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Human DNA polymerase mu (Polµ) can cause large DNA expansions by dislocating and realigning DNA strands. Specific residues regulate this process, potentially leading to mutations and human disorders.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • DNA polymerase mu (Polµ) possesses unique template-directed and terminal transferase activities.
  • Polµ tolerates primer and template strand distortions, leading to misinsertions and extension of mismatched termini.
  • Dinucleotide repeat expansions are implicated in various human genetic disorders.

Purpose of the Study:

  • To propose a model for human Polµ-mediated dinucleotide expansion based on sequence context.
  • To elucidate the mechanistic role of specific Polµ residues in regulating nucleotide expansions.
  • To understand the implications of Polµ activity in DNA repair and mutagenesis.

Main Methods:

  • In vitro biochemical assays to study Polµ activity on various DNA substrates.
  • Site-directed mutagenesis to investigate the function of key Polµ residues (His329, Arg387).
  • Analysis of DNA substrate requirements for Polµ-mediated expansions.

Main Results:

  • A model was developed where Polµ-mediated dinucleotide expansion requires initial DNA dislocation and stabilization.
  • Human Polµ residues His329 and Arg387 were identified as critical regulators of iterative nucleotide polymerization.
  • These residues modulate nucleotide expansions similarly to their role in terminal transferase activity.
  • Polµ can generate large sequence expansions on substrates mimicking non-homologous end-joining (NHEJ) intermediates.

Conclusions:

  • Human Polµ plays a significant role in dinucleotide repeat expansions through a dislocation-stabilization mechanism.
  • Specific amino acid residues within Polµ actively regulate the extent of nucleotide polymerization.
  • Polµ's iterative synthesis activity can lead to frameshift mutations, DNA damage, and instability.
  • Dysregulated Polµ activity may contribute to human diseases such as cancer and congenital abnormalities.