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Delayed internucleosomal DNA fragmentation in programmed cell death

Z F Zakeri1, D Quaglino, T Latham

  • 1Department of Biology, Queens College, CUNY, Flushing 11367.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|March 1, 1993
PubMed
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Programmed cell death in developing organisms does not always involve DNA fragmentation early on. DNA fragmentation is not a necessary component of developmental programmed cell death.

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Cell Biology

Background:

  • Programmed cell death (PCD) is crucial for development.
  • DNA fragmentation is often considered a hallmark of apoptosis.
  • The role of DNA fragmentation in developmental PCD is not fully understood.

Purpose of the Study:

  • To investigate DNA fragmentation during various forms of programmed cell death.
  • To determine if DNA fragmentation is an early or defining event in developmental PCD.

Main Methods:

  • Electron microscopy and Feulgen staining of nuclei.
  • Quantitative DNA content analysis in degenerating cells.
  • Ethidium bromide staining and radiolabeling ([3H]thymidine) for DNA fragmentation.
  • DNA end-labeling techniques.

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Main Results:

  • In Manduca sexta labial glands, DNA fragmentation was only detected late in cell death.
  • No DNA fragmentation ladder was observed in early stages of labial gland or mouse limb cell death.
  • WEHI 7.1 lymphoma cells showed DNA fragmentation after glucocorticoid treatment.
  • DNA fragmentation was not consistently observed in developmental PCD models.

Conclusions:

  • Endonuclease activation is not a trigger or necessary component of early developmental PCD.
  • The absence of DNA fragmentation in some developmental contexts may be due to limitations in detection methods or specific biological processes.
  • Developmental PCD may utilize mechanisms distinct from the classic apoptotic DNA fragmentation pathway.