Spinocerebellar ataxia 17

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Other Names:

SCA 17; Spinocerebellar ataxia type 17

Categories:

Congenital and Genetic Diseases; Nervous System Diseases

This disease is grouped under:

Hereditary ataxia; Spinocerebellar ataxia

Summary Summary

The following summary is from Orphanet, a European reference portal for information on rare diseases and orphan drugs.

Orpha Number: 98759

Definition

Spinocerebellar ataxia type 17 (SCA17) is a rare subtype of type I autosomal dominant cerebellar ataxia (ADCA type I; see this term). It is characterized by a variable clinical picture which can include dementia, psychiatric disorders, parkinsonism, dystonia, chorea, spasticity, and epilepsy.

Epidemiology

Worldwide prevalence is unknown. Local prevalence is 0.47 per 1,000,000 in the Japanese population and 0.16 per 100,000 in North-East England. Fewer than 100 families have been reported to date.

Clinical description

Clinical features overlap with many neurodegenerative syndromes and specifically, Huntington disease (see this term).

Etiology

SCA17 is caused by a CAG repeat expansion in the TATA box-binding protein gene TBP (6q27).

Prognosis

Prognosis is poor. More than 60% of patients present with dysphagia which frequently results in aspiration and death. Mean disease duration is less than 18 years and a few patients live beyond 60 years of age.

Visit the Orphanet disease page for more resources.

Last updated: 5/1/2011

Symptoms Symptoms

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.

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Medical Terms	Other Names	Learn More: HPO ID
80%-99% of people have these symptoms
Ataxia		0001251
Gait disturbance	Abnormal gait Abnormal walk Impaired gait [ more ]	0001288
30%-79% of people have these symptoms
Abnormal pyramidal sign		0007256
Atrophy/Degeneration affecting the brainstem		0007366
Behavioral abnormality	Behavioral changes Behavioral disorders Behavioral disturbances Behavioral problems Behavioral/psychiatric abnormalities Behavioural/Psychiatric abnormality Psychiatric disorders Psychiatric disturbances [ more ]	0000708
Blepharospasm	Eyelid spasm Eyelid twitching Involuntary closure of eyelid Spontaneous closure of eyelid [ more ]	0000643
Cerebellar Purkinje layer atrophy		0012082
Chorea		0002072
Generalized cerebral atrophy/hypoplasia	Generalized cerebral degeneration/underdevelopment	0007058
Mental deterioration	Cognitive decline Cognitive decline, progressive Intellectual deterioration Progressive cognitive decline [ more ]	0001268
Neuronal loss in central nervous system	Loss of brain cells	0002529
Parkinsonism		0001300
Rigidity	Muscle rigidity	0002063
Spasticity	Involuntary muscle stiffness, contraction, or spasm	0001257
Torticollis	Wry neck	0000473
Writer's cramp		0002356
Percent of people who have these symptoms is not available through HPO
Aggressive behavior	Aggression Aggressive behaviour Aggressiveness [ more ]	0000718
Apraxia		0002186
Autosomal dominant inheritance		0000006
Bradykinesia	Slow movements Slowness of movements [ more ]	0002067
Broad-based gait	Wide based walk	0002136
Cerebellar atrophy	Degeneration of cerebellum	0001272
Confusion	Disorientation Easily confused Mental disorientation [ more ]	0001289
Depressivity	Depression	0000716
Diffuse cerebral atrophy		0002506
Dysarthria	Difficulty articulating speech	0001260
Dysmetria	Lack of coordination of movement	0001310
Dysphagia	Poor swallowing Swallowing difficulties Swallowing difficulty [ more ]	0002015
Dystonia		0001332
Frontal lobe dementia		0000727
Frontal release signs		0000743
Gait ataxia	Inability to coordinate movements when walking	0002066
Gaze-evoked nystagmus		0000640
Gliosis		0002171
Hallucinations	Hallucination Sensory hallucination [ more ]	0000738
Impaired pursuit initiation and maintenance		0007668
Intention tremor		0002080
Lack of insight		0000757
Limb ataxia		0002070
Mutism	Inability to speak Muteness [ more ]	0002300
Myoclonus		0001336
Paranoia		0011999
Positive Romberg sign		0002403
Progressive	Worsens with time	0003676
Seizure		0001250
Urinary incontinence	Loss of bladder control	0000020

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Do you have more information about symptoms of this disease? We want to hear from you.

