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. 2002 Oct 1;367(Pt 1):195–201. doi: 10.1042/BJ20020794

Deficiency of dolichyl-P-Man:Man7GlcNAc2-PP-dolichyl mannosyltransferase causes congenital disorder of glycosylation type Ig.

Christian Thiel 1, Markus Schwarz 1, Martin Hasilik 1, Ulrike Grieben 1, Folker Hanefeld 1, Ludwig Lehle 1, Kurt von Figura 1, Christian Körner 1
PMCID: PMC1222867  PMID: 12093361

Abstract

Deficiency of the endoplasmic reticulum enzyme dolichyl-phosphate mannose (Dol-P-Man):Man(7)GlcNAc(2)-PP-dolichyl mannosyltransferase leads to a new type of congenital disorder of glycosylation, designated type Ig. The patient 1 presented with a multisystemic disorder with microcephaly, developmental retardation, convulsions and dysmorphic signs. The isoelectric focusing pattern of the patient's serum transferrin showed the partial loss of complete N-glycan side chains. In skin fibroblasts from the patient, the activity of Dol-P-Man:Man(7)GlcNAc(2)-PP-Dol mannosyltransferase was severely reduced leading to the accumulation of Man(7)GlcNAc(2)-PP-Dol, which was transferred to newly synthesized glycoproteins. Sequencing of the Dol-P-Man:Man(7)GlcNAc(2)-PP-Dol mannosyltransferase cDNA revealed a compound heterozygosity for two point mutations, leading to the exchange of leucine(158) for a proline residue and a premature translation stop with loss of the C-terminal 74 amino acids. The parents were heterozygous for one of the two mutations. Retroviral expression of the wild-type Dol-P-Man:Man(7)GlcNAc(2)-PP-Dol mannosyltransferase cDNA in patient's fibroblasts normalized the mannosyltransferase activity.

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Selected References

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