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Mutation analysis of the PIG-A gene in Korean patients with paroxysmal nocturnal haemoglobinuria

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Authors
Yoon, J H; Cho, H I; Park, S S; Chang, Y H; Kim, B K
Issue Date
2002
Publisher
British Medical Association
Citation
J Clin Pathol 2002;55:410-3
Keywords
Antigens, CD59/bloodComplement Inactivator ProteinsDNA Mutational AnalysisErythrocytes/immunologyFrameshift MutationHemoglobinuria, Paroxysmal/*genetics/immunologyMembrane Proteins/*geneticsMiddle Aged*MutationPoint Mutation
Abstract
AIM: Paroxysmal nocturnal haemoglobinuria (PNH) is caused by deficient biosynthesis of the glycosylphosphatidylinositol (GPI) anchor in haemopoietic stem cells. Mutation of the phosphatidylinositol glycan class A (PIG-A) gene, an X linked gene that participates in the first step of GPI anchor biosynthesis, is responsible for PNH. The characteristics of somatic mutation of the PIG-A gene in Korean patients with PNH were studied. METHODS: Twenty four patients with PNH were selected. Ham tests and sucrose haemolysis tests were carried out on all patients. The expression of CD59 in erythrocytes and granulocytes was investigated in 14 and five patients, respectively, to confirm the diagnosis. Dideoxy fingerprinting (ddF) was used to screen mutations, and direct sequencing of DNA was performed to characterise the mutations. RESULTS: Gene mutation was detected in 12 of the 24 patients. The other 12 patients were negative in ddF screening. Ten new mutations and two known mutations were detected. The mutations consisted of five deletions, six substitutions, and one insertion. These mutations resulted in six premature terminations, three abnormal splicings, one missense mutation in exon 2, and two nonsense mutations. Two patients with venous thrombosis showed mutations in exon 3 only. Substitution mutations were seen in six patients and frameshift mutations in the other six. CONCLUSIONS: There were 10 new mutations among the 12 mutations in the Korean patients with PNH and the characteristics of the mutations varied, with no significant hot spots in sites or types.
ISSN
0021-9746 (Print)
Language
English
URI
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=12037021

http://hdl.handle.net/10371/11107
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College of Medicine/School of Medicine (의과대학/대학원)Internal Medicine (내과학전공)Journal Papers (저널논문_내과학전공)
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