Convergent recruitment of life cycle regulators to direct sporophyte development in two eukaryotic supergroups

Author:

Arun Alok,Coelho Susana M.,Peters Akira F.,Bourdareau Simon,Peres Laurent,Scornet Delphine,Strittmatter Martina,Lipinska Agnieszka P.,Yao Haiqin,Godfroy Olivier,Montecinos Gabriel J.,Avia Komlan,Macaisne NicolasORCID,Troadec Christelle,Bendahmane Abdelhafid,Cock J. Mark

Abstract

AbstractThree amino acid loop extension homeodomain transcription factors (TALE HD TFs) act as life cycle regulators in green algae and land plants. In mosses these regulators are required for the deployment of the sporophyte developmental program. We demonstrate that mutations in either of two TALE HD TF genes, OUROBOROS or SAMSARA, in the brown alga Ectocarpus result in conversion of the sporophyte generation into a gametophyte. The OUROBOROS and SAMSARA proteins heterodimerise in a similar manner to TALE HD TF life cycle regulators in the green lineage. These observations demonstrate that TALE-HD-TF-based life cycle regulation systems have an extremely ancient origin, and that these systems have been independently recruited to regulate sporophyte developmental programs in at least two different complex multicellular eukaryotic supergroups, Archaeplastida and Chromalveolata.

Publisher

Cold Spring Harbor Laboratory

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