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Cytogenesis in the monkey retina.

M M La Vail1, D H Rapaport, P Rakic

  • 1Department of Anatomy, University of California, School of Medicine, San Francisco 94143-0730.

The Journal of Comparative Neurology
|July 1, 1991
PubMed
Summary
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Rhesus monkey retina cell genesis occurs primarily before birth, starting around embryonic day 27 and concluding by postnatal week several. Cell birth follows a central-to-peripheral gradient, with distinct temporal phases for different cell types.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Ophthalmology

Background:

  • The precise timing and sequence of retinal cell generation are crucial for understanding visual system development.
  • Previous studies have established general timelines for retinal neurogenesis in various species.
  • Detailed spatiotemporal mapping of cell birth in the primate retina remains essential for comparative analysis.

Purpose of the Study:

  • To precisely map the temporal origin and spatial distribution of different retinal cell types in the rhesus monkey.
  • To identify distinct phases and gradients in retinal cell genesis during embryonic and early postnatal development.
  • To establish a detailed timeline of cell birth for ganglion, horizontal, cone, amacrine, bipolar, Müller, and rod cells.

Main Methods:

Related Experiment Videos

  • Autoradiography using 3H-thymidine pulse labeling in rhesus monkeys at various embryonic and postnatal ages.
  • Quantitative analysis of radiolabeled nuclei in retinal sections to determine cell origin timing.
  • Mapping the spatial distribution of labeled cells from central to peripheral retina.

    • Main Results:

    • Retinal cell genesis begins shortly after embryonic day 27, with 96% of cells generated by embryonic day 120.
    • Cell birth initiates centrally (near the fovea) and progresses peripherally.
    • Two distinct phases of cell generation were observed: an earlier phase (ganglion, horizontal, cone cells) and a later phase (amacrine, bipolar, Müller, rod cells).
    • Specific temporal windows and central-to-peripheral gradients were identified for each cell class.

    Conclusions:

    • Retinal cell generation in rhesus monkeys is a protracted process with distinct temporal and spatial characteristics.
    • The observed two-phase generation pattern and central-to-peripheral gradient provide insights into the developmental organization of the primate retina.
    • This study offers a detailed spatiotemporal map of retinal neurogenesis in a primate model, valuable for comparative developmental neuroscience.