GJA1 gene

Craniometaphyseal dysplasia

A mutation in the GJA1 gene has been found to cause autosomal recessive craniometaphyseal dysplasia in a small number of people. This condition is characterized by thickening of bones in the skull (cranium) and widening of a region at the end of long bones known as the metaphysis. The mutation is present in both copies of the GJA1 gene. It changes a single protein building block (amino acid) in the connexin 43 protein: at position 239, the amino acid arginine is replaced with the amino acid glutamine (written as Arg239Gln or R239Q). It is unknown how this change affects the function of the connexin 43 protein or leads to the bone abnormalities characteristic of craniometaphyseal dysplasia.

Erythrokeratodermia variabilis et progressiva

At least two mutations in the GJA1 gene have been found to cause erythrokeratodermia variabilis et progressiva (EKVP), a skin disorder characterized by areas of hyperkeratosis, which is abnormally thickened skin, and temporarily reddened patches called erythematous areas. The GJA1 gene mutations that cause this disorder are present in one of the two copies of the gene in each cell. Each of the known mutations changes a single amino acid in the connexin 43 protein. These changes lead to the production of an abnormal version of the protein that is unable to reach the cell surface to become part of gap junctions. Instead, after it is produced, the abnormal protein becomes trapped in a cell structure called the Golgi apparatus. It is unclear how a shortage of connexin 43 at the cell surface affects the structure of gap junctions in the outermost layer of skin (epidermis), or how these changes result in the skin abnormalities characteristic of EKVP.

Nonsyndromic hearing loss

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Oculodentodigital dysplasia

At least 76 mutations in the GJA1 gene have been found to cause oculodentodigital dysplasia, a condition characterized by abnormalities of the eyes (oculo-), teeth (dento-), and fingers (digital). The GJA1 gene mutations that cause this disorder are usually present in one of the two copies of the gene in each cell. Most of these mutations change an amino acid in connexin 43. A different type of change in the GJA1 gene causes people to have oculodentodigital dysplasia with palmoplantar keratoderma. Palmoplantar keratoderma is a condition that causes skin on the palms of the hands and the soles of the feet to become thick, scaly, and calloused. The mutation that causes this condition deletes two DNA building blocks (nucleotides) to create a premature stop signal in the instructions for making connexin 43. As a result, an abnormally short, nonfunctional protein is produced.

Gap junctions formed with abnormal connexin 43 proteins are often permanently closed, preventing the transport of any molecules. Some mutations prevent connexin 43 proteins from traveling to the cell surface where they are needed to form gap junctions. These disruptions impair communication between cells, which is thought to cause the eye, tooth, and finger abnormalities characteristic of oculodentodigital dysplasia.

Coloboma

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Critical congenital heart disease

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Heterotaxy syndrome

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Other disorders

Mutations in one copy of the GJA1 gene in each cell can cause isolated syndactyly type III, which is characterized by fusion of the ring and pinky fingers (fourth and fifth fingers) and sometimes shortening of the pinky finger. Syndactyly type III is a characteristic feature in oculodentodigital dysplasia (described above); however, some people have syndactyly type III without other features of oculodentodigital dysplasia, which is known as isolated syndactyly type III. It is unclear why some people with GJA1 gene mutations develop only the finger abnormalities and others have additional developmental abnormalities characteristic of oculodentodigital dysplasia.

A mutation in one copy of the GJA1 gene has been found to cause palmoplantar keratoderma and congenital alopecia 1, a condition characterized by skin problems, an absence of hair from birth (congenital alopecia), and often nail abnormalities. The mutation identified in this disorder leads to production of an altered connexin 43 protein. Channels made with the altered protein open more easily than normal, increasing the transport of molecules. Researchers suggest that abnormal signaling in cells that form the skin, hair, and nails results in the features characteristic of palmoplantar keratoderma and congenital alopecia 1.

Other mutations in one copy of the GJA1 gene in each cell have been found in a small number of people who have died suddenly with no known cause in infancy (sudden infant death syndrome) or early adulthood (sudden unexplained nocturnal death). Doctors suspect that abnormalities of heart function associated with GJA1 gene mutations may contribute to sudden death. It is thought that other genetic and environmental factors, many of which have not been identified, also play a part in determining the risk of these disorders. Mutations in one copy of the GJA1 gene may also contribute to heart malformations, although the role of such a genetic change is unclear.