The complete mitochondrial genome of Buccinum bayani (Gastropoda: Buccininae) in Korea

Abstract This study is the first to report the complete 15,262 base pair mitochondrial genome of Buccinum bayani, consisting of 13 protein-coding genes, two ribosomal RNA genes, 22 transfer RNA genes, and a control region (D-loop). The overall base composition of the complete genome is A (29.87%), T (39.11%), G (15.86%), and C (15.16%), with a high AT content of 68.98%. Phylogenetic analysis showed that B. bayani was most closely related to B. undatum. The mitogenome of B. bayani will provide helpful information to further our phylogenetic and evolutionary understanding of the family Buccininae.

Buccinum bayani Jousseaume, 1883 is a gastropod that is harvested in Korea and Japan. It is found at depths of 100-400 m on the east coast of South Korea and is collected for commercial purposes. As an aquatic resource, it is a highclass gastropod and is very popular in Korea. However, there have been instances where Buccinum tsubai, which is similar to B. bayani, has been illegally sold as B. bayani to increase profits. Therefore, this study provides details of the mitogenome of B. bayani and initial data to develop species-specific markers. Our study will aid taxonomic understanding of the family Buccininae.
The B. bayani specimens in this study were caught in the East Sea (37 43 0 N, 129 23 0 E) of South Korea and purchased from a Korean market. A specimen was studied after morphological identification. B. bayani is an invertebrate and in accordance with the regulations of the Soonchunhyang University Institutional Animal Care and Use Committee (IACUC), invertebrates (gastropods) are exempt from research ethics approval and use for research. Some of the cut muscle tissue inside the shell was stored in 99% ethanol, and a voucher number was assigned in the specimen room of Soonchunhyang University, Asan, Chungcheongnam-do, Republic of Korea (Voucher Storage: Soonchunhyang University; Voucher number: SUC-26729; The person in charge of the collection: KR Kim; email: kimkangrae9586@gmail.com). Before genomic DNA extraction, mucus attached to the muscle tissue was thoroughly washed with triple-distilled water, and genomic DNA was extracted using a Genomic DNA Prep Kit (Biofact, Yuseong-Gu, Daejeon, Korea). The extracted genomic DNA was stored at À80 C.
We used an MGI Easy DNA Library Prep Kit (MGI Technology, Shenzhen, China) and the extracted genomic DNA to produce a DNA library. Sequencing was performed with 150-base-pair (bp) paired-ends using the MGISEQ-2000 platform (MGI). B. bayani raw data were assembled using Geneious 11.0.3 (https://www.geneious.com). The fully assembled mitogenome sequence of B. bayani was annotated using the MITOS web server (Bernt et al. 2013) and deposited in the National Center for Biotechnology Information GenBank under accession number MW646292. The complete mitochondrial genome of B. bayani is 15,262 bp, containing 13 protein-coding genes (PCGs), two ribosomal RNA (rRNA) genes, 22 transfer RNA genes, and a control region (D-loop). Eleven PCGs, excluding the CO3 and ND4 genes, started with ATG. The stop codons of all PCGs terminated with TAA and TAG.
The overall base composition of the B. bayani genome is A (29.87%), T (39.11%), G (15.86%), and C (15.16%), with a high AT content of 68.98%. B. bayani rRNA comprised large and small rRNAs consisting of 1354 and 880 bp, respectively. We used PhyML 3.0 to construct maximum-likelihood phylogenetic trees, and the GTR þ I þ R model proposed in jModelTest 2.1.10 (Guindon and Gascuel 2003;Guindon et al. 2010;Darriba et al. 2012) was applied based on 13 PCG sequences from 15 species.
Phylogenetic analysis showed that B. bayani was most closely related to B. undatum and grouped in the genus Buccinum. The mitogenome of B. bayani will provide helpful information to further our phylogenetic understanding of the genus Buccinum (Figure 1). designed the study. The fourth author (Jong Yeon Park) prepared the draft and collected the data. The corresponding author (Bang In-Cheol) interpreted and approved the data while checking the content of final version of the paper.