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.
ADVERTISEMENT. 1  Angelman syndrome (AS) is a developmental disorder affecting the brain. 2  AS has been shown in most cases to have a genetic cause. 3  About 1 in 10 people with AS may have symptoms of AS but do not have a clear genetic cause. 4  AS occurs in approximately 1 out of 15,000 live births. 5  AS is generally found when a baby is between 6 and 12 ...