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.
journal_name
J Neuroljournal_title
Journal of neurologyauthors
Vermeer S,Kremer HP,Leijten QH,Scheffer H,Matthijs G,Wevers RA,Knoers NA,Morava E,Lefeber DJdoi
10.1007/s00415-007-0546-3subject
Has Abstractpub_date
2007-10-01 00:00:00pages
1356-8issue
10eissn
0340-5354issn
1432-1459journal_volume
254pub_type
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