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  • The baseless mutant links protein phosphatase 2A with basal cell identity in the brown alga Ectocarpus.

The baseless mutant links protein phosphatase 2A with basal cell identity in the brown alga Ectocarpus.

Development (Cambridge, England) (2023-02-15)
Olivier Godfroy, Min Zheng, Haiqin Yao, Agnes Henschen, Akira F Peters, Delphine Scornet, Sebastien Colin, Paolo Ronchi, Katharina Hipp, Chikako Nagasato, Taizo Motomura, J Mark Cock, Susana M Coelho
ABSTRACT

The first mitotic division of the initial cell is a key event in all multicellular organisms and is associated with the establishment of major developmental axes and cell fates. The brown alga Ectocarpus has a haploid-diploid life cycle that involves the development of two multicellular generations: the sporophyte and the gametophyte. Each generation deploys a distinct developmental programme autonomously from an initial cell, the first cell division of which sets up the future body pattern. Here, we show that mutations in the BASELESS (BAS) gene result in multiple cellular defects during the first cell division and subsequent failure to produce basal structures during both generations. BAS encodes a type B″ regulatory subunit of protein phosphatase 2A (PP2A), and transcriptomic analysis identified potential effector genes that may be involved in determining basal cell fate. The bas mutant phenotype is very similar to that observed in distag (dis) mutants, which lack a functional Tubulin-binding co-factor Cd1 (TBCCd1) protein, indicating that TBCCd1 and PP2A are two essential components of the cellular machinery that regulates the first cell division and mediates basal cell fate determination.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Anti-Mouse IgG (whole molecule)−Atto 488 antibody produced in goat, ~1 mg/mL
Sigma-Aldrich
Anti-Rabbit IgG (H+L), CF 555 antibody produced in goat, ~2 mg/mL, affinity isolated antibody