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- Title
Phylogenomics reveals the evolutionary origins of lichenization in chlorophyte algae.
- Authors
Puginier, Camille; Libourel, Cyril; Otte, Juergen; Skaloud, Pavel; Haon, Mireille; Grisel, Sacha; Petersen, Malte; Berrin, Jean-Guy; Delaux, Pierre-Marc; Dal Grande, Francesco; Keller, Jean
- Abstract
Mutualistic symbioses have contributed to major transitions in the evolution of life. Here, we investigate the evolutionary history and the molecular innovations at the origin of lichens, which are a symbiosis established between fungi and green algae or cyanobacteria. We de novo sequence the genomes or transcriptomes of 12 lichen algal symbiont (LAS) and closely related non-symbiotic algae (NSA) to improve the genomic coverage of Chlorophyte algae. We then perform ancestral state reconstruction and comparative phylogenomics. We identify at least three independent gains of the ability to engage in the lichen symbiosis, one in Trebouxiophyceae and two in Ulvophyceae, confirming the convergent evolution of the lichen symbioses. A carbohydrate-active enzyme from the glycoside hydrolase 8 (GH8) family was identified as a top candidate for the molecular-mechanism underlying lichen symbiosis in Trebouxiophyceae. This GH8 was acquired in lichenizing Trebouxiophyceae by horizontal gene transfer, concomitantly with the ability to associate with lichens fungal symbionts (LFS) and is able to degrade polysaccharides found in the cell wall of LFS. These findings indicate that a combination of gene family expansion and horizontal gene transfer provided the basis for lichenization to evolve in chlorophyte algae. Lichen symbiosis between chlorophyte algae and fungi is a key player in ecosystems but our understanding of its evolution and genetic regulation in algae remains limited. This study finds that lichen symbiosis evolved at least three times in algae through gene family expansion and horizontal gene transfers
- Subjects
HORIZONTAL gene transfer; GREEN algae; ALGAE; GENETIC regulation; LICHENS; CONVERGENT evolution; GENE families
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-48787-z