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GM1 gangliosidosis type 1

Synonym(s) Infantile GM1 gangliosidosis
Norman-Landing disease
Prevalence Unknown
Inheritance Autosomal recessive
Age of onset Infancy
  • E75.1
MeSH -
MedDRA -


Disease definition

GM1 gangliosidosis type 1 is the severe infantile form of GM1 gangliosidosis (see this term) with variable neurological and systemic manifestations.


Type 1 is the most frequent form of GM1 gangliosidosis but the exact prevalence is not known. About 200 cases have been reported to date. Overall prevalence at birth of GM1 gangliosidosis is estimated to be approximately 1:100,000 to 200,000 live births.

Clinical description

The onset of this disorder may be in utero (non immune hydrops fetalis) or by the age of six months. Clinical signs are variable and include arrest/regression of neurological development, hypotonia, visceromegaly, macular cherry-red spots, dysostosis and coarse facial features. Cardiomyopathy may occur.


GM1 gangliosidosis is caused by mutations in the GLB1 gene (3p22.3) coding for beta-galactosidase.

Diagnostic methods

Diagnosis is based on clinical signs although classic signs are not always present at diagnosis. Biochemical and/or molecular genetic tests confirm the diagnosis.

Differential diagnosis

Differential diagnosis includes mucopolysaccharidoses, sphingolipidoses and oligosaccharidoses (see these terms).

Antenatal diagnosis

Prenatal diagnosis can be performed by analysis of beta-galactosidase activity and/or by GLB1 molecular analysis in either chorionic villus (CV) cells or amniotic fluid cells if mutations are found in an index case.

Genetic counseling

GM1 gangliosidosis is an autosomal recessive disease. Genetic counseling should be provided to affected families.

Management and treatment

Treatment for patients with GM1 gangliosidosis is symptomatic and supportive.


Prognosis is very poor with life-expectancy rarely exceeding 2 years. Causes of death include pneumonia due to recurrent aspiration and cardiopulmonary failure.

Expert reviewer(s)

  • Dr Anna CACIOTTI
  • Dr Maria Alice DONATI
  • Dr Amelia MORRONE

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Detailed information

Clinical genetics review
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