Autism-World

In the child in whom the diagnosis is suspected, a high resolution chromosome analysis is often first performed to insure that no other chromosome disorder is present, since features such as mental delay, microcephaly, or seizures can be seen in other chromosome abnormalities. Concurrent with the chromosome test, a fluorescent in situ hybridization (FISH) analysis [...]

Large typical deletion
70%
Hypopigmentation is common

UBE3A mutation
5-7%
Possibility of normal carrier mother

Paternal uniparental disomy
2-3%
Inheritance of both 15s from father

Imprinting defect
3-5%
Some have IC deletion, some do not

Other chromosome abnormalities
2%
Unusual chromosome rearrangements

Unknown
15%
All diagnostic tests negative (FISH, methylation, UBE3A mutation analysis)

Technorati : Angelman Syndrome

For several decades the chromosome study of AS individuals revealed no abnormalities, but with the development of improved methods a very small deleted area was found in chromosome 15. Molecular methods such as FISH (fluorescence in situ hybridization) now demonstrate a deletion in about 70% of individuals with AS. The deleted area, although extremely small, [...]

In 1965, Dr. Harry Angelman, an English physician, first described three children with characteristics now known as the Angelman syndrome (AS) (1). He noted that all had a stiff, jerky gait, absent speech, excessive laughter and seizures. Other cases were eventually published (2-8) but the condition was considered to be extremely rare and many physicians [...]

Angelman syndrome is usually not recognized at birth or in infancy since the developmental problems are nonspecific during this time.
Parents may first suspect the diagnosis after reading about AS or meeting a child with?Angelman syndrom.?The most common age of diagnosis is between three and seven years when the characteristic behaviors and features become most evident. [...]

Angelman syndrome was known as a distinct clinical entity before the genetics were fully understood. It has taken years of research to elucidate the different genetic mechanisms that can lead to AS. There are 4 major genetic mechanisms that cause Angelman syndrome:

1.Chromosome 15q11 -q13 deletion (a very small piece missing) accounts for 65-75% of AS [...]

In 1996/1997, the laboratories of Dr. Joseph Wagstaff from Children’s Hospital in Boston and Harvard School of Medicine and Dr. Arthur Beaudet from Baylor College of Medicine found a single gene on chromosome l5q called UBE3A that caused Angelman syndrome (figure 3). They showed that some patients with AS have mutations in the UBE3A gene. [...]

Angelman Syndrome Foundation Web Page
Space for this site is provided as a public service by the University of California, San Diego. Dan Harvey’s Angelman Syndrome Information Site If you are an inquisitive parent, conducting research or writing a paper this is the site to visit…
Autism World
Frank van Hof’s Angelman Page

Heaven must be missing an Angel…….. [...]

* Embryology (Board Review)* Principles of Clinical Cytogenetics* Color Atlas of Genetics (Thieme Flexibook)
* Clinical Child Neuropsychiatry* Handbook of Chromosomal Syndromes* Surgical Endocrinology: A Clinical Syndromes Approach
* Prader-Willi Syndrome : Development and Manifestations* Genetics and Genomics of Neurobehavioral Disorders (Contemporary Clinical Neuroscience)* Handbook of Neurodevelopmental and Genetic Disorders in Children* Understanding Mental Retardation (Understanding Health [...]

Individuals with Angelman syndrome usually have near normal life spans and good health. While Angelman syndrome children usually deal with issues such as hyperactivity, attention deficits in school and poor eating and sleeping patterns, many of these issues lessen with age. Usually adults with Angelman syndrome are not capable of living independently but many learn [...]

In the majority of families there is only one individual affected by Angelman syndrome. In these families the affected person usually has a piece of one of their chromosome 15s missing ( deletion ). Deletions can be detected down the microscope or by looking at a persons DNA, their genetic material using special techniques in [...]

The behavioural features of Angelman syndrome are very characteristic. They are first apparent as feeding problems in infancy and a poor sleeping pattern. Many Angelman syndrome children require far less sleep than a normal child. The children are typically happy and sociable and laugh with minimal provacation, sometimes inappropriately in situations which others would not [...]

Direct detection involves Southern blot analysis to identify the origin of mutation by detecting differences in methylation within the AS critical region using the methylation sensitive SNRPN probe.
A paternal-only pattern is diagnostic for AS. For methylation positive AS cases, additional analyses including FISH and UPD studies may be considered to determine the mutational mechanism for [...]

Edwin Weeber, Ph.D., and colleagues reversed the neurological deficits in a mouse model of Angelman syndrome by preventing the inhibition of CaMKII, an enzyme highly expressed in brain regions affected by Angelman syndrome.
The results, which appear in the March issue of Nature Neuroscience (currently available online), reveal an important part of the mechanism underlying the [...]

There is no cure of Angelman syndrome,but the child can benefit from treatment including :

Speech therapy
Physical therapy
Special education
Social skills training
Occupational therapy
Behaviour modification
Communication therapy
Anti-epileptic medication.

There are something that parents can do for children with Angelman syndrome:

Respite care.
Family therapy.
Genetic counselling.
Support organisations, such as the Australian Angelman Syndrome Association.

1.Characteristic symptoms of Angelman syndrome

Hand flapping.
Speech problems.
Hyperactive behaviour.
Stiff-legged walking style.
Jerky, puppet-type movements.
A child easily moved to laughter.
Loving, happy and social demeanour.
Delayed motor development, such as delay in sitting, crawling and walking.
Intellectual disability. A child with Angelman syndrome will have delayed development in all areas, and disability is severe in most cases.

2.Symptoms that are sometimes present [...]

Prenatal history, fetal development, birth weight, and head circumference at birth are usually normal. Young infants with AS may have breast or bottle feeding difficulties (as a result of sucking difficulties) and muscular hypotonia. Angelman syndrome may be first suspected in the toddlers because of delayed gross motor milestones, muscular hypotonia, and speech delay [Williams, [...]

Always Seen/Consistent (100%)

Developmental delay, functionally severe( failure to match developmental milestones of other children)
Profound speech impairment, none or minimal use of words; receptive and non-verbal communication skills higher than verbal ones
Movement or balance disorder(tremulous movement of limbs, stiffness and jerkiness in limbs), ataxia of gait and/or tremulous movement of limbs
Behavioral uniqueness: any combination of frequent [...]

??The prognosis of Angelman syndrome may include the duration of Angelman syndrome, chances of complications of Angelman syndrome, probable outcomes, prospects for recovery, recovery period for Angelman syndrome, survival rates, death rates, and other outcome possibilities in the overall prognosis of Angelman syndrome. Naturally, such forecast issues are by their nature unpredictable.??Analysis of parent-specific DNA [...]

Angelman Syndrome,short for AS,is an uncommon neurogenetic genetic disorder which was first described by pediatrician Dr. Harry Angelman in 1965. Dr. Harry Angelman is an English physician.He noted that all had a stiff, jerky gait, absent speech, excessive laughter and seizures. Other cases were eventually published but the condition was considered to be extremely [...]