National Center for Advancing and Translational Sciences Genetic and Rare Diseases Information Center, a program of the National Center for Advancing and Translational Sciences

ALG6-CDG (CDG-Ic)


Other Names:
CDG 1C; CDG1C; Carbohydrate-deficient glycoprotein syndrome type 1C; CDG 1C; CDG1C; Carbohydrate-deficient glycoprotein syndrome type 1C; Carbohydrate-deficient glycoprotein syndrome, type 1 with deficient glycosylation of dolichol-linked oligosaccharide (formerly); Carbohydrate-deficient glycoprotein syndrome, type V (formerly); CDGS5 (formerly); ALG6-CDG (CDG-Ic); CONGENITAL DISORDER OF GLYCOSYLATION, TYPE Ic; ALG6-CDG; Carbohydrate deficient glycoprotein syndrome type Ic; CDG syndrome type Ic; CDG-Ic; Congenital disorder of glycosylation type 1c; Congenital disorder of glycosylation type Ic; Glucosyltransferase 1 deficiency See More
Categories:
This disease is grouped under:
The following summary is from Orphanet, a European reference portal for information on rare diseases and orphan drugs.
orphanet

Orpha Number: 79320

Definition
A form of congenital disorders of N-linked glycosylation characterized by feeding problems, mild-to-moderate neurologic involvement with hypotonia, poor head control, developmental delay, ataxia, strabismus, and seizures, ranging from febrile convulsions to epilepsy. Retinal degeneration has also been reported. A minority of patients show other manifestations, particularly intestinal (such as protein-losing enteropathy) and liver involvement. The disease is caused by loss of function mutations of the gene ALG6 (1p31.3).

Visit the Orphanet disease page for more resources.
Last updated: 7/1/2016

This table lists symptoms that people with this disease may have. For most diseases, symptoms will vary from person to person. People with the same disease may not have all the symptoms listed. This information comes from a database called the Human Phenotype Ontology (HPO) . The HPO collects information on symptoms that have been described in medical resources. The HPO is updated regularly. Use the HPO ID to access more in-depth information about a symptom.

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Medical Terms Other Names
Learn More:
HPO ID
80%-99% of people have these symptoms
Global developmental delay 0001263
Muscular hypotonia
Low or weak muscle tone
0001252
30%-79% of people have these symptoms
Hepatic failure
Liver failure
0001399
Percent of people who have these symptoms is not available through HPO
Areflexia
Absent tendon reflexes
0001284
Ataxia 0001251
Autosomal recessive inheritance 0000007
Elevated serum transaminases during infections 0008150
Muscular hypotonia of the trunk
Low muscle tone in trunk
0008936
Psychomotor retardation 0025356
Reduced antithrombin III activity 0001976
Reduced factor XI activity 0001929
Seizure 0001250
Strabismus
Cross-eyed
Squint
Squint eyes
[ more ] 		0000486
Type I transferrin isoform profile 0003642
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Last updated: 7/1/2020

Making a diagnosis for a genetic or rare disease can often be challenging. Healthcare professionals typically look at a person’s medical history, symptoms, physical exam, and laboratory test results in order to make a diagnosis. The following resources provide information relating to diagnosis and testing for this condition. If you have questions about getting a diagnosis, you should contact a healthcare professional.

Testing Resources

  • The Genetic Testing Registry (GTR) provides information about the genetic tests for this condition. The intended audience for the GTR is health care providers and researchers. Patients and consumers with specific questions about a genetic test should contact a health care provider or a genetics professional.

If you need medical advice, you can look for doctors or other healthcare professionals who have experience with this disease. You may find these specialists through advocacy organizations, clinical trials, or articles published in medical journals. You may also want to contact a university or tertiary medical center in your area, because these centers tend to see more complex cases and have the latest technology and treatments.

If you can’t find a specialist in your local area, try contacting national or international specialists. They may be able to refer you to someone they know through conferences or research efforts. Some specialists may be willing to consult with you or your local doctors over the phone or by email if you can't travel to them for care.

You can find more tips in our guide, How to Find a Disease Specialist. We also encourage you to explore the rest of this page to find resources that can help you find specialists.

Healthcare Resources

Support and advocacy groups can help you connect with other patients and families, and they can provide valuable services. Many develop patient-centered information and are the driving force behind research for better treatments and possible cures. They can direct you to research, resources, and services. Many organizations also have experts who serve as medical advisors or provide lists of doctors/clinics. Visit the group’s website or contact them to learn about the services they offer. Inclusion on this list is not an endorsement by GARD.

Organizations Supporting this Disease

Social Networking Websites

  • RareConnect has an online community for patients and families with this condition so they can connect with others and share their experiences living with a rare disease. The project is a joint collaboration between EURORDIS (European Rare Disease Organisation) and NORD (National Organization for Rare Disorders).

These resources provide more information about this condition or associated symptoms. The in-depth resources contain medical and scientific language that may be hard to understand. You may want to review these resources with a medical professional.

Where to Start

In-Depth Information

  • GeneReviews provides current, expert-authored, peer-reviewed, full-text articles describing the application of genetic testing to the diagnosis, management, and genetic counseling of patients with specific inherited conditions.
  • The Monarch Initiative brings together data about this condition from humans and other species to help physicians and biomedical researchers. Monarch’s tools are designed to make it easier to compare the signs and symptoms (phenotypes) of different diseases and discover common features. This initiative is a collaboration between several academic institutions across the world and is funded by the National Institutes of Health. Visit the website to explore the biology of this condition.
  • Online Mendelian Inheritance in Man (OMIM) is a catalog of human genes and genetic disorders. Each entry has a summary of related medical articles. It is meant for health care professionals and researchers. OMIM is maintained by Johns Hopkins University School of Medicine. 
  • Orphanet is a European reference portal for information on rare diseases and orphan drugs. Access to this database is free of charge.
    Orphanet
    Orphanet
  • PubMed is a searchable database of medical literature and lists journal articles that discuss ALG6-CDG (CDG-Ic). Click on the link to view a sample search on this topic.

Questions sent to GARD may be posted here if the information could be helpful to others. We remove all identifying information when posting a question to protect your privacy. If you do not want your question posted, please let us know.