What is the chromosomal abnormality of Williams syndrome?

Williams syndrome is usually caused by a random genetic mutation, or error, in chromosome 7. This means that most people with Williams syndrome have not inherited the condition from a parent. People with Williams syndrome have a 50% chance of passing the condition on to each of their offspring.

What chromosome is affected by Williams syndrome?

Williams syndrome is a rare genetic disorder that is caused by the deletion of genetic material on chromosome 7.

What gene mutation causes Williams syndrome?

What causes Williams syndrome? Williams syndrome is caused by a missing piece ( deletion ) of genetic material from a specific region of chromosome 7. The deleted region includes more than 25 genes . CLIP2, ELN, GTF2I, GTF2IRD1, and LIMK1 are among the genes that are typically deleted in people with Williams syndrome.

What is the karyotype for Williams syndrome?

Williams Syndrome. Williams Syndrome is the result of a segmental aneuploid deletion of a small portion of the long arm of Chromosome 7 (2n = 46, 7q11.

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What are the symptoms of Williams syndrome?

What are the symptoms of Williams syndrome?

  • specific facial features like a wide mouth, small upturned nose, widely spaced teeth, and full lips.
  • colic or feeding problems.
  • attention deficit hyperactivity disorder (ADHD)
  • learning disorders.
  • inward bend of pinky finger.
  • specific phobias.
  • short stature.
  • speech delays.

What is the 7th chromosome?

CM000669 (FASTA) Chromosome 7 is one of the 23 pairs of chromosomes in humans, who normally have two copies of this chromosome. Chromosome 7 spans about 159 million base pairs (the building material of DNA) and represents between 5 and 5.5 percent of the total DNA in cells.

What is Down syndrome chromosome?

Typically, a baby is born with 46 chromosomes. Babies with Down syndrome have an extra copy of one of these chromosomes, chromosome 21. A medical term for having an extra copy of a chromosome is ‘trisomy. ‘ Down syndrome is also referred to as Trisomy 21.

What does it mean to have a genetic defect on chromosome 7 in terms of DNA genes and chromosomes?

Changes in chromosome 7 include an extra copy of some genetic material from this chromosome in each cell (partial trisomy 7) or a missing segment of the chromosome in each cell (partial monosomy 7). In some cases, several DNA building blocks (nucleotides) are abnormally deleted or duplicated in part of chromosome 7.

Can you be a carrier of Williams syndrome?

A person with Williams syndrome has a 50% chance of having a child with Williams syndrome while a parent with an inversion of the WS region has a 1 in 9500 chance (the same as for those without an inversion) of having a child with Williams syndrome. There is no such thing as being a “carrier” of Williams syndrome.

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Can you have a mild case of Williams syndrome?

Children with Williams syndrome typically have a personality that is friendly, outgoing, and/or talkative. The appropriate use of language and vocabulary range may be unusually enhanced in some children with this disorder. Mild to moderate mental retardation may occur.

What is meant by a karyotype?


A karyotype is an individual’s collection of chromosomes. The term also refers to a laboratory technique that produces an image of an individual’s chromosomes. The karyotype is used to look for abnormal numbers or structures of chromosomes.

What does the 8th chromosome do?

Chromosome 8 spans about 145 million base pairs (the building material of DNA) and represents between 4.5 and 5.0% of the total DNA in cells. About 8% of its genes are involved in brain development and function, and about 16% are involved in cancer.

Chromosome 8
GenBank CM000670 (FASTA)

Is Williams syndrome life threatening?

Challenges faced by a person with WS include difficulty understanding spatial relations, abstract reasoning, and numbers, and some potentially life-threatening complications, such as Cardiovascular problems and a high level of calcium in the blood.

What is the life expectancy of a person with Williams syndrome?

Some people with Williams syndrome may have a reduced life expectancy due to complications of the disease (such as cardiovascular involvement). No studies specifically exist on life expectancy, although individuals have been reported to live into their 60s.

How does Williams syndrome affect the brain?

MRI studies of WS have demonstrated a series of brain abnormalities, including decreased brain size, with a relatively greater decrease in the volume of the cerebral white matter volume as compared to the cerebral gray matter.

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