About Coffin-Siris Syndrome
The New York Center for Rare Diseases supports the mission and guidelines of the Genetic and Rare Diseases Information Center (GARD). The following information is provided by the NIH.
Summary
Coffin-Siris syndrome is a genetic condition that causes variable degrees of learning disability, developmental delays, underdeveloped ‘pinky’ toenails or fingernails, and distinct facial features. It can be caused by a change in any of several genes including the ARID1A, ARID1B, SMARCA4, SMARCB1, DPF2 or SMARCE1 genes. Coffin-Siris syndrome follows an autosomal dominant pattern of inheritance, however it usually occurs for the first time in a family due to a new genetic change. Occupational, physical, and/or speech therapy can help affected individuals reach their full potential.
Causes
What Causes This Disease?
Genetic Mutations: Coffin-Siris syndrome is caused by genetic mutations, also known as pathogenic variants. Genetic mutations can be hereditary, when parents pass them down to their children, or they may occur randomly when cells are dividing. Genetic mutations may also result from contracted viruses, environmental factors, such as UV radiation from sunlight exposure, or a combination of any of these.
If you suspect you may have this disease, you may want to start collecting your family health history. Information such as other family members who have had similar symptoms, when their/your symptoms first appeared, or exposures to any potential disease-causing environmental factors should be discussed with your medical team.
Known Genetic Mutations: Coffin-Siris syndrome is caused by genetic mutations in the following known gene(s):
SMARCB1, SOX4, ARID2, SMARCC2, ARID1A, DPF2, SOX11, SMARCD1, SMARCE1, SMARCA4, ARID1B
Given these known genetic mutation(s), you may want to ask your health care team if genetic testing is right for you. Genetic tests are laboratory tests that use samples of blood, saliva, or other tissues to help identify changes in genes, chromosomes, or proteins. Genetic testing can help confirm or rule out a suspected genetic disease, or can provide other useful information to your health care team.
Can This Disease Be Passed Down From Parent to Child?
Yes. It is possible for a biological parent to pass down genetic mutations that cause or increase the chances of getting this disease to their child. This is known as inheritance. Knowing whether other family members have previously had this disease, also known as family health history, can be very important information for your medical team.
There are multiple ways, or patterns, a disease can be inherited depending on the gene(s) involved. Based on GARD’s current data, this disease can be inherited in the following pattern(s):
Autosomal Dominant: Autosomal means the gene involved is located on one of the numbered chromosomes. Dominant means that a child only needs to inherit one copy of the mutated gene, from either biological parent, to be affected by the disease.
People affected by an autosomal dominant disease have a 50% chance of passing on the mutated gene to their biological child.