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Living with ALG8 congenital disorder of glycosylation

A rare inherited condition with digestive problems, fluid buildup, liver and kidney effects, and nervous system symptoms.

Understanding ALG8 congenital disorder of glycosylation

ALG8 congenital disorder of glycosylation is a rare form of congenital disorder of N-linked glycosylation affecting many body systems.

It involves digestive symptoms (diarrhea, vomiting, feeding problems, and loss of protein through the intestine), fluid buildup, an enlarged liver, kidney tube problems, and clotting problems from low platelets. It also affects the brain, with delayed development, seizures, and balance problems. Cataracts and low muscle tone may occur. It starts during pregnancy, at birth, or in infancy.

Signs & symptoms

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

  • Diarrhea and vomiting
  • Trouble feeding and poor weight gain
  • Fluid buildup in the belly (ascites)
  • Blood clotting problems
  • Cloudy lens of the eye (cataract)
  • Seizures and developmental delay

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, digestive system specialists, eye disease specialists and genetic specialists.

  3. Consider genetic testing

    Changes in ALG8 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); Digestive system specialists (gastroenterologists); Eye disease specialists (ophthalmologists); 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
Is genetic testing for ALG8 available for our family?
How can feeding and digestive problems be managed?
How should blood clotting and platelet levels be monitored?

Quick facts

Symptoms usually startduring Pregnancy, at Birth, and as an Infant
InheritanceAutosomal Recessive
GenesALG8

Changes in the ALG8 gene cause this condition, in a way that stops the gene from working (loss of function). A child inherits a changed copy of the gene from each parent (autosomal recessive).

GeneticNeurologicalKidneyGastrointestinalInherited Metabolic

Also known as: alg8-cdg; alg8-cdg - asparagine-linked glycosylation 8 congenital disorder of glycosylation; alg8-cdg (cdg-ih); alg8-congenital disorder of glycosylation; asparagine-linked glycosylation 8 congenital disorder of glycosylation; carbohydrate deficient glycoprotein syndrome type ih

Patient organizations

Source: NIH GARD · ALG8 congenital disorder of glycosylationGARD ID 9834 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

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