期刊
GENETICS IN MEDICINE
卷 3, 期 6, 页码 393-398出版社
NATURE PUBLISHING GROUP
DOI: 10.1097/00125817-200111000-00003
关键词
congenital disorders of glycosylation; phosphomannomutase; genotype-phenotype; oligosaccharide
资金
- NIDDK NIH HHS [R01 DK55615] Funding Source: Medline
Purpose: Congenital disorders of glycosylation (CDG) result from mutations in N-glycan biosynthesis. Mutations in phosphomannomutase (PMM2) cause CDG-la. Here, we report four clinically mild patients and their mutations in PMM2. Methods: Analysis of the PMM2 cDNA and gene revealed the mutations affecting the glycosylation efficiency. Results: The patients have 30% to 50% normal PMM activity in fibroblasts due to different mutations in PMM2, and we studied the effect of each mutation on the PMM activity in a Saccharomyces cerevisiae expression system. Conclusions: Each patient carried a severe mutation that decreased the PMM activity to less than 10% as well as a relatively mild mutation. A new mutation, deletion of base 24, changed the reading frame. The C9Y, C241S, and L32R mutations showed 27% to 45% activity when expressed in the eukaryotic expression system, and the more severe D148N was shown to be thermolabile.
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