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Genetics Home Reference: your guide to understanding genetic conditions     A service of the U.S. National Library of Medicine®


Reviewed November 2006

What is the official name of the MYO1A gene?

The official name of this gene is “myosin IA.”

MYO1A is the gene's official symbol. The MYO1A gene is also known by other names, listed below.

What is the normal function of the MYO1A gene?

The MYO1A gene provides instructions for making a protein called myosin IA, which is part of a group of proteins called unconventional myosins. These proteins, which have similar structures, each play a role in transporting molecules within cells. Myosins interact with actin, a protein that is important for cell movement and shape. Researchers believe that myosins use long filaments of actin as tracks along which to transport other molecules.

Myosin IA is made in intestinal epithelial cells, which are cells that line the walls of the intestine. These cells have fingerlike projections called microvilli that absorb nutrients from food as it passes through the intestine. Based on their appearance, groups of these microvilli are known collectively as the brush border. Microvilli contain bundles of actin filaments that provide structural support and are used for internal transport. Although the precise function of the myosin IA protein is unknown, it is active in the brush border and is probably involved in transporting nutrients from food.

Myosin IA is also present in the inner ear and appears to be involved in normal hearing. Researchers have not determined the protein's role in the inner ear.

Does the MYO1A gene share characteristics with other genes?

The MYO1A gene belongs to a family of genes called myosins (myosins).

A gene family is a group of genes that share important characteristics. Classifying individual genes into families helps researchers describe how genes are related to each other. For more information, see What are gene families? ( in the Handbook.

How are changes in the MYO1A gene related to health conditions?

nonsyndromic deafness - associated with the MYO1A gene

At least eight mutations in the MYO1A gene have been identified in people with a form of nonsyndromic deafness (hearing loss without related signs and symptoms affecting other parts of the body) called DFNA48. Most of these genetic changes alter single protein building blocks (amino acids) in the myosin IA protein. In one case, a mutation adds an extra amino acid to the protein. These mutations probably alter the structure of myosin IA or cause an abnormally small, nonfunctional version of the protein to be made. Researchers have not determined how mutations in the MYO1A gene could result in hearing loss, and it remains unclear whether MYO1A mutations impair hearing.

Where is the MYO1A gene located?

Cytogenetic Location: 12q13-q14

Molecular Location on chromosome 12: base pairs 57,028,517 to 57,050,765

The MYO1A gene is located on the long (q) arm of chromosome 12 between positions 13 and 14.

The MYO1A gene is located on the long (q) arm of chromosome 12 between positions 13 and 14.

More precisely, the MYO1A gene is located from base pair 57,028,517 to base pair 57,050,765 on chromosome 12.

See How do geneticists indicate the location of a gene? ( in the Handbook.

Where can I find additional information about MYO1A?

You and your healthcare professional may find the following resources about MYO1A helpful.

You may also be interested in these resources, which are designed for genetics professionals and researchers.

What other names do people use for the MYO1A gene or gene products?

  • BBMI
  • BBM-I
  • brush border myosin-I
  • DFNA48
  • MIHC
  • MYHL
  • myosin, heavy polypeptide-like (100kD)
  • myosin I heavy chain

See How are genetic conditions and genes named? ( in the Handbook.

What glossary definitions help with understanding MYO1A?

acids ; actin ; amino acid ; autosomal ; autosomal dominant ; brush border ; cell ; epithelial ; gene ; intestine ; microvilli ; mutation ; myosin ; protein

You may find definitions for these and many other terms in the Genetics Home Reference Glossary.


  • Donaudy F, Ferrara A, Esposito L, Hertzano R, Ben-David O, Bell RE, Melchionda S, Zelante L, Avraham KB, Gasparini P. Multiple mutations of MYO1A, a cochlear-expressed gene, in sensorineural hearing loss. Am J Hum Genet. 2003 Jun;72(6):1571-7. Epub 2003 May 6. (
  • Gene Review: Deafness and Hereditary Hearing Loss Overview (
  • NCBI Gene (
  • Tyska MJ, Mackey AT, Huang JD, Copeland NG, Jenkins NA, Mooseker MS. Myosin-1a is critical for normal brush border structure and composition. Mol Biol Cell. 2005 May;16(5):2443-57. Epub 2005 Mar 9. (
  • Tyska MJ, Mooseker MS. A role for myosin-1A in the localization of a brush border disaccharidase. J Cell Biol. 2004 May 10;165(3):395-405. (
  • Tyska MJ, Mooseker MS. MYO1A (brush border myosin I) dynamics in the brush border of LLC-PK1-CL4 cells. Biophys J. 2002 Apr;82(4):1869-83. (


The resources on this site should not be used as a substitute for professional medical care or advice. Users seeking information about a personal genetic disease, syndrome, or condition should consult with a qualified healthcare professional. See How can I find a genetics professional in my area? ( in the Handbook.

Reviewed: November 2006
Published: November 23, 2015