Abstract
Complete mitochondrial genomes (mitogenomes) can provide useful information for phylogenetic relationships, gene rearrangement, and evolutionary traits. In this study, we determined the complete mitochondrial DNA sequence of the herbivorous crab Grapsus albolineatus. It is a typical metazoan mitochondrial genome. The total size is 15,583 bp, contains the entire set of 37 genes, and has an AT-rich region. Then, 23 of the 37 genes were encoded by the heavy (+) strand while 14 are encoded by the light (−) strand. Compared with the pan-crustacean ground pattern, two tRNA genes (tRNA-His and tRNA-Gln) were rearranged and the tandem duplication/random loss model was used to explain the observed gene rearrangements. The phylogenetic results showed that all Grapsidae crabs clustered together as a group. Furthermore, the monophyly of each family was well supported, with the exception of Menippidae. In general, the results obtained in this study will contribute to the better understanding of gene rearrangements in Grapsidae crab mitogenomes and provide new insights into the phylogeny of Brachyura.
Highlights
Brachyura crab is the largest clade in the Decapod crustacean group, with more than 7250 known species, including 98 families of marine, freshwater, and terrestrial habitats, most of which are economically important[1]
Most of the 37 genes are located on the heavy (H-) strand, except 4 PCGs (ND5, ND4, ND4L, ND1), 8 transport RNA genes (tRNAs), and 2 rRNA which are located on the light (L-) strand (Fig. 1, Table 2)
The G. albolineatus mitogenome contains 328 bp of intergenic spacers located in 17 regions, ranging from 1 to 122 bp (Table 2) and indicating the occurrence of tandem duplications and the deletions of redundant genes
Summary
Brachyura crab is the largest clade in the Decapod crustacean group, with more than 7250 known species, including 98 families of marine, freshwater, and terrestrial habitats, most of which are economically important[1]. The herbivorous crab (Grapsus albolineatus) is one of the marine crustaceans that live on rocky shores which belongs to the phylum Arthropod, subphylum Crustacea, order Decapoda, infraorder Brachyura, clade Thoracotremata, family Grapsidae, genus Grapsus. They are mainly distributed in Japan, Hawaii, Australia and China’s Guangdong, Hainan Island, Xisha Islands, Taiwan. The TDRL model assumes that the rearranged gene order occurs via tandem duplications followed by random deletion of certain duplications[22] This model has been widely used to explain the translocation of genes encoded on the same s trand[23]. Model tRNA mis-priming model and the tandem duplication/non-random loss model (TDNL) are less commonly used
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