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The genome of the European estuarine calanoid copepod Eurytemora affinis: potential use in molecular ecotoxicology


In this study, we sequenced and assembled the genome of a European estuarine calanoid copepod using Oxford Nanopore PromethION and Illumina HiSeq 2500 platforms. The length of the assembled genome was 776.1 Mb with N50 = 474.9 kb (BUSCO 85.9%), and the genome consisted of 2473 contigs. A total of 18,014 genes were annotated and orthologous gene clusters were analyzed in comparison to other copepods.

In addition, genome-wide identification of cytochrome P450s, glutathione S-transferases, and ATP-binding cassette transporters in E. affinis was performed to determine gene repertoire of these detoxification-related gene families. Results revealed the presence of species-specific gene inventories, indicating that these gene families have evolved through species-specific gene loss/expansion processes, possibly due to adaptation to different environmental stressors.

Our study provides a new inventory of the European estuarine calanoid copepod E. affinis genome with emphasis on phase I, II, and III detoxification systems.

Authors: Beom-Soon Choi, Duck-Hyun Kim, Min-Sub Kim, Jun Chul Park, Young Hwan Lee, Hee-Jin Kim, Chang-Bum Jeong, Atsushi Hagiwara, Sami Souissi, Jae-Seong Lee

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