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.
While the loss of UBE3A causes Angelman syndrome, duplications within chromosomal regions that include UBE3A have been associated with autism,,,. Thus, a plausible relationship between a loss and duplication of UBE3A has been proposed to cause Angelman syndrome or certain types of autism, respectively.