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Living with SLC39A8-CDG

A rare genetic metabolic condition starting in infancy that affects development, muscle tone and the brain.

Understanding SLC39A8-CDG

SLC39A8-CDG is a rare genetic metabolic condition that affects glycosylation, the body's way of attaching sugars to proteins.

This makes it harder for proteins to do their jobs. Symptoms include delayed development, severe intellectual disability and low muscle tone. People may have short stature, seizures, crossed eyes, repeated infections and thin bones. Lab tests may show low zinc and manganese. Parts of the brain can shrink over time. It starts in the newborn period.

Signs & symptoms

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

  • Profound developmental delay
  • Severely low muscle tone
  • Seizures
  • Crossed eyes (strabismus)
  • Short stature
  • Poor head control

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 SLC39A8 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

    CDG CARE 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: CDG CARE
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 CDG CARE 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 SLC39A8 gene confirm this diagnosis?
Should zinc and manganese levels be checked?
How should seizures and bone health be managed?

Quick facts

Symptoms usually startNewborn
InheritanceAutosomal Recessive
GenesSLC39A8

GARD lists changes in the SLC39A8 gene. A child inherits a changed copy of the gene from each parent (autosomal recessive).

GeneticNeurologicalInherited Metabolic

Also known as: carbohydrate deficient glycoprotein syndrome type iin; cdg iin; cdg syndrome type iin; cdg-iin; cdg2n; congenital disorder of glycosylation type 2n

Patient organizations

Source: NIH GARD · SLC39A8-CDGGARD ID 17846 · 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 SLC39A8-CDG.

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Explore research for SLC39A8-CDG

Explore actively recruiting SLC39A8-CDG studies with HealthSpark.

HealthSpark

Find actively recruiting studies for SLC39A8-CDG with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
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  • Eligibility is confirmed by the study team

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Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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