Brachionus spp. rotifers have been proposed as model organisms for ecotoxicological studies. We analyzed the whole-genome sequence of B. paranguensis through NextDenovo, resulting in a total length of 106.2 Mb and 71 contigs. The N50 and the GC content were 4.13 Mb and 28%, respectively. A total of 18,501 genes were predicted within the genome of B. paranguensis. Prominent detoxification-related gene families of phase I and II detoxifications have been investigated. In parallel with other Brachionus rotifers, high gene expansion was observed in CYP clan 3 and GST sigma class in B. paranguensis. Moreover, species-specific expansion of sulfotransferase (SULTs) and gain of UDP-glucuronosyltransferases (UGTs) through horizontal gene transfer has been specifically found within B. plicatilis complex. This whole-genome analysis of B. paranguensis provides a basis for molecular ecotoxicological studies and provides useful information for comparative studies of the evolution of detoxification mechanisms in Brachionus spp.
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