Angelman Syndrome

Version	Summary	Created by	Modification	Content Size	Created at	Operation
1		Catherine Yang	+ 687 word(s)	687	2020-12-15 07:15:52

This entry is adapted from the peer-reviewed paper https://medlineplus.gov/genetics/condition/angelman-syndrome

Angelman syndrome is a complex genetic disorder that primarily affects the nervous system. Characteristic features of this condition include delayed development, intellectual disability, severe speech impairment, and problems with movement and balance (ataxia). Most affected children also have recurrent seizures (epilepsy) and a small head size (microcephaly). Delayed development becomes noticeable by the age of 6 to 12 months, and other common signs and symptoms usually appear in early childhood.

genetic conditions

1. Introduction

Children with Angelman syndrome typically have a happy, excitable demeanor with frequent smiling, laughter, and hand-flapping movements. Hyperactivity, a short attention span, and a fascination with water are common. Most affected children also have difficulty sleeping and need less sleep than usual.

With age, people with Angelman syndrome become less excitable, and the sleeping problems tend to improve. However, affected individuals continue to have intellectual disability, severe speech impairment, and seizures throughout their lives. Adults with Angelman syndrome have distinctive facial features that may be described as "coarse." Other common features include unusually fair skin with light-colored hair and an abnormal side-to-side curvature of the spine (scoliosis). The life expectancy of people with this condition appears to be nearly normal.

2. Frequency

Angelman syndrome affects an estimated 1 in 12,000 to 20,000 people.

3. Causes

Many of the characteristic features of Angelman syndrome result from the loss of function of a gene called UBE3A. People normally inherit one copy of the UBE3A gene from each parent. Both copies of this gene are turned on (active) in many of the body's tissues. In certain areas of the brain, however, only the copy inherited from a person's mother (the maternal copy) is active. This parent-specific gene activation is caused by a phenomenon called genomic imprinting. If the maternal copy of the UBE3A gene is lost because of a chromosomal change or a gene mutation, a person will have no active copies of the gene in some parts of the brain.

Several different genetic mechanisms can inactivate or delete the maternal copy of the UBE3A gene. Most cases of Angelman syndrome (about 70 percent) occur when a segment of the maternal chromosome 15 containing this gene is deleted. In other cases (about 11 percent), Angelman syndrome is caused by a mutation in the maternal copy of the UBE3A gene.

In a small percentage of cases, Angelman syndrome results when a person inherits two copies of chromosome 15 from his or her father (paternal copies) instead of one copy from each parent. This phenomenon is called paternal uniparental disomy. Rarely, Angelman syndrome can also be caused by a chromosomal rearrangement called a translocation, or by a mutation or other defect in the region of DNA that controls activation of the UBE3A gene. These genetic changes can abnormally turn off (inactivate) UBE3A or other genes on the maternal copy of chromosome 15.

The causes of Angelman syndrome are unknown in 10 to 15 percent of affected individuals. Changes involving other genes or chromosomes may be responsible for the disorder in these cases.

In some people who have Angelman syndrome, the loss of a gene called OCA2 is associated with light-colored hair and fair skin. The OCA2 gene is located on the segment of chromosome 15 that is often deleted in people with this disorder. However, loss of the OCA2 gene does not cause the other signs and symptoms of Angelman syndrome. The protein produced from this gene helps determine the coloring (pigmentation) of the skin, hair, and eyes.

4. Inheritance

Most cases of Angelman syndrome are not inherited, particularly those caused by a deletion in the maternal chromosome 15 or by paternal uniparental disomy. These genetic changes occur as random events during the formation of reproductive cells (eggs and sperm) or in early embryonic development. Affected people typically have no history of the disorder in their family.

Rarely, a genetic change responsible for Angelman syndrome can be inherited. For example, it is possible for a mutation in the UBE3A gene or in the nearby region of DNA that controls gene activation to be passed from one generation to the next.

