Heterogeneous Nuclear Ribonucleoprotein L Is a Subunit of Human KMT3a/Set2 Complex Required for H3 Lys-36 Trimethylation Activity in Vivo

The presence of histone H3 lysine 36 methylation (H3K36me) correlates with actively transcribed genes. In yeast, histone H3K36me mediated by KMT3 (also known as Set2) recruits a histone deacetylase complex, Rpd3s, to ensure the fidelity of transcription initiation. We report the purification of human KMT3a (also known as HYPB or hSet2) complex and the identification of a novel, higher eukaryotic specific subunit, heterogeneous nuclear ribonucleoprotein L (HnRNP-L). Interestingly, although KMT3a has intrinsic activity in vitro, HnRNP-L is essential in vivo. Moreover, KMT3a generates mono-, di-, and trimethylated products in vitro, but RNA interference against KMT3a or HnRNP-L down-regulates exclusively the H3K36me3 mark in vivo. The presence of histone H3 lysine 36 methylation (H3K36me) correlates with actively transcribed genes. In yeast, histone H3K36me mediated by KMT3 (also known as Set2) recruits a histone deacetylase complex, Rpd3s, to ensure the fidelity of transcription initiation. We report the purification of human KMT3a (also known as HYPB or hSet2) complex and the identification of a novel, higher eukaryotic specific subunit, heterogeneous nuclear ribonucleoprotein L (HnRNP-L). Interestingly, although KMT3a has intrinsic activity in vitro, HnRNP-L is essential in vivo. Moreover, KMT3a generates mono-, di-, and trimethylated products in vitro, but RNA interference against KMT3a or HnRNP-L down-regulates exclusively the H3K36me3 mark in vivo. In the last two decades, histone modifications have been recognized as being pivotal to nearly all DNA templated processes in eukaryotes (for reviews, see Refs. 1.Jenuwein T. Allis C.D. Science. 2001; 293: 1074-1080Crossref PubMed Scopus (7709) Google Scholar, 2.Margueron R. Trojer P. Reinberg D. Curr. Opin. Genet. Dev. 2005; 15: 163-176Crossref PubMed Scopus (609) Google Scholar, 3.Martin C. Zhang Y. Nat. Rev. Mol. Cell Biol. 2005; 6: 838-849Crossref PubMed Scopus (1615) Google Scholar, 4.Li B. Carey M. Workman J.L. Cell. 2007; 128: 707-719Abstract Full Text Full Text PDF PubMed Scopus (2706) Google Scholar, 5.Kouzarides T. Cell. 2007; 128: 693-705Abstract Full Text Full Text PDF PubMed Scopus (8183) Google Scholar). Eukaryotic transcription is highly influenced by various histone modification events. Besides the well studied marks of histone acetylation, several histone marks have been linked to active transcription: mono-ubiquitination of histone H2BK123 (Lys-120 in vertebrates) and methylation of histones H3K4, H3K36, and H3K79 (for reviews, see Refs. 6.Hampsey M. Reinberg D. Cell. 2003; 113: 429-432Abstract Full Text Full Text PDF PubMed Scopus (255) Google Scholar, 7.Shilatifard A. Annu. Rev. Biochem. 2006; 75: 243-269Crossref PubMed Scopus (898) Google Scholar, 8.Berger S.L. Nature. 2007; 447: 407-412Crossref PubMed Scopus (2167) Google Scholar, 9.Weake V.M. Workman J.L. Mol. Cell. 2008; 29: 653-663Abstract Full Text Full Text PDF PubMed Scopus (545) Google Scholar). Yeast KMT3, the first enzyme identified as mediating H3K36 methylation (10.Strahl B.D. Grant P.A. Briggs S.D. Sun Z.W. Bone J.R. Caldwell J.A. Mollah S. Cook R.G. Shabanowitz J. Hunt D.F. Allis C.D. Mol. Cell Biol. 2002; 22: 1298-1306Crossref PubMed Scopus (433) Google Scholar), is linked to transcription elongation via its interaction with the Ser-2-phosphorylated C-terminal