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Disease Profile

Hereditary geniospasm

Prevalence estimates on Rare Medical Network websites are calculated based on data available from numerous sources, including US and European government statistics, the NIH, Orphanet, and published epidemiologic studies. Rare disease population data is recognized to be highly variable, and based on a wide variety of source data and methodologies, so the prevalence data on this site should be assumed to be estimated and cannot be considered to be absolutely correct.


US Estimated

Europe Estimated

Age of onset






Autosomal dominant A pathogenic variant in only one gene copy in each cell is sufficient to cause an autosomal dominant disease.


Autosomal recessive Pathogenic variants in both copies of each gene of the chromosome are needed to cause an autosomal recessive disease and observe the mutant phenotype.


dominant X-linked dominant inheritance, sometimes referred to as X-linked dominance, is a mode of genetic inheritance by which a dominant gene is carried on the X chromosome.


recessive Pathogenic variants in both copies of a gene on the X chromosome cause an X-linked recessive disorder.


Mitochondrial or multigenic Mitochondrial genetic disorders can be caused by changes (mutations) in either the mitochondrial DNA or nuclear DNA that lead to dysfunction of the mitochondria and inadequate production of energy.

Multigenic or multifactor Inheritance involving many factors, of which at least one is genetic but none is of overwhelming importance, as in the causation of a disease by multiple genetic and environmental factors.


Not applicable


Other names (AKA)

Trembling chin; GSM 1; Hereditary chin tremor/myoclonus;


Congenital and Genetic Diseases; Nervous System Diseases


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 that causes the condition is unknown, it has been suggested that mutations in a gene on chromosome 9 may be responsible in some families.[1][2]


This table lists symptoms that people with this disease may have. For most diseases, symptoms will vary from person to person. People with the same disease may not have all the symptoms listed. This information comes from a database called the Human Phenotype Ontology (HPO) . The HPO collects information on symptoms that have been described in medical resources. The HPO is updated regularly. Use the HPO ID to access more in-depth information about a symptom.

Medical Terms Other Names
Learn More:
Percent of people who have these symptoms is not available through HPO
Excessive, persistent worry and fear
Autosomal dominant inheritance
Chin myoclonus


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.


Hereditary geniospasm, which may also be referred to as hereditary essential chin myoclonus, is generally considered a benign disorder although in some cases it can cause anxiety and social embarrassment.[4] Significant improvement with age has been reported.[3] Several drugs are used to treat myoclonus, such as benzodiazepines and anticonvulsants. However, individuals may not respond to a single medication and may experience significant side effects if a combination of drugs is used. It has also been suggested that botulinum toxin be considered as a primary treatment because it has been shown to be effective and well tolerated.[4]


Support and advocacy groups can help you connect with other patients and families, and they can provide valuable services. Many develop patient-centered information and are the driving force behind research for better treatments and possible cures. They can direct you to research, resources, and services. Many organizations also have experts who serve as medical advisors or provide lists of doctors/clinics. Visit the group’s website or contact them to learn about the services they offer. Inclusion on this list is not an endorsement by GARD.

Organizations Supporting this Disease

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    These resources provide more information about this condition or associated symptoms. The in-depth resources contain medical and scientific language that may be hard to understand. You may want to review these resources with a medical professional.

    In-Depth Information

    • The Monarch Initiative brings together data about this condition from humans and other species to help physicians and biomedical researchers. Monarch’s tools are designed to make it easier to compare the signs and symptoms (phenotypes) of different diseases and discover common features. This initiative is a collaboration between several academic institutions across the world and is funded by the National Institutes of Health. Visit the website to explore the biology of this condition.
    • Online Mendelian Inheritance in Man (OMIM) is a catalog of human genes and genetic disorders. Each entry has a summary of related medical articles. It is meant for health care professionals and researchers. OMIM is maintained by Johns Hopkins University School of Medicine. 
    • Orphanet is a European reference portal for information on rare diseases and orphan drugs. Access to this database is free of charge.
    • PubMed is a searchable database of medical literature and lists journal articles that discuss Hereditary geniospasm. Click on the link to view a sample search on this topic.

      Selected Full-Text Journal Articles


        1. Geniospasm 1. OMIM (Online Mendelian Inheritance in Man). June 10, 2011; https://www.omim.org/entry/190100.
        2. Jarman PR, Wood NW, Davis MT, Davis PV, Bhatia KP, Marsden CD, Davis MB. Hereditary Geniospasm: Linkage to Chromosome 9q13-q21 and Evidence for Genetic Heterogeneity. Am. J. Hum. Genet. 1997; 61:928-933. https://www.pubmedcentral.nih.gov/picrender.fcgi?artid=1715984&blobtype=pdf.
        3. Hereditary geniospasm. Orphanet. April 2009; https://www.orpha.net/consor/cgi-bin/OC_Exp.php?lng=EN&Expert=53372. Accessed 6/5/2013.
        4. Devetag Chalaupka F, Bartholini F, Mandich G, Turro M. Two new families with hereditary essential chin myoclonus: clinical features, neurophysiological findings and treatment. Neurol Sci. June 2006; 27(2):97-103.

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