scholarly journals Comprehensive Identification of Cell Cycle–regulated Genes of the YeastSaccharomyces cerevisiaeby Microarray Hybridization

1998 ◽  
Vol 9 (12) ◽  
pp. 3273-3297 ◽  
Author(s):  
Paul T. Spellman ◽  
Gavin Sherlock ◽  
Michael Q. Zhang ◽  
Vishwanath R. Iyer ◽  
Kirk Anders ◽  
...  
Keyword(s):  
Cell Cycle ◽  
Cell Cycle Regulation ◽  
Dna Microarrays ◽  
Full Description ◽  
Temperature Sensitive ◽  
Data Sets ◽  
Mrna Levels ◽  
Yeast Cultures ◽  
Yeast Genes ◽  
Cycle Regulation

We sought to create a comprehensive catalog of yeast genes whose transcript levels vary periodically within the cell cycle. To this end, we used DNA microarrays and samples from yeast cultures synchronized by three independent methods: α factor arrest, elutriation, and arrest of a cdc15 temperature-sensitive mutant. Using periodicity and correlation algorithms, we identified 800 genes that meet an objective minimum criterion for cell cycle regulation. In separate experiments, designed to examine the effects of inducing either the G1 cyclin Cln3p or the B-type cyclin Clb2p, we found that the mRNA levels of more than half of these 800 genes respond to one or both of these cyclins. Furthermore, we analyzed our set of cell cycle–regulated genes for known and new promoter elements and show that several known elements (or variations thereof) contain information predictive of cell cycle regulation. A full description and complete data sets are available at http://cellcycle-www.stanford.edu

The novel human protein serine/threonine phosphatase 6 is a functional homologue of budding yeast Sit4p and fission yeast ppe1, which are involved in cell cycle regulation

1996 ◽  
Vol 109 (12) ◽  
pp. 2865-2874 ◽  
Author(s):  
H. Bastians ◽  
H. Ponstingl
Keyword(s):  
Cell Cycle ◽  
Fission Yeast ◽  
Shape Control ◽  
Cell Cycle Regulation ◽  
Budding Yeast ◽  
Mitotic Checkpoint ◽  
Human Protein ◽  
Predicted Amino Acid Sequence ◽  
Temperature Sensitive ◽  
Cycle Regulation

We identified a novel human protein serine/threonine phosphatase cDNA, designated protein phosphatase 6 (PP6) by using a homology-based polymerase chain reaction. The predicted amino acid sequence indicates a 35 kDa protein showing high homology to other protein phosphatases including human PP2A (57%), human PP4 (59%), rat PPV (98%), Drosophila PPV (74%), Schizosaccharomyces pombe ppe1 (68%) and Saccharomyces cerevisiae Sit4p (61%). In human cells, three forms of PP6 mRNA were found with highest levels of expression in testis, heart and skeletal muscle. The PP6 protein was detected in lysates of human heart muscle and in bull testis. Complementation studies using a temperature sensitive mutant strain of S. cerevisiae SIT4, which is required for the G1 to S transition of the cell cycle, showed that PP6 can rescue the mutant growth arrest. In addition, a loss of function mutant of S. pombe ppe1, described as a gene interacting with the pim1/spi1 mitotic checkpoint and involved in cell shape control, can be complemented by expression of human PP6. These data indicate that human PP6 is a functional homologue of budding yeast Sit4p and fission yeast ppe1, implying a function of PP6 in cell cycle regulation.

scholarly journals Cellular localization and cell cycle regulation by a temperature-sensitive p53 protein.

1991 ◽  
Vol 5 (2) ◽  
pp. 151-159 ◽  
Author(s):  
J Martinez ◽  
I Georgoff ◽  
J Martinez ◽  
A J Levine
Keyword(s):  
Cell Cycle ◽  
Cell Cycle Regulation ◽  
Cellular Localization ◽  
P53 Protein ◽  
Temperature Sensitive ◽  
Cycle Regulation

Growth and cell cycle regulation of mRNA levels in GH3 cells

1991 ◽  
Vol 82 (1) ◽  
pp. 11-22 ◽  
Author(s):  
Peter R. Rhode ◽  
Jack Gorski
Keyword(s):  
Cell Cycle ◽  
Cell Cycle Regulation ◽  
Gh3 Cells ◽  
Mrna Levels ◽  
Cycle Regulation

scholarly journals Stem-Loop Binding Protein, the Protein That Binds the 3′ End of Histone mRNA, Is Cell Cycle Regulated by Both Translational and Posttranslational Mechanisms

2000 ◽  
Vol 20 (12) ◽  
pp. 4188-4198 ◽  
Author(s):  
Michael L. Whitfield ◽  
Lian-Xing Zheng ◽  
Amy Baldwin ◽  
Tomohiko Ohta ◽  
Myra M. Hurt ◽  
...  
Keyword(s):  
Cell Cycle ◽  
Cell Cycle Regulation ◽  
Binding Protein ◽  
S Phase ◽  
Mrna Processing ◽  
Mrna Levels ◽  
Histone Mrna ◽  
Stem Loop ◽  
Histone Mrnas ◽  
Cycle Regulation

