A regular expression is a pattern that the regular expression engine attempts to match in input text. A pattern consists of one or more character literals, operators, or constructs. For a brief introduction, see .NET Framework Regular Expressions.
(For our list of subjects with an imprinting defect, click here.). UBE3A Mutation. Malfunction of the UBE3A gene on the maternal chromosome #15 seems to be the cause of Angelman syndrome. In the case of a UBE3A mutation, there is a mistake in the genetic code of the UBE3A gene.
Angelman Syndrome is a genetic disorder in which a gene on chromosome 15 is missing or unexpressed. Children with Angelman Syndrome typically have developmental delays that are frequently evident between 6-12 months of age. Diagnosis can be established through genetic and DNA testing as early as the first year of life.