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Living with Sideroblastic anemia 3

A very rare genetic form of anemia described in one adult, with small red blood cells and extra iron in the liver.

Understanding Sideroblastic anemia 3

Sideroblastic anemia 3 is a very rare inherited anemia that does not improve with vitamin B6 (pyridoxine).

It is linked to a change in the GLRX5 gene. GARD describes it in a single patient who developed anemia as an adult, with small, pale red blood cells, extra iron in the liver and type 2 diabetes.

Signs & symptoms

GARD doesn't list specific symptoms for this condition yet. Based on its summary, features include:

  • Anemia with small, pale red blood cells
  • Extra iron in the liver
  • Type 2 diabetes

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 blood and bone marrow specialists and genetic specialists.

  3. Consider genetic testing

    Changes in GLRX5 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
Blood and bone marrow specialists (hematologists); 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
Can genetic testing of the GLRX5 gene confirm this diagnosis?
How should iron in my liver be monitored?
How should diabetes be checked and managed?

Quick facts

Symptoms usually startAdult
InheritanceAutosomal Recessive, Mitochondrial
GenesGLRX5

GARD lists a splice change in the GLRX5 gene. A child inherits a changed copy of the gene from each parent (autosomal recessive).

GeneticBloodInherited MetabolicMitochondrial

Also known as: adult-onset autosomal recessive sideroblastic anaemia; adult-onset autosomal recessive sideroblastic anemia; anemia, sideroblastic, 3, pyridoxine-refractory; glrx5-related sideroblastic anaemia; glrx5-related sideroblastic anemia; sidba3

Patient organizations

Source: NIH GARD · Sideroblastic anemia 3GARD ID 17235 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

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