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Kozak sequences regulate gene expression in Trypanosoma brucei.

Philip Stettler1, Marina Cristodero1, Norbert Polacek1

  • 1Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Bern 3012, Switzerland.

Nucleic Acids Research
|April 9, 2026
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Summary

In Trypanosoma brucei, a specific Kozak sequence motif, particularly a +5C, influences protein levels. This finding offers a novel method for controlling protein abundance in transgenic trypanosomes.

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Area of Science:

  • Molecular Biology
  • Parasitology
  • Genetics

Background:

  • The Kozak consensus sequence is crucial for efficient translation initiation in eukaryotes.
  • Investigating the Kozak sequence in Trypanosoma brucei is important due to its unique mRNA processing (polycistronic transcription).
  • Transcriptional regulation of individual mRNAs is absent in T. brucei, necessitating post-transcriptional regulatory mechanisms.

Purpose of the Study:

  • To investigate the presence and function of Kozak consensus sequences in Trypanosoma brucei.
  • To determine if Kozak sequences contribute to post-transcriptional regulation of protein levels in T. brucei.
  • To explore the potential of manipulating Kozak sequences for controlling protein expression in transgenic trypanosomes.

Main Methods:

  • Analysis of total and subpopulation mRNA sequences in T. brucei and other kinetoplastids.
  • In vivo reporter assays to assess the impact of different Kozak sequence variants on translation levels.
  • Comparison of translation initiation from AUG and CUG codons influenced by Kozak sequences.

Main Results:

  • No general Kozak consensus sequence was found in the total mRNA population of T. brucei.
  • A specific Kozak motif with a +5C bias was identified in constitutively expressed trypanosomal mRNAs.
  • Defined "weak" and "strong" Kozak sequences correlating with low and high translation levels, respectively.
  • Strong Kozak sequences facilitated initiation from CUG codons.

Conclusions:

  • Kozak sequences, particularly the +5C, play a role in regulating protein levels in T. brucei, compensating for the lack of transcriptional control.
  • The identified Kozak motifs provide a novel strategy for predictable modulation of protein abundance in transgenic trypanosomes.