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Related Experiment Videos

CpG islands and double-minute chromosomes

R Rizwana1, P J Hahn

  • 1Department of Radiation Oncology, State University of New York Health Science Center, Syracuse 13210, USA.

Genomics
|September 2, 1998
PubMed
Summary

Double-minute chromosomes (DMs) amplify oncogenes by carrying amplified DNA. Common hypomethylated GC-rich regions in DMs suggest their role in DM formation during cancer development.

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CpG methylation reduces genomic instability.

Journal of cell science·1999

Area of Science:

  • Genetics
  • Cancer Biology
  • Molecular Oncology

Background:

  • Double-minute chromosomes (DMs) are extrachromosomal elements frequently observed in human tumors.
  • DMs are known to harbor amplified oncogenes, contributing to tumorigenesis.
  • The precise genomic organization and formation mechanism of DMs remain incompletely understood.

Purpose of the Study:

  • To investigate the genomic organization of DNA within double-minute chromosomes (DMs).
  • To identify common structural features, specifically CpG island locations, across independently isolated DMs.
  • To explore the potential role of hypomethylated GC-rich regions in DM genesis.

Main Methods:

  • Comparative mapping of CpG island locations in four independently isolated DMs amplifying the DHFR gene.
  • Cleavage with methylation-sensitive rare-cutting restriction endonucleases to identify hypomethylated regions.
  • Use of DM-specific probes to define the amplified core genomic region.

Main Results:

  • Three common hypomethylated GC-rich DNA sequences were identified in specific regions within the DMs.
  • One hypomethylated zone was located in the CpG island of the promoter region between DHFR and Rep-3 genes.
  • An approximately 800-kb core amplified region containing the DHFR gene was identified, with additional unique DNA fragments in each DM.

Conclusions:

  • The presence of common hypomethylated GC-rich sites in similar locations across different DMs suggests their involvement in DM formation.
  • CpG islands and their associated hypomethylated states may play a critical role in the genesis of double-minute chromosomes.
  • These findings provide insights into the structural organization and potential origin of extrachromosomal elements in cancer.

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