Last updated: 1/1/2021

Do you have updated information on this disease? We want to hear from you.

Diagnosis Diagnosis

Making a diagnosis for a genetic or rare disease can often be challenging. Healthcare professionals typically look at a person’s medical history, symptoms, physical exam, and laboratory test results in order to make a diagnosis. The following resources provide information relating to diagnosis and testing for this condition. If you have questions about getting a diagnosis, you should contact a healthcare professional.

Testing Resources

The Genetic Testing Registry (GTR) provides information about the genetic tests for this condition. The intended audience for the GTR is health care providers and researchers. Patients and consumers with specific questions about a genetic test should contact a health care provider or a genetics professional.
Spinocerebellar Ataxia: Making an Informed Choice about Genetic Testing is a booklet providing information about spinocerebellar ataxia and is available as a PDF document on the University of Washington Medical Center Web site. Click on the title above to view this resource.

Find a Specialist Find a Specialist

If you need medical advice, you can look for doctors or other healthcare professionals who have experience with this disease. You may find these specialists through advocacy organizations, clinical trials, or articles published in medical journals. You may also want to contact a university or tertiary medical center in your area, because these centers tend to see more complex cases and have the latest technology and treatments.

If you can’t find a specialist in your local area, try contacting national or international specialists. They may be able to refer you to someone they know through conferences or research efforts. Some specialists may be willing to consult with you or your local doctors over the phone or by email if you can't travel to them for care.

You can find more tips in our guide, How to Find a Disease Specialist. We also encourage you to explore the rest of this page to find resources that can help you find specialists.

Healthcare Resources

To find a medical professional who specializes in genetics, you can ask your doctor for a referral or you can search for one yourself. Online directories are provided by the American College of Medical Genetics and the National Society of Genetic Counselors. If you need additional help, contact a GARD Information Specialist. You can also learn more about genetic consultations from Genetics Home Reference.
The National Ataxia Foundation, a nonprofit organization dedicated to improving the lives of persons affected by ataxia, provides lists of neurologists, ataxia clinics, and movement disorder clinics.

Research Research

Research helps us better understand diseases and can lead to advances in diagnosis and treatment. This section provides resources to help you learn about medical research and ways to get involved.

Patient Registry

Coordination of Rare Diseases at Sanford (CoRDS) hosts a specific registry for patients with ataxia in partnership with the National Ataxia Foundation. The goal of the CoRDS registry is to connect as many patients and researchers as possible to help advance treatments and cures for rare diseases. The CoRDS registry is free for patients to enroll and for researchers to access.

Organizations Organizations

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

Ataxia UK
12 Broadbent Close
London, N6 5JW United Kingdom
Toll-free: 0845 644 0606 (Helpline)
Telephone: 020 7582 1444
E-mail: helpline@ataxia.org.uk
Website: https://www.ataxia.org.uk/
National Ataxia Foundation
600 Highway 169 South
Suite 1725
Minneapolis, MN 55426
Telephone: +1-763-553-0020
Fax: +1-763-553-0167
E-mail: naf@ataxia.org
Website: https://ataxia.org/

Do you know of an organization? We want to hear from you.

Living With Living With

Living with a genetic or rare disease can impact the daily lives of patients and families. These resources can help families navigate various aspects of living with a rare disease.

Financial Resources

The Social Security Administration has included this condition in their Compassionate Allowances Initiative. This initiative speeds up the processing of disability claims for applicants with certain medical conditions that cause severe disability. More information about Compassionate Allowances and applying for Social Security disability is available online.

Learn More Learn More

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.

Where to Start

The National Center for Biotechnology Information (NCBI) was established in 1988 as a national resource for molecular biology information. Click on the link to view information on this topic.

In-Depth Information

GeneReviews provides current, expert-authored, peer-reviewed, full-text articles describing the application of genetic testing to the diagnosis, management, and genetic counseling of patients with specific inherited conditions.
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 Spinocerebellar ataxia 17. Click on the link to view a sample search on this topic.

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