ArticleProceedings of the National Academy of Sciences of the United States of America2013
Genome structure and metabolic features in the red seaweed Chondrus crispus shed light on evolution of the Archaeplastida.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 140 papers.
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140 citing papers in PubMed, 376 citations in OpenAlex.
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- Evidence for evolution of a new sex chromosome within the haploid-dominant Marchantiales plant lineage.Journal of integrative plant biology · 2025Article
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- Polysaccharide sulfotransferases: the identification of putative sequences and respective functional characterisation.Essays in biochemistry · 2024Review
- The whole chromosome-level genome provides resources and insights into the endangered fish Percocypris pingi evolution and conservation.BMC genomics · 2024Article
- Evolution of the regulatory subunits for the heteromeric acetyl-CoA carboxylase.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2024Review
80 more citing papers are in PubMed but not listed here.
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58 authors at 15 institutions in 8 countries.
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Abstract
Red seaweeds are key components of coastal ecosystems and are economically important as food and as a source of gelling agents, but their genes and genomes have received little attention. Here we report the sequencing of the 105-Mbp genome of the florideophyte Chondrus crispus (Irish moss) and the annotation of the 9,606 genes. The genome features an unusual structure characterized by gene-dense regions surrounded by repeat-rich regions dominated by transposable elements. Despite its fairly large size, this genome shows features typical of compact genomes, e.g., on average only 0.3 introns per gene, short introns, low median distance between genes, small gene families, and no indication of large-scale genome duplication. The genome also gives insights into the metabolism of marine red algae and adaptations to the marine environment, including genes related to halogen metabolism, oxylipins, and multicellularity (microRNA processing and transcription factors). Particularly interesting are features related to carbohydrate metabolism, which include a minimalistic gene set for starch biosynthesis, the presence of cellulose synthases acquired before the primary endosymbiosis showing the polyphyly of cellulose synthesis in Archaeplastida, and cellulases absent in terrestrial plants as well as the occurrence of a mannosylglycerate synthase potentially originating from a marine bacterium. To explain the observations on genome structure and gene content, we propose an evolutionary scenario involving an ancestral red alga that was driven by early ecological forces to lose genes, introns, and intergenetic DNA; this loss was followed by an expansion of genome size as a consequence of activity of transposable elements.
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