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Synonyms: CDG syndrome type Id | CDG-Id | CDG1D | Carbohydrate deficient glycoprotein syndrome type Id | Congenital disorder of glycosylation type 1d | Congenital disorder of glycosylation type Id | Mannosyltransferase 6 deficiency

A form of congenital disorders of N-linked glycosylation characterized by severe neurological involvement including hypotonia developmental delay intellectual disability postnatal microcephaly and progressive brain and cerebellar atrophy. Epilepsy with hypsarrythmia is frequently reported. Additional features that may be observed include failure to thrive arthrogryposis multiplex congenita (AMC) vision impairment (optic atrophy iris coloboma) and facial dysmorphism (hypertelorism with a broad nasal bridge large and thick ears thin lips micrognathia). The disease is caused by loss of function mutations of the gene ALG3 (3q27.3).

Data from Orphanet are used to provide information on a disease's name, synonym(s), and overview.

Reference: Access aggregated data from Orphanet at Orphadata.

Orphadata: Free access data from Orphanet. © INSERM 1999. Available on http: // Data version September 2023.

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Advocacy Organizations

Portuguese Association for CDG

The APCDG aims to holistically support families affected by a CDG. Our mission based on the pillars of disease awareness, education, research and to subsequently, speed up the development of therapies that will significantly benefit patients and their family members. We believe that only by adopting a patient-centric approach we will find ways to improve their quality of life.


Our mission is to promote greater awareness and understanding of CDG & NGLY1-Deficiency, to provide information and support to families affected by CDG & NGLY1, and to advocate for and fund scientific research to advance the diagnosis and treatment of CDG & NGLY1-Deficiency.

Mississippi Metabolics Foundation

Mississippi Metabolics Foundation (MMF) was founded to raise awareness, educate, and provide support to those living or caring for someone with genetic metabolic disorders/inborn errors of metabolism (IEM).

Clinical Trials

For a list of clinical trials in this disease area, please click here.