This is a proposal to study mechanisms of gene regulation during the mammalian cell cycle using the histone and the cellular thymidine kinase genes as model systems. The major goal of this proposal is to carry out an in-depth analysis of the cis-acting DNA sequence and the trans-acting factors required for the cell cycle regulated gene expression in vivo. Recently, it has been demonstrated that sequences flanking the mammalian histone genes can confer transcriptional control on heterologous fusion genes, resulting in cell cycle regulation of their mRNA levels. In this proposal, the sequences around the histone gene will be subjected to in vitro mutagenesis. A series of recombinants will be transfected into recipient mammalian cells and the effect of deletions on the cell cyclic transcriptional control will be examined. This approach has been used successfully to define domains of DNA critical for regulatory function. Similar analysis of the cellular thymidine kinase gene will be performed with techniques already established for the histone gene system. Our focus is to dissect the transcriptional regulatory component of the thymidine kinase gene system. From our deletion analysis, we will determine if a consensus sequence for cell cycle regulatory sequence can be identified. In addition, we will test if cell cycle regulatory element has enhancer-like properties. For the characterization of the cellular factors involved in the cell cycle regulation, deletion mutant constructs will be transfected into mammalian recipient cells to probe if the factors act in a positive or negative manner. Competition experiments will be performed to confirm the regulatory nature of the factors, and to determine their relative binding affinities, concentrations during the cell cycle and their specificity toward other cell cycle regulated genes. Binding assays of the DNA and protein fractions extracted from dividing and G1 arrested cells will further identify the DNA regions capable of interacting with the protein factors and provide for assay systems towards their purification. This research will contribute to our knowledge of co-ordinate gene control during the mammalian cell cycle. Consequently, it may prove useful in understanding diseases, such as cancer, that may result from aberrations of gene expression during the cell cycle.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM031138-06
Application #
3279072
Study Section
Molecular Biology Study Section (MBY)
Project Start
1982-09-30
Project End
1992-04-30
Budget Start
1989-05-01
Budget End
1990-04-30
Support Year
6
Fiscal Year
1989
Total Cost
Indirect Cost
Name
University of Southern California
Department
Type
Schools of Medicine
DUNS #
041544081
City
Los Angeles
State
CA
Country
United States
Zip Code
90033
Wu, Frank; Lee, Amy S (2002) CDP and AP-2 mediated repression mechanism of the replication-dependent hamster histone H3.2 promoter. J Cell Biochem 84:699-707
Wu, F; Lee, A S (2001) YY1 as a regulator of replication-dependent hamster histone H3.2 promoter and an interactive partner of AP-2. J Biol Chem 276:28-34
Lau, J S; Baumeister, P; Kim, E et al. (2000) Heterogeneous nuclear ribonucleoproteins as regulators of gene expression through interactions with the human thymidine kinase promoter. J Cell Biochem 79:395-406
Naeve, G S; Zhou, Y; Lee, A S (1995) Identification of a 68 kDa protein species as a specific DNA-binding component of the H3abp complex interacting with the histone H3.2 G1/S regulatory domain. Nucleic Acids Res 23:475-84
Li, L J; Naeve, G S; Lee, A S (1993) Temporal regulation of cyclin A-p107 and p33cdk2 complexes binding to a human thymidine kinase promoter element important for G1-S phase transcriptional regulation. Proc Natl Acad Sci U S A 90:3554-8
Naeve, G S; Sharma, A; Lee, A S (1992) Identification of a 10-base pair protein binding site in the promoter of the hamster H3.2 gene required for the S phase dependent increase in transcription and its interaction with a Jun-like nuclear factor. Cell Growth Differ 3:919-28
Kim, Y K; Lee, A S (1992) Identification of a protein-binding site in the promoter of the human thymidine kinase gene required for the G1-S-regulated transcription. J Biol Chem 267:2723-7
Kim, Y K; Lee, A S (1991) Identification of a 70-base-pair cell cycle regulatory unit within the promoter of the human thymidine kinase gene and its interaction with cellular factors. Mol Cell Biol 11:2296-302
Kim, Y K; Wells, S; Lau, Y F et al. (1988) Sequences contained within the promoter of the human thymidine kinase gene can direct cell-cycle regulation of heterologous fusion genes. Proc Natl Acad Sci U S A 85:5894-8
Lee, A S; Wells, S; Delegeane, A M (1986) Methylation analysis of a plasmid containing a mammalian cell cycle regulatory sequence after transient transfection into the host cell. Biochem Biophys Res Commun 135:942-9

Showing the most recent 10 out of 11 publications