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Interspecific hybridisation and LTR-retrotransposon mobilisation-related structural variation in plants: A case study

机译：植物中的间隙杂交和LTR-RODRANSPOSON相关的结构变异：一个案例研究

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摘要

The dynamics of long-terminal-repeat retrotransposons in two poplar species (Populus deltoides and P. nigra) and in an interspecific hybrid, recently synthesized, were investigated by analyzing the genomic abundance and transcription levels of a collection of 828 full-length retroelements identified in the genome sequence of P. trichocarpa, all occurring also in the genomes of P. deltoides and P. nigra. Overall, genomic abundance and transcription levels of many retrotransposons in the hybrid resulted higher or lower than expected by calculating the mean of the parental values. A bioinformatics procedure was established to ascertain the occurrence of the same retrotransposon loci in the three genotypes. The results indicated that retrotransposon abundance variations between the hybrid and the mean value of the parents were due to i) co-segregation of retrotransposon high- or low-abundant haplotypes; ii) new retroelement insertions; iii) retrotransposon loss. Concerning retrotransposon expression, this was generally low, with only 14/828 elements over- or under-expressed in the hybrid than expected by calculating the mean of the parents. It is concluded that interspecific hybridisation between the two poplar species determine quantitative variation and differential expression of some retrotransposons, with possible consequences for the genetic differentiation of the hybrid.
机译：通过分析所确定的828个全长逆转带的收集的基因组丰度和转录水平，研究了两种杨树物种（Populus Deltroi​​des和P. nigra）和最近合成的三种杂交中的长末端重复转渣的动态。在P.Trichocarpa的基因组序列中，也发生在P. deltoides和P. nigra的基因组中。总体而言，通过计算亲本值的平均值，杂种中许多回析隆的基因组丰度和转录水平导致高于或低于预期。建立了生物信息学程序，以确定三种基因型中相同转回ransposon基因座的发生。结果表明，母体与父母的平均值之间的反朗阳孔丰富变化是由于I）回复朗泊素高或低丰富的单倍型的共同分离; ii）新的逆压力插入; iii）回析探测器损失。关于反朗冬膦表达，这通常是低的，仅通过计算父母的平均值在混合中超出或下表达的14/828元素。结论，两种杨树物种之间的间隙杂交决定了一些转回横向的定量变化和差异表达，可能对杂种遗传分化的影响。

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