Abstract
Whole transcriptomes of the rotifer Brachionus plicatilis were analyzed using an Illumina sequencer. De novo assembly was performed with 49,122,780 raw reads using Trinity software. Among the assembled 42,820 contigs, 27,437 putative open reading frame contigs were identified (average length 1235bp; N50=1707bp). Functional gene annotation with Gene Ontology and InterProScan, in addition to Kyoto Encyclopedia of Genes and Genomes pathway analysis, highlighted the metabolism of xenobiotics by cytochrome P450 (CYP). In addition, 28 CYP genes were identified, and their transcriptional responses to benzo[α]pyrene (B[α]P) were investigated. Most of the CYPs were significantly upregulated or downregulated (P<0.05) in response to B[α]P, suggesting that Bp-CYP genes play a crucial role in detoxification mechanisms in response to xenobiotics. This study sheds light on the molecular defense mechanisms of the rotifer B. plicatilis in response to exposure to various chemicals.
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