Biochemical and clinical response after umbilical cord blood transplant in a boy with early childhood-onset beta-mannosidosis

Troy C Lund, Weston P. Miller, Julie Eisengart, Katrina Simmons, Laura Pollard, Deborah L. Renaud, David A. Wenger, Marc C. Patterson, Paul J. Orchard

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Background: Deficiency in the enzyme β-mannosidase was described over three decades ago. Although rare in occurrence, the presentation of childhood-onset β-mannosidase deficiency consists of hypotonia in the newborn period followed by global development delay, behavior problems, and intellectual disability. No effective pharmacologic treatments have been available. Methods: We report 2-year outcomes following the first umbilical cord blood transplant in a 4-year-old boy with early childhood-onset disease. Results: We show restoration of leukocyte β-mannosidase activity which remained normal at 2 years posttransplant, and a simultaneous increase in plasma β-mannosidase activity and dramatic decrease in urine-free oligosaccharides were also observed. MRI of the brain remained stable. Neurocognitive evaluation revealed test point gains, although the magnitude of improvement was less than expected for age, causing lower IQ scores that represent a wider developmental gap between the patient and unaffected peers. Conclusion: Our findings suggest that hematopoietic cell transplant can correct the biochemical defect in β-mannosidosis, although preservation of the neurocognitive trajectory may be a challenge.

Original languageEnglish (US)
Article numbere00712
JournalMolecular Genetics and Genomic Medicine
Issue number7
StatePublished - Jul 2019

Bibliographical note

Publisher Copyright:
© 2019 The Authors. Molecular Genetics & Genomic Medicine published by Wiley Periodicals, Inc.


  • beta-mannosidase
  • beta-mannosidosis
  • storage disease
  • umbilical cord blood transplant


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