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AliasesPOMT1, LGMD2K, MDDGA1, MDDGB1, MDDGC1, RT, protein O-mannosyltransferase 1
External IDsMGI: 2138994 HomoloGene: 68548 GeneCards: POMT1
RNA expression pattern
PBB GE POMT1 218476 at fs.png
More reference expression data
RefSeq (mRNA)



RefSeq (protein)


Location (UCSC)n/aChr 2: 32.24 – 32.26 Mb
PubMed search[2][3]
View/Edit HumanView/Edit Mouse

Protein O-mannosyl-transferase 1 is an enzyme that in humans is encoded by the POMT1 gene.[4][5] It is a member of the dolichyl-phosphate-mannose-protein mannosyltransferases.


O-mannosylation is an important protein modification in eukaryotes that is initiated by an evolutionarily conserved family of protein O-mannosyltransferases. POMT1 shares sequence similarity with protein O-mannosyltransferases of S. cerevisiae. In yeast, these enzymes are located in the endoplasmic reticulum (ER) and are required for cell integrity and cell wall rigidity. POMT1 also shows similarity to the Drosophila 'rotated abdomen' (rt) gene, which when mutated causes defects in myogenesis and muscle structure.[supplied by OMIM][5]

It is associated with limb-girdle muscular dystrophy type LGMD2K.[6]

In the retina it is known that O-mannosylation of α-DG carried out by POMT1 is crucial for the establishment of proper synapses at the outer plexiform layer and the transmission of visual information from cones and rods to their postsynaptic neurons, i.e. bipolar and horizontal cells.[7]


  1. ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000039254 - Ensembl, May 2017
  2. ^ "Human PubMed Reference:".
  3. ^ "Mouse PubMed Reference:".
  4. ^ Jurado LA, Coloma A, Cruces J (June 1999). "Identification of a human homolog of the Drosophila rotated abdomen gene (POMT1) encoding a putative protein O-mannosyl-transferase, and assignment to human chromosome 9q34.1". Genomics. 58 (2): 171–80. doi:10.1006/geno.1999.5819. PMID 10366449.
  5. ^ a b "Entrez Gene: POMT1 protein-O-mannosyltransferase 1".
  6. ^ Online Mendelian Inheritance in Man (OMIM) 609308
  7. ^ Rubio-Fernández M, Uribe ML, Vicente-Tejedor J, Germain F, Susín-Lara C, Quereda C, Montoliu L, De la Villa P, Martín-Nieto J, Cruces J (2018). "Impairment of photoreceptor ribbon synapses in a novel Pomt1 conditional knockout mouse model of dystroglycanopathy". Scientific Reports 8 (1): 8543. PMID 29867208.

Further reading[edit]

