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CLCN2 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

CLCN2 gene

The CLCN2 gene provides instructions for creating chloride channels that are essential for regulating electrical signals and fluid balance within cells, particularly in the brain.

Normal Function

The CLCN2 gene belongs to the CLC family of genes, which provide instructions for making chloride channels. These channels, which transport negatively charged chlorine atoms (chloride ions), play a key role in a cell's ability to generate and transmit electrical signals. Some chloride channels regulate the flow of chloride ions across cell membranes, while others transport chloride ions within cells.

The CLCN2 gene provides instructions for making a chloride channel called ClC-2. These channels are embedded within the outer membrane of most cells, and they transport chloride ions in and out of cells. The channel's function is thought to be particularly important in nerve cells (neurons) in the brain. The ClC-2 channel regulates the size (volume) of neurons by playing a role in the intake and release of water as well as maintaining a normal balance of ions in cells.

Health Conditions Related to Genetic Changes

CLCN2-related leukoencephalopathy

At least 18 mutations in the CLCN2 gene have been found to cause CLCN2-related leukoencephalopathy. This condition is characterized primarily by problems with coordination and balance (ataxia) but can also cause learning disabilities, frequent headaches, and vision problems.

Some CLCN2 gene mutations change single protein building blocks (amino acids) in the ClC-2 channel, impairing the stability of the channel and reducing channel function. Other CLCN2 gene mutations result in a complete loss of channel function, typically by leading to the production of an abnormally short channel protein. A shortened protein is either trapped inside the cell and cannot get to the cell membrane or is quickly broken down.

As a result of this reduction in ClC-2 channel activity, certain brain cells and the myelin that surrounds neurons become filled with too much water and cannot function properly. Fluid-filled myelin cannot transmit nerve impulses effectively, resulting in neurological problems such as ataxia and the other signs and symptoms of CLCN2-related leukoencephalopathy.

Juvenile myoclonic epilepsy

MedlinePlus Genetics provides information about Juvenile myoclonic epilepsy.

Other Names for This Gene

  • chloride channel 2
  • chloride channel, voltage-sensitive 2
  • CIC-2
  • clC-2
  • CLC2
  • ECA2
  • ECA3
  • EGI11
  • EGI3
  • EGMA
  • EJM6
  • EJM8
  • LKPAT

Frequently Asked Questions

The primary early symptoms of CLCN2-related leukoencephalopathy often involve problems with coordination and balance, known as ataxia. This might manifest as clumsiness, difficulty walking steadily, or challenges with fine motor skills. Other symptoms can include frequent headaches, learning disabilities, and vision problems. These symptoms typically begin in childhood or adolescence and tend to be progressive, meaning they gradually worsen over time, impacting daily activities and quality of life.
Diagnosis of CLCN2-related leukoencephalopathy typically involves a combination of clinical evaluation, neuroimaging, and genetic testing. An MRI of the brain can reveal characteristic changes in the white matter, which supports the diagnosis. Definitive confirmation is made through genetic testing, which analyzes the CLCN2 gene for mutations. The presence of a pathogenic mutation in the CLCN2 gene confirms the diagnosis. Genetic counselors can help interpret the specific mutation and its potential impact.
Currently, there is no specific cure for CLCN2-related leukoencephalopathy, so management focuses on alleviating symptoms and improving quality of life. This often involves physical therapy to help with coordination and balance, occupational therapy to assist with daily living activities, and speech therapy if communication is affected. Medications may be used to manage specific symptoms like headaches or seizures if they occur. Regular monitoring by neurologists and other specialists is important to adapt care as symptoms progress.
CLCN2-related leukoencephalopathy is inherited in an autosomal dominant pattern. This means that only one copy of the mutated CLCN2 gene is sufficient to cause the condition. If a parent has the condition, there is a 50% chance that each child they have will inherit the mutated gene and develop the disorder. This inheritance pattern has significant implications for family planning, and genetic counseling is highly recommended to discuss risks, testing options, and reproductive choices.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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