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S phase

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122: 227: 314: 305:). SLBP binding is required for efficient processing, export, and translation of histone mRNAs, allowing it to function as a highly sensitive biochemical "switch". During S-phase, accumulation of SLBP acts together with NPAT to drastically increase the efficiency of histone production. However, once S-phase ends, both SLBP and bound RNA are rapidly degraded. This immediately halts histone production and prevents a toxic buildup of free histones. 25: 322:
nucleosome octamers, resulting in the release of H3-H4 and H2A-H2B subunits. Reassembly of nucleosomes behind the replication fork is mediated by chromatin assembly factors (CAFs) that are loosely associated with replication proteins. Though not fully understood, the reassembly does not appear to utilize the
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scheme seen in DNA replication. Labeling experiments indicate that nucleosome duplication is predominantly conservative. The paternal H3-H4 core nucleosome remains completely segregated from newly synthesized H3-H4, resulting in the formation of nucleosomes that either contain exclusively old H3-H4
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Complete replication fork assembly and activation only occurs on a small subset of replication origins. All eukaryotes possess many more replication origins than strictly needed during one cycle of DNA replication. Redundant origins may increase the flexibility of DNA replication, allowing cells to
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However, for small domains approaching the size of individual genes, old nucleosomes are spread too thinly for accurate propagation of histone modifications. In these regions, chromatin structure is probably controlled by incorporation of histone variants during nucleosome reassembly. The close
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detects stalled replication forks by integrating signals from RPA, ATR Interacting Protein (ATRIP), and RAD17. Upon activation, the replication checkpoint upregulates nucleotide biosynthesis and blocks replication initiation from unfired origins. Both of these processes contribute to rescue of
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Free histones produced by the cell during S-phase are rapidly incorporated into new nucleosomes. This process is closely tied to the replication fork, occurring immediately in “front” and “behind” the replication complex. Translocation of MCM helicase along the leading strand disrupts parental
290:, a nuclear coactivator of histone transcription. NPAT is activated by phosphorylation and recruits the Tip60 chromatin remodeling complex to the promoters of histone genes. Tip60 activity removes inhibitory chromatin structures and drives a three to ten-fold increase in transcription rate. 182:(R), which commits cells to the remainder of the cell-cycle if there is adequate nutrients and growth signaling. This transition is essentially irreversible; after passing the restriction point, the cell will progress through S-phase even if environmental conditions become unfavorable. 413:
cells dramatically prolongs S-phase and causes permanent arrest in G2-phase. This unique arrest phenotype is not associated with activation of canonical DNA damage pathways, indicating that nucleosome assembly and histone supply may be scrutinized by a novel S-phase checkpoint.
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Immediately after division, each daughter chromatid only possesses half the epigenetic modifications present in the paternal chromatid. The cell must use this partial set of instructions to re-establish functional chromatin domains before entering mitosis.
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Activation of the pre-RC is a closely regulated and highly sequential process. After Cdc7 and S-phase CDKs phosphorylate their respective substrates, a second set of replicative factors associate with the pre-RC. Stable association encourages
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During S-phase, the cell continuously scrutinizes its genome for abnormalities. Detection of DNA damage induces activation of three canonical S-phase "checkpoint pathways" that delay or arrest further cell cycle progression:
343:) and several other histone-modifying complexes can "copy" modifications present on old histones onto new histones. This process amplifies epigenetic marks and counters the dilutive effect of nucleosome duplication. 372:
blocks mitosis until the entire genome has been successfully duplicated. This pathway induces arrest by inhibiting the Cyclin-B-CDK1 complex, which gradually accumulates throughout the cell cycle to promote mitotic
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kinases. In addition to facilitating DNA repair, active ATR and ATM stalls cell cycle progression by promoting degradation of CDC25A, a phosphatase that removes inhibitory phosphate residues from CDKs.
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transcription factor, which in turn initiates expression of S-phase genes. Several E2F target genes promote further release of E2F, creating a positive feedback loop similar to the one found in yeast.
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In addition to these canonical checkpoints, recent evidence suggests that abnormalities in histone supply and nucleosome assembly can also alter S-phase progression. Depletion of free histones in
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Accordingly, entry into S-phase is controlled by molecular pathways that facilitate a rapid, unidirectional shift in cell state. In yeast, for instance, cell growth induces accumulation of Cln3
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distributed throughout the genome. During S-phase, the cell converts pre-RCs into active replication forks to initiate DNA replication. This process depends on the kinase activity of
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correlation seen between H3.3/H2A.Z and transcriptionally active regions lends support to this proposed mechanism. Unfortunately, a causal relationship has yet to be proven.
164:. Since accurate duplication of the genome is critical to successful cell division, the processes that occur during S-phase are tightly regulated and widely conserved. 339:
For large genomic regions, inheritance of old H3-H4 nucleosomes is sufficient for accurate re-establishment of chromatin domains. Polycomb Repressive Complex 2 (
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or exclusively new H3-H4. “Old” and “new” histones are assigned to each daughter strand semi-randomly, resulting in equal division of regulatory modifications.
