Biedler James K, Shao Hongguang, Tu Zhijian
Department of Biochemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA.
Genetics. 2007 Dec;177(4):2553-8. doi: 10.1534/genetics.107.081109. Epub 2007 Oct 18.
ITmD37E, a unique class II transposable element (TE) with an ancient origin, appears to have been involved in multiple horizontal transfers in mosquitoes as ITmD37E sequences from 10 mosquito species of five genera share high nucleotide (nt) identities. For example, ITmD37E sequences from Aedes aegypti and Anopheles gambiae, which have an estimated common ancestor of 145-200 million years ago, display 92% nt identity. The comparison of ITmD37E and host mosquito phylogenies shows a lack of congruence. The wide distribution of conserved ITmD37Es in mosquitoes and the presence of intact copies suggest that this element may have been recently active.
ITmD37E是一种起源古老的独特II类转座元件(TE),由于来自五个属的10种蚊子的ITmD37E序列具有较高的核苷酸(nt)同一性,它似乎参与了蚊子中的多次水平转移。例如,埃及伊蚊和冈比亚按蚊的ITmD37E序列,它们估计有1.45 - 2亿年前的共同祖先,显示出92%的核苷酸同一性。ITmD37E与宿主蚊子系统发育的比较显示缺乏一致性。保守的ITmD37E在蚊子中的广泛分布以及完整拷贝的存在表明该元件可能最近仍有活性。