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Related Experiment Videos

cDNA clones contain autonomous replication activity

C Wu1, P Friedlander, C Lamoureux

  • 1McGill Cancer Center, McGill University, Montréal, Canada.

Biochimica Et Biophysica Acta
|September 23, 1993
PubMed
Summary
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Certain human gene transcripts, particularly those with O-family sequences, can drive autonomous DNA replication in human cells. This finding offers new insights into transcription

Area of Science:

  • Molecular Biology
  • Genetics
  • Mammalian Cell Biology

Background:

  • Transcription plays a crucial role in regulating gene expression and cellular processes.
  • Understanding the interplay between transcription and DNA replication is vital for comprehending genome stability and function.
  • Previous research has explored various elements involved in DNA replication origins, but the role of specific transcripts remains an area of active investigation.

Purpose of the Study:

  • To investigate whether specific RNA transcripts can support autonomous DNA replication in mammalian cells.
  • To identify sequence and structural features within these transcripts that may be associated with replication activity.
  • To explore the potential role of transcription as a regulatory mechanism in DNA replication.

Main Methods:

Related Experiment Videos

  • Construction of a cDNA library from human embryo lung fibroblasts (IMR90).
  • Transfection of selected cDNA clones into human cells (HeLa) to assess autonomous replication.
  • Sequence analysis of cDNA clones exhibiting replication activity to identify conserved motifs and structural elements.

Main Results:

  • Two of three 'O'-family repetitive sequence-containing cDNA clones demonstrated autonomous replication in HeLa cells.
  • None of the tested Alu-containing transcripts supported autonomous replication.
  • Six out of ten cDNA clones lacking 'O'-family or Alu sequences also efficiently supported autonomous replication, with some containing consensus sequences associated with replication origins (e.g., yeast ARS, SAR).

Conclusions:

  • Specific human RNA transcripts, particularly those with 'O'-family sequences, can confer autonomous replication ability to plasmids in mammalian cells.
  • The presence of yeast ARS and SAR consensus sequences may not be universally essential for autonomous replication in mammalian cells, as indicated by replication-competent clones lacking these features.
  • This study highlights a potential regulatory role for transcription in mammalian DNA replication.