Apoptosis: final common pathway of photoreceptor death in rd, rds, and rhodopsin mutant mice

Neuron. 1993 Oct;11(4):595-605. doi: 10.1016/0896-6273(93)90072-y.


Mutations in the retinal degeneration, retinal degeneration slow(/peripherin) and rhodopsin genes cause photoreceptor degeneration in humans and mice. Although the phenotypes arising from these mutations are different, suggesting different mechanisms of pathogenesis, we present evidence that apoptosis may be the final common pathway of the disease process linking genotype to phenotype. We observed internucleosomal cleavage of retinal DNA by gel electrophoresis and fragmented DNA at the single cell level by labeling the nicked DNA ends with biotinylated poly(dU). In retinal degeneration mice, DNA fragmentation occurred during the period of photoreceptor degeneration. In retinal degeneration slow mice and in transgenic mice expressing a mutant (Pro347Ser) rhodopsin gene, DNA fragmentation occurred after normal histogenetic cell death (also apoptosis) had ceased. Since DNA fragmentation by internucleosomal cleavage is a cardinal feature of apoptosis, our data suggest that all three of these genetic mutations lead to apoptosis.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Apoptosis / genetics*
  • DNA / isolation & purification
  • DNA / metabolism*
  • DNA Damage*
  • Mice
  • Mice, Inbred C57BL
  • Mice, Mutant Strains
  • Microscopy, Electron
  • Mutagenesis, Site-Directed
  • Photoreceptor Cells / pathology*
  • Photoreceptor Cells / ultrastructure
  • Retina / cytology
  • Retina / pathology
  • Retinal Degeneration / genetics*
  • Rhodopsin / genetics*


  • DNA
  • Rhodopsin