Journal of Neurology

, 254:1356

Cerebellar ataxia and congenital disorder of glycosylation Ia (CDG-Ia) with normal routine CDG screening

  • S. Vermeer
  • H. P. H. Kremer
  • Q. H. Leijten
  • H. Scheffer
  • G. Matthijs
  • R. A. Wevers
  • N. A. V. M. Knoers
  • E. Morava
  • D. J. Lefeber
ORIGINAL COMMUNICATION

DOI: 10.1007/s00415-007-0546-3

Cite this article as:
Vermeer, S., Kremer, H.P.H., Leijten, Q.H. et al. J Neurol (2007) 254: 1356. doi:10.1007/s00415-007-0546-3

Abstract

Cerebellar ataxia can have many genetic causes among which are the congenital disorders of glycosylation type I (CDG-I). In this group of disorders, a multisystem phenotype is generally observed including the involvement of many organs, the endocrine, hematologic and central nervous systems. A few cases of CDG-Ia have been reported with a milder presentation, namely cerebellar hypoplasia as an isolated abnormality. To identify patients with a glycosylation disorder, isofocusing of plasma transferrin is routinely performed. Here, we describe two CDG-Ia patients,who presented with mainly ataxia and cerebellar hypoplasia and with a normal or only slightly abnormal transferrin isofocusing result. Surprisingly, the activity of the corresponding enzyme phosphomannomutase was clearly deficient in both leucocytes and fibroblasts. Therefore, in patients presenting with apparently recessive inherited ataxia caused by cerebellar hypoplasia and an unknown genetic aetiology after proper diagnostic work-up, we recommend the measurement of phosphomannomutase activity when transferrin isofocusing is normal or inconclusive.

Key words

cerebellar ataxia transferrin isofocusing CDG-Ia phosphomannomutase 

Copyright information

© Steinkopff-Verlag 2007

Authors and Affiliations

  • S. Vermeer
    • 1
  • H. P. H. Kremer
    • 2
  • Q. H. Leijten
    • 3
  • H. Scheffer
    • 1
  • G. Matthijs
    • 4
  • R. A. Wevers
    • 2
    • 5
  • N. A. V. M. Knoers
    • 1
  • E. Morava
    • 5
  • D. J. Lefeber
    • 2
    • 5
    • 6
  1. 1.Dept. of Human GeneticsRadboud University, Nijmegen Medical CentreNijmegenThe Netherlands
  2. 2.Dept. of NeurologyRadboud University, Nijmegen Medical CentreNijmegenThe Netherlands
  3. 3.Dept. of NeurologyRijnstate HospitalArnhemThe Netherlands
  4. 4.Centre for Human GeneticsUniversity HospitalLeuvenBelgium
  5. 5.Dept. of PediatricsRadboud University, Nijmegen Medical CentreNijmegenThe Netherlands
  6. 6.Radboud University, Nijmegen Medical CenterLaboratory of Pediatrics and Neurology (656)NijmegenThe Netherlands

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