5. Other Names for This Condition

References

Buiting K. Prader-Willi syndrome and Angelman syndrome. Am J Med Genet C SeminMed Genet. 2010 Aug 15;154C(3):365-76. doi: 10.1002/ajmg.c.30273. Review.
Dagli AI, Mueller J, Williams CA. Angelman Syndrome. 1998 Sep 15 [updated 2017Dec 21]. In: Adam MP, Ardinger HH, Pagon RA, Wallace SE, Bean LJH, Stephens K,Amemiya A, editors. GeneReviews® [Internet]. Seattle (WA): University ofWashington, Seattle; 1993-2020. Available fromhttp://www.ncbi.nlm.nih.gov/books/NBK1144/
Gentile JK, Tan WH, Horowitz LT, Bacino CA, Skinner SA, Barbieri-Welge R,Bauer-Carlin A, Beaudet AL, Bichell TJ, Lee HS, Sahoo T, Waisbren SE, Bird LM,Peters SU. A neurodevelopmental survey of Angelman syndrome withgenotype-phenotype correlations. J Dev Behav Pediatr. 2010 Sep;31(7):592-601.doi: 10.1097/DBP.0b013e3181ee408e. Erratum in: J Dev Behav Pediatr. 2011Apr;32(3):267.
Lalande M, Calciano MA. Molecular epigenetics of Angelman syndrome. Cell MolLife Sci. 2007 Apr;64(7-8):947-60. Review.
Lossie AC, Whitney MM, Amidon D, Dong HJ, Chen P, Theriaque D, Hutson A,Nicholls RD, Zori RT, Williams CA, Driscoll DJ. Distinct phenotypes distinguishthe molecular classes of Angelman syndrome. J Med Genet. 2001 Dec;38(12):834-45.
Pelc K, Cheron G, Dan B. Behavior and neuropsychiatric manifestations inAngelman syndrome. Neuropsychiatr Dis Treat. 2008 Jun;4(3):577-84.
Tan WH, Bacino CA, Skinner SA, Anselm I, Barbieri-Welge R, Bauer-Carlin A,Beaudet AL, Bichell TJ, Gentile JK, Glaze DG, Horowitz LT, Kothare SV, Lee HS,Nespeca MP, Peters SU, Sahoo T, Sarco D, Waisbren SE, Bird LM. Angelman syndrome:Mutations influence features in early childhood. Am J Med Genet A. 2011Jan;155A(1):81-90. doi: 10.1002/ajmg.a.33775.
Van Buggenhout G, Fryns JP. Angelman syndrome (AS, MIM 105830). Eur J HumGenet. 2009 Nov;17(11):1367-73. doi: 10.1038/ejhg.2009.67.Review.
Williams CA, Beaudet AL, Clayton-Smith J, Knoll JH, Kyllerman M, Laan LA,Magenis RE, Moncla A, Schinzel AA, Summers JA, Wagstaff J. Angelman syndrome2005: updated consensus for diagnostic criteria. Am J Med Genet A. 2006 Mar1;140(5):413-8.
Williams CA. Neurological aspects of the Angelman syndrome. Brain Dev. 2005Mar;27(2):88-94. Review.
Williams CA. The behavioral phenotype of the Angelman syndrome. Am J Med GenetC Semin Med Genet. 2010 Nov 15;154C(4):432-7. doi: 10.1002/ajmg.c.30278. Review.

©Text is available under the terms and conditions of the Creative Commons-Attribution ShareAlike (CC BY-SA) license; additional terms may apply. By using this site, you agree to the Terms and Conditions and Privacy Policy.

Upload a video for this entry

Information

Subjects: Genetics & Heredity

Contributor MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :

Catherine Yang

View Times: 438

Entry Collection: MedlinePlus

Update Date: 24 Dec 2020

Table of Contents

Video Upload Options

Confirm

1. Introduction

2. Frequency

3. Causes

4. Inheritance

5. Other Names for This Condition

References

Video Upload Options

Confirm

1. Introduction

2. Frequency

3. Causes

3.1. The genes and chromosome associated with Angelman syndrome

4. Inheritance

5. Other Names for This Condition

References