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 (AS) is seen in one in 12,000â20,000 of the population and is characterized by severe developmental delay and speech impairment, gait ataxia and/or tremulousness of the limbs, and a unique behavior with a happy demeanor that includes frequent laughing, smiling, and excitability.