Complete plasmid sequences derived from various strains of Pyrococcus sp. JT1. Pyrococcus sp. JT1

Bacterial plasmids are self-replicating, extrachromosomal elements associated with a variety of phenotypic traits including virulence, enhanced fitness, and resistance to antimicrobial agents. They play an important role in the transfer of genetic material in microbial populations within and between the species. The study of mobile genetic elements such as plasmids is of particular interest because of their ecological, biological, and clinical significance. The Refseq collection of plasmids represent complete sequences derived from different bacterial strains and is organized by host organism at the species level.

细菌质粒（Bacterial plasmids）是一类可自主复制的染色体外遗传元件，与毒力、适应性增强以及抗微生物药物耐药性等多种表型性状密切相关。其在微生物种群内部及不同物种间的遗传物质转移过程中发挥着重要作用。鉴于质粒等可移动遗传元件（mobile genetic elements）在生态学、生物学及临床层面均具有重要意义，对其的研究广受关注。质粒RefSeq参考序列集收录了源自不同细菌菌株的完整序列，并按照宿主生物的物种层级进行分类组织。