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Reviewed April 2011
What is the official name of the MYH9 gene?
The official name of this gene is “myosin, heavy chain 9, non-muscle.”
MYH9 is the gene's official symbol. The MYH9 gene is also known by other names, listed below.
Read more about gene names and symbols on the About page.
What is the normal function of the MYH9 gene?
The MYH9 gene provides instructions for making a protein called myosin-9. This protein is one part (subunit) of the myosin IIA protein.
There are three forms of myosin II, called myosin IIA, myosin IIB and myosin IIC. They play roles in cell movement (cell motility); maintenance of cell shape; and cytokinesis, which is the step in cell division when the fluid surrounding the nucleus (the cytoplasm) divides to form two separate cells. While some cells use more than one type of myosin II, certain blood cells such as platelets and white blood cells (leukocytes) use only myosin IIA.
Each type of myosin II protein consists of two heavy chains and four light chains. The heavy chains each have two parts: a head region and a tail region. The head region interacts with actin, a protein that is important for cell movement and shape. The long tail region interacts with other proteins, including the tail regions of other myosin proteins.
Does the MYH9 gene share characteristics with other genes?
The MYH9 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 MYH9 gene related to health conditions?
Genetics Home Reference provides information about nonsyndromic hearing loss, which is also associated with changes in the MYH9 gene.
Where is the MYH9 gene located?
Cytogenetic Location: 22q13.1
Molecular Location on chromosome 22: base pairs 36,281,277 to 36,388,067
(Homo sapiens Annotation Release 107, GRCh38.p2) (
The MYH9 gene is located on the long (q) arm of chromosome 22 at position 13.1.
More precisely, the MYH9 gene is located from base pair 36,281,277 to base pair 36,388,067 on chromosome 22.
See How do geneticists indicate the location of a gene? in the Handbook.
Where can I find additional information about MYH9?
You and your healthcare professional may find the following resources about MYH9 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 MYH9 gene or gene products?
See How are genetic conditions and genes named? in the Handbook.
Where can I find general information about genes?
The Handbook provides basic information about genetics in clear language.
These links provide additional genetics resources that may be useful.
What glossary definitions help with understanding MYH9?
acids ; actin ; amino acid ; arginine ; cell ; cell division ; cytokinesis ; cytoplasm ; gene ; kidney ; myosin ; myosin heavy chain ; myosin II ; nucleus ; platelets ; protein ; renal ; renal disease ; subunit ; thrombocytopenia ; white blood cells
You may find definitions for these and many other terms in the Genetics Home Reference Glossary.
See also Understanding Medical Terminology.
References (5 links)
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.