domain of RNA polymerase II (11.Li J. Moazed D. Gygi S.P. J. Biol. Chem. 2002; 277: 49383-49388Abstract Full Text Full Text PDF PubMed Scopus (213) Google Scholar, 12.Li B. Howe L. Anderson S. Yates 3rd, J.R. Workman J.L. J. Biol. Chem. 2003; 278: 8897-8903Abstract Full Text Full Text PDF PubMed Scopus (276) Google Scholar, 13.Xiao T. Hall H. Kizer K.O. Shibata Y. Hall M.C. Borchers C.H. Strahl B.D. Genes Dev. 2003; 17: 654-663Crossref PubMed Scopus (326) Google Scholar, 14.Krogan N.J. Kim M. Tong A. Golshani A. Cagney G. Canadien V. Richards D.P. Beattie B.K. Emili A. Boone C. Shilatifard A. Buratowski S. Greenblatt J. Mol. Cell Biol. 2003; 23: 4207-4218Crossref PubMed Scopus (519) Google Scholar) through its C-terminal SRI domain (15.Kizer K.O. Phatnani H.P. Shibata Y. Hall H. Greenleaf A.L. Strahl B.D. Mol. Cell Biol. 2005; 25: 3305-3316Crossref PubMed Scopus (367) Google Scholar). KMT3-mediated H3K36 methylation (H3K36me) 4The abbreviations used are: H3K36meH3K36 methylationHnRNP-Lheterogeneous nuclear ribonucleoprotein LRNAiRNA interferenceCMVcytomegalovirusMALDImatrix-assisted laser-desorption/ionizationTOFtime-of-flightMSmass spectrometryMS/MStandem MSsiRNAsmall interference RNAGSTglutathione S-transferase. serves as a docking site to recruit a histone deacetylase complex, Rpd3s, which in turn deacetylates the nucleosomes residing at the coding regions to ensure the fidelity of transcription initiation (16.Carrozza M.J. Li B. Florens L. Suganuma T. Swanson S.K. Lee K.K. Shia W.J. Anderson S. Yates J. Washburn M.P. Workman J.L. Cell. 2005; 123: 581-592Abstract Full Text Full Text PDF PubMed Scopus (980) Google Scholar, 17.Keogh M.C. Kurdistani S.K. Morris S.A. Ahn S.H. Podolny V. Collins S.R. Schuldiner M. Chin K. Punna T. Thompson N.J. Boone C. Emili A. Weissman J.S. Hughes T.R. Strahl B.D. Grunstein M. Greenblatt J.F. Buratowski S. Krogan N.J. Cell. 2005; 123: 593-605Abstract Full Text Full Text PDF PubMed Scopus (616) Google Scholar, 18.Joshi A.A. Struhl K. Mol. Cell. 2005; 20: 971-978Abstract Full Text Full Text PDF PubMed Scopus (415) Google Scholar, 19.Li B. Gogol M. Carey M. Lee D. Seidel C. Workman J.L. Science. 2007; 316: 1050-1054Crossref PubMed Scopus (258) Google Scholar). On the other hand, H3K36 methylation can also recruit the NuA3 histone acetyltransferase complex through its PhD finger domain-containing subunit Nto1 (20.Martin D.G. Grimes D.E. Baetz K. Howe L. Mol. Cell Biol. 2006; 26: 3018-3028Crossref PubMed Scopus (62) Google Scholar, 21.Shi X. Kachirskaia I. Walter K.L. Kuo J.H. Lake A. Davrazou F. Chan S.M. Martin D.G. Fingerman I.M. Briggs S.D. Howe L. Utz P.J. Kutateladze T.G. Lugovskoy A.A. Bedford M.T. Gozani O. J. Biol. Chem. 2007; 282: 2450-2455Abstract Full Text Full Text PDF PubMed Scopus (204) Google Scholar). The means by which H3K36me-mediated recruitment of histone deacetylase and histone acetyltransferase activities is balanced remains an interesting question. However, NuA3 interacts with the Set1 methyltransferase, and NuA3 function depends on both Set1 and its substrate H3K4 (20.Martin D.G. Grimes D.E. Baetz K. Howe L. Mol. Cell Biol. 2006; 26: 3018-3028Crossref PubMed Scopus (62) Google Scholar). Therefore a possibility is that these histone deacetylase and histone acetyltransferase complexes are differentially recruited depending on the co-presence of H3K4me and H3K36me within the same or neighboring nucleosomes. H3K36 methylation heterogeneous nuclear ribonucleoprotein L RNA interference