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Living with Autosomal recessive osteopetrosis 6

An inherited bone condition that makes bones denser and prone to fractures, starting in childhood.

Understanding Autosomal recessive osteopetrosis 6

Autosomal recessive osteopetrosis 6 is an inherited bone condition in which bones become denser than usual and grow abnormally.

Osteopetrosis is a group of rare inherited bone disorders. Symptoms and severity vary a lot, from newborn onset to being found by chance on an X-ray. Features may include fractures, short height, nerve pressure, and low blood counts. Onset for this type is listed as childhood.

Signs & symptoms

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

  • Recurrent fractures
  • Back pain
  • Overall denser bones (osteosclerosis)
  • Flask-shaped thighbone ends
  • Denser bone at the base of the skull
  • Layered look of spine bones on X-ray

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 bone and joint specialists and genetic specialists.

  3. Consider genetic testing

    Changes in PLEKHM1 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

    Muscular Dystrophy Association may keep lists of experts for this condition.

Care & treatment

Care team
Bone and joint specialists (orthopedists or orthopedic surgeons); Genetic specialists (geneticists)
Expert care
Expert lists: Muscular Dystrophy Association
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 Muscular Dystrophy Association
  • 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
Can genetic testing for the PLEKHM1 gene confirm the diagnosis?
How can we lower the chance of fractures?
Which specialists should be on my care team?

Quick facts

Symptoms usually startChild
InheritanceAutosomal Recessive
GenesPLEKHM1

It is caused by changes in the PLEKHM1 gene. It is autosomal recessive, so a child inherits a changed copy of the gene from each parent.

Genetic

Also known as: autosomal recessive intermediate osteopetrosis; autosomal recessive osteopetrosis intermediate form; autosomal recessive osteopetrosis type 6; intermediate osteopetrosis; optb6; osteopetrosis (disease) caused by mutation in plekhm1

Patient organizations

Source: NIH GARD · Autosomal recessive osteopetrosis 6GARD ID 4156 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

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