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MUC1 gene

mucin 1, cell surface associated

Normal Function

The MUC1 gene provides instructions for making a protein called mucin 1. This protein is one of several mucin proteins that make up mucus, a slippery substance that lubricates and protects the lining of the airways, digestive system, reproductive system, and other organs and tissues. In addition to its role in mucus, mucin 1 is involved in cell signaling and kidney development.

Although most mucin proteins are released from the cell, mucin 1 spans the cell membrane. It is found in epithelial cells, which are the cells that line the surfaces and cavities of the body. In particular, mucin 1 is found in the respiratory tract, female reproductive organs, and gastrointestinal tract. Like other mucins, mucin 1 has a region called the mucin domain that contains repeated stretches of protein building blocks (amino acids); the number of repeats can vary from 20 to 100. This protein is modified by the addition of numerous chains of sugar molecules, which are attached to certain amino acids in the mucin domain. The sugars spread out from the protein like branches on a tree and prevent access to the cell surface below, protecting the body from foreign invaders. The sugars also attract water molecules, helping lubricate and hydrate the tissues.

The portion of mucin 1 that reaches inside the cell, called the cytoplasmic tail (or MUC1-CT), relays signals from outside the cell to the cell's nucleus; these signals instruct the cell to undergo certain changes. Through this process, mucin 1 is thought to be involved in cell growth and division (proliferation), helping cells stick to one another (cell adhesion), cell movement (motility), and cell survival. The cytoplasmic tail can also detach from the cell membrane and move to the nucleus, although the mechanism is unclear. Some researchers suggest that, in the nucleus, MUC1-CT helps control the activity of other genes. In addition, mucin 1 is present in cells that form the kidneys and is thought to play a role in development of these organs.

Health Conditions Related to Genetic Changes

Medullary cystic kidney disease type 1

Mutations in the MUC1 gene cause medullary cystic kidney disease type 1 (MCKD1). This condition is characterized by impairment of kidney function that usually begins in adulthood and progressively worsens. Some affected individuals develop fluid-filled pockets in the kidneys called medullary cysts.

This condition occurs when a single DNA building block (nucleotide) called cytosine is inserted into the MUC1 gene. These insertions occur in one particular region of the gene, the part that provides instructions for the repeating mucin domain. These mutations lead to the production of an altered mucin 1 protein, although it is unclear how this change causes kidney disease. Why the effects of MUC1 gene mutations are limited to the kidneys is also unknown.

More About This Health Condition

Other Names for This Gene

  • breast carcinoma-associated antigen DF3
  • CA 15-3
  • cancer antigen 15-3
  • carcinoma-associated mucin
  • CD227
  • DF3 antigen
  • EMA
  • episialin
  • H23 antigen
  • H23AG
  • KL-6
  • krebs von den Lungen-6
  • MAM6
  • MCD
  • MCKD
  • MUC-1
  • MUC-1/SEC
  • MUC-1/X
  • MUC1/ZD
  • mucin 1, transmembrane
  • mucin-1
  • peanut-reactive urinary mucin
  • PEM
  • PEMT
  • polymorphic epithelial mucin
  • PUM
  • tumor associated epithelial mucin
  • tumor-associated epithelial membrane antigen
  • tumor-associated mucin

Additional Information & Resources

Tests Listed in the Genetic Testing Registry

Scientific Articles on PubMed

Catalog of Genes and Diseases from OMIM

Gene and Variant Databases


  • Fanni D, Fanos V, Monga G, Gerosa C, Nemolato S, Locci A, Van Eyken P, Iacovidou N, Faa G. MUC1 in mesenchymal-to-epithelial transition during human nephrogenesis: changing the fate of renal progenitor/stem cells? J Matern Fetal Neonatal Med. 2011 Oct;24 Suppl 2:63-6. doi: 10.3109/14767058.2011.613159. Citation on PubMed
  • Fanni D, Iacovidou N, Locci A, Gerosa C, Nemolato S, Van Eyken P, Monga G, Mellou S, Faa G, Fanos V. MUC1 marks collecting tubules, renal vesicles, comma- and S-shaped bodies in human developing kidney tubules, renal vesicles, comma- and s-shaped bodies in human kidney. Eur J Histochem. 2012 Oct 26;56(4):e40. doi: 10.4081/ejh.2012.e40. Citation on PubMed or Free article on PubMed Central
  • Hattrup CL, Gendler SJ. Structure and function of the cell surface (tethered) mucins. Annu Rev Physiol. 2008;70:431-57. doi: 10.1146/annurev.physiol.70.113006.100659. Citation on PubMed
  • Hudson MJ, Stamp GW, Chaudhary KS, Hewitt R, Stubbs AP, Abel PD, Lalani EN. Human MUC1 mucin: a potent glandular morphogen. J Pathol. 2001 Jul;194(3):373-83. doi: 10.1002/1096-9896(200107)194:33.0.CO;2-6. Citation on PubMed
  • Singh PK, Hollingsworth MA. Cell surface-associated mucins in signal transduction. Trends Cell Biol. 2006 Sep;16(9):467-76. doi: 10.1016/j.tcb.2006.07.006. Epub 2006 Aug 9. Citation on PubMed

The information on this site should not be used as a substitute for professional medical care or advice. Contact a health care provider if you have questions about your health.