cytomegalovirus matrix-assisted laser-desorption/ionization time-of-flight mass spectrometry tandem MS small interference RNA glutathione S-transferase. In higher eukaryotes, H3K36 methylation is also linked with active transcription (22.Bannister A.J. Schneider R. Myers F.A. Thorne A.W. Crane-Robinson C. Kouzarides T. J. Biol. Chem. 2005; 280: 17732-17736Abstract Full Text Full Text PDF PubMed Scopus (320) Google Scholar, 23.Bell O. Wirbelauer C. Hild M. Scharf A.N. Schwaiger M. MacAlpine D.M. Zilbermann F. van Leeuwen F. Bell S.P. Imhof A. Garza D. Peters A.H. Schübeler D. EMBO J. 2007; 26: 4974-4984Crossref PubMed Scopus (135) Google Scholar, 24.Xu L. Zhao Z. Dong A. Soubigou-Taconnat L. Renou J.P. Steinmetz A. Shen W.H. Mol. Cell Biol. 2008; 28: 1348-1360Crossref PubMed Scopus (247) Google Scholar). Interestingly, reduced levels of H3K36 methylation lead to subsequent reductions in H4K16 acetylation (23.Bell O. Wirbelauer C. Hild M. Scharf A.N. Schwaiger M. MacAlpine D.M. Zilbermann F. van Leeuwen F. Bell S.P. Imhof A. Garza D. Peters A.H. Schübeler D. EMBO J. 2007; 26: 4974-4984Crossref PubMed Scopus (135) Google Scholar), which further impacts dosage compensation in Drosophila (25.Bell O. Conrad T. Kind J. Wirbelauer C. Akhtar A. Schübeler D. Mol. Cell Biol. 2008; 28: 3401-3409Crossref PubMed Scopus (53) Google Scholar). In mammals, methylation of H3K36 is also mediated by the NSD family of enzymes (26.Rayasam G.V. Wendling O. Angrand P.O. Mark M. Niederreither K. Song L. Lerouge T. Hager G.L. Chambon P. Losson R. EMBO J. 2003; 22: 3153-3163Crossref PubMed Scopus (282) Google Scholar), 5Y. Li and D. Reinberg, unpublished observations. and NSD family HKMTs share high sequence similarity with yeast KMT3 only at the Set domain, but not other regions. In contrast, KMT3a (also known as HYPB or hSet2) is the mammalian orthologue of yeast KMT3, which shares high sequence similarity with yeast KMT3a at the Set domain, as well as at the WW and SRI domains. KMT3a specifically methylates H3K36 (27.Sun X.J. Wei J. Wu X.Y. Hu M. Wang L. Wang H.H. Zhang Q.H. Chen S.J. Huang Q.H. Chen Z. J. Biol. Chem. 2005; 280: 35261-35271Abstract Full Text Full Text PDF PubMed Scopus (187) Google Scholar). Interestingly, unlike the yeast KMT3, knockdown of KMT3a results in the reduction of H3K36me3 exclusively, without affecting the other H3K36 methylation states (me1 and me2) in mammals (28.Edmunds J.W. Mahadevan L.C. Clayton A.L. EMBO J. 2008; 27: 406-420Crossref PubMed Scopus (379) Google Scholar) as well as in Drosophila (23.Bell O. Wirbelauer C. Hild M. Scharf A.N. Schwaiger M. MacAlpine D.M. Zilbermann F. van Leeuwen F. Bell S.P. Imhof A. Garza D. Peters A.H. Schübeler D. EMBO J. 2007; 26: 4974-4984Crossref PubMed Scopus (135) Google Scholar). Here we report the purification of human KMT3a complex and the identification of a novel, higher eukaryotic specific subunit, heterogeneous nuclear ribonucleoprotein L (HnRNP-L). Interestingly, although KMT3a has intrinsic activity in vitro, RNAi against HnRNP-L leads to the reduction of H3K36me3 in vivo, without affecting KMT3a expression levels. HnRNP-L is a member of a large family of RRM domain-containing RNA-binding proteins. It has been implicated in various RNA-related processes, particularly in mediating selective exon inclusion during alternative splicing (29.Hui J. Stangl K. Lane W.S. Bindereif A. Nat. Struct. Biol. 2003; 10: 33-37Crossref PubMed Scopus (133) Google Scholar, 30.Rothrock C.R. House