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: Angelman syndrome (AS) is a neuro-genetic disorder characterized by. 1  intellectual and developmental delay. 2  sleep disturbance. 3  seizures. 4  jerky movements (especially hand-flapping).5  frequent laughter or smiling. 6  and usually a happy demeanor.ngelman Syndrome: Angelman syndrome (AS) is a neuro-genetic disorder characterized by. 1  intellectual and developmental delay. 2  sleep disturbance. 3  seizures. 4  jerky movements (especially hand-flapping).