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Living with MPDU1-congenital disorder of glycosylation

A rare inherited condition with developmental delay, seizures, slow growth, heart muscle disease, and scaly skin.

Understanding MPDU1-congenital disorder of glycosylation

MPDU1-congenital disorder of glycosylation (MPDU1-CDG) is a rare inherited condition that affects how the body adds sugar chains to proteins.

It is marked by delayed development, seizures, trouble gaining weight, heart muscle disease (cardiomyopathy), and skin changes that look like ichthyosis (dry, scaly skin). Signs are seen in the newborn period or infancy.

Signs & symptoms

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

  • Low muscle tone in infancy (floppy infant)
  • Severe intellectual disability

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, genetic specialists, seizure and epilepsy specialists and skin, hair, and nail specialists.

  3. Consider genetic testing

    Changes in MPDU1 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 and Epilepsy Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Genetic specialists (geneticists); Seizure and epilepsy specialists (epileptologist); Skin, hair, and nail specialists (dermatologists)
Expert care
Expert lists: CDG CARE, Epilepsy 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 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 for the MPDU1 gene confirm this diagnosis?
How should the heart, skin, and seizures be monitored?
What feeding and developmental supports are available?

Quick facts

Symptoms usually startNewborn and as an Infant
InheritanceAutosomal Recessive
GenesMPDU1

This condition is caused by changes in the MPDU1 gene. It is autosomal recessive, which means a child inherits a changed copy of the gene from each parent.

GeneticNeurologicalSkinInherited Metabolic

Also known as: carbohydrate deficient glycoprotein syndrome type if; cdg if; cdg syndrome type if; cdg-if; cdg1f; cdgif

Patient organizations

Source: NIH GARD · MPDU1-congenital disorder of glycosylationGARD ID 9832 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

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