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Reviewed September 2014
What is the official name of the LAMA3 gene?
The official name of this gene is “laminin, alpha 3.”
LAMA3 is the gene's official symbol. The LAMA3 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 LAMA3 gene?
The LAMA3 gene provides instructions for making one part (subunit) of a protein called laminin 332 (formerly known as laminin 5). This protein is made up of three subunits, called alpha, beta, and gamma. The LAMA3 gene carries instructions for the alpha subunit; the beta and gamma subunits are produced from other genes. Three versions of the alpha subunit, called alpha-3a, alpha-3b1, and alpha-3b2, are produced from the LAMA3 gene.
Laminins are a group of proteins that regulate cell growth, cell movement (motility), and the attachment of cells to one another (adhesion). They are also involved in the formation and organization of basement membranes, which are thin, sheet-like structures that separate and support cells in many tissues. Laminin 332 has a particularly important role in the basement membrane that underlies the top layer of skin (the epidermis). This membrane gives strength and resiliency to the skin and creates an additional barrier between the body and its surrounding environment. Laminin 332 is a major component of fibers called anchoring filaments, which connect the two layers of the basement membrane and help hold the skin together.
Studies suggest that laminin 332 also has several other functions. This protein appears to be important in the formation of early wound-healing tissues. Additionally, researchers have proposed roles for laminin 332 in the clear outer covering of the eye (the cornea) and in the development of tooth enamel.
The alpha subunit produced from the LAMA3 gene is also part of two other laminin proteins, laminin 311 and laminin 321. These laminins also appear to provide strength to the skin, although they do not play as big a role as laminin 332. In addition, laminin 311 is involved in cell signaling in the lungs and other tissues.
Does the LAMA3 gene share characteristics with other genes?
The LAMA3 gene belongs to a family of genes called LAM (laminins).
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 LAMA3 gene related to health conditions?
Where is the LAMA3 gene located?
Cytogenetic Location: 18q11.2
Molecular Location on chromosome 18: base pairs 23,689,442 to 23,955,065
The LAMA3 gene is located on the long (q) arm of chromosome 18 at position 11.2.
More precisely, the LAMA3 gene is located from base pair 23,689,442 to base pair 23,955,065 on chromosome 18.
See How do geneticists indicate the location of a gene? in the Handbook.
Where can I find additional information about LAMA3?
You and your healthcare professional may find the following resources about LAMA3 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 LAMA3 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 LAMA3?
acids ; basal lamina ; basement membrane ; basement membranes ; cell ; chronic ; cornea ; cutaneous ; enamel ; epidermis ; gene ; hemidesmosome ; keratinocyte ; protein ; subunit ; syndrome ; tissue ; trauma ; ulceration
You may find definitions for these and many other terms in the Genetics Home Reference Glossary.
See also Understanding Medical Terminology.
References (11 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.