ABSTRACT The expression of the replication-dependent histone mRNAs is tightly regulated during the cell cycle. As cells progress from G1 to S phase, histone mRNA levels increase 35-fold, and they decrease again during G2 phase. Replication-dependent histone mRNAs are the only metazoan mRNAs that lack polyadenylated tails, ending instead in a conserved stem-loop. Much of the cell cycle regulation is posttranscriptional and is mediated by the 3′ stem-loop. A 31-kDa stem-loop binding protein (SLBP) binds the 3′ end of histone mRNA. The SLBP is necessary for pre-mRNA processing and accompanies the histone mRNA to the cytoplasm, where it is a component of the histone messenger RNP. We used synchronous CHO cells selected by mitotic shakeoff and HeLa cells synchronized at the G1/S or the M/G1 boundary to study the regulation of SLBP during the cell cycle. In each system the amount of SLBP is regulated during the cell cycle, increasing 10- to 20-fold in the late G1 and then decreasing in the S/G2border. SLBP mRNA levels are constant during the cell cycle. SLBP is regulated at the level of translation as cells progress from G1 to S phase, and the protein is rapidly degraded as they progress into G2. Regulation of SLBP may account for the posttranscriptional component of the cell cycle regulation of histone mRNA.

scholarly journals Characterization and Cell Cycle Regulation of the Major Kaposi’s Sarcoma-Associated Herpesvirus (Human Herpesvirus 8) Latent Genes and Their Promoter

1999 ◽  
Vol 73 (2) ◽  
pp. 1438-1446 ◽  
Author(s):  
Ronit Sarid ◽  
Jeffrey S. Wiezorek ◽  
Patrick S. Moore ◽  
Yuan Chang
Keyword(s):  
Cell Cycle ◽  
Cell Cycle Arrest ◽  
Cell Cycle Regulation ◽  
Kaposi's Sarcoma ◽  
Kaposi’S Sarcoma ◽  
Mrna Levels ◽  
Cycle Arrest ◽  
Kaposi's Sarcoma Associated Herpesvirus ◽  
Kaposi’S Sarcoma Associated Herpesvirus ◽  
Cycle Regulation

ABSTRACT Retinoblastoma tumor suppressor protein (pRB) inhibition by tumor virus oncoproteins has been attributed to the need for these viruses to promote lytic viral nucleic acid synthesis by unscheduled entry into the S phase of the cell cycle. Kaposi’s sarcoma-associated herpesvirus (KSHV or HHV8) encodes a functional cyclin (vCYC) which is expressed during latency and can direct phosphorylation of pRB. We mapped the two major latent transcripts encoding vCYC, latent transcript 1 (LT1) and LT2, by cDNA sequencing, 5′ rapid amplification of cDNA ends, and primer extension analyses. Both LT1 and LT2 transcripts are spliced, originate from the same start site, and encode ORF K13 (vFLIP) as well as ORF72 (vCYC). The latency-associated nuclear antigen (LANA, ORF73) is encoded by LT1 but spliced from LT2. While differential expression of the two transcripts was not found, the promoter controlling LT1/LT2 transcription is regulated in a cell cycle-dependent manner. Activities of both KSHV LT1/LT2 and huCYC D1 luciferase promoter reporters transfected into NIH 3T3 cells increase 11- and 4-fold, respectively, after release from cell cycle arrest by serum starvation. Further, vCYC and huCYC D2 mRNA levels are low in naturally infected BCBL-1 cells arrested in late G1 with l-mimosine but increase in parallel during a 24-h period after release from cell cycle arrest. Cell cycle regulation of KSHV vCYC expression mimics cellular D cyclin regulation and may maintain infected cell cycling. This is consistent with an alternative hypothesis that tumor viruses have developed specific responses to innate cellular defenses against latent virus infection that include pRB-induced cell cycle arrest.

Activating E2Fs mediate transcriptional regulation of human E2F6 repressor

2006 ◽  
Vol 290 (1) ◽  
pp. C189-C199 ◽  
Author(s):  
Tarrah E. Lyons ◽  
Maysoon Salih ◽  
Balwant S. Tuana
Keyword(s):  
Cell Cycle ◽  
Binding Sites ◽  
Cell Cycle Regulation ◽  
Promoter Activity ◽  
Time Course ◽  
Family Members ◽  
Ectopic Expression ◽  
Transcriptional Level ◽  
Mrna Levels ◽  
Cycle Regulation

E2F6 is believed to repress E2F-responsive genes and therefore serve a role in cell cycle regulation. Analysis of the human E2F6 promoter region revealed the presence of two putative E2F binding sites, both of which were found to be functionally critical because deletion or mutations of these sites abolished promoter activity. Ectopic expression of E2F1 protein was found to increase E2F6 mRNA levels and significantly upregulate E2F6 promoter activity. Deletion or mutation of the putative E2F binding sites nullified the effects of E2F1 on the E2F6 promoter activity. Studies on the temporal induction of E2F family members demonstrated that the activating E2Fs, and most notably E2F1, were upregulated before E2F6 during cell cycle progression at the G1/S phase, and this coincided with the time course of induction experienced by the E2F6 promoter during the course of the cell cycle. EMSAs indicated the specific binding of nuclear complexes to the E2F6 promoter that contained E2F1-related species whose binding was specifically competed by the consensus E2F binding site. Chromatin immunoprecipitation assays with anti-E2Fs demonstrated the association of E2F family members with the E2F6 promoter in vivo. These data indicate that the expression of the E2F6 repressor is influenced at the transcriptional level by E2F family members and suggest that interplay among these transcriptional regulators, especially E2F1, may be critical for cell cycle regulation.

Role of pRB dephosphorylation in cell cycle regulation

10.2741/a501 ◽  
2000 ◽  
Vol 5 (3) ◽  
pp. d121-137 ◽  
Author(s):  
John W Ludlow
Keyword(s):  
Cell Cycle ◽  
Cell Cycle Regulation ◽  
Cycle Regulation
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