  • Grewal PK, Hewitt JE (October 2003). "Glycosylation defects: a new mechanism for muscular dystrophy?". Human Molecular Genetics. 12 Spec No 2 (90002): R259–64. doi:10.1093/hmg/ddg272. PMID 12925572.
  • Beltrán-Valero de Bernabé D, Currier S, Steinbrecher A, Celli J, van Beusekom E, van der Zwaag B, Kayserili H, Merlini L, Chitayat D, Dobyns WB, Cormand B, Lehesjoki AE, Cruces J, Voit T, Walsh CA, van Bokhoven H, Brunner HG (November 2002). "Mutations in the O-mannosyltransferase gene POMT1 give rise to the severe neuronal migration disorder Walker-Warburg syndrome". American Journal of Human Genetics. 71 (5): 1033–43. doi:10.1086/342975. PMC 419999. PMID 12369018.
  • Sabatelli P, Columbaro M, Mura I, Capanni C, Lattanzi G, Maraldi NM, Beltràn-Valero de Barnabè D, van Bokoven H, Squarzoni S, Merlini L (May 2003). "Extracellular matrix and nuclear abnormalities in skeletal muscle of a patient with Walker-Warburg syndrome caused by POMT1 mutation". Biochimica et Biophysica Acta. 1638 (1): 57–62. doi:10.1016/s0925-4439(03)00040-1. PMID 12757935.
  • Manya H, Chiba A, Yoshida A, Wang X, Chiba Y, Jigami Y, Margolis RU, Endo T (January 2004). "Demonstration of mammalian protein O-mannosyltransferase activity: coexpression of POMT1 and POMT2 required for enzymatic activity". Proceedings of the National Academy of Sciences of the United States of America. 101 (2): 500–5. doi:10.1073/pnas.0307228101. PMC 327176. PMID 14699049.
  • Kim DS, Hayashi YK, Matsumoto H, Ogawa M, Noguchi S, Murakami N, Sakuta R, Mochizuki M, Michele DE, Campbell KP, Nonaka I, Nishino I (March 2004). "POMT1 mutation results in defective glycosylation and loss of laminin-binding activity in alpha-DG". Neurology. 62 (6): 1009–11. doi:10.1212/01.wnl.0000115386.28769.65. PMID 15037715.
  • Akasaka-Manya K, Manya H, Endo T (December 2004). "Mutations of the POMT1 gene found in patients with Walker-Warburg syndrome lead to a defect of protein O-mannosylation". Biochemical and Biophysical Research Communications. 325 (1): 75–9. doi:10.1016/j.bbrc.2004.10.001. PMID 15522202.
  • Currier SC, Lee CK, Chang BS, Bodell AL, Pai GS, Job L, Lagae LG, Al-Gazali LI, Eyaid WM, Enns G, Dobyns WB, Walsh CA (February 2005). "Mutations in POMT1 are found in a minority of patients with Walker-Warburg syndrome". American Journal of Medical Genetics. Part A. 133A (1): 53–7. doi:10.1002/ajmg.a.30487. PMID 15637732.
  • Balci B, Uyanik G, Dincer P, Gross C, Willer T, Talim B, Haliloglu G, Kale G, Hehr U, Winkler J, Topaloğlu H (April 2005). "An autosomal recessive limb girdle muscular dystrophy (LGMD2) with mild mental retardation is allelic to Walker-Warburg syndrome (WWS) caused by a mutation in the POMT1 gene". Neuromuscular Disorders. 15 (4): 271–5. doi:10.1016/j.nmd.2005.01.013. PMID 15792865.
  • Otsuki T, Ota T, Nishikawa T, Hayashi K, Suzuki Y, Yamamoto J, Wakamatsu A, Kimura K, Sakamoto K, Hatano N, Kawai Y, Ishii S, Saito K, Kojima S, Sugiyama T, Ono T, Okano K, Yoshikawa Y, Aotsuka S, Sasaki N, Hattori A, Okumura K, Nagai K, Sugano S, Isogai T (2007). "Signal sequence and keyword trap in silico for selection of full-length human cDNAs encoding secretion or membrane proteins from oligo-capped cDNA libraries". DNA Research. 12 (2): 117–26. doi:10.1093/dnares/12.2.117. PMID 16303743.
  • Kimura K, Wakamatsu A, Suzuki Y, Ota T, Nishikawa T, Yamashita R, Yamamoto J, Sekine M, Tsuritani K, Wakaguri H, Ishii S, Sugiyama T, Saito K, Isono Y, Irie R, Kushida N, Yoneyama T, Otsuka R, Kanda K, Yokoi T, Kondo H, Wagatsuma M, Murakawa K, Ishida S, Ishibashi T, Takahashi-Fujii A, Tanase T, Nagai K, Kikuchi H, Nakai K, Isogai T, Sugano S (January 2006). "Diversification of transcriptional modulation: large-scale identification and characterization of putative alternative promoters of human genes". Genome Research. 16 (1): 55–65. doi:10.1101/gr.4039406. PMC 1356129. PMID 16344560.
  • Akasaka-Manya K, Manya H, Nakajima A, Kawakita M, Endo T (July 2006). "Physical and functional association of human protein O-mannosyltransferases 1 and 2". The Journal of Biological Chemistry. 281 (28): 19339–45. doi:10.1074/jbc.M601091200. PMID 16698797.
  • Bouchet C, Vuillaumier-Barrot S, Gonzales M, Boukari S, Bizec CL, Fallet C, Delezoide AL, Moirot H, Laquerriere A, Encha-Razavi F, Durand G, Seta N (January 2007). "Detection of an Alu insertion in the POMT1 gene from three French Walker Warburg syndrome families". Molecular Genetics and Metabolism. 90 (1): 93–6. doi:10.1016/j.ymgme.2006.09.005. PMID 17079174.

External links[edit]