生物谷報導:在6月11日的PNAS網絡版上,來自哈佛大學分子和細胞生物學系的研究人員發表的論文證實秀麗隱杆線蟲(Caenorhabditis elegans)SID-2是環境RNA幹擾(RNAi)所必須的。
在植物和線蟲(秀麗隱杆線蟲)中,一種RNAi信號能夠引發細胞中遠距離位點的基因沉默。而且,在線蟲中,環境中或其吞食的細菌中表達的dsRNA足以音符RNAi,即環境RNAi dsRNA的攝入和吞食在其他無脊椎動物中也曾有過描述。在哈佛的這項新研究中,研究人員確定並分析了SID-2(一種腸道luminal跨膜蛋白質)是線蟲中發生環境RNAi所必須的。當在不發生環境RNAi的線蟲種(Caenorhabditis briggsae)中表達SID-2時,能夠使這種線蟲擁有了環境RNAi。
原始出處:
Published online before print June 11, 2007 Genetics
Proc. Natl. Acad. Sci. USA, 10.1073/pnas.0611282104
Caenorhabditis elegans SID-2 is required for environmental RNA interference
( dsRNA | transmembrane | intestine lumen )
Department of Molecular and Cellular Biology, Harvard University, 16 Divinity Avenue, Cambridge, MA 02138
Edited by Iva S. Greenwald, Columbia University, New York, NY, and approved March 6, 2007 (received for review December 19, 2006)
Abstract
In plants and in the nematode Caenorhabditis elegans, an RNAi signal can trigger gene silencing in cells distant from the site where silencing is initiated. In plants, this signal is known to be a form of dsRNA, and the signal is most likely a form of dsRNA in C. elegans as well. Furthermore, in C. elegans, dsRNA present in the environment or expressed in ingested bacteria is sufficient to trigger RNAi (environmental RNAi). Ingestion and soaking delivery of dsRNA has also been described for other invertebrates. Here we report the identification and characterization of SID-2, an intestinal luminal transmembrane protein required for environmental RNAi in C. elegans. SID-2, when expressed in the environmental RNAi defective species Caenorhabditis briggsae, confers environmental RNAi.
Fig. 1. sid-2 worms are capable of spreading transgene-initiated RNAi. (A)Wild-type expression of GFP in the pharynx (ph) (myo-2::gfp) and body-wall muscle nuclei (bm) (myo-3::gfp) of an HC46 worm. (B) Expression of dsRNA (myo-2::gfp) in the pharynx causes incomplete silencing of pharynx and body-wall muscle GFP in the HC57 strain. (C)Asid-2(qt13)wormexpressing the same transgenes as HC57 is capable of spreading transgene-initiated RNAi from the pharynx to the body-wall muscle. GFP images were taken at equal exposures. Anterior is upper left. (Scale bar, 0.1 mm.)
相關報導:
RNA幹擾技術及其應用
有望用於治療SARS的新技術:RNA幹擾
BIOTECH CHINA 2007聚焦RNA幹擾技術
RNA幹擾技術及其在神經科學研究中的應用
利用RNA幹擾技術降低Survivin表達量 可抑制食道癌
RNA幹擾與染色質沉默--生物體內精密的網絡調控機制
RNA幹擾的果蠅Hedgehog途徑調控蛋白篩選
RNA幹擾及其幹擾技術