Evolution and expression of core SWI / SNF genes in red algae
- Department of Biology East Carolina University Greenville North Carolina 27858 USA
- Department of Pharmacology and Toxicology Indiana University School of Medicine Indianapolis Indiana 46202 USA
- Sorbonne Université CNRS Integrative Biology of Marine Models (LBI2M) Station Biologique de Roscoff (SBR) 29680 Roscoff France
Red algae are the oldest identifiable multicellular eukaryotes, with a fossil record dating back more than a billion years. During that time two major rhodophyte lineages, bangiophytes and florideophytes, have evolved varied levels of morphological complexity. These two groups are distinguished, in part, by different patterns of multicellular development, with florideophytes exhibiting a far greater diversity of morphologies. Interestingly, during their long evolutionary history, there is no record of a rhodophyte achieving the kinds of cellular and tissue‐specific differentiation present in other multicellular algal lineages. To date, the genetic underpinnings of unique aspects of red algal development are largely unexplored; however, they must reflect the complements and patterns of expression of key regulatory genes. Here we report comparative evolutionary and gene expression analyses of core subunits of the SWI / SNF chromatin‐remodeling complex, which is implicated in cell differentiation and developmental regulation in more well studied multicellular groups. Our results suggest that a single, canonical SWI / SNF complex was present in the rhodophyte ancestor, with gene duplications and evolutionary diversification of SWI / SNF subunits accompanying the evolution of multicellularity in the common ancestor of bangiophytes and florideophytes. Differences in how SWI / SNF chromatin remodeling evolved subsequently, in particular gene losses and more rapid divergence of SWI 3 and SNF 5 in bangiophytes, could help to explain why they exhibit a more limited range of morphological complexity than their florideophyte cousins.
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- DE‐AC02‐05CH11231
- OSTI ID:
- 1479152
- Journal Information:
- Journal of Phycology, Journal Name: Journal of Phycology Vol. 54 Journal Issue: 6; ISSN 0022-3646
- Publisher:
- Wiley-BlackwellCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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