Li Fengping, Zhang Yu, Zhong Tao, Heng Xin, Ao Tiancheng, Gu Zhifeng, Wang Aimin, Liu Chunsheng, Yang Yi
School of Marine Biology and Aquaculture, Hainan University, Haikou 570228, China.
Sanya Nanfan Research Institute, Hainan University, Sanya 572025, China.
Int J Mol Sci. 2023 Sep 8;24(18):13844. doi: 10.3390/ijms241813844.
Different from the diverse family Pectinidae, the Spondylidae is a small group with a single genus that shares the sedentary life habit of cementing themselves to the substrate. However, little information related to the genetic diversity of Spondylidae has been reported. In the present study, the complete mitochondrial genomes of and were sequenced and compared with those of pectinids. The mtDNA of and show similar patterns with respect to genome size, AT content, AT skew, GC skew, and codon usage, and their mitogenomic sizes are longer than most pectinid species. The mtDNA of is 27,566 bp in length, encoding 13 protein-coding genes, 22 transfer RNA genes, and 2 ribosomal RNA genes, while an additional tRNA- was found in the mtDNA of , which is 28,600 bp in length. The monophylies of Spondylidae and Pectinidae were well supported, but the internal relationships within Pectinidae remain unresolved due to the paraphyly of the genus and the controversial position of the tribe Aequipectinini. The gene orders of and are almost identical but differ greatly from species of the Pectinidae, indicating extensive gene rearrangements compared with Pectinidae. Positive selection analysis revealed evidence of adaptive evolution in the branch of Spondylidae. The present study could provide important information with which to understand the evolutionary progress of the diverse and economically significant marine bivalve Pectinoidea.
与种类多样的扇贝科不同，海菊蛤科是一个小类群，只有一个属，它们都有固着在基质上的 sedentary 生活习性。然而，关于海菊蛤科遗传多样性的信息报道较少。在本研究中，对[具体物种1]和[具体物种2]的完整线粒体基因组进行了测序，并与扇贝科的线粒体基因组进行了比较。[具体物种1]和[具体物种2]的线粒体DNA在基因组大小、AT含量、AT偏斜、GC偏斜和密码子使用方面表现出相似的模式，并且它们的线粒体基因组大小比大多数扇贝科物种更长。[具体物种1]的线粒体DNA长度为27,566 bp，编码13个蛋白质编码基因、22个转移RNA基因和2个核糖体RNA基因，而在[具体物种2]的线粒体DNA中发现了一个额外的tRNA-[具体名称]，其长度为28,600 bp。海菊蛤科和扇贝科的单系性得到了很好的支持，但由于[某个属]的并系性和艾氏扇贝族有争议的位置，扇贝科内部的亲缘关系仍未解决。[具体物种1]和[具体物种2]的基因顺序几乎相同，但与扇贝科的物种有很大差异，这表明与扇贝科相比存在广泛的基因重排。正选择分析揭示了海菊蛤科分支中适应性进化的证据。本研究可以为理解种类多样且具有重要经济意义的海洋双壳类海扇超科的进化进程提供重要信息。
原文中“sedentary”可能有误，推测可能是“sedentary”（固着的），翻译时按此推测翻译，若有误请根据正确信息调整。