A.E. Lynch K.W. EMBO J. 2005; 24: 2792-2802Crossref PubMed Scopus (118) Google Scholar, 31.Melton A.A. Jackson J. Wang J. Lynch K.W. Mol. Cell Biol. 2007; 27: 6972-6984Crossref PubMed Scopus (66) Google Scholar, 32.Hung L.H. Heiner M. Hui J. Schreiner S. Benes V. Bindereif A. RNA. 2008; 14: 284-296Crossref PubMed Scopus (120) Google Scholar) and facilitating polyadenylation (32.Hung L.H. Heiner M. Hui J. Schreiner S. Benes V. Bindereif A. RNA. 2008; 14: 284-296Crossref PubMed Scopus (120) Google Scholar, 33.Guang S. Felthauser A.M. Mertz J.E. Mol. Cell Biol. 2005; 25: 6303-6313Crossref PubMed Scopus (59) Google Scholar). These so-called “post-transcriptional” events are known to be “co-transcriptional” (34.Orphanides G. Reinberg D. Cell. 2002; 108: 439-451Abstract Full Text Full Text PDF PubMed Scopus (715) Google Scholar, 35.Maniatis T. Reed R. Nature. 2002; 416: 499-506Crossref PubMed Scopus (928) Google Scholar) and occur proximal to the chromatin templates. Our finding that HnRNP-L plays a role in regulating chromatin modification suggests the existence of an elaborative cross-talk between the chromatin template and co-transcriptional pre-mRNA processing. Antibodies against modified histones were purchased from Millipore. Antibody against H3 was kindly provided by Dr. Xingwang Deng, from the National Institute of Biological Sciences, Beijing. This antibody is a rabbit polyclonal generated with recombinant full-length H3 as immunogen, which recognize H3 regardless of its modification status. Antibody against HnRNP-L was a kind gift from Dr. Gideon Dreyfuss from the Howard Hughes Medical Institute, Dept. of Biochemistry and Biophysics, University of Pennsylvania School of Medicine, Philadelphia. pFLAG-KMT3a-C and pFLAG-HnRNP-L were stably transfected into HEK293 cells to generate the FLAG-KMT3a-C and FLAG-HnRNP-L stable cell lines, respectively. Both plasmids were based on pCMV4-FLAG from Sigma, with a FLAG tag fused at the N terminus, under the control of CMV promoter. M2 anti-FLAG-agarose (Sigma) was equilibrated with the same buffer used in nuclear extract preparation (20 mm Tris-HCl (pH 7.9), 1.5 mm MgCl2, 0.42 m NaCl, and 0.2 mm phenylmethylsulfonyl fluoride) and then incubated overnight at 4 °C with nuclear extract derived from the stable cell lines. The resin was washed with excess amounts of buffer containing 20 mm Tris-HCl (pH 7.9), 1.5 mm MgCl2, 0.2 mm phenylmethylsulfonyl fluoride, 0.5 m KCl, and proteins eluted with the same buffer supplemented with 0.1 mg/ml FLAG peptide. Anti-FLAG affinity-purified materials were further fractionated on a 2.4-ml Superose at 4 with buffer containing 20 mm Tris-HCl (pH 7.9), 0.2 mm phenylmethylsulfonyl fluoride, and 0.5 m proteins were with and and were by matrix-assisted laser-desorption/ionization time-of-flight of was by on the same identification was by the of the with the of nuclear derived from HEK293 cells stably FLAG-KMT3a-C were incubated with excess amounts of at °C The were then to antibody against HnRNP-L in with its control between KMT3a and HnRNP-L was under by with buffer containing 20 mm Tris-HCl (pH 7.9), 1.5 mm MgCl2, 0.2 mm phenylmethylsulfonyl fluoride, 0.5 m KCl, and of containing recombinant and enzymes in buffer mm 20 mm KCl, mm MgCl2, mm and mm was incubated at The products were by and then to cells with HnRNP-L were The of HnRNP-L knockdown were from (32.Hung L.H. Heiner M. Hui J. Schreiner S. Benes V. Bindereif A. RNA. 2008; 14: 284-296Crossref PubMed Scopus (120) Google Scholar). The were as and RNA stable RNAi cell KMT3a were purchased from were with HEK293 cells transfected with against HnRNP-L were Yeast KMT3 interacts with RNA polymerase II (11.Li J. Moazed D. Gygi S.P. J. Biol. Chem. 2002; 277: 49383-49388Abstract Full Text Full Text PDF PubMed Scopus (213) Google Scholar, 12.Li B. Howe L. Anderson S. Yates 3rd, J.R. Workman J.L. J. Biol. Chem. 2003; 278: 8897-8903Abstract Full Text Full Text PDF PubMed Scopus (276) Google Scholar, 13.Xiao T. Hall H. Kizer K.O. Shibata Y. Hall M.C. Borchers C.H. Strahl B.D. Genes Dev. 2003; 17: 654-663Crossref PubMed Scopus (326) Google Scholar, 14.Krogan N.J. Kim M. Tong A. Golshani A. Cagney G. Canadien V. Richards D.P. Beattie B.K. Emili A. Boone C. Shilatifard A. Buratowski S. Greenblatt J. Mol. Cell Biol. 2003; 23: 4207-4218Crossref PubMed Scopus (519) Google Scholar), and its purification under not other (10.Strahl B.D. Grant P.A. Briggs S.D. Sun Z.W. Bone J.R. Caldwell J.A. Mollah S. Cook R.G. Shabanowitz J. Hunt D.F. Allis C.D. Mol. Cell Biol. 2002; 22: 1298-1306Crossref PubMed Scopus (433) Google Scholar). with complexes in higher eukaryotes and in that from yeast B. Y. H. S.K. P. Reinberg D. Genes Dev. 2005; PubMed Scopus Google Scholar, B. Y. H. P. Reinberg D. Mol. Cell. 2005; 20: Full Text Full Text PDF PubMed Scopus Google Scholar), we to the human KMT3a complex to its function in The of yeast KMT3 in is which has highly and of function to the of to stably full-length KMT3a in mammalian we an HEK293 stable cell that a of the C-terminal of KMT3a derived from stable cell were to purification M2 resin under (for see by Superose Interestingly, FLAG-KMT3a-C with a a complex with an mass of mass spectrometry identified the as HnRNP-L HnRNP-L is an RNA-binding with RNA was that the between KMT3a and HnRNP-L was being mediated by an RNA However, of the nuclear with excess amounts of at °C to purification not the between KMT3a and HnRNP-L the is to further the finding as well as to a complex containing full-length we a stable cell purification with nuclear from these cells the full-length KMT3a which was by not see also and activity and We cell nuclear and against KMT3a and HnRNP-L to interaction under Antibodies against KMT3a the HnRNP-L In a against HnRNP-L the KMT3a In control antibody against was the regions of KMT3a its interaction with several KMT3a were and from then incubated with recombinant HnRNP-L from and to the of the that two regions of KMT3a with HnRNP-L the sequence between the WW domain and the domain, and of the SRI domain not of the in control not In the KMT3a domain to with HnRNP-L the on HnRNP-L its interaction with several HnRNP-L were and from then incubated with the recombinant KMT3a and to the of the that two regions of KMT3a with HnRNP-L The containing the first RRM domain of HnRNP-L was to with the C-terminal of KMT3a of the the RRM domain the interaction by to the KMT3a sequence between the and WW and of These the of and further purification of the were to not We then the histone the human KMT3a complex from HEK293 cells stably The results to be a specific activity on histones In its activity was specific H3K36, the was as a other of histone H3 were This is with that the substrate of the recombinant KMT3a domain (27.Sun X.J. Wei J. Wu X.Y. Hu M. Wang L. Wang H.H. Zhang Q.H. Chen S.J. Huang Q.H. Chen Z. J. Biol. Chem. 2005; 280: 35261-35271Abstract Full Text Full Text PDF PubMed Scopus (187) Google Scholar). of