Complete mitochondrial genome of the <i>Hydrophis melanocephalus</i> slender-necked sea snake (Squamata, Elapidae)

Yi, Chang-Ho; Park, Jaejin; Sasai, Takahide; Kim, Hye Seon; Kim, Jong-Gwan; Kim, Min-Seop; Cho, In-Young; Kim, Ji Min; Kim, Il-Hun

doi:10.1080/23802359.2020.1735277

Cited by 1 publication

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“…MK775531; 18,259 bp) [ 42 ] and H. melanocephalus (Accession No. MK775532; 17,182 bp) [ 43 ] overlapped with the species sequenced in this study. However, mtDNA sequences reported in these studies for E. ijimae and H. melanocephalus were much shorter than those determined in this study ( Table 1 ).…”

Section: Discussionmentioning

confidence: 99%

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Evolution of the Noncoding Features of Sea Snake Mitochondrial Genomes within Elapidae

Xiaokaiti

Hashiguchi

Ota

et al. 2022

Genes

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Mitochondrial genomes of four elapid snakes (three marine species [Emydocephalus ijimae, Hydrophis ornatus, and Hydrophis melanocephalus], and one terrestrial species [Sinomicrurus japonicus]) were completely sequenced by a combination of Sanger sequencing, next-generation sequencing and Nanopore sequencing. Nanopore sequencing was especially effective in accurately reading through long tandem repeats in these genomes. This led us to show that major noncoding regions in the mitochondrial genomes of those three sea snakes contain considerably long tandem duplications, unlike the mitochondrial genomes previously reported for same and other sea snake species. We also found a transposition of the light-strand replication origin within a tRNA gene cluster for the three sea snakes. This change can be explained by the Tandem Duplication—Random Loss model, which was further supported by remnant intervening sequences between tRNA genes. Mitochondrial genomes of true snakes (Alethinophidia) have been shown to contain duplicate major noncoding regions, each of which includes the control region necessary for regulating the heavy-strand replication and transcription from both strands. However, the control region completely disappeared from one of the two major noncoding regions for two Hydrophis sea snakes, posing evolutionary questions on the roles of duplicate control regions in snake mitochondrial genomes. The timing and molecular mechanisms for these changes are discussed based on the elapid phylogeny.

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Section: Discussionmentioning

confidence: 99%

“…During the course of the present study, complete mtDNA sequences were reported for three semiaquatic sea snakes of the genus Laticauda and several fully aquatic sea snakes of the genera Emydocephalus and Hydrophis (all in the subfamily Hydrophiinae) [ 40 , 41 , 42 , 43 , 44 , 45 ]. Among them, E. ijimae (Accession No.…”

Section: Discussionmentioning

confidence: 99%