Abstract
Leukocyte adhesion deficiency type II is an autosomal recessive syndrome characterized by generalized reduction of l-fucose in glycoconjugates; the specific molecular defect is still undefined. The most important clinical symptoms include severe growth and mental retardation and severe immunodeficiency. Patients from two ethnic groups have been reported, i.e. Arab and Turkish. We have observed that GDP-l-fucose transport into Golgi vesicles was specifically impaired in an Arab patient, with a significant reduction of the Vmax but no significant differences in the Km from control and parents. GDP-l-fucose transport showed simple saturation kinetics in all samples. Transport of UDP-galactose, UDP-N-acetylglucosamine, and CMP-sialic acid was comparable into vesicles from the Arab patient, parents, and control. These kinetic parameters probably account for the failure to obtain any clinical and biochemical response to fucose therapy in Arab patients. This contrasts both with the distinctive kinetic properties of GDP-l-fucose transport and with the success of fucose therapy, which have been recently reported in one patient of Turkish origin. Accordingly, the biochemical properties of GDP-l-fucose transport into the Golgi are consistent with different variants of leukocyte adhesion deficiency type II that are probably the result of different molecular defects.
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Abbreviations
- LAD II:
-
leukocyte adhesion deficiency type II
- GMD:
-
GDP-d-mannose 4,6-dehydratase (EC 4.2.1.47)
- BCA:
-
bicinchohinic acid
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Supported in part by the Italian Ministry of Scientific Research (MURST-PRIN 98, Programma di Settore Legge 95/95 “Biomolecole per la salute umana”) (A.D.F.), by CNR Target Project “Biotechnology” (M.T), and by NIH Grant R37 GM30365 (C.B.H.). M.T. and A.E. are also funded by a Joint Research Project between CNR (Italy) and MOSA (Israel).
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Sturla, L., Puglielli, L., Tonetti, M. et al. Impairment of the Golgi GDP-l-Fucose Transport and Unresponsiveness to Fucose Replacement Therapy in LAD II Patients. Pediatr Res 49, 537–542 (2001). https://doi.org/10.1203/00006450-200104000-00016
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DOI: https://doi.org/10.1203/00006450-200104000-00016
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