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MiR-128 and miR-125 regulate expression of coagulation Factor IX gene with nonsense mutation by repressing

Gang Wang1, Baofeng Chai2, Linhua Yang1

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

Biomedicine & Pharmacotherapy = Biomedecine & Pharmacotherapie
|May 3, 2016
PubMed

Insights

Nonsense mutations in the Factor IX gene cause hemophilia. Nonsense-mediated mRNA decay (NMD) regulates these mutations, with microRNAs potentially increasing Factor IX levels by repressing NMD.

Area of Science:

  • Genetics
  • Molecular Biology
  • Biochemistry

Background:

  • Hemophilia can result from nonsense mutations in the Factor IX gene (F9), leading to Factor IX deficiency.
  • Nonsense-mediated mRNA decay (NMD) is a cellular surveillance pathway that degrades aberrant mRNAs containing premature termination codons (PTCs).

Purpose of the Study:

  • To investigate the role of NMD in regulating the expression of Factor IX (F9) variants with nonsense mutations.
  • To determine the impact of PTC location on NMD efficiency for F9 transcripts.
  • To explore the potential of microRNAs (miRNAs) in modulating NMD of F9 nonsense mutants.

Main Methods:

  • Construction and characterization of a Factor IX mini-gene (Mini-hF9) with various nonsense mutations.
  • Analysis of mini-gene splicing patterns and transcript levels.
  • Transfection with miRNA mimics (miR-128, miR-125) to assess their effect on NMD.

Main Results:

  • NMD regulated Mini-hF9 expression in specific nonsense mutants (E7a, E7b) but not others (E7c, E8).
  • The location of the premature termination codon (PTC) was identified as a critical factor in triggering NMD.
  • Transfection with miR-128 or miR-125 mimics led to the accumulation of mini-hF9 transcripts in affected mutants (E7a, E7b).

Conclusions:

  • PTC position is a key determinant for NMD activation in Factor IX nonsense mutants.
  • miR-128 and miR-125 can potentially enhance nonsense-mutant F9 levels by inhibiting NMD.
  • These findings offer insights into therapeutic strategies for hemophilia by modulating mRNA decay pathways.
Keywords:
Factor IXHemophiliaMicroRNANMDNonsense mutation

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