Pendred syndrome, a genetic disorder causing hearing loss, affects approximately three out of every 1,000 children. This condition is responsible for up to eight percent of all cases of hearing loss. In addition to its auditory effects, Pendred syndrome can also lead to the development of goiters in the neck. Although diagnosing this syndrome can be challenging, several treatment options are available for managing its symptoms.
Understanding Pendred Syndrome
Pendred Syndrome, first identified by English physician Vaughan Pendred in 1896, is a rare genetic disorder that affects the thyroid and hearing abilities. Pendred syndrome is typically characterized by the presence of goiters, hearing loss, and in some cases, speech impairment.
One of the distinct features of Pendred syndrome is the abnormal development of specific ear bones, which can lead to balance issues in some individuals. This condition is typically present at birth, and its severity can vary from person to person.
The Role of Genetics in Pendred Syndrome
When it comes to Pendred syndrome, an inherited disorder, genetics play a significant role in its development. Specifically, the SLC26A4 gene on chromosome 7 is responsible for instructing the body on how to produce a vital protein called pendrin. This protein is involved in the transportation of chloride, iodide, and bicarbonate ions within the body.
In individuals with Pendred syndrome, however, there is a mutation in the SLC26A4 gene, which inhibits the production of pendrin. This disruption in protein production has been found to affect the development of certain bones in the ear as well as cause the loss of specific sensory cells, ultimately leading to hearing loss.
The inheritance pattern of the mutated SLC26A4 gene is autosomal recessive. This means that for a child to develop Pendred syndrome, they must inherit mutated copies of the SLC26A4 gene from both parents. In such cases, the risk of developing the syndrome is significantly higher.
Furthermore, there is an increased risk of Pendred syndrome if a child inherits one copy of the mutated SLC26A4 gene along with a mutation in either the FOXI1 or KCNJ10 gene.