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Living with Combined oxidative phosphorylation defect type 11

A rare genetic mitochondrial condition with low muscle tone, breathing problems and sometimes hearing, kidney or learning problems.

Understanding Combined oxidative phosphorylation defect type 11

Combined oxidative phosphorylation defect type 11 is a rare genetic condition in which the cell's energy-making parts (mitochondria) don't work well.

It varies a lot. Some babies have severe brain and muscle disease with acid build-up (lactic acidosis), weak reflexes, low muscle tone and breathing failure. Others have low muscle tone, developmental delay, hearing loss and kidney disease. Some have intellectual disability, seizures or heart muscle disease.

Signs & symptoms

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

  • Low muscle tone (hypotonia)
  • Weak reflexes
  • Lethargy
  • Kidney problems (renal insufficiency)
  • Breathing failure
  • Tongue twitching

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 RMND1 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

    United Mitochondrial Disease Foundation and MitoAction 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: United Mitochondrial Disease Foundation, MitoAction
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 United Mitochondrial Disease Foundation and other patient organizations
  • 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 RMND1 gene?
How should kidney, heart and hearing be monitored?
Which specialists should be on our care team?

Quick facts

Symptoms usually startNewborn and as an Infant
InheritanceAutosomal Recessive, Mitochondrial
GenesRMND1

Changes in the RMND1 gene are listed. GARD lists autosomal recessive and mitochondrial inheritance.

GeneticNeurologicalInherited MetabolicMitochondrial

Also known as: combined oxidative phosphorylation deficiency 11; combined oxidative phosphorylation deficiency caused by mutation in rmnd1; combined oxidative phosphorylation deficiency type 11; coxpd11; coxpd11 - combined oxidative phosphorylation defect type 11; encephaloneuromyopathy, infantile, due to mitochondrial translation defect

Patient organizations

Source: NIH GARD · Combined oxidative phosphorylation defect type 11GARD ID 17487 · 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 Combined oxidative phosphorylation defect type 11.

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