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Related Experiment Videos

Trans splicing in trypanosomes--archaism or adaptation?

P W Laird

    Trends in Genetics : TIG
    |July 1, 1989
    PubMed
    Summary

    Trans splicing in trypanosomes generates mature mRNAs from a single transcript. This process, also seen in nematodes and chloroplasts, raises questions about its evolutionary relationship to cis splicing.

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    Area of Science:

    • Molecular Biology
    • Genetics
    • Evolutionary Biology

    Background:

    • Trypanosomes process a single transcription unit covering multiple protein-coding genes.
    • Mature mRNAs are generated through trans-splicing and polyadenylation of the primary transcript.
    • Nuclear mRNAs in trypanosomes acquire a common 5' capped sequence via trans-splicing.

    Purpose of the Study:

    • To investigate the mechanism of mRNA maturation in trypanosomes.
    • To explore the relationship between trans-splicing and cis-splicing systems.
    • To understand the evolutionary origins of trans-splicing.

    Main Methods:

    • Analysis of gene expression and RNA processing in trypanosomes.
    • Comparative genomics and molecular evolution studies.
    • Biochemical assays for splicing machinery.

    Main Results:

    • Demonstration of trans-splicing as the primary mechanism for mRNA maturation in trypanosomes.
    • Identification of a conserved 39-nucleotide capped sequence in all nuclear mRNAs.
    • Evidence suggesting a relationship between trypanosome trans-splicing and other known splicing systems.

    Conclusions:

    • Trans-splicing is essential for generating functional mRNAs in trypanosomes.
    • The study highlights the unique nature of trypanosome RNA processing.
    • Further research is needed to clarify whether trans-splicing is an ancient remnant or a specialized offshoot of cis-splicing.

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