Each individual with Wolf-Hirschhorn syndrome is unique. Most individuals with Cri-du-chat syndrome have some degree of development and intellectual delay, and are anywhere from mildly to severely affected. Other possible health concerns include hearing loss, abnormalities in the heart, eyes, brain, skeleton, and urinary system, and seizures (which generally go away with age).
People with Wolf-Hirschhorn syndrome can have loving relationships with friends and family, and learn and make progress in their social skills and communication at their own pace. Most individuals with Wolf-Hirschhorn syndrome will need support and care over their lifetime given the related medical issues.
Wolf-Hirschhorn syndrome is caused by a deletion on the short arm (p) of chromosome 4. The symptoms of Wolf-Hirschhorn syndrome are believed to be caused by the loss of multiple genes on this chromosome due to the deletion. Most of the time (85-90%), this deletion is said to be ‘de novo’, which means that it was not passed down from a parent; it is brand new in the individual who is diagnosed with the condition. In this case, the deletion occurs in the development of an egg or a sperm and is then copied over into every cell in the developing baby’s body.
In some cases, Wolf-Hirschhorn syndrome can result from a genetic change causing chromosome 4 to become a ring chromosome. A ring chromosome is created when a chromosome breaks at both ends and the two ends fuse to form a circle. The loss of genetic material when this happens can cause Wolf-Hirschhorn syndrome.
In other cases, Wolf-Hirschhorn syndrome can be inherited when one parent’s chromosome 4 is part of a balanced translocation. A balanced translocation is when a piece of chromosome 4 breaks off and trades places with a piece of another chromosome. No genetic material is lost when this happens, the chromosome pieces just trade places. Because the parent has not lost any genetic material, they do not show symptoms for any genetic condition. However, when they have children, their egg or sperm can be missing genetic material from chromosome 4 leading to a higher chance of Wolf-Hirschhorn.
Wolf-Hirschhorn syndrome is associated with a variety of health and developmental concerns, including:
The severity of symptoms may be related to the amount of genetic material missing from chromosome 4.
Because most cases (85-90%) of Wolf-Hirschhorn syndrome are caused by a de novo deletion on chromosome 4, there is not expected to be a high chance of having another child with it. However, if the deletion occurred early enough to be present in more than one egg or sperm, there could be a slight increased risk to have another child with the condition.
If Wolf-Hirschhorn syndrome was inherited from a parent with a chromosome 4 translocation, the chance of having another child with it depends upon the specific pieces of chromosomes exchanged. If you are found to have a chromosome translocation, meeting with a specialist, such as a genetic counselor, can help to better understand what your specific risks may be.
Many families of children with Wolf-Hirschhorn share valuable information and support with each other through the wolfhirschhorn.org. Their web site has lots of helpful information for families with a member who has Wolf-Hirschhorn syndrome.
There is no cure for Wolf-Hirschhorn syndrome. However, medical management and therapeutic intervention can help individuals reach their full potential. Individuals with Wolf-Hirschhorn syndrome will require regular follow-up and treatment by a variety of health specialists to treat their specific needs. Intervention programs such as physical therapy, special education, speech therapy, and occupational therapy can be beneficial to individuals with Wolf-Hirschhorn syndrome. Basic health care recommendations are available on 4p-supportgroup.org/.
It is important to recognize that the health and developmental effects of Wolf-Hirschhorn syndrome vary from person to person. Speech and mobility issues can be improved with intervention programs. Individuals with Wolf-Hirschhorn syndrome may have moderate to severe intellectual disabilities, and may benefit from special education. Medicine can also be used to manage seizures. Most individuals with Wolf-Hirschhorn syndrome will need support and care over their lifetime given their health and developmental concerns. Life expectancy is unknown for individuals with Wolf-Hirschhorn syndrome, but some individuals have lived into their 40’s.
Wolf-Hirschhorn syndrome is believed to affect between 1 in 20,000 and 1 in 50,000 people.