792:"Stem-loop binding protein, the protein that binds the 3' end of histone mRNA, is cell cycle regulated by both translational and posttranslational mechanisms" 689:"Transcriptional activation of histone genes requires NPAT-dependent recruitment of TRRAP-Tip60 complex to histone promoters during the G1/S phase transition" 208:
signals received throughout G1-phase cause gradual accumulation of cyclin D, which complexes with CDK4/6. Active cyclin D-CDK4/6 complex induces release of
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In addition to increasing transcription of histone genes, S-phase entry also regulates histone production at the RNA level. Instead of
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sliding clamps. Loading of these factors completes the active replication fork and initiates synthesis of new DNA.
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to unwind a small stretch of parental DNA into two strands of ssDNA, which in turn recruits replication protein A (
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CDK2. The Cln3-CDK2 complex promotes transcription of S-phase genes by inactivating the transcriptional repressor
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proteins occurs alongside DNA replication. During early S-phase, the cyclin E-Cdk2 complex phosphorylates
1501: 75: 258:), an ssDNA binding protein. RPA recruitment primes the replication fork for loading of replicative DNA 1642: 1345: 1078:"DNA repair by nonhomologous end joining and homologous recombination during cell cycle in human cells" 251: 1340: 1335: 1330: 1325: 1320: 1315: 1310: 1305: 1300: 201:, this pathway creates a positive feedback loop that fully commits cells to S-phase gene expression. 57: 394: 42: 1292: 235: 190: 35: 1624: 1375: 255: 239: 926: 401:
double-strand breaks, is most active in S phase, declines in G2/M and is nearly absent in
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Bartek J, Lukas C, Lukas J (October 2004). "Checking on DNA damage in S phase".
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Whitfield ML, Zheng LX, Baldwin A, Ohta T, Hurt MM, Marzluff WF (June 2000).
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Conservative reassembly of core H3/H4 nucleosome behind the replication fork.
841:"How the cell cycle impacts chromatin architecture and influences cell fate" 246:
and various S-phase CDKs, both of which are upregulated upon S-phase entry.
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control the rate of DNA synthesis and respond to replication stress.
1132:"Histone supply regulates S phase timing and cell cycle progression" 1046: 544: 24: 1663: 1603: 1588: 1557: 1543: 1273: 1255: 1241: 1227: 402: 197:. Since upregulation of S-phase genes drive further suppression of 157: 149: 204:
A remarkably similar regulatory scheme exists in mammalian cells.
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DNA replication phase of the cell cycle, between G1 and G2 phase
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Mao Z, Bozzella M, Seluanov A, Gorbunova V (September 2008).
1075: 529:"Control of cell cycle transcription during G1 and S phases" 1515: 1506: 1476: 1455: 1393: 687:
DeRan M, Pulvino M, Greene E, Su C, Zhao J (January 2008).
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to function properly, synthesis of canonical (non-variant)
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motif that selective binds to Stem Loop Binding Protein (
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Throughout M phase and G1 phase, cells assemble inactive
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Asymmetry in the synthesis of leading and lagging strands
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stalled forks by increasing the availability of dNTPs.
838: 912: 686: 1130:GĂĽnesdogan U, Jäckle H, Herzig A (September 2014). 527:Bertoli C, Skotheim JM, de Bruin RA (August 2013). 49:. Unsourced material may be challenged and removed. 496: 591:"DNA replication and progression through S phase" 1689: 1032: 740: 632: 1193: 1069: 588: 463:The cell cycle : principles of control 178:Entry into S-phase is controlled by the G1 1200: 1186: 976: 913:Ramachandran S, Henikoff S (August 2015). 639:Cold Spring Harbor Perspectives in Biology 1492:Cellular apoptosis susceptibility protein 1157: 1147: 1101: 994: 946: 866: 856: 815: 766: 712: 658: 606: 552: 350: 308: 109:Learn how and when to remove this message 839:Ma Y, Kanakousaki K, Buttitta L (2015). 741:Marzluff WF, Koreski KP (October 2017). 