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Living with COG1 congenital disorder of glycosylation

An extremely rare condition with a small head, slow growth, developmental delay, and facial differences.

Understanding COG1 congenital disorder of glycosylation

COG1 congenital disorder of glycosylation (COG1-CDG) is an extremely rare form of CDG syndrome.

In the few cases reported, signs varied. They included a small head, slow growth, delayed development, and facial differences. GARD lists onset in the newborn period and infancy.

Signs & symptoms

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

  • Small head size
  • Slow growth
  • Delayed development
  • Facial differences
  • Club feet
  • Underdeveloped cerebellar vermis

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, brain and nervous system specialists and genetic specialists.

  3. Consider genetic testing

    Changes in COG1 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
Bone and joint specialists (orthopedists or orthopedic surgeons); 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
  • 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 COG1 genetic testing confirm the diagnosis?
Which specialists should follow growth, development, and the brain?
What therapies can support development?

Quick facts

Symptoms usually startNewborn and as an Infant
InheritanceAutosomal Recessive
GenesCOG1

GARD says changes in the COG1 gene cause this condition. It is autosomal recessive, so a child inherits a changed copy of the gene from each parent.

GeneticNeurologicalInherited Metabolic

Also known as: carbohydrate deficient glycoprotein syndrome type 2g; carbohydrate deficient glycoprotein syndrome type iig; cdg iig; cdg syndrome type iig; cdg-iig; cdg2g

Patient organizations

  • CDG CARECOG1 congenital disorder of glycosylation · United States
Source: NIH GARD · COG1 congenital disorder of glycosylationGARD ID 10226 · 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 COG1 congenital disorder of glycosylation.

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