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Genetic changes associated with immortalization. A review

E L Duncan1, R R Reddel

  • 1Children's Medical Research Institute, Sydney, NSW, Australia.

Biochemistry. Biokhimiia
|February 19, 1998
PubMed
Summary
This summary is machine-generated.

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Human fibroblasts face three barriers to immortalization, including senescence. Overcoming these requires genetic changes beyond telomere maintenance, involving key genes like p53 and pRB.

Area of Science:

  • Cellular biology
  • Molecular genetics
  • Cancer research

Background:

  • Human fibroblasts exhibit three terminal proliferative arrest (TPA) states acting as barriers to cellular immortalization.
  • Senescence is the first identified TPA state, a critical checkpoint in cell aging.

Purpose of the Study:

  • To elucidate the genetic mechanisms and barriers governing human fibroblast immortalization.
  • To review the roles of p53, pRB, p16INK4, and telomere maintenance in overcoming cellular arrest.

Main Methods:

  • Analysis of gene function (p53, pRB, p16INK4) in fibroblast proliferation.
  • Investigation of cellular responses to genetic manipulation, including senescence, p53-minus TPA, and crisis.
  • Review of existing literature on genetic alterations during immortalization.

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Main Results:

  • Abrogation of p53 allows temporary escape from senescence, leading to a p53-minus TPA involving pRB and p16INK4.
  • Simultaneous abrogation of p53 and pRB (or p16INK4) permits proliferation until cells reach crisis.
  • Crisis is overcome via activation of telomere maintenance mechanisms.

Conclusions:

  • Cellular immortalization is a multifaceted process driven by numerous genetic alterations.
  • Telomere maintenance is crucial for overcoming crisis, but other genetic changes also contribute significantly to immortalization.