|A service of the U.S. National Library of Medicine®|
On this page:
Reviewed August 2015
What is the official name of the GALT gene?
The official name of this gene is “galactose-1-phosphate uridylyltransferase.”
GALT is the gene's official symbol. The GALT 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 GALT gene?
The GALT gene provides instructions for making an enzyme called galactose-1-phosphate uridylyltransferase. This enzyme enables the body to process a simple sugar called galactose, which is present in small amounts in many foods. Galactose is primarily part of a larger sugar called lactose, which is found in all dairy products and many baby formulas.
Galactose-1-phosphate uridylyltransferase is responsible for one step in a chemical process that breaks down galactose into other molecules that can be used by the body. Specifically, this enzyme converts a modified form of galactose (galactose-1-phosphate) to glucose, which is another simple sugar. Glucose is the main energy source for most cells. This chemical reaction also produces another form of galactose (UDP-galactose) that is used to build galactose-containing proteins and fats. These modified proteins and fats play critical roles in chemical signaling, building cellular structures, transporting molecules, and producing energy.
How are changes in the GALT gene related to health conditions?
Where is the GALT gene located?
Cytogenetic Location: 9p13
Molecular Location on chromosome 9: base pairs 34,646,589 to 34,650,598
(Homo sapiens Annotation Release 107, GRCh38.p2) (
The GALT gene is located on the short (p) arm of chromosome 9 at position 13.
More precisely, the GALT gene is located from base pair 34,646,589 to base pair 34,650,598 on chromosome 9.
See How do geneticists indicate the location of a gene? in the Handbook.
Where can I find additional information about GALT?
You and your healthcare professional may find the following resources about GALT 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 GALT 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 GALT?
You may find definitions for these and many other terms in the Genetics Home Reference Glossary.
See also Understanding Medical Terminology.
References (8 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.