the products in the in that KMT3a is of H3K36 to mono-, di-, and trimethylated This is in to that in vivo. RNAi against KMT3a exclusively reduced the H3K36me3 mark in vivo, without affecting the and in mammals (28.Edmunds J.W. Mahadevan L.C. Clayton A.L. EMBO J. 2008; 27: 406-420Crossref PubMed Scopus (379) Google Scholar) or in Drosophila (23.Bell O. Wirbelauer C. Hild M. Scharf A.N. Schwaiger M. MacAlpine D.M. Zilbermann F. van Leeuwen F. Bell S.P. Imhof A. Garza D. Peters A.H. Schübeler D. EMBO J. 2007; 26: 4974-4984Crossref PubMed Scopus (135) Google Scholar). further the of the KMT3a complex in vivo, with to its identified HnRNP-L subunit, we the levels of various histone modifications in cells HnRNP-L HnRNP-L knockdown in cells were then by various against histone proteins and specific histone In cells with of the HnRNP-L we H3K36me3 but in the levels of or the other modifications these we also HEK293 cells transfected with HnRNP-L and with against HnRNP-L and histone H3 or modified histone the essential role of HnRNP-L in H3K36me3 levels in vivo. with the results in of the other modifications were HnRNP-L knockdown the same on histone H3K36 as KMT3a knockdown (28.Edmunds J.W. Mahadevan L.C. Clayton A.L. EMBO J. 2008; 27: 406-420Crossref PubMed Scopus (379) Google Scholar), we HnRNP-L the activity of KMT3a were recombinant and from or of the two recombinant proteins activity as In in recombinant HnRNP-L was with to activity HnRNP-L not to KMT3a activity under these results were in the presence of RNA not In we the and of the human KMT3a complex, which is of KMT3a and a higher eukaryotic specific subunit KMT3a has intrinsic activity in (27.Sun X.J. Wei J. Wu X.Y. Hu M. Wang L. Wang H.H. Zhang Q.H. Chen S.J. Huang Q.H. Chen Z. J. Biol. Chem. 2005; 280: 35261-35271Abstract Full Text Full Text PDF PubMed Scopus (187) Google Scholar) HnRNP-L is its activity in Moreover, KMT3a generates mono-, di-, and trimethylated products in but RNAi against KMT3a (23.Bell O. Wirbelauer C. Hild M. Scharf A.N. Schwaiger M. MacAlpine D.M. Zilbermann F. van Leeuwen F. Bell S.P. Imhof A. Garza D. Peters A.H. Schübeler D. EMBO J. 2007; 26: 4974-4984Crossref PubMed Scopus (135) Google Scholar, J.W. Mahadevan L.C. Clayton A.L. EMBO J. 2008; 27: 406-420Crossref PubMed Scopus (379) Google Scholar) or HnRNP-L down-regulates exclusively the H3K36me3 mark in vivo, other HKMTs be H3K36 and in vivo. unpublished that and The by which HnRNP-L to the activity of KMT3a is an question. possibility is that HnRNP-L plays a role in the KMT3a complex to regions in This is that HnRNP-L is an RNA-binding with sequence (29.Hui J. Stangl K. Lane W.S. Bindereif A. Nat. Struct. Biol. 2003; 10: 33-37Crossref PubMed Scopus (133) Google Scholar, X. Mertz J.E. Genes Dev. PubMed Scopus Google Scholar). It is an possibility that selective RNA the of the KMT3a complex at chromatin to of HnRNP-L is a higher eukaryotic specific subunit of the KMT3a complex, H3K36me3 are to in high chromatin in higher eukaryotes be to or the existence of possibility is that HnRNP-L to the KMT3a to the H3K36me3 mark on the template which in turn recruit in co-transcriptional RNA higher eukaryotes a subunit that specifically activity H3K36 the of are higher eukaryotic specific of H3K36me3 to be HnRNP-L is an RNA-binding in pre-mRNA events (29.Hui J. Stangl K. Lane W.S. Bindereif A. Nat. Struct. Biol. 2003; 10: 33-37Crossref PubMed Scopus (133) Google Scholar, 30.Rothrock C.R. House A.E. Lynch K.W. EMBO