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[Molecular mechanism of microRNA125 regulating human coagulation factor IX gene with nonsense mutation]

G Wang, L H Yang1, B F Chai2

  • 1Department of Hematology, The Second Clinical Medical College, Shanxi Medical University, Taiyuan 030001, China.

Zhonghua Xue Ye Xue Za Zhi = Zhonghua Xueyexue Zazhi
|May 24, 2016
PubMed
Abstract

Insights

Nonsense mutations in the human coagulation factor Ⅸ gene trigger mRNA decay. MicroRNA125 stabilizes this mRNA by inhibiting nonsense-mediated decay, offering a potential therapeutic strategy.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • The F9 gene encodes human coagulation factor IX (hFIX), essential for hemostasis.
  • Nonsense mutations can lead to premature stop codons, often triggering nonsense-mediated mRNA decay (NMD).
  • MicroRNAs (miRNAs) are small non-coding RNAs that regulate gene expression, potentially influencing mRNA stability.

Purpose of the Study:

  • To construct a human coagulation factor Ⅸ mini-gene (Mini-hF9) and its nonsense mutants.
  • To investigate the mechanism by which microRNA125 (miR-125) regulates F9 gene expression in the context of nonsense mutations.
  • To analyze the impact of nonsense mutation location on NMD and miR-125-mediated regulation.

Main Methods:

  • Construction and cloning of the Mini-hF9 gene and three specific nonsense mutants (M1, M2, M3) using PCR mutagenesis.
  • Real-time PCR to quantify Mini-hF9 mRNA levels in mammalian cells co-transfected with mutant expression vectors and miR-125 mimics.
  • Cycloheximide (CHX) experiments to confirm NMD involvement.

Main Results:

  • Successful construction and expression of the Mini-hF9 gene and its nonsense mutants.
  • Nonsense mutations M1 and M2 significantly reduced Mini-hF9 mRNA levels, consistent with NMD.
  • Co-transfection with miR-125 mimics (miR-125a or miR-125b) increased Mini-hF9 mRNA levels in M1 and M2 mutants, indicating repression of NMD.
  • Mutation location was identified as a key factor in triggering NMD.

Conclusions:

  • Nonsense mutation location is critical for initiating nonsense-mediated mRNA decay.
  • MicroRNA125 enhances the stability of Mini-hF9 mRNA with specific nonsense mutations by inhibiting NMD.
  • MicroRNA125 represents a potential therapeutic target for conditions involving NMD-related gene silencing.

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