National Center for Advancing and Translational Sciences Genetic and Rare Diseases Information Center, a program of the National Center for Advancing and Translational Sciences

Spinocerebellar ataxia 25



Other Names:
SCA25; Spinocerebellar ataxia type 25
Categories:
This disease is grouped under:

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

Orpha Number: 101111

Definition
Spinocerebellar ataxia type 25 (SCA25) is a very rare subtype of type I autosomal dominant cerebellar ataxia (ADCA type I; see this term). It is characterized by cerebellar ataxia and prominent sensory neuropathy.

Epidemiology
Fewer than 10 cases in a 4-generation French family have been reported to date.

Clinical description
Age of onset ranges from 1 to 39 years. The clinical features vary widely from sensory neuropathy with little cerebellar ataxia to cerebellar ataxia with little sensory neuropathy. Some patients exhibit gastrointestinal (GI) disorders such as vomiting and abdominal pain as initial symptoms. GI problems can persist. Scoliosis and urinary problems (nycturia or urinary urgency) are also observed. Head magnetic resonance imaging (MRI) shows severe global cerebellar atrophy like in SCA5 and SCA6 (see these terms).

Etiology
SCA25 maps to chromosome 2p15-p21. Repeat expansion detection failed to identify CAG repeat expansion.

Prognosis
There is insufficient clinical data to draw conclusions concerning prognosis.

Visit the Orphanet disease page for more resources.
Last updated: 5/1/2011

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
Progressive cerebellar ataxia 0002073
30%-79% of people have these symptoms
Abnormal morphology of the cerebellar cortex 0031422
Areflexia of lower limbs 0002522
Babinski sign 0003487
Decreased number of large peripheral myelinated nerve fibers 0003387
Diffuse cerebellar atrophy 0100275
EMG: neuropathic changes 0003445
Facial tics
Cramping of facial muscles
Facial spasms
Jerking of facial muscles
Mimic spasms
Spasms of facial muscles
Twitching of facial muscles
[ more ]
0011468
Gait ataxia
Inability to coordinate movements when walking
0002066
Impaired distal tactile sensation
Decreased touch sensation in extremities
0006937
Impaired pain sensation
Decreased pain sensation
0007328
Nystagmus
Involuntary, rapid, rhythmic eye movements
0000639
Pes cavus
High-arched foot
0001761
Reduced visual acuity
Decreased clarity of vision
0007663
Scoliosis 0002650
Sensory neuropathy
Damage to nerves that sense feeling
0000763
Spastic dysarthria 0002464
Strabismus
Cross-eyed
Squint
Squint eyes
[ more ]
0000486
Urinary urgency
Overactive bladder
0000012
5%-29% of people have these symptoms
Episodic abdominal pain 0002574
Facial myokymia
Involuntary facial quivering
0000317
Vomiting
Throwing up
0002013
Percent of people who have these symptoms is not available through HPO
Abolished vibration sense 0006944
Ataxia 0001251
Autosomal dominant inheritance 0000006
Cerebellar atrophy
Degeneration of cerebellum
0001272
Decreased number of peripheral myelinated nerve fibers 0003380
Dysarthria
Difficulty articulating speech
0001260
Visual impairment
Impaired vision
Loss of eyesight
Poor vision
[ more ]
0000505
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Last updated: 7/1/2020

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


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


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.

Clinical Research Resources

  • The Centers for Mendelian Genomics program is working to discover the causes of rare genetic disorders. For more information about applying to the research study, please visit their website.

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


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


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

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 Spinocerebellar ataxia 25. Click on the link to view a sample search on this topic.

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