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Isolation and analysis of cellular DNA fragments directly binding to c-Myc protein
Abstract:
c-Myc protein, the product of cellular oncogene c-myc, is thought to play an important role in the control of cell cycle progression by binding to the E-box sequence (CACGTG) of cellular DNA, but only a few target genes are known. We cloned two small human DNA fragments (n16 and r37) that bound to c-Myc protein in vitro by random screening. Both clones contained the E-box sequence, to which c-Myc protein bound directly in vitro. Northern blot analysis showed that a low molecular-weight RNA was transcribed from the region near the n16 c-Myc binding site. The function of this low molecular-weight RNA and the regulatory role of c-Myc protein in related transcription are now under investigation.
Insights
Researchers identified novel human DNA fragments (n16 and r37) that bind to the c-Myc protein. These fragments contain E-box sequences, suggesting new targets for c-Myc in cell cycle regulation.
Area of Science:
- Molecular Biology
- Genetics
- Oncology
Background:
- The c-Myc protein, encoded by the cellular oncogene c-myc, is crucial for cell cycle control.
- c-Myc functions by binding to E-box sequences (CACGTG) in DNA.
- However, the full spectrum of c-Myc target genes remains largely unknown.
Purpose of the Study:
- To identify novel DNA sequences that interact with the c-Myc protein.
- To investigate potential new target genes regulated by c-Myc.
Main Methods:
- Random screening was employed to identify DNA fragments binding to c-Myc protein in vitro.
- DNA fragments (n16 and r37) were cloned and characterized.
- Northern blot analysis was used to detect RNA transcription near identified binding sites.
Main Results:
- Two human DNA fragments, n16 and r37, were successfully cloned due to their binding affinity to c-Myc protein.
- Both cloned fragments contain the E-box sequence, confirming direct in vitro binding of c-Myc.
- Northern blot analysis revealed transcription of a low molecular-weight RNA near the n16 binding site.
Conclusions:
- Novel c-Myc binding sites (n16 and r37) have been identified.
- The discovery suggests potential new mechanisms of c-Myc-mediated gene regulation.
- Further research is needed to elucidate the function of the identified RNA and c-Myc's regulatory role.