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A form of congenital disorders of N-linked glycosylation that is characterized by gastrointestinal symptoms (diarrhea, vomiting, feeding problems with failure to thrive, protein-losing enteropathy), edema and ascites (including hydrops fetalis), hepatomegaly, renal tubulopathy, coagulation anomalies due to thrombocytopenia, brain involvement (psychomotor delay, seizures, ataxia), facial dysmorphism (low-set ears and retrognathia), pes equinovarus, and muscular hypotonia. Cataracts may also be observed. Prognosis is usually poor. The disease is caused by loss-of-function mutations in the gene ALG8 (11q14.1), resulting in a block in the initial step of protein glycosylation.
Features include always present findings: Protein-losing enteropathy, Decreased circulating T4 concentration, Low muscle tone (hypotonia), and Enlarged liver (hepatomegaly) and others; and common findings: Cholestasis, Decreased liver function, Long philtrum, and Abdominal distention and others.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Digestive system | 7 | Cholestasis, Decreased liver function, Enlarged liver (hepatomegaly) |
ALG8 encodes ALG8 alpha-1,3-glucosyltransferase (526 aa). Dolichyl pyrophosphate Glc1Man9GlcNAc2 alpha-1,3-glucosyltransferase that operates in the biosynthetic pathway of dolichol-linked oligosaccharides, the glycan precursors employed in protein asparagine (N)-glycosylation. Highest expression in Testis (40.9 TPM) and Cells Cultured fibroblasts (28.9 TPM).
ALG8-congenital disorder of glycosylation is associated with mutations in the ALG8 gene on chromosome 11.
The ALG8 protein participates in Defective ALG8 causes CDG-1h, Regulation of CDH1 posttranslational processing and trafficking to plasma membrane, and Addition of a second glucose to the N-glycan precursor by ALG8 pathways.
ALG8 is classified as a druggable target (Enzyme category) with score 0.0.
Genetic testing for ALG8 is available. Testing is considered confirmatory for diagnosis.
Phenotype severity distribution: 15 always present features, 18 common features.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
No clinical trials have been registered for ALG8-congenital disorder of glycosylation.
2 publications have been identified in PubMed for ALG8-congenital disorder of glycosylation. Research spans Case Report / Case Series (100%).
Xia X (2026). [PMID: 42112992](https://pubmed.ncbi.nlm.nih.gov/42112992/). *J Craniofac Surg*. [Case Report / Case Series]
Huang Y (2025). [PMID: 39792033](https://pubmed.ncbi.nlm.nih.gov/39792033/). *QJM*. [Case Report / Case Series]
Data assembled from 6 of 12 sources · Last updated Sep 20, 2026, 5:09 PM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
Common questions about ALG8-congenital disorder of glycosylation
Growth and development | 2 | Failure to thrive, Intrauterine growth retardation |
Blood and immune system | 2 | Low red blood cell count (anemia), Low platelet count (thrombocytopenia) |
Muscles | 1 | Low muscle tone (hypotonia) |
Heart and blood vessels | 1 | Perimembranous ventricular septal defect |
Pregnancy and birth | 1 | Decreased fetal movement |
Hormones | 1 | Hypothyroidism |
Kidneys and urinary system | 1 | Elevated creatinine (kidney function marker) (elevated circulating creatinine concentration) |
Lab test results | 1 | Elevated creatinine (kidney function marker) (elevated circulating creatinine concentration) |
AI-curated news mentioning ALG8-congenital disorder of glycosylation
Updated Jul 21, 2026
FDA approved Casgevy CRISPR gene therapy for children as young as 2 with sickle cell disease on July 1, 2026. Here's what families need to know about this milestone. Approximately 5,500 additional American children are now eligible for this established one-time therapy, according to Vertex Pharmaceuticals, Casgevy's developer. Casgevy also covers transfusion-dependent beta-thalassemia in this new age indication. Sickle cell disease is a lifelong inherited blood disorder that warps red blood cells into stiff, crescent shapes that can block blood flow, starving organs and tissues of oxygen. The world's first CRISPR-based gene therapy has been approved for children as young as two years old, opening the possibility of a single, potentially curative treatment to thousands of American children with sickle cell disease before years of organ damage can narrow what medicine can do for them. Families with children aged 2 and older who have sickle cell disease should speak with their pediatric hematologist about whether Casgevy is appropriate to consider at this stage of their child's disease. Ask specifically which authorized treatment centers perform Casgevy in your region. Treatment is available only at specialized sites, and geographic access remains limited. Contact your child's insurance plan or Medicaid office to ask about coverage. Medicaid coverage for gene therapies varies by state, and some states have developed outcomes-based payment models for high-cost therapies. "With today's decision, pediatric patients as young as 2 years of age can now access a critical additional treatment option to treat these debilitating, life-threatening diseases," said Karim Mikhail, acting director of the Office of Therapeutic Products at the FDA's Center for Biologics Evaluation and Research, according to the FDA press announcement. Casgevy is a non-viral, ex vivo CRISPR/Cas9 gene-edited cell therapy.
A new treatment for children aged 2 or older with sickle cell disease has been approved by the U.S. Food & Drug Administration. In a press release on Wednesday, the FDA announced it had approved Casgevy, the first gene therapy for children with sickle cell disease. (NewsNation) — A new treatment for children aged 2 or older with sickle cell disease has been approved by the Food & Drug Administration (FDA). In a Wednesday news release, the FDA announced it had approved Casgevy, the first gene therapy for children with the disease. “Casgevy is a gene therapy consisting of the patient’s own (autologous) hematopoietic (blood) stem cells, administered as a one-time single dose for intravenous infusion,” the release noted. “Pediatric patients as young as 2 years of age can now access a critical additional treatment option to treat these debilitating, life-threatening diseases,” Karim Mikhail, the acting director of the Center for Biologics Evaluation and Research, wrote. “These disorders carry a heavy burden for children and their families, affecting growth, development, and long-term health in profound ways,” Megha Kaushal, acting deputy director of the Office of Therapeutic Products in CBER, said in the release.