312: 225: 120: 1207: 500:The Restriction Point of the Cell Cycle 1690: 1035:Nature Reviews. Molecular Cell Biology 1028: 1026: 1024: 1022: 1020: 1018: 1016: 1014: 908: 906: 633:Leonard AC, MĂ©chali M (October 2013). 533:Nature Reviews. Molecular Cell Biology 1181: 1125: 1123: 1121: 972: 970: 968: 966: 904: 902: 900: 898: 896: 894: 892: 890: 888: 886: 460: 736: 734: 732: 682: 680: 678: 628: 626: 584: 582: 580: 578: 576: 574: 572: 522: 520: 518: 516: 514: 512: 510: 492: 490: 456: 454: 331:Reestablishment of chromatin domains 278:Since new DNA must be packaged into 273: 47:adding citations to reliable sources 18: 1011: 983:The Journal of Biological Chemistry 497:Pardee AB, Blagosklonny MV (2013). 13: 1118: 963: 883: 743:"Birth and Death of Histone mRNAs" 215: 14: 1709: 729: 675: 623: 589:Takeda DY, Dutta A (April 2005). 569: 507: 487: 451: 808:10.1128/MCB.20.12.4188-4198.2000 23: 34:needs additional citations for 832: 796:Molecular and Cellular Biology 783: 693:Molecular and Cellular Biology 435:(oncology/pathology prognosis) 1: 444: 384:(DSBs) through activation of 167: 977:Annunziato AT (April 2005). 7: 1502:Maturation promoting factor 651:10.1101/cshperspect.a010116 465:. Oxford University Press. 417: 189:, which complexes with the 10: 1714: 1643:Postreplication checkpoint 397:, an accurate process for 219: 171: 1651: 1623: 1570: 1534: 1525: 1469: 1441: 1384: 1291: 1218: 915:"Replicating Nucleosomes" 759:10.1016/j.tig.2017.07.014 635:"DNA replication origins" 236:pre-replication complexes 858:10.3389/fgene.2015.00019 395:Homologous recombination 378:intra-S Phase Checkpoint 191:cyclin dependent kinase 1625:Cell cycle checkpoints 996:10.1074/jbc.R400039200 939:10.1126/sciadv.1500587 608:10.1038/sj.onc.1208616 362:Replication Checkpoint 351:DNA damage checkpoints 318: 309:Nucleosome replication 231: 230:Steps in DNA synthesis 136:) is the phase of the 126: 1652:Other cellular phases 1376:CDK-activating kinase 845:Frontiers in Genetics 316: 229: 124: 1094:10.4161/cc.7.18.6679 705:10.1128/MCB.00607-07 503:. Landes Bioscience. 382:Double Strand Breaks 295:polyadenylated tails 148:, occurring between 43:improve this article 1149:10.7554/eLife.02443 931:2015SciA....1E0587R 424:S phase index (SPI) 240:replication origins 1638:Spindle checkpoint 1443:P53 p63 p73 family 747:Trends in Genetics 319: 232: 127: 1685: 1684: 1681: 1680: 1633:Restriction point 439:Restriction point 324:semi-conservative 274:Histone synthesis 180:restriction point 119: 118: 111: 93: 1705: 1532: 1531: 1202: 1195: 1188: 1179: 1178: 1172: 1171: 1161: 1151: 1127: 1116: 1115: 1105: 1073: 1067: 1066: 1030: 1009: 1008: 998: 974: 961: 960: 950: 919:Science Advances 910: 881: 880: 870: 860: 836: 830: 829: 819: 787: 781: 780: 770: 738: 727: 726: 716: 684: 673: 672: 662: 630: 621: 620: 610: 586: 567: 566: 556: 524: 505: 504: 494: 485: 484: 461:David M (2007). 458: 433:S-phase fraction 114: 107: 103: 100: 94: 92: 51: 27: 19: 1713: 1712: 1708: 1707: 1706: 1704: 1703: 1702: 1688: 1687: 1686: 1677: 1667: 1647: 1619: 1566: 1561: 1547: 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54:Find sources: 48: 44: 38: 37: 32:This article 30: 26: 21: 20: 1594:Prometaphase 1552: 1139: 1135: 1085: 1081: 1071: 1038: 1034: 986: 982: 922: 918: 848: 844: 834: 799: 795: 785: 750: 746: 696: 692: 642: 638: 598: 594: 536: 532: 499: 462: 410: 408: 377: 369: 361: 354: 345: 338: 334: 320: 292: 277: 268: 252:MCM helicase 248: 238:(pre-RC) on 233: 203: 184: 177: 133: 129: 128: 105: 96: 86: 79: 72: 65: 53: 41:Please help 36:verification 33: 1615:Cytokinesis 1584:Preprophase 1528:checkpoints 280:nucleosomes 260:polymerases 1698:Cell cycle 1536:Interphase 1526:Phases and 1209:Cell cycle 1142:: e02443. 1082:Cell Cycle 445:References 429:S-fraction 411:Drosophila 168:Regulation 146:replicated 138:cell cycle 69:newspapers 1659:Apoptosis 1609:Telophase 1599:Metaphase 1394:INK4a/ARF 481:813540567 299:stem loop 206:Mitogenic 140:in which 58:"S phase" 1692:Category 1604:Anaphase 1589:Prophase 1212:proteins 1168:25205668 1112:18769152 1063:33560392 1055:15459660 1005:15664979 957:26269799 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Index


verification
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"S phase"
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cell cycle
DNA
replicated
G1 phase
G2 phase
G1/S transition
restriction point
cyclin
cyclin dependent kinase
Whi5
Whi5
Mitogenic
E2F
DNA replication

pre-replication complexes
replication origins
Cdc7

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