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    XPA Gene

    Subjects: Genetics
    View times: 4
    Submitted by: Peter Tang
    (This entry belongs to Entry Collection "MedlinePlus ")

    Definition

    XPA, DNA damage recognition and repair factor: The XPA gene provides instructions for making a protein that is involved in repairing damaged DNA. DNA can be damaged by ultraviolet (UV) rays from the sun and by toxic chemicals, radiation, and unstable molecules called free radicals.

    1. Normal Function

    DNA damage occurs frequently, but normal cells are usually able to fix it before it can cause problems. One of the major mechanisms that cells use to fix DNA is known as nucleotide excision repair (NER). As part of this repair mechanism, the XPA protein helps verify DNA damage and stabilize the DNA as it is repaired. The XPA protein attaches (binds) to areas of damaged DNA, where it interacts with many other proteins as part of a large complex. Proteins in this complex unwind the section of DNA where the damage has occurred, snip out (excise) the abnormal section, and replace the damaged area with the correct DNA.

    2. Health Conditions Related to Genetic Changes

    2.1. Xeroderma pigmentosum

    At least 25 mutations in the XPA gene have been found to cause xeroderma pigmentosum. Mutations in this gene are responsible for a very severe form of the disorder that is more common in the Japanese population than in other populations. Most Japanese people with xeroderma pigmentosum have the same XPA gene mutation, which is written as IVS3AS, G>C. This mutation prevents cells from producing any functional XPA protein. Other XPA gene mutations, which have been reported in Japan and elsewhere, result in the production of a defective version of the XPA protein or greatly reduce the amount of this protein that is made in cells.

    A partial or total loss of the XPA protein prevents cells from repairing DNA damage normally. As a result, abnormalities accumulate in DNA, causing cells to malfunction and eventually to become cancerous or die. These problems with DNA repair cause people with xeroderma pigmentosum to be extremely sensitive to UV rays from sunlight. When UV rays damage genes that control cell growth and division, cells can grow too fast and in an uncontrolled way. As a result, people with xeroderma pigmentosum have a greatly increased risk of developing cancer. These cancers occur most frequently in areas of the body that are exposed to the sun, such as the skin and eyes.

    When xeroderma pigmentosum is caused by XPA gene mutations, it is often associated with progressive neurological abnormalities. These nervous system problems include hearing loss, poor coordination, difficulty walking, movement problems, loss of intellectual function, difficulty swallowing and talking, and seizures. The neurological abnormalities are thought to result from a buildup of DNA damage, although the brain is not exposed to UV rays. Researchers suspect that other factors damage DNA in nerve cells. It is unclear why some people with xeroderma pigmentosum develop neurological abnormalities and others do not.

    3. Other Names for This Gene

    • xeroderma pigmentosum, complementation group A

    • XP1

    • XPA_HUMAN

    • XPAC

    The entry is from https://medlineplus.gov/genetics/gene/xpa

    References

    1. Camenisch U, Nägeli H. XPA gene, its product and biological roles. Adv Exp MedBiol. 2008;637:28-38. Review.
    2. Cleaver JE, States JC. The DNA damage-recognition problem in human and othereukaryotic cells: the XPA damage binding protein. Biochem J. 1997 Nov 15;328 ( Pt1):1-12. Review.
    3. Cleaver JE, Thompson LH, Richardson AS, States JC. A summary of mutations inthe UV-sensitive disorders: xeroderma pigmentosum, Cockayne syndrome, andtrichothiodystrophy. Hum Mutat. 1999;14(1):9-22. Review.
    4. Hirai Y, Kodama Y, Moriwaki S, Noda A, Cullings HM, Macphee DG, Kodama K,Mabuchi K, Kraemer KH, Land CE, Nakamura N. Heterozygous individuals bearing afounder mutation in the XPA DNA repair gene comprise nearly 1% of the Japanesepopulation. Mutat Res. 2006 Oct 10;601(1-2):171-8.
    5. Jones CJ, Wood RD. Preferential binding of the xeroderma pigmentosum group Acomplementing protein to damaged DNA. Biochemistry. 1993 Nov 16;32(45):12096-104.
    6. Satokata I, Iwai K, Matsuda T, Okada Y, Tanaka K. Genomic characterization of the human DNA excision repair-controlling gene XPAC. Gene. 1993 Dec22;136(1-2):345-8.
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