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Two zinc-dependent steps during G1 to S phase transition
J K Chesters1, L Petrie, K E Lipson
1Rowett Research Institute, Bucksburn, Aberdeen, United Kingdom.
Journal of Cellular Physiology
|June 1, 1993
Summary
Low zinc availability impacts thymidine kinase mRNA levels, but not when regulated by the SV40 promoter. A second zinc-sensitive process affects cell cycle commitment to S phase.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Zinc is an essential trace element crucial for various cellular processes.
- Thymidine kinase plays a key role in DNA synthesis and cell proliferation.
- Gene expression regulation is vital for cellular response to nutrient availability.
Purpose of the Study:
- To investigate the effect of zinc (Zn) availability on thymidine kinase mRNA levels.
- To determine if zinc influences mRNA production through specific promoter elements.
- To identify other zinc-sensitive processes involved in cell cycle progression.
Main Methods:
- Utilized cells with thymidine kinase mRNA regulated by truncated promoters or the SV40 early promoter.
- Measured thymidine kinase mRNA concentrations under varying zinc availability.
- Assessed thymidine incorporation and histone H3 mRNA production in zinc-deprived cells.
Main Results:
- Low zinc availability decreased thymidine kinase mRNA levels with truncated promoters but not with the SV40 promoter.
- Despite SV40 promoter regulation, thymidine incorporation remained sensitive to zinc deficiency.
- Histone H3 mRNA production, essential for S phase, was not inhibited by zinc deficiency.
Conclusions:
- Zinc availability influences thymidine kinase mRNA levels, with promoter-specific effects.
- A zinc-sensitive step beyond mRNA production affects commitment to S phase.
- Cells adapt to zinc deficiency by increasing histone H3 mRNA, favoring DNA replication.