title: Horizontal transfer of a novel Helentron in insects.
abstract: Helentrons represent a novel subtype of Helitrons. However, the evolutionary history of Helentrons in organisms is not clearly understood. In this study, we performed structure and autonomous partner analyses, which revealed that bm_455, a TE obtained from the Bombyx mori TE database, BmTEdb, was a member of Helentrons but not a long-terminal repeat (LTR) retrotransposon. Further analyses showed that bm_455 was also present in a wide range of insects including lepidopterans, coleopterans and hymenopterans using a homology-based search strategy. Several lines of evidence (high sequence identity, discontinuous distribution and lack of intense purifying selection) suggested that these elements could have been transferred into these species in part by horizontal transfers (HTs). Because Helentrons can capture host gene fragments, HTs of Helentrons might have a huge impact on their host genome evolution.
authors.affiliation: State Key Laboratory of Silkworm Genome Biology, Key Laboratory for Sericulture Functional Genomics and Biotechnology of Agricultural Ministry, Southwest University, Chongqing, 400715, China.|College of Pharmacy and Life Science, Jiujiang University, Jiujiang, 332000, China.
authors.forename: Hua-Hao
authors.initials: HH
authors.lastname: Zhang
authors.affiliation: Department of Pathology, Hanzhoung 3201 Hospital, Hanzhoung city, 723000, Shaanxi, China.
authors.forename: Guo-Yin
authors.initials: GY
authors.lastname: Li
authors.affiliation: Clinical Medical College, Jiujiang University, Jiujiang, 332000, China.
authors.forename: Xiao-Min
authors.initials: XM
authors.lastname: Xiong
authors.affiliation: State Key Laboratory of Silkworm Genome Biology, Key Laboratory for Sericulture Functional Genomics and Biotechnology of Agricultural Ministry, Southwest University, Chongqing, 400715, China.
authors.forename: Min-Jin
authors.initials: MJ
authors.lastname: Han
authors.affiliation: State Key Laboratory of Silkworm Genome Biology, Key Laboratory for Sericulture Functional Genomics and Biotechnology of Agricultural Ministry, Southwest University, Chongqing, 400715, China. fydai@swu.edu.cn.
authors.forename: Fang-Yin
authors.initials: FY
authors.lastname: Dai
mesh_terms: D000818:Animals; D012831:Bombyx / Q000235:genetics*; D004251:DNA Transposable Elements; D022761:Gene Transfer, Horizontal; D016678:Genome; D007313:Insecta / Q000235:genetics; D010802:Phylogeny
chemical_list: D004251:DNA Transposable Elements
keywords: Helentrons; Horizontal transfer; Insects