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Actin gene sequence from Euglena gracilis

S K Petersen-Mahrt¹, S K Petersen-Mahrt, S Widell

¹Department of Plant Biology, Lund University, Sweden.

The Journal of Eukaryotic Microbiology

|December 29, 1998

Summary

Researchers sequenced the Euglena gracilis actin gene, revealing similarities and divergences compared to other actins. Phylogenetic analysis places Euglena gracilis with trypanosomes, suggesting evolutionary links.

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Area of Science:

Molecular Biology
Evolutionary Biology
Biochemistry

Background:

Actins are essential cytoskeletal proteins conserved across eukaryotes.
Understanding actin diversity provides insights into evolutionary relationships.
Euglena gracilis, a unique protist, offers a valuable model for studying eukaryotic evolution.

Purpose of the Study:

To determine the full-length coding sequence of the Euglena gracilis actin gene.
To analyze the sequence conservation and divergence of Euglena gracilis actin.
To investigate the evolutionary position of Euglena gracilis using actin-based phylogenetic analysis.

Main Methods:

Messenger RNA (mRNA) from Euglena gracilis was isolated.
Reverse transcription polymerase chain reaction (RT-PCR) was employed to amplify the actin gene.
Degenerate primers, designed from conserved actin regions, were used for PCR.
DNA sequencing determined the nucleotide sequence of the actin gene.
Sequence similarity comparisons and phylogenetic tree construction were performed.

Main Results:

The full-length coding sequence of the Euglena gracilis actin gene was successfully determined (1,131 coding nucleotides, 377 amino acids).
Sequence comparisons revealed 56% to 80% similarity with other known actin sequences.
While generally conserved, specific regions like the N-terminal DNase I-binding loop exhibited significant divergence.
Phylogenetic analysis clustered Euglena gracilis with Trypanosoma brucei and Leishmania major.

Conclusions:

The Euglena gracilis actin gene sequence provides a new data point for actin research.
The observed sequence conservation and divergence highlight the evolutionary plasticity of actin.
Phylogenetic placement suggests a potential evolutionary relationship between Euglena gracilis and kinetoplastid parasites.

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