Sabot François, Sourdille Pierre, Chantret Nathalie, Bernard Michel
UMR INRA/UBP 1095 Amélioration & Santé des Plantes, 234 Avenue du Brézet, F-63039, Clermont-Ferrand Cedex, France.
Genetica. 2006 Sep-Nov;128(1-3):439-47. doi: 10.1007/s10709-006-7725-5.
Transposable elements are the main components of grass genomes, especially in Triticeae species. In a previous analysis, we identified a very short element, Morgane_CR626934-1; here we describe more precisely this unusual element. Morgane_CR626934-1 shows high sequence identity (until 98%) with ESTs belonging to other possible small elements, expressed under abiotic and biotic stress conditions. No putative functional polyprotein could be identified in all of these different Morgane-like sequences. Moreover, elements from the Morgane_CR626934-1 subfamily are found only in wheats and Agropyrum genomes and among these species, only Ae. tauschii and T. aestivum present a high copy number of these elements. They are highly conserved in wheat genomes (95.5%). Based on the uncommon characteristics of the described Morgane-like elements, we proposed to classify them in a new group within the Class I LTR retrotransposon, the Morgane group.
转座元件是禾本科植物基因组的主要组成部分，尤其是在小麦族物种中。在之前的分析中，我们鉴定出了一个非常短的元件，即Morgane_CR626934-1；在此我们更精确地描述这个不寻常的元件。Morgane_CR626934-1与属于其他可能的小元件的ESTs具有高度的序列同一性（高达98%），这些ESTs在非生物和生物胁迫条件下表达。在所有这些不同的类Morgane序列中均未鉴定出推定的功能性多蛋白。此外，Morgane_CR626934-1亚家族的元件仅在小麦和冰草属基因组中发现，并且在这些物种中，只有节节麦和普通小麦中这些元件的拷贝数较高。它们在小麦基因组中高度保守（95.5%）。基于所描述的类Morgane元件的不寻常特征，我们建议将它们归类为I类LTR反转录转座子中的一个新组，即Morgane组。
