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ÎÒÏÖÔÚÖªµÀintronic splicing enhancer,exonic splicing enhancerÊÇ·Ö±ðÔÚÓÚһЩintronºÍexonÉϵÄenhancer,ÓÐÐ©ÌØ¶¨µÄ·´Ê½Òò×ÓÓëÆä½áºÏ£¬°´ÕÕÒ»°ãµÄenhancerµÄ×÷ÓûúÀí£¨³É»·¼Ù˵¡¢Å¤Çú¼Ù˵¡¢»¬¶¯¼Ù˵ºÍOozing¼Ù˵)Ó°Ïì¿É±ä¼ô½Ó¹ý³Ì¡£

¡°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 £ºHosung 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.
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