重复序列,尤其是转座因子(TE),已知在重要的无脊椎动物类腹足纲的一些成员中丰富。没有长末端重复序列的TE(非LTRTE)通常是最丰富的类型,但在任何腹足动物中都没有得到很好的表征。尽管如此,腹足类基因组中的序列通常被描述为非LTRTEs,但没有家庭类型的识别。这项研究是为了表征neritimoph蜗牛中的非LTRTE,使用对三个物种的基因组略读调查和最近发布的Theodoxusfluviatilis基因组草案。来自I的多个非LTRTEs家族,骑师,发现了L1,R2和RTE超家族,尽管第一个代表很少,尽管如此,它在其他腹足类动物中还是很丰富的。来自元件ORF2区域的逆转录酶结构域的氨基酸序列的系统发育分析发现,在非LTR家族和亚家族中,四个神经形态类群的代表大量散布。相比之下,来自元素\'ORF1区域的序列的系统发育分析将来自单个物种的代表解析为单系。然而,使用任一地区,两种神经科的成员密切相关,表明他们有可能在家族一级研究种系进化。
Repeated sequences, especially transposable elements (TEs), are known to be abundant in some members of the important invertebrate class Gastropoda. TEs that do not have long terminal repeated sequences (non-LTR TEs) are frequently the most abundant type but have not been well characterised in any gastropod. Despite this, sequences in draft gastropod genomes are often described as non-LTR TEs, but without identification to family type. This study was conducted to characterise non-LTR TEs in neritimorph snails, using genomic skimming surveys of three species and the recently published draft genome of Theodoxus fluviatilis. Multiple families of non-LTR TEs from the I, Jockey, L1, R2 and RTE superfamilies were found, although there were notably few representatives of the first of these, which is nevertheless abundant in other Gastropoda. Phylogenetic analyses of amino acid sequences of the reverse transcriptase domain from the elements ORF2 regions found considerable interspersion of representatives of the four neritimorph taxa within non-LTR families and sub-families. In contrast, phylogenetic analyses of sequences from the elements\' ORF1 region resolved the representatives from individual species as monophyletic. However, using either region, members of the two species of the Neritidae were closely related, suggesting their potential for investigation of phyletic evolution at the family level.