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Reviewed October 2010
What is the official name of the RPGR gene?
The official name of this gene is “retinitis pigmentosa GTPase regulator.”
RPGR is the gene's official symbol. The RPGR 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 RPGR gene?
The RPGR gene provides instructions for making a protein that is essential for normal vision. Although the protein's function is not well understood, studies suggest that it plays an important role in cell structures called cilia. Cilia are microscopic, finger-like projections that stick out from the surface of many types of cells. They are involved in cell movement and many different chemical signaling pathways. Cilia are also necessary for the perception of sensory input, including hearing, smell, and vision.
Several different versions (isoforms) of the RPGR protein are produced from the RPGR gene. One version contains a segment known as the ORF15 exon. This version of the RPGR protein is active (expressed) predominantly in the retina, which is the light-sensitive tissue at the back of the eye. Specifically, the ORF15-containing isoform is found in the retina's specialized light receptor cells (photoreceptors). Researchers suspect that this isoform may help maintain photoreceptors by regulating the function of cilia. Other isoforms of the RPGR protein are expressed in other parts of the body, where they are probably also involved in cilia function.
How are changes in the RPGR gene related to health conditions?
Genetics Home Reference provides information about primary ciliary dyskinesia, which is also associated with changes in the RPGR gene.
Where is the RPGR gene located?
Cytogenetic Location: Xp21.1
Molecular Location on the X chromosome: base pairs 38,269,170 to 38,327,564
(Homo sapiens Annotation Release 107, GRCh38.p2) (
The RPGR gene is located on the short (p) arm of the X chromosome at position 21.1.
More precisely, the RPGR gene is located from base pair 38,269,170 to base pair 38,327,564 on the X chromosome.
See How do geneticists indicate the location of a gene? in the Handbook.
Where can I find additional information about RPGR?
You and your healthcare professional may find the following resources about RPGR 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 RPGR 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 RPGR?
You may find definitions for these and many other terms in the Genetics Home Reference Glossary.
See also Understanding Medical Terminology.
References (13 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.