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Waardenburg syndrome

Waardenburg syndrome is a genetic disorder associated with hearing loss and changes in skin and hair pigmentation. The syndrome is named for Dutch ophthalmologist Petrus Johannes Waardenburg who first described it. more...

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Pigmentation changes may include irises of varying color (heterochromia), or a patch of white or grey hair. Hearing loss may be absent, moderate, or profound.

Types of Waardenburg syndrome

There are several subtypes of the syndrome, traceable to different genetic variations. Dystopia canthorum, a widened bridge of the nose because of lateral displacement of the inner canthus of each eye, is associated with type I.

  • Type I: associated with mutations in the paired box 3 (PAX3) gene.
  • Type IIa: associated with mutations in the microphthalmia-associated transcription factor (MITF) gene
  • Type IIb: associated with a locus designated WS2B
  • Type IIc: associated with a locus designated WS2C
  • Type IId: associated with a deletion in the SNAI2 gene. Very rare.
  • Type III: associated with mutations in the paired box gene 3 (PAX3) gene
  • Type IV: Waardenberg-Hirschsprung disease, or Waardenburg-Shah syndrome, is associated with mutations in the endothelin-B receptor gene (EDNRB), the gene for its ligand, endothelin-3 (EDN3), or in the SRY-related HMG-box gene 10 (SOX10) gene. This subtype may include neurologic manifestations.

Inheritance

This condition is usually inherited in an autosomal dominant pattern, which means one copy of the altered gene is sufficient to cause the disorder. In most cases, an affected person has one parent with the condition. A small percentage of cases result from new mutations in the gene; these cases occur in people with no history of the disorder in their family.

Some cases of type II and type IV Waardenburg syndrome appear to have an autosomal recessive pattern of inheritance, which means two copies of the gene must be altered for a person to be affected by the disorder. Most often, the parents of a child with an autosomal recessive disorder are not affected but are carriers of one copy of the altered gene.

Source

This article incorporates public domain text from The U.S. National Library of Medicine

Links

  • Waardenburg syndrome at OMIM, Genetic disorder catalog

Read more at Wikipedia.org


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Waardenburg Syndrome - Industry Trend or Event
From Health Management Technology, 3/1/99

* Description

* Types of WS

* Cause

* Research studies

* Additional online resources

Description

Waardenburg syndrome (WS) is an inherited disorder often characterized by varying degrees of hearing loss and changes in skin and hair pigmentation. The syndrome got its name from a Dutch eye doctor named Petrus Johannes Waardenburg who first noticed that people with differently colored eyes often had a hearing impairment. He went on to study over a thousand individuals in deaf families and found that some of them had certain physical characteristics in common.

One commonly observed characteristic of Waardenburg syndrome is two differently colored eyes. One eye is usually brown and the other blue. Sometimes, one eye has two different colors. Other individuals with Waardenburg syndrome may have unusually brilliant blue eyes.

People with WS may also have distinctive hair coloring, such as a patch of white hair or premature gray hair as early as age 12. Other possible physical features include a wide space between the inner corners of eyes called a broad nasal root. In addition persons with WS may have low frontal hairline and their eyebrows may connect. The levels of hearing loss associated with the syndrome can vary from moderate to profound.

Individuals with Waardenburg syndrome may have some or all of the traits of the syndrome. For example, a person with WS may have a white forelock, a patch of white hair near the forehead and no hearing impairment. Others may have white patches of skin and severe hearing impairment. The severity of the hearing impairment varies among individuals with WS as do changes in the skin and hair.

On rare occasions, WS has been associated with other conditions that are present at birth, such as intestinal disorders, elevation of the shoulder blade, and disorders of the spine. A facial abnormality, known as cleft lip and/or palate, also has been associated with WS.

Types of WS [up arrow]

There are at least four types of Waardenburg syndrome. The most common types of WS identified by scientists are Type 1 and Type 2. The different types of physical characteristics a person has determines the type of WS. Persons who have an unusually wide space between the inner corners of their eyes have WS Type 1. Hearing impairments occur in about 20 percent of individuals with this type of Waardenburg syndrome. Persons who do not have a wide space between the inner corners of their eyes, but who have many other WS characteristics are described as having WS Type 2. About 50 percent of persons with WS Type 2 have a hearing impairment or are deaf.

Cause

As a genetic disorder, Waardenburg syndrome is passed down from parent to child much like hair color, blood type, or other physical traits. A child receives genetic material from each parent. Because Waardenburg syndrome is a dominant condition, a child usually inherits the syndrome from just one parent

who has the malfunctioning WS gene. Actually, there is a 50/50 chance that a child of an individual with WS will also have the syndrome.

Research studies [up arrow]

Scientists have identified and located four different genes for Waardenburg syndrome: PAX3, MITF, EDNRB, and EDN3. WS type 1 and 3 have been associated with mutations in the PAX3 gene; WS type 2 with the MITF gene; and WS type 4 with the EDNRB and EDN3 genes. While scientists are studying all of these genes, currently, the most information is available on the PAX3 and MITF genes and their role in Waardenburg syndrome.

The PAX3 gene is located on chromosome 2 and controls some aspects of the development of the face and inner ear. The MITF gene and is found on chromosome 3. It also controls the development of the ear and hearing. Scientists are now studying these genes to better understand how they operate in controlling the normal growth of the ear and the development of hearing. This information will help scientists understand why persons with WS sometimes develop hearing problems.

Additional online resources [up arrow]

Laboratory of Molecular Genetics

Division of Intramural Research, NIDCD The goal of the Laboratory of Molecular Genetics is to identify, clone and characterize the genes that contribute to communication disorders. Presently, the laboratory is studying the genes responsible for hereditary hearing impairment. Check the section on "Selected Publications" for new studies on Waardenburg syndrome.

CHID database search

CHID is a database produced by health-related agencies of the Federal Government. This database provides titles, abstracts, and availability information for health information and health education resources. The value of this database is that it lists a wealth of health promotion and education materials and program descriptions that are not indexed elsewhere. Search the database using "Waardenburg syndrome" for health information materials.

PubMed database search

PubMed is a database developed by the National Library of Medicine in conjunction with publishers of biomedical literature as a search tool for accessing literature citations and linking to full-text journals at web sites of participating publishers. Search the database using "Waardenburg syndrome" for medical journal articles.

March 1999 NIH Pub. No. 91-3260

For more information, contact the NIDCD Information Clearinghouse.

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