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[Study on the molecular mechanism of antithrombin gene C2759T (Leu99Phe) mutation causing antithrombin deficiency]

Qi-hua Fu1, Wen-bin Wang, Qiu-lan Ding

  • 1Institute of Transfusion Medicine, Blood Centre of Zhejiang Province, Hangzhou 310006, China.

Zhonghua Xue Ye Xue Za Zhi = Zhonghua Xueyexue Zazhi
|June 11, 2005
PubMed
Abstract

Insights

The C2759T (Leu99Phe) mutation in the antithrombin (AT) gene may cause AT deficiency due to impaired secretion and intracellular accumulation of the mutated AT protein. This finding sheds light on the molecular mechanisms of AT deficiency.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Antithrombin (AT) deficiency is a genetic condition increasing thrombotic risk.
  • Understanding the molecular basis of AT gene mutations is crucial for diagnosis and treatment.

Purpose of the Study:

  • To elucidate the molecular mechanism of the antithrombin (AT) gene C2759T (Leu99Phe) mutation in causing AT deficiency.

Main Methods:

  • Constructed a mutated AT cDNA expression plasmid (ATM2759) using the mega-primer method.
  • Transfected COS7 and CHO cells with ATM2759 and wild-type ATN plasmids.
  • Performed in vitro expression studies, antigen level assays, AT activity measurements, and immunofluorescence analysis.

Main Results:

  • Mutated AT (ATM2759) showed significantly reduced antigen levels (35.63%) and activity (47.73%) in the cell culture supernatant compared to wild-type ATN.
  • Immunofluorescence revealed intracellular accumulation of ATM2759 in transfected cells.
  • The Leu99Phe substitution likely does not impact AT's heparin-binding capacity.

Conclusions:

  • Secretion defects and intracellular accumulation of the mutated AT protein are potential mechanisms underlying AT deficiency caused by the C2759T (Leu99Phe) mutation.
  • These findings contribute to understanding the molecular pathology of hereditary antithrombin deficiency.

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