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Reviewed February 2012
What is the official name of the FGA gene?
The official name of this gene is “fibrinogen alpha chain.”
FGA is the gene's official symbol. The FGA 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 FGA gene?
The FGA gene provides instructions for making a protein called the fibrinogen A alpha (Aα) chain, one piece (subunit) of the fibrinogen protein. This protein is important for blood clot formation (coagulation), which is needed to stop excessive bleeding after injury. To form fibrinogen, the Aα chain attaches to two other proteins called the fibrinogen B beta (Bβ) and fibrinogen gamma (γ) chains, each produced from different genes. Two sets of this three-protein complex combine to form functional fibrinogen.
For coagulation to occur, another protein called thrombin removes a piece from the Aα and the Bβ subunits of the functional fibrinogen protein (the pieces are called the A and B fibrinopeptides). This process converts fibrinogen to fibrin, the main protein in blood clots. Fibrin proteins attach to each other, forming a stable network that makes up the blood clot.
How are changes in the FGA gene related to health conditions?
Where is the FGA gene located?
Cytogenetic Location: 4q28
Molecular Location on chromosome 4: base pairs 155,504,279 to 155,511,896
The FGA gene is located on the long (q) arm of chromosome 4 at position 28.
More precisely, the FGA gene is located from base pair 155,504,279 to base pair 155,511,896 on chromosome 4.
See How do geneticists indicate the location of a gene? in the Handbook.
Where can I find additional information about FGA?
You and your healthcare professional may find the following resources about FGA 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 FGA 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 FGA?
You may find definitions for these and many other terms in the Genetics Home Reference Glossary.
See also Understanding Medical Terminology.
References (10 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.