2022
DOI: 10.1038/s41598-022-15320-5
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A thorough annotation of the krill transcriptome offers new insights for the study of physiological processes

Abstract: The krill species Euphausia superba plays a critical role in the food chain of the Antarctic ecosystem. Significant changes in climate conditions observed in the Antarctic Peninsula region in the last decades have already altered the distribution of krill and its reproductive dynamics. A deeper understanding of the adaptation capabilities of this species is urgently needed. The availability of a large body of RNA-seq assays allowed us to extend the current knowledge of the krill transcriptome. Our study covere… Show more

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Cited by 10 publications
(9 citation statements)
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“…Cuticular protein genes are among the largest gene families in arthropod genomes (Magkrioti et al 2004), and help build the exoskeleton. In krill, cuticular development and gene expression are closely linked to physiological and seasonal cycles of ecdysis (molting), growth and reproduction (Buchholz and Buchholz 2010;Urso et al 2022). In krill native to warm waters, we detect potentially selective substitutions in Ecdysone-induced protein 75B (Eip75B), a gene encoding a nuclear receptor that regulates the timing of molting, reproduction and circadian oscillation in insects and crustaceans (Kumar et al 2014;Gouveia et al 2018), that could contribute to adaptation.…”
Section: Scans For Positive Selection Reveal Candidate Genes For Envi...mentioning
confidence: 97%
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“…Cuticular protein genes are among the largest gene families in arthropod genomes (Magkrioti et al 2004), and help build the exoskeleton. In krill, cuticular development and gene expression are closely linked to physiological and seasonal cycles of ecdysis (molting), growth and reproduction (Buchholz and Buchholz 2010;Urso et al 2022). In krill native to warm waters, we detect potentially selective substitutions in Ecdysone-induced protein 75B (Eip75B), a gene encoding a nuclear receptor that regulates the timing of molting, reproduction and circadian oscillation in insects and crustaceans (Kumar et al 2014;Gouveia et al 2018), that could contribute to adaptation.…”
Section: Scans For Positive Selection Reveal Candidate Genes For Envi...mentioning
confidence: 97%
“…S9B), automatically annotated as Rh5. However, queries against KrillDB 2 (Urso et al 2022) and NCBI Genbank suggest it is a peropsin, a light-sensitive yet non-visual receptor with poorly understood function in crustaceans but with expression patterns that oscillate daily in Antarctic krill (Henze and Oakley 2015;Biscontin et al 2016;Palecanda et al 2022).…”
Section: Scans For Positive Selection Reveal Candidate Genes For Envi...mentioning
confidence: 99%
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“…Moreover, we detected expansions of the opsin gene repertoire, which encodes the light-sensitive receptors in ommatidia. Fourteen opsins have previously been identified from RNA in the Antarctic krill E. superba (34), which are thought to enable vision under the divergent light conditions experienced throughout its life cycle and vertical migrations (35), while 16 opsins have recently been inferred from M. norvegica RNA (36). We queried our M. norvegica gene-set and the KrillDB 2 E. superba RNA database against the curated crustacean opsin dataset in ref 35.…”
Section: Expansion Of Cuticular and Opsin Gene Familiesmentioning
confidence: 99%