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The official name of this gene is “phosphate regulating endopeptidase homolog, X-linked.”
PHEX is the gene's official symbol. The PHEX gene is also known by other names, listed below.
The PHEX gene provides instructions for making an enzyme that is active primarily in bones and teeth. Studies suggest that it cuts (cleaves) other proteins into smaller pieces; however, the proteins cleaved by the PHEX enzyme have not been identified.
The PHEX enzyme could be involved in regulating the balance of phosphate in the body. Among its many functions, phosphate plays a critical role in the formation and growth of bones in childhood and helps maintain bone strength in adults. Phosphate levels are controlled in large part by the kidneys. The kidneys normally excrete excess phosphate in urine, and they reabsorb this mineral into the bloodstream when more is needed.
Studies suggest that the PHEX enzyme may be involved in the regulation of a protein called fibroblast growth factor 23 (which is produced from the FGF23 gene). This protein normally inhibits the kidneys' ability to reabsorb phosphate into the bloodstream. Although the PHEX enzyme is thought to have some effect on the activity of fibroblast growth factor 23, no direct link has been established. It remains unclear how the PHEX enzyme helps control phosphate reabsorption and what role it plays in the formation and growth of bones.
More than 200 mutations in the PHEX gene have been found to cause the most common form of hereditary hypophosphatemic rickets, which is known as X-linked hypophosphatemic rickets. These mutations inactivate the PHEX enzyme, leaving it unable to cleave other proteins.
Researchers are uncertain how mutations in the PHEX gene lead to low levels of phosphate in the blood (hypophosphatemia) and related problems with bone growth in people with X-linked hypophosphatemic rickets. Because many affected individuals have increased levels of fibroblast growth factor 23, it is likely that PHEX gene mutations somehow alter the production of that protein. An increase in fibroblast growth factor 23 reduces phosphate reabsorption by the kidneys, leading to hypophosphatemia. However, because some affected individuals have normal levels of fibroblast growth factor 23, researchers are also considering other pathways by which a mutated PHEX gene could result in X-linked hypophosphatemic rickets.
Cytogenetic Location: Xp22.2-p22.1
Molecular Location on the X chromosome: base pairs 22,032,326 to 22,251,309
The PHEX gene is located on the short (p) arm of the X chromosome between positions 22.2 and 22.1.
More precisely, the PHEX gene is located from base pair 22,032,326 to base pair 22,251,309 on the X chromosome.
See How do geneticists indicate the location of a gene? (http://ghr.nlm.nih.gov/handbook/howgeneswork/genelocation) in the Handbook.
You and your healthcare professional may find the following resources about PHEX helpful.
You may also be interested in these resources, which are designed for genetics professionals and researchers.
See How are genetic conditions and genes named? (http://ghr.nlm.nih.gov/handbook/mutationsanddisorders/naming) in the Handbook.
enzyme ; excrete ; fibroblast ; gene ; growth factor ; hereditary ; mineral ; phosphate ; protein ; proximal ; renal ; rickets
You may find definitions for these and many other terms in the Genetics Home Reference Glossary (http://ghr.nlm.nih.gov/glossary).
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? (http://ghr.nlm.nih.gov/handbook/consult/findingprofessional) in the Handbook.