17q21.31 Deletion

Below is a summary for 17q21.31 deletion syndrome or Koolen-de Vries syndrome observed in research publications. This is not meant to take the place of medical advice.

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What is 17q21.31 deletion syndrome or Koolen-de Vries syndrome?

17q21.31 deletion syndrome happens when a person is missing a piece of chromosome 17, one of the body’s 46 chromosomes. Chromosomes are structures in our cells that house our genes. The missing piece can affect learning and how the body develops.

17q21.31 deletion syndrome is also called Koolen-de Vries syndrome. This condition is caused by a deletion in the KANSL1 gene, which is missing when a person has a 17q21.31 deletion.

Symptoms

Because the 17q21.31 region is important for the proper function of the body’s cells, some people may have:

Developmental delay
Intellectual disability
Low muscle tone
Seizures
Undescended testicles in males
Heart or kidneys defects
Language issues and nasal voice
Very social behavior
Anxiety
Feeding difficulty
Brain changes seen on magnetic resonance imaging (MRI)
Hip dislocation
Overly flexible joints
Rounding of the upper back
Sideways curvature of the spine, also called scoliosis

Do people who have 17q21.31 deletion syndrome look different?

People with 17q21.31 deletion syndrome may look different. Appearance can vary and can include some but not all of these features:

Long face
Pear-shaped nose with a round tip
Large ears
Opening between the eyelids that is narrow or slants upward
Drooping eyelids
A skin fold covering the inner corner of the eye
High forehead
Unusual hair texture
Smaller than average teeth size
Fewer number of teeth than average
Smaller than average head size
Short height

How many people have 17q21.31 deletion syndrome?

As of 2021, at least 100 children and adults with 17q21.31 deletion syndrome have been described in medical research. The oldest person known to date is 63 years old.

Support Resources

Simons Searchlight Community – 17q21.31 Deletion Facebook group
Koolen-De Vries Syndrome Foundation Website – KVDSfoundation.org
– Koolen-De Vries Syndrome Foundation – Facebook page
– Koolen-De Vries Syndrome Foundation – Facebook group
Unique – 17q21.31 Deletion

GeneReviews

GeneReviews are a great resource to bring to your child’s clinicians. These publications provide a summary of current research on genetic conditions and information on ongoing care.

Check out the GeneReviews for 17q21.31 Deletions.

Research Article Summaries

We currently do not have any article summaries for 17q21.31 Deletion, but we add resources to our website as they become available.

The information available about 17q21.31 Deletion is limited, and families and doctors share a critical need for more information. As we learn more from children who have this gene change, we expect our list of resources and information to grow.

Full versions of published research articles can be found on PubMed. PubMed is a National Institutes of Health (NIH) online database that is free. It has a collection of both medical and scientific research articles. A PubMed search for 17q21.31 Deletion articles can be found here.

Research Opportunities

Simons Searchlight

Help the Simons Searchlight team learn more about 17q21.31 Deletion genetic changes by taking part in our research. You can learn more about the project and sign up here.