Inherited metabolic disorders
Mucolipidosis II alpha/beta
Mucolipidosis II alpha/beta is a GNPTAB-related disorder that disrupts the delivery of several enzymes to lysosomes. It can cause severe skeletal, growth, cardiac and respiratory problems beginning very early in life.
Other names and abbreviations
ML II · MLII · GNPTAB-related mucolipidosis II · I-cell disease · Mucolipidosis type II · Inclusion-cell disease
Where transplant fits
Allogeneic transplantation has been reported, but it has not established a predictable survival or developmental benefit and is not routine treatment. It should not be presented as a proven way to correct the disorder throughout the body.
Treatment depends on the exact diagnosis, disease stage, prior treatment and the person’s health. These categories are not estimates of donor demand.
Treatment at a glance
- Who it affects
- Features are often present at or near birth. This severe form differs from mucolipidosis III and intermediate GNPTAB-related disease.
- Other treatment options
- Care is mainly supportive, addressing breathing, heart disease, feeding, mobility, development and comfort, with specialist attention to anesthesia and airway risk.
- Cells used for transplantation
- Donor grafts have been reported in exceptional treatment; no routine source or transplant pathway is established.
Why the details matter
Delivery of donor-derived enzymes does not guarantee correction of severe skeletal or multisystem disease. Evidence from other lysosomal disorders does not establish benefit here.
Questions to bring to your care team
What is the exact diagnosis or subtype? What is the goal of each treatment option? If transplant is being considered, why does it fit this situation, which cells would be used and what are the alternatives?
Sources and further reading
- GNPTAB-Related Disorders
GeneReviews, University of Washington / NCBI Bookshelf · Accessed 2026-09-05 - Inborn Errors of Metabolism and Osteopetrosis
EBMT Handbook · 2024-04-11
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