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UBE3A is a human gene that provides instructions for making the enzyme ubiquitin protein ligase E3A. This enzyme is involved in targeting other proteins to be broken down (degraded) within cells. For example, the p53 protein, which controls cell growth and division, is one of the targets of ubiquitin protein ligase E3A. Protein degradation is a normal process that removes damaged or unnecessary proteins and helps maintain the normal functions of cells.
Additional recommended knowledge
Both copies of the UBE3A gene are active in most of the body's tissues. In the brain, however, only the copy inherited from a person's mother (the maternal copy) is normally active.
The UBE3A gene is located on the long (q) arm of chromosome 15 between positions 11 and 13, from base pair 23,133,488 to base pair 23,235,220.
Mutations within the UBE3A gene are responsible for some cases of Angelman syndrome. Most of these mutations result in an abnormally short, nonfunctional version of ubiquitin protein ligase E3A. Because the copy of the gene inherited from a person's father (the paternal copy) is normally inactive in the brain, a mutation in the remaining maternal copy prevents any of the enzyme from being produced in the brain. This loss of enzyme function likely causes the characteristic features of Angelman syndrome.
Abnormalities involving the region of chromosome 15 that contains the UBE3A gene also cause Angelman syndrome. These chromosomal changes include deletions, rearrangements (translocations) of genetic material, and other abnormalities. Like mutations within the gene, these chromosomal changes prevent any functional ubiquitin protein ligase E3A from being produced in the brain.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "UBE3A". A list of authors is available in Wikipedia.|