke peptide-specific responses.^[8]

Structure

MART-1/melan-A is a putative 13 kDa transmembrane protein consisting of 118 amino acids. It has a single transmembrane domain.

Regulation

Its expression is regulated by the microphthalmia-associated transcription factor.^[9][10]

References

1. GRCh38: Ensembl release 89: ENSG00000120215 – Ensembl, May 2017
2. GRCm38: Ensembl release 89: ENSMUSG00000024806 – 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. "Entrez Gene: MLANA melan-A".
6. Kawakami Y, Eliyahu S, Delgado CH, Robbins PF, Rivoltini L, Topalian SL, Miki T, Rosenberg SA (April 1994). "Cloning of the gene coding for a shared human melanoma antigen recognized by autologous T cells infiltrating into tumor". Proc. Natl. Acad. Sci. U.S.A. 91 (9): 3515–9. Bibcode:1994PNAS...91.3515K. doi:10.1073/pnas.91.9.3515. PMC 43610. PMID 8170938.
7. Coulie PG, Brichard V, Van Pel A, Wölfel T, Schneider J, Traversari C, Mattei S, De Plaen E, Lurquin C, Szikora JP, Renauld JC, Boon T (July 1994). "A new gene coding for a differentiation antigen recognized by autologous cytolytic T lymphocytes on HLA-A2 melanomas". J. Exp. Med. 180 (1): 35–42. doi:10.1084/jem.180.1.35. PMC 2191574. PMID 8006593.
8. Zippelius A, Pittet MJ, Batard P, et al. (2002). "Thymic selection generates a large T cell pool recognizing a self-peptide in humans". J. Exp. Med. 195 (4): 485–94. doi:10.1084/jem.20011658. PMC 2193620. PMID 11854361.
9. Du J, Miller AJ, Widlund HR, Horstmann MA, Ramaswamy S, Fisher DE (2003). "MLANA/MART1 and SILV/PMEL17/GP100 are transcriptionally regulated by MITF in melanocytes and melanoma". Am. J. Pathol. 163 (1): 333–43. doi:10.1016/S0002-9440(10)63657-7. PMC 1868174. PMID 12819038.
10. Hoek KS, Schlegel NC, Eichhoff OM, et al. (2008). "Novel MITF targets identified using a two-step DNA microarray strategy". Pigment Cell Melanoma Res. 21 (6): 665–76. doi:10.1111/j.1755-148X.2008.00505.x. PMID 19067971. S2CID 24698373.

Further reading

• Moritake H, Sugimoto T, Asada Y, et al. (2002). "Newly established clear cell sarcoma (malignant melanoma of soft parts) cell line expressing melanoma-associated Melan-A antigen and overexpressing C-MYC oncogene". Cancer Genet. Cytogenet. 135 (1): 48–56. doi:10.1016/S0165-4608(01)00641-0. PMID 12072203.
• Dutoit V, Rubio-Godoy V, Pittet MJ, et al. (2002). "Degeneracy of antigen recognition as the molecular basis for the high frequency of naive A2/Melan-a peptide multimer(+) CD8(+) T cells in humans". J. Exp. Med. 196 (2): 207–16. doi:10.1084/jem.20020242. PMC 2193921. PMID 12119345.
• Mantovani S, Palermo B, Garbelli S, et al. (2002). "Dominant TCR-alpha requirements for a self antigen recognition in humans". J. Immunol. 169 (11): 6253–60. doi:10.4049/jimmunol.169.11.6253. PMID 12444131. S2CID 6143069.
• 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. Bibcode:2002PNAS...9916899M. doi:10.1073/pnas.242603899. PMC 139241. PMID 12477932.
• Du J, Miller AJ, Widlund HR, et al. (2003). "MLANA/MART1 and SILV/PMEL17/GP100 are transcriptionally regulated by MITF in melanocytes and melanoma". Am. J. Pathol. 163 (1): 333–43. doi:10.1016/S0002-9440(10)63657-7. PMC 1868174. PMID 12819038.
• Mandelcorn-Monson RL, Shear NH, Yau E, et al. (2003). "Cytotoxic T lymphocyte reactivity to gp100, MelanA/MART-1, and tyrosinase, in HLA-A2-positive vitiligo patients". J. Invest. Dermatol. 121 (3): 550–6. doi:10.1046/j.1523-1747.2003.12413.x. PMID 12925214.
• Ghorab Z, Jorda M, Ganjei P, Nadji M (2004). "Melan A (A103) is expressed in adrenocortical neoplasms but not in renal cell and hepatocellular carcinomas". Appl. Immunohistochem. Mol. Morphol. 11 (4): 330–3. doi:10.1097/00129039-200312000-00009. PMID 14663359. S2CID 37758396.
• Murer K, Urosevic M, Willers J, et al. (2005). "Expression of Melan-A/MART-1 in primary melanoma cell cultures has prognostic implication in metastatic melanoma patients". Melanoma Res. 14 (4): 257–62. doi:10.1097/01.cmr.0000136713.21029.56. PMID 15305155. S2CID 19261422.
• 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. PMC 528928. PMID 15489334.
• Kucher C, Zhang PJ, Pasha T, et al. (2005). "Expression of Melan-A and Ki-67 in desmoplastic melanoma and desmoplastic nevi". The American Journal of Dermatopathology. 26 (6): 452–7. doi:10.1097/00000372-200412000-00002. PMID 15618925. S2CID 22909579.
• Hoashi T, Watabe H, Muller J, et al. (2005). "MART-1 is required for the function of the melanosomal matrix protein PMEL17/GP100 and the maturation of melanosomes". J. Biol. Chem. 280 (14): 14006–16. doi:10.1074/jbc.M413692200. PMID 15695812. S2CID 31894507.
• Godefroy E, Scotto L, Souleimanian NE, et al. (2006). "Identification of two Melan-A CD4+ T cell epitopes presented by frequently expressed MHC class II alleles". Clin. Immunol. 121 (1): 54–62. doi:10.1016/j.clim.2006.05.007. PMID 16814609.
• Kono M, Dunn IS, Durda PJ, et al. (2007). "Role of the mitogen-activated protein kinase signaling pathway in the regulation of human melanocytic antigen expression". Mol. Cancer Res. 4 (10): 779–92. doi:10.1158/1541-7786.MCR-06-0077. PMID 17050671. S2CID 7499391.
• Bioley G, Jandus C, Tuyaerts S, et al. (2007). "Melan-A/MART-1-specific CD4 T cells in melanoma patients: identification of new epitopes and ex vivo visualization of specific T cells by MHC class II tetramers". J. Immunol. 177 (10): 6769–79. doi:10.4049/jimmunol.177.10.6769. PMID 17082590. S2CID 27014057.
• Roma AA, Magi-Galluzzi C, Zhou M (2007). "Differential expression of melanocytic markers in myoid, lipomatous, and vascular components of renal angiomyolipomas". Arch. Pathol. Lab. Med. 131 (1): 122–5. doi:10.5858/2007-131-122-DEOMMI. PMID 17227112.
• Yuan F, Georgiou T, Hillon T, et al. (2007). "Crystallization and preliminary X-ray structural studies of a Melan-A pMHC-TCR complex". Acta Crystallographica Section F. 63 (Pt 9): 758–60. doi:10.1107/S1744309107037244. PMC 2376329. PMID 17768347.