Skip to
  1. Homepage
  2. Rare diseases
  3. Search
Simple search

Simple search

(*) mandatory field


Other search option(s)


Synonym(s) Alpha-L-fucosidase deficiency
Prevalence <1 / 1 000 000
Inheritance Autosomal recessive
Age of onset Infancy
  • E77.1
  • C0016788
  • D005645
MedDRA -


Fucosidosis is a very rare lysosomal storage disorder belonging to the group of oligosaccharidoses or glycoproteinoses. Less than 100 cases have been documented (20 of them in Southern Italy). Clinical signs include facial dysmorphism, dysostosis multiplex, moderate hepatomegaly, severe intellectual deficit , deafness, and according to age, angiokeratomas. Every intermediate form exists, ranging from severe (type 1: onset between 3 and 18 months of age) to moderate (type 2, with a slower progression). It is caused by an alpha-L-fucosidase deficiency, responsible for generalized accumulation of fucose-containing glycolipids and oligosaccharides in body tissues. Transmission is autosomal recessive. The gene has been located on 1p36-p34 (FUCA 1 locus) and cloned, together with a pseudogene on chromosome 2. More than 20 mutations have been identified. Moreover, a polymorphic locus (FUCA 2) on chromosome 6 has been associated with control of enzymatic activity levels in serum and fibroblasts. Biological diagnosis is made by finding the typical chromatographic profile of urinary oligosaccharides. Results are confirmed by measuring the alpha-L-fucosidase activity in leucocytes. Some difficulties have been encounterd when measuring enzyme activity in ammniocytes and in the trophoblast. The only specific treatment is allogenic bone marrow transplantation, but less than 10 cases have been transplanted worldwide and it is too soon to assess the results.

Expert reviewer(s)

  • Dr Roseline FROISSART
  • Dr Irène MAIRE

(*) Required fields.

Attention: Only comments seeking to improve the quality and accuracy of information on the Orphanet website are accepted. For all other comments, please send your remarks via contact us. Only comments written in English can be processed.

Captcha image

Detailed information

Clinical practice guidelines
Get Acrobat Reader
The documents contained in this web site are presented for information purposes only. The material is in no way intended to replace professional medical care by a qualified specialist and should not be used as a basis for diagnosis or treatment.