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Primary ciliary dyskinesia
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Reviewed August 2010
What is primary ciliary dyskinesia?
Primary ciliary dyskinesia is a disorder characterized by chronic respiratory tract infections, abnormally positioned internal organs, and the inability to have children (infertility). The signs and symptoms of this condition are caused by abnormal cilia and flagella. Cilia are microscopic, finger-like projections that stick out from the surface of cells. They are found in the linings of the airway, the reproductive system, and other organs and tissues. Flagella are tail-like structures similar to cilia that propel sperm cells forward.
In the respiratory tract, cilia move back and forth in a coordinated way to move mucus towards the throat. This movement of mucus helps to eliminate fluid, bacteria, and particles from the lungs. Most babies with primary ciliary dyskinesia experience breathing problems at birth, which suggests that cilia play an important role in clearing fetal fluid from the lungs. Beginning in early childhood, affected individuals develop frequent respiratory tract infections. Without properly functioning cilia in the airway, bacteria remain in the respiratory tract and cause infection. People with primary ciliary dyskinesia also have year-round nasal congestion and a chronic cough. Chronic respiratory tract infections can result in a condition called bronchiectasis, which damages the passages leading from the windpipe to the lungs (the bronchi) and can cause life-threatening breathing problems.
Some individuals with primary ciliary dyskinesia have abnormally placed organs within their chest and abdomen. These abnormalities arise early in embryonic development when the differences between the left and right sides of the body are established. About 50 percent of people with primary ciliary dyskinesia have a mirror-image reversal of their internal organs (situs inversus totalis). For example, in these individuals the heart is on the right side of the body instead of on the left. Situs inversus totalis does not cause any apparent health problems. When someone with primary ciliary dyskinesia has situs inversus totalis, they are often said to have Kartagener syndrome.
At least 6 percent of people with primary ciliary dyskinesia have a condition known as heterotaxy or situs ambiguus, which is characterized by abnormalities of the heart, liver, intestines, and/or spleen. These organs may be structurally abnormal or improperly positioned. In addition, affected individuals may lack a spleen (asplenia) or have multiple spleens (polysplenia). Heterotaxy results from problems establishing the left and right sides of the body during embryonic development. The severity of heterotaxy varies widely among affected individuals.
Primary ciliary dyskinesia can also affect the ability to have children (fertility). Vigorous movements of the flagellum are necessary to propel the sperm cell forward to the female egg cell. Because their sperm do not move properly, males with primary ciliary dyskinesia are usually unable to father children. Infertility occurs in some affected females and is likely due to abnormal cilia in the fallopian tubes.
Other features of primary ciliary dyskinesia include an accumulation of fluid in the brain (hydrocephalus) and recurrent ear infections (otitis media). Otitis media is especially common in young children with this condition and can lead to permanent hearing loss if untreated. These features of primary ciliary dyskinesia are likely related to abnormal cilia within the brain and inner ear.
How common is primary ciliary dyskinesia?
Primary ciliary dyskinesia occurs in approximately 1 in 16,000 individuals.
What genes are related to primary ciliary dyskinesia?
Primary ciliary dyskinesia can result from mutations in at least nine different genes. These genes provide instructions for making proteins that form the inner structure of cilia and produce the force needed for cilia to bend. Coordinated back and forth movement of cilia is necessary for the normal functioning of many organs and tissues. The movement of cilia also helps establish the left-right axis (the imaginary line that separates the left and right sides of the body) during embryonic development.
Mutations in the genes that cause primary ciliary dyskinesia result in defective cilia that move abnormally or are unable to move (immotile). Because cilia have many important functions within the body, defects in these cell structures cause a variety of signs and symptoms.
Mutations in the DNAI1 and DNAH5 genes account for up to 38 percent of all cases of primary ciliary dyskinesia. Mutations in the other genes associated with this condition are found in only a small percentage of cases. In many people with primary ciliary dyskinesia, the cause of the disorder is unknown.
See a list of genes associated with primary ciliary dyskinesia.
How do people inherit primary ciliary dyskinesia?
This condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.
Where can I find information about diagnosis or management of primary ciliary dyskinesia?
These resources address the diagnosis or management of primary ciliary dyskinesia and may include treatment providers.
General information about the diagnosis and management of genetic conditions is available in the Handbook. Read more about genetic testing, particularly the difference between clinical tests and research tests.
To locate a healthcare provider, see How can I find a genetics professional in my area? in the Handbook.
Where can I find additional information about primary ciliary dyskinesia?
You may find the following resources about primary ciliary dyskinesia helpful. These materials are written for the general public.
You may also be interested in these resources, which are designed for healthcare professionals and researchers.
What other names do people use for primary ciliary dyskinesia?
What if I still have specific questions about primary ciliary dyskinesia?
Where can I find general information about genetic conditions?
The Handbook provides basic information about genetics in clear language.
These links provide additional genetics resources that may be useful.
What glossary definitions help with understanding primary ciliary dyskinesia?
autosomal ; autosomal recessive ; axis ; bacteria ; bronchi ; bronchiectasis ; cell ; chronic ; dyskinesia ; egg ; embryonic ; fertility ; gene ; hydrocephalus ; infection ; infertility ; mucus ; otitis media ; recessive ; respiratory ; sperm ; syndrome
You may find definitions for these and many other terms in the Genetics Home Reference Glossary.
See also Understanding Medical Terminology.
References (9 links)
The resources on this site should not be used as a substitute for professional medical care or advice. Users seeking information about a personal genetic disease, syndrome, or condition should consult with a qualified healthcare professional. See How can I find a genetics professional in my area? in the Handbook.