Pendrin

Pendrin

Diagram of thyroid hormone synthesis, showing the role of pendrin.

Pendrin is a protein encoded by the SLC26A4 gene in humans. It is a member of the solute carrier family 26 and functions as an anion exchanger. Pendrin is primarily expressed in the thyroid gland, the inner ear, and the kidney.

Function

Pendrin plays a crucial role in the transport of ions across cell membranes. In the thyroid gland, pendrin is involved in the transport of iodide, which is essential for the synthesis of thyroid hormones. The protein facilitates the exchange of chloride and iodide ions, contributing to the production of thyroxine (T4) and triiodothyronine (T3).

In the inner ear, pendrin is important for maintaining the ionic composition of the endolymph, a fluid in the cochlea and vestibular system. Proper function of pendrin is necessary for normal hearing and balance.

In the kidney, pendrin is expressed in the cortical collecting duct and is involved in bicarbonate secretion and chloride reabsorption, playing a role in maintaining acid-base balance.

Clinical Significance

Mutations in the SLC26A4 gene can lead to Pendred syndrome, an autosomal recessive disorder characterized by sensorineural hearing loss and goiter. Pendred syndrome is associated with an impaired ability to transport iodide in the thyroid, leading to reduced thyroid hormone synthesis and potential hypothyroidism.

Pendrin dysfunction is also implicated in other conditions such as non-syndromic hearing loss and enlarged vestibular aqueduct.

Research

Ongoing research is focused on understanding the precise mechanisms by which pendrin functions in different tissues and its role in various diseases. Studies are also exploring potential therapeutic targets for conditions associated with pendrin dysfunction.

Related Pages

• Thyroid hormone
• SLC26A4
• Pendred syndrome
• Thyroid gland
• Hearing loss