Journal Article

Transcriptome, proteome and draft genome of Euglena gracilis


Background: Photosynthetic euglenids are major contributors to fresh water ecosystems. Euglena gracilis in particular has noted metabolic flexibility, reflected by an ability to thrive in a range of harsh environments. E. gracilis has been a popular model organism and of considerable biotechnological interest, but the absence of a gene catalogue has hampered both basic research and translational efforts. Results: We report a detailed transcriptome and partial genome for E. gracilis Z1. The nuclear genome is estimated to be around 500 Mb in size, and the transcriptome encodes over 36,000 proteins and the genome possesses less than 1% coding sequence. Annotation of coding sequences indicates a highly sophisticated endomembrane system, RNA processing mechanisms and nuclear genome contributions from several photosynthetic lineages. Multiple gene families, including likely signal transduction components, have been massively expanded. Alterations in protein abundance are controlled post-transcriptionally between light and dark conditions, surprisingly similar to trypanosomatids. Conclusions: Our data provide evidence that a range of photosynthetic eukaryotes contributed to the Euglena nuclear genome, evidence in support of the ‘shopping bag’ hypothesis for plastid acquisition. We also suggest that euglenids possess unique regulatory mechanisms for achieving extreme adaptability, through mechanisms of paralog expansion and gene acquisition.

Attached files


Ebenezer, ThankGod E.
Zoltner, Martin
Burrell, Alana
Nenarokova, Anna
Novák Vanclová, Anna M.G.
Prasad, Binod
Soukal, Petr
Santana-Molina, Carlos
O’Neill, Ellis
Nankissoor, Nerissa N.
Vadakedath, Nithya
Daiker, Viktor
Obado, Samson
Silva-Pereira, Sara
Jackson, Andrew P.
Devos, Damien P.
LukeŇ°, Julius
Lebert, Michael
Vaughan, Sue
Hampl, Vladimír
Carrington, Mark
Ginger, Michael L.
Dacks, Joel B.
Kelly, Steven
Field, Mark C.

Oxford Brookes departments

Department of Biological and Medical Sciences


Year of publication: 2019
Date of RADAR deposit: 2022-06-16

Creative Commons License This work is licensed under a Creative Commons Attribution 4.0 International License

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