Brierley H L, Potter S S
Nucleic Acids Res. 1985 Jan 25;13(2):485-500. doi: 10.1093/nar/13.2.485.
A few foldback (FB) transposable elements have, between their long terminal inverted repeats, central loop sequences which have been shown to be different from FB inverted repeat sequences. We have investigated loop sequences from two such FB elements by analyzing their genomic distribution and sequence conservation and, in particular, by determining if they are normally associated with FB elements. One of these FB loop sequences seems to be present in a few conserved copies found adjacent to FB inverted repeat sequences, suggesting that it represents an integral component of some FB elements. The other loop sequence is less well-conserved and not usually associated with FB inverted repeats. This sequence is a member of another family of transposable elements, the HB family, and was found inserted in an FB element only by chance. We compare the complete DNA sequences of two HB elements and examine the ends of four HB elements.
一些回折（FB）转座元件在其长末端反向重复序列之间存在中央环序列，这些序列已被证明与FB反向重复序列不同。我们通过分析两个此类FB元件的基因组分布和序列保守性，特别是通过确定它们是否通常与FB元件相关联，来研究其环序列。其中一个FB环序列似乎存在于与FB反向重复序列相邻的一些保守拷贝中，这表明它代表了某些FB元件的一个组成部分。另一个环序列的保守性较差，通常不与FB反向重复序列相关联。该序列是另一个转座元件家族HB家族的成员，只是偶然发现它插入到一个FB元件中。我们比较了两个HB元件的完整DNA序列，并检查了四个HB元件的末端。
