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Related Experiment Videos

Trypanosoma equiperdum minicircles encode three distinct primary transcripts which exhibit guide RNA characteristics.

V W Pollard1, S L Hajduk

  • 1Department of Biochemistry, University of Alabama, Birmingham School of Medicine 35294.

Molecular and Cellular Biology
|March 1, 1991
PubMed
Summary

Trypanosome kinetoplast DNA includes minicircles encoding guide RNAs for RNA editing. These minicircles have conserved transcription initiation sites and produce heterogeneous transcripts with variable 3' polyuridine tails.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Parasitology

Background:

  • Kinetoplast DNA in trypanosomes consists of catenated maxicircles and minicircles.
  • Maxicircles encode essential mitochondrial proteins and RNAs.
  • Minicircles are thought to produce guide RNAs for maxicircle RNA editing.

Purpose of the Study:

  • To investigate the transcription of Trypanosoma equiperdum minicircles.
  • To characterize the transcripts produced by minicircle transcription units.
  • To explore the potential role of flanking repeats in transcript initiation.

Main Methods:

  • Analysis of Trypanosoma equiperdum minicircle DNA sequences.
  • Identification and characterization of minicircle transcription units and transcripts.

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  • Determination of transcript 5' and 3' end structures.

    • Main Results:

    • Trypanosoma equiperdum minicircles contain three transcription units producing distinct transcripts.
    • Genes are flanked by imperfect repeats, suggesting a role in transcription initiation.
    • Transcripts are primary with 5' triphosphates and exhibit size heterogeneity (55-70 nucleotides) due to variable 3' polyuridine tails.

    Conclusions:

    • Minicircle transcription initiates within a conserved purine sequence near flanking repeats.
    • The variable length 3' polyuridine tails are conserved features potentially linked to transcript function in RNA editing.