Genome characterization and comparative analysis among three swimming crab species

In this study we sequenced the genomes of three economically important swimming crabs Portunus trituberculatus, Charybdis japonica , and Callinectes sapidus using next-generation sequencing approach made a basic assembly. The species are characterized with high heterozygosity (>1.2%) repeat content (>50%). Genome comparative analysis revealed 40 long conserved fragments (>5,000 bp) among species, most them involved in cardiac-related biological process. Relative higher genome similarity was found between P. trituberculatus C. that belong to different subfamilies, compared which from same subfamily. It is inconsistent their phylogenetic evolutionary trees inferred previous mitochondrial DNA coding ANK2 protein fragment study. We speculated might be attributed inhabit range subject environment selection, inconsistence relationship caused by rates non-coding under selection.