A continuous genome assembly of the corkwing wrasse (Symphodus melops) |
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Authors: | Morten Mattingsdal Sissel Jentoft Ole K. Tørresen Halvor Knutsen Michael M. Hansen Joana I. Robalo Zuzanna Zagrodzka Carl André Enrique Blanco Gonzalez |
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Affiliation: | 1. Centre for Coastal Research, Department of Natural Sciences, University of Agder, Kristiansand, Norway;2. Centre for Ecological and Evolutionary Synthesis, Department of Biosciences, University of Oslo, Oslo, Norway;3. Institute of Marine Research, Flødevigen, Norway;4. Department of Bioscience, Aarhus University, Ny Munkegade 114, DK-8000 Aarhus C, Denmark;5. Marine and Environmental Sciences Centre, ISPA Instituto Universitário de Ciências Psicológicas, Sociais e da Vida, Rua Jardim do Tabaco,34, Lisboa, Portugal;6. Department of Marine Sciences-Tjärnö, University of Gothenburg, 452 96 Strömstad, Sweden |
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Abstract: | The wrasses (Labridae) are one of the most successful and species-rich families of the Perciformes order of teleost fish. Its members display great morphological diversity, and occupy distinct trophic levels in coastal waters and coral reefs. The cleaning behaviour displayed by some wrasses, such as corkwing wrasse (Symphodus melops), is of particular interest for the salmon aquaculture industry to combat and control sea lice infestation as an alternative to chemicals and pharmaceuticals. There are still few genome assemblies available within this fish family for comparative and functional studies, despite the rapid increase in genome resources generated during the past years. Here, we present a highly continuous genome assembly of the corkwing wrasse using PacBio SMRT sequencing (x28.8) followed by error correction with paired-end Illumina data (x132.9). The present genome assembly consists of 5040 contigs (N50?=?461,652?bp) and a total size of 614 Mbp, of which 8.5% of the genome sequence encode known repeated elements. The genome assembly covers 94.21% of highly conserved genes across ray-finned fish species. We find evidence for increased copy numbers specific for corkwing wrasse possibly highlighting diversification and adaptive processes in gene families including N-linked glycosylation (ST8SIA6) and stress response kinases (HIPK1). By comparative analyses, we discover that de novo repeats, often not properly investigated during genome annotation, encode hundreds of immune-related genes. This new genomic resource, together with the ballan wrasse (Labrus bergylta), will allow for in-depth comparative genomics as well as population genetic analyses for the understudied wrasses. |
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Keywords: | Corresponding author. |
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