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    • 8. 发明申请
    • Methods and compositions for gene silencing
    • 用于基因沉默的方法和组合物
    • US20070130653A1
    • 2007-06-07
    • US11455073
    • 2006-06-16
    • David BaulcombeEnno KrebbersWilliam HitzKimberly GlassmanMilo AukermanRobert WilliamsByung-Chun Yoo
    • David BaulcombeEnno KrebbersWilliam HitzKimberly GlassmanMilo AukermanRobert WilliamsByung-Chun Yoo
    • A01H1/00C07H21/02C12N15/82C07H21/04C12N5/04
    • C12N15/8218C07H21/02C07H21/04C12N2310/14
    • Methods and compositions are provided for reducing the level of expression of a target polynucleotide in an organism. The methods and compositions selectively silence the target polynucleotide through the expression of a chimeric polynucleotide comprising the target for a sRNA (the trigger sequence) operably linked to a sequence corresponding to all or part of the gene or genes to be silenced. In this manner, the final target of silencing is an endogenous gene in the organism in which the chimeric polynucleotide is expressed. In a further embodiment, the miRNA target is that of a heterologous miRNA or siRNA, the latter of which is coexpressed in the cells at the appropriate developmental stage to provide silencing of the final target when and where desired. In a further embodiment, the final target may be a gene in a second organism, such as a plant pest, that feeds upon the organism containing the chimeric gene or genes. Compositions further comprise vectors, seeds, grain, cells, and organisms, including plants and plant cells, comprising the chimeric polynucleotide of the invention.
    • 提供了用于降低生物体中靶多核苷酸表达水平的方法和组合物。 所述方法和组合物通过表达嵌合多核苷酸来选择性沉默靶多核苷酸,所述嵌合多核苷酸包含可操作地连接到对应于待沉默的基因或基因的全部或部分的序列的sRNA(触发序列)的靶。 以这种方式,沉默的最终靶标是其中表达嵌合多核苷酸的生物体中的内源基因。 在另一个实施方案中,miRNA靶是异源miRNA或siRNA的靶标,其后者在合适的发育阶段在细胞中共表达,以在需要时和期望时提供最终靶的沉默。 在另一个实施方案中,最终靶可以是在含有嵌合基因或基因的生物体上进食的第二生物体如植物害虫中的基因。 组合物还包含载体,种子,谷粒,细胞和生物,包括植物和植物细胞,其包含本发明的嵌合多核苷酸。