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Identification of genes highly expressed in G2-arrested Chinese hamster ovary cells by differential display analysis
1The First Department of Internal Medicine, Sapporo Medical University School of Medicine, Hokkaido, Japan.
Abstract:
Abnormal cell cycle regulation is believed to be an important step in tumorigenesis. In mammalian cells, DNA damage commonly leads to cell cycle arrest in G2; however, little is known about the detailed biochemical mechanisms underlying the DNA damage-induced G2 arrest. In order to identify genes differentially expressed in association with G2 arrest, differential display analysis was performed between exponentially growing Chinese hamster ovary (CHO) cells and G2-arrested CHO cells induced by etoposide, SN-38, or X-radiation. We identified five cDNA clones whose expression was up-regulated in G2-arrested CHO cells. Sequence analysis revealed that three clones were homologous to known genes: isogene I of translation initiation factor eIF-4A, ribosomal protein L13, and translation repressor NAT1. The remaining two clones showed no homology to known genes. These results indicate that DNA damage can alter the expression of multiple genes, including translational regulators.
Insights
DNA damage triggers cell cycle arrest in G2 phase. This study identified new genes, including translational regulators, that are upregulated during G2 arrest in Chinese hamster ovary cells.
Area of Science:
- Cell Biology
- Molecular Biology
- Genetics
Background:
- Abnormal cell cycle regulation is a key factor in tumorigenesis.
- DNA damage typically induces G2 cell cycle arrest in mammalian cells.
- The precise biochemical mechanisms of DNA damage-induced G2 arrest are not fully understood.
Purpose of the Study:
- To identify genes differentially expressed during G2 arrest.
- To investigate the molecular response to DNA damage in mammalian cells.
Main Methods:
- Differential display analysis was used to compare gene expression.
- Chinese hamster ovary (CHO) cells were used for the study.
- G2 arrest was induced using etoposide, SN-38, or X-radiation.
Main Results:
- Five cDNA clones showed increased expression in G2-arrested cells.
- Three clones were identified as known genes: translation initiation factor eIF-4A, ribosomal protein L13, and translation repressor NAT1.
- Two novel genes with no known homology were also identified.
Conclusions:
- DNA damage significantly alters gene expression patterns.
- The study highlights the role of translational regulators in the DNA damage response.
- These findings contribute to understanding the mechanisms of G2 arrest and tumorigenesis.