J. 2005; 24: 2792-2802Crossref PubMed Scopus (118) Google Scholar, 31.Melton A.A. Jackson J. Wang J. Lynch K.W. Mol. Cell Biol. 2007; 27: 6972-6984Crossref PubMed Scopus (66) Google Scholar, 32.Hung L.H. Heiner M. Hui J. Schreiner S. Benes V. Bindereif A. RNA. 2008; 14: 284-296Crossref PubMed Scopus (120) Google Scholar, 33.Guang S. Felthauser A.M. Mertz J.E. Mol. Cell Biol. 2005; 25: 6303-6313Crossref PubMed Scopus (59) Google Scholar), are higher eukaryotic specific of are linked to co-transcriptional pre-mRNA as splicing alternative and is a higher eukaryotic specific yeast not have In contrast, human are and by (for reviews, see Refs. Annu. Rev. Biochem. 2003; PubMed Scopus Google Scholar, Genes Dev. 2005; PubMed Scopus (59) Google Scholar) these small of the is that other are is that the chromatin of in or are by specific histone that recruit the splicing its to the of the splicing a mark the site of recruit that in turn recruits and the of splicing in 3rd, S. Chen H. P. J.L. Reinberg D. Mol. Cell. 2007; 28: Full Text Full Text PDF PubMed Scopus Google Scholar). However, as of chromatin specifically the or have not been H3K36me3 be a in as HnRNP-L is a in alternative splicing (29.Hui J. Stangl K. Lane W.S. Bindereif A. Nat. Struct. Biol. 2003; 10: 33-37Crossref PubMed Scopus (133) Google Scholar, 30.Rothrock C.R. House A.E. Lynch K.W. EMBO J. 2005; 24: 2792-2802Crossref PubMed Scopus (118) Google Scholar, 31.Melton A.A. Jackson J. Wang J. Lynch K.W. Mol. Cell Biol. 2007; 27: 6972-6984Crossref PubMed Scopus (66) Google Scholar, 32.Hung L.H. Heiner M. Hui J. Schreiner S. Benes V. Bindereif A. RNA. 2008; 14: 284-296Crossref PubMed Scopus (120) Google Scholar) as is also a subunit of a enzyme complex essential its In of that the splicing recognize the H3K36me3 a report that H3K36me3 is specifically at the P. T. I. T. J. Nat. Genet. PubMed Scopus Google Scholar). to be is of a highly sequence on the pre-mRNA Nature. PubMed Scopus Google Scholar, M. T. Cell. 24: Full Text PDF PubMed Scopus Google Scholar). a sequence occur by is to be an in the of yeast, a to the of polyadenylation in mammals that pre-mRNA products of containing higher eukaryotes to ensure transcription and This that a a that has been by the polyadenylation be with histone to transcription a histone modification the transcription site H. Schneider R. A.J. J. S.L. J. Kouzarides T. Nature. 2002; PubMed Scopus Google Scholar, R. A.J. Myers F.A. Thorne A.W. Crane-Robinson C. Kouzarides T. Nat. Cell Biol. 6: PubMed Scopus Google Scholar) has been to recruit RNA polymerase II transcription M. K.W. S. van M.P. M. Cell. 2007; Full Text Full Text PDF PubMed Scopus Google Scholar). In transcription the mark at the initiation which in turn the recruited transcription the initiation of subsequent H3K36me3 serves as an interesting to mark the site not only has a higher but also its levels to at the of (22.Bannister A.J. Schneider R. Myers F.A. Thorne A.W. Crane-Robinson C. Kouzarides T. J. Biol. Chem. 2005; 280: 17732-17736Abstract Full Text Full Text PDF PubMed Scopus (320) Google Scholar). We are to Dr. Gideon Dreyfuss from the Howard Hughes Medical Institute, Dept. of Biochemistry and Biophysics, University of Pennsylvania School of Medicine, against We Dr. Bindereif from the Institute of of human HnRNP-L We Dr. Xingwang from the National Institute of Biological Sciences, against histone We are to Dr. L. D. on the with

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