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Decrease of DNA per cell during development of the lens in chickens.

A Yamamoto1, T Araki, M F Counis

  • 1Department of Anatomy, School of Medicine, University of Tokushima, Japan.

Histochemistry
|January 1, 1990
PubMed
Summary
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Chicken lens development involves changes in DNA amount and conformation. DNA content in fiber cells decreases, while overall cell fluorescence increases, suggesting structural alterations during growth.

Area of Science:

  • Ophthalmology
  • Developmental Biology
  • Molecular Biology

Background:

  • The chicken lens undergoes significant cellular differentiation during development.
  • Understanding DNA changes is crucial for comprehending lens development and potential age-related alterations.

Purpose of the Study:

  • To investigate developmental changes in DNA amount and conformation within chicken lens cells.
  • To correlate observed DNA alterations with cellular differentiation processes in the developing lens.

Main Methods:

  • Microfluorometry using Hoechst 33258 (Hoe) fluorochrome was employed to analyze DNA in situ within chicken lens nuclei.
  • Differential staining protocols (1 M NaCl-aided vs. NaCl-free) were used to assess both DNA quantity and conformation.

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Main Results:

  • A decrease in DNA fluorescence intensity was observed in lens fiber cells during development using 1 M NaCl-aided staining, indicating a reduction in DNA amount.
  • Conversely, NaCl-free staining revealed a gradual increase in lens cell fluorescence intensity throughout development, suggesting alterations in DNA conformation.
  • Lens epithelial cells showed no significant change in DNA fluorescence intensity under either staining condition.

Conclusions:

  • The amount of DNA in chicken lens fiber cells decreases during development.
  • These reductions in DNA amount are associated with concurrent changes in DNA conformation within the developing lens.
  • These findings provide insights into the molecular mechanisms underlying lens development and cellular maturation.