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Living with Congenital cerebellar ataxia due to RNU12 mutation

A rare inherited balance and coordination condition starting in infancy with delayed motor skills and unsteady walking.

Understanding Congenital cerebellar ataxia due to RNU12 mutation

Congenital cerebellar ataxia due to RNU12 mutation is a rare inherited condition that affects balance and coordination from infancy.

Infants have delayed motor milestones, low muscle tone, an unsteady walk, tremor with purposeful movement, shaky eye movements and slurred speech. Some have learning difficulties. Brain scans show a small and shrinking cerebellum.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Delayed motor milestones
  • Unsteady, wide-based walk (gait ataxia)
  • Frequent falls
  • Tremor with purposeful movement
  • Slurred speech (dysarthria)
  • Low muscle tone in the trunk

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include brain and nervous system specialists and genetic specialists.

  3. Consider genetic testing

    Changes in RNU12 are linked to this condition. Genetic testing and counseling can help confirm a diagnosis and explain what it means for your family.

  4. Connect with expert centers

    National Ataxia Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Genetic specialists (geneticists)
Expert care
Expert lists: National Ataxia Foundation
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with National Ataxia Foundation
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
Should we have genetic testing for the RNU12 gene?
What therapy can help with balance and coordination?
How can we help with speech and learning?

Quick facts

Symptoms usually startInfant
InheritanceAutosomal Recessive
GenesRNU12

Changes in the RNU12 gene are listed. It is autosomal recessive, so a child inherits a changed copy from each parent.

GeneticNeurological

Also known as: congenital cerebellar ataxia due to rna, u12 small nuclear mutation

Patient organizations

Broader rare-disease groups

Source: NIH GARD · Congenital cerebellar ataxia due to RNU12 mutationGARD ID 22075 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Congenital cerebellar ataxia due to RNU12 mutation.

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