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eiieen新蟲(chóng) (小有名氣)
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[求助]
求剪接圖解釋
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求專業(yè)術(shù)語(yǔ)按幾個(gè)箭頭指向解釋這個(gè)剪接圖,2個(gè)外顯子增強(qiáng)子和1個(gè)內(nèi)含子增強(qiáng)子等怎么作用的。謝謝 剪接.jpg |
專家顧問(wèn) (知名作家)
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專家經(jīng)驗(yàn): +218 |
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你就是這樣提問(wèn)的嗎?intronic splicing enhancer,exonic splicing enhancer的全稱都不能明確寫出嗎!? 我現(xiàn)在知道intronic splicing enhancer,exonic splicing enhancer是分別在于一些intron和exon上的enhancer,有些特定的反式因子與其結(jié)合,按照一般的enhancer的作用機(jī)理(成環(huán)假說(shuō)、扭曲假說(shuō)、滑動(dòng)假說(shuō)和Oozing假說(shuō))影響可變剪接過(guò)程。 “Positive-acting splicing regulatory sequences generally can be classified by their location in either exons or introns. Exonic splicing enhancers are sequences, found in certain exons, that can stimulate spliceosome assembly at the upstream 3' splice site of the exon (Fu et al. 1991; Lavigueur et al. 1993; Sun et al. 1993; Watakabe et al. 1993; Caputi et al. 1994; Dirksen et al. 1994; Staknis and Reed 1994; Tanaka et al. 1994; Tian and Maniatis 1994; Ramchatesingh et al. 1995; Wang et al. 1995). Exonic enhancers are usually purine-rich sequences whose ac- ivity is mediated, at least in part, by a group of molecules known as SR (serine- and arginine-rich) proteins. These are a large family of proteins, found in both Drosophila and mammalian cells, each containing a serine- and arginine-rich domain and one or more RNA-binding domains of the ribonucleoprotein or RNP-type (Fu 1995; Manley and Tacke 1996; Valc~ircel and Green 1996). SR proteins have been implicated in many aspects of the splicing process. Most notably, they have been shown to bind to exonic enhancers and in one case to synergize with more specialized regulatory proteins bound to the enhancer (Lynch and Maniatis 1996). Although less understood than exonic splicing enhancers, there are also intronic sequences that activate splicing (Balvay et al. 1992; Black 1992; Huh and Hynes 1994; Del Gatto and Breathnach 1995; Lou et al. 1995; Sirand-Pugnet et al. 1995; Carlo et al. 1996; Ryan and Cooper 1996). Intronic splicing enhancers are often found in the introns downstream of regulated exons and are required for the splicing of these exons. They have been identified in an array of transcripts, including c-src, fibronectin, ~-tropomyosin, fibroblast growth factor re- ceptor, cardiac troponin T, and calcitonin/calcitonin gene-related peptide. These intronic enhancers contain diverse sequence elements that are often repeated and show a variety of tissue specific regulation. So far, SR proteins have not been found to bind to these sequences. Although the c-src intronic enhancer binds to a complex of proteins, including the heterogeneous nuclear ribonucleoprotein F (hnRNP F), other proteins that mediate splicing through these regulatory sequences are unknown (Min et al. 1995). ”------From :Hosung Min, Christoph W. Turck, Julia M. Nikolic, and Douglas L. Black ,A new regulatory protein, KSRP, mediates exon inclusion through an intronic splicing enhancer,GENES & DEVELOPMENT 1997,11:1023-1036. |
專家顧問(wèn) (知名作家)
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專家經(jīng)驗(yàn): +218 |
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你的圖太小,還沒(méi)有上下文,我看不清楚。cryptic 應(yīng)該是cryptic gene,隱蔽基因。這樣我大致理解為:某個(gè)隱蔽基因的產(chǎn)生,通過(guò)可變剪接(alternative splicing),把不同的外顯子和不同的內(nèi)含子組合到一起,形成最終的外顯子,這種外顯子就是隱蔽基因(cryptic gene),其可能不止一種,在同一個(gè)基因位點(diǎn)上可能產(chǎn)生幾種隱蔽基因(cryptic gene)。因?yàn)閍lternative splicing機(jī)制每次留下的外顯子和去除的內(nèi)含子(intron)不是固定的,而是根據(jù)需要選擇一些DNA片段留下作為外顯子,不是條件下的留下作為外顯子(exon)的一些DNA片段在另外的條件下可能作為intron而被去除了。 箭頭指向是其尾部鏈接的DNA片段連接的作為外顯子(exon)留下的一些DNA片段,箭頭的頭尾連接的字母之間的其他字母是作為intron而被去除了的內(nèi)含子(intron)。每個(gè)箭頭表示一種alternative splicing的一種類型。 起始alternative splicing還有保留原來(lái)的部分的外顯子(exon)和部分內(nèi)含子(intron)的情況。但是你的圖的箭頭的頭部落點(diǎn)沒(méi)有對(duì)應(yīng)到具體字母的應(yīng)該是此類情況。 |
專家顧問(wèn) (知名作家)
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專家經(jīng)驗(yàn): +218 |
新蟲(chóng) (小有名氣)
專家顧問(wèn) (知名作家)
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專家經(jīng)驗(yàn): +218 |
| “2個(gè)外顯子增強(qiáng)子和1個(gè)內(nèi)含子增強(qiáng)子”?要不然原文就是說(shuō)某種sequence motif 有助于形成某種alternative splicing,也就是加強(qiáng)了某些introns 和exons的形成,機(jī)制之一是加強(qiáng)RNA 剪接體的形成和剪接部位的識(shí)別。 |
新蟲(chóng) (小有名氣)
新蟲(chóng) (小有名氣)
專家顧問(wèn) (知名作家)
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專家經(jīng)驗(yàn): +218 |
新蟲(chóng) (小有名氣)
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