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

Myopathy with extrapyramidal signs



Other Names:
Proximal myopathy with extrapyramidal signs
Categories:

Myopathy with extrapyramidal signs is a disorder characterized by early childhood onset of proximal muscle weakness (muscles closest to the body’s midline) and learning disabilities. The muscle weakness does not progress, but most patients develop progressive atypical involuntary muscle contractions that influence gait, movement, and posture (extrapyramidal signs) that may be disabling. Signs and symptoms are variable and include brief, repetitive, jerky and uncontrolled movements caused by muscle contractions (chorea), tremor, abnormal posturing, and involuntary repetitive movements of the mouth and face.[1]  Other symptoms may include uncoordinated movements (ataxia), a very small head (microcephaly), drooping of the eyelids, wasting of the eye nerve (optic atrophy), and axonal peripheral neuropathy. It is caused by changes (mutations) in the MICU1 gene and is inherited in an autosomal recessive  pattern.[1][2]
Last updated: 3/31/2016

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
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HPO ID
30%-79% of people have these symptoms
Abnormal basal ganglia MRI signal intensity 0012751
Central core regions in muscle fibers 0030230
Centrally nucleated skeletal muscle fibers 0003687
Chorea 0002072
Difficulty running 0009046
Difficulty walking
Difficulty in walking
0002355
Dystonia 0001332
Global developmental delay 0001263
Increased variability in muscle fiber diameter 0003557
Orofacial dyskinesia 0002310
Progressive extrapyramidal movement disorder 0007153
Progressive extrapyramidal muscular rigidity 0007158
Proximal muscle weakness
Weakness in muscles of upper arms and upper legs
0003701
Resting tremor
Tremor at rest
0002322
5%-29% of people have these symptoms
Ataxia 0001251
Microcephaly
Abnormally small skull
Decreased circumference of cranium
Decreased size of skull
Reduced head circumference
Small head circumference
[ more ]
0000252
Mildly elevated creatine kinase 0008180
Ophthalmoplegia
Eye muscle paralysis
0000602
Optic atrophy 0000648
Peripheral axonal neuropathy 0003477
Ptosis
Drooping upper eyelid
0000508
1%-4% of people have these symptoms
Abnormality of extrapyramidal motor function 0002071
Specific learning disability 0001328
Tremor 0001337
Percent of people who have these symptoms is not available through HPO
Autosomal recessive inheritance 0000007
Elevated serum creatine kinase
Elevated blood creatine phosphokinase
Elevated circulating creatine phosphokinase
Elevated creatine kinase
Elevated serum CPK
Elevated serum creatine phosphokinase
High serum creatine kinase
Increased CPK
Increased creatine kinase
Increased creatine phosphokinase
Increased serum CK
Increased serum creatine kinase
Increased serum creatine phosphokinase
[ more ]
0003236
Motor delay 0001270
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Last updated: 7/1/2020

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


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

  • 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.

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  1. Logan CV & cols. Loss-of-function mutations in MICU1 cause a brain and muscle disorder linked to primary alterations in mitochondrial calcium signaling. Nat Genet. February, 2014; 46(2):188-93. http://www.nature.com/ng/journal/v46/n2/full/ng.2851.html.
  2. Myopathy with extrapyramidal signs. OMIM. 2014; http://omim.org/entry/615673.