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Inhibition of S-phase entry of human fibroblasts by an antisense oligomer against hCDC47
M Fujita1, T Kiyono, Y Hayashi
1Laboratory of Viral Oncology, Research Institute, Aichi Cancer Center, Chikusa-ku, Nagoya, Japan.
Abstract:
The MCM protein family has been implicated in the regulatory machinery causing DNA to replicate only once in the S phase. Recently, we have identified human (h) CDC47, another member of the family, and demonstrated its unique S-phase nuclear association pattern implying participation in the regulation of DNA replication. In the present study, we applied an antisense strategy to assess the phenotype of human cells in which hCDC47 is repressed. As a result serum-induced accumulation of hCDC47 protein in human fibroblast cells was reduced by a specific antisense oligodeoxynucleotide and S-phase entry of such cells was significantly inhibited, indicating that hCDC47 protein is essential for DNA replication.
Insights
Human CDC47 protein is crucial for DNA replication. Repressing its levels using antisense oligodeoxynucleotides significantly inhibited S-phase entry in human fibroblast cells, confirming its essential role.
Area of Science:
- Cell biology
- Molecular biology
- Genetics
Background:
- The MCM protein family regulates DNA replication timing during the S phase.
- Human CDC47 (hCDC47) was recently identified as a novel MCM family member.
- hCDC47 exhibits a unique S-phase nuclear localization pattern, suggesting a role in DNA replication control.
Purpose of the Study:
- To investigate the functional role of hCDC47 in DNA replication.
- To determine the cellular phenotype resulting from hCDC47 repression.
Main Methods:
- An antisense oligodeoxynucleotide strategy was employed to repress hCDC47 expression in human fibroblast cells.
- The effect of hCDC47 repression on S-phase entry was analyzed.
Main Results:
- Serum-induced accumulation of hCDC47 protein was significantly reduced by the antisense oligodeoxynucleotide.
- S-phase entry of hCDC47-repressed cells was markedly inhibited.
Conclusions:
- hCDC47 protein plays an essential role in regulating DNA replication.
- The repression of hCDC47 function prevents cells from entering the S phase, highlighting its critical involvement in the DNA replication process.