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Genetic and Rare Diseases Information Center (GARD)

Other Names for this Disease
  • GSM 1
  • Hereditary chin tremor/myoclonus
  • Hereditary geniospasm
  • Trembling chin
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Your Question

Can you inform me about hereditary geniospasm and how it is diagnosed?

Our Answer

We have identified the following information that we hope you find helpful. If you still have questions, please contact us.

What is hereditary geniospasm?

Hereditary geniospasm is a movement disorder that causes episodes of involuntary tremors of the chin and lower lip. The episodes may last anywhere from a few seconds to hours and may occur spontaneously or be brought on by stress. The episodes usually first appear in infancy or childhood and tend to lessen in frequency with age. Hereditary geniospasm is believed to be inherited in an autosomal dominant pattern. Although the exact gene(s) that cause the condition are unknown, it has been suggested that mutations in a gene on chromosome 9 may be responsible in some families.[1][2]
Last updated: 6/5/2013

How might hereditary geniospasm be diagnosed?

Although we were unable to locate laboratories offering genetic testing for hereditary geniospasm, the condition can be diagnosed on the basis of a clinical evaluation performed by a health care professional such as a neurologist who specializes in movement disorders.
Last updated: 6/5/2013

How might I find a movement disorder specialist?

In addition to speaking with your health care provider regarding a referral, you can search online directories of professional societies for your country to locate neurologists that specialize in movement disorders. For those individuals in the United States, you can search the following links from the American Academy of Neurology Foundation and the American Medical Association, respectively.
Find a Neurologist - American Academy of Neurology Foundation
DoctorFinder - American Medical Association

The Movement Disorder Society is a professional society that has members from throughout the world.

The Movement Disorder Society International Secretariat
555 East Wells Street, Suite 1100
Milwaukee, WI 53202-3823
United States
Telephone: 414-276-2145
Fax: 414-276-3346
Web site:

Another way to find movement disorders specialists is to connect with advocacy organizations that offer information and supportive resources for movement disorders such as, but not limited to, the group listed below.

Web site:
Online directory:
Last updated: 7/21/2009

How can I find a genetics professional in my area?

Genetics clinics are a source of information for individuals and families regarding genetic conditions, treatment, inheritance, and genetic risks to other family members. More information about genetic consultations is available from Genetics Home Reference. To find a genetics clinic, we recommend that you contact your primary healthcare provider for a referral.

The following online resources can help you find a genetics professional in your community:

Last updated: 1/21/2014