Related Experiment Video
Updated: Jan 23, 2026

Preparation of Mouse Retinal Cryo-sections for Immunohistochemistry
Published on: July 1, 2019
Clyde E. Keeler: The Rodless Mouse and the Early Days of Retinal Genetic Research
1Casey Eye Institute, Portland, Oregon.
Purpose:
To report the lifetime activities and accomplishments of Clyde E. Keeler (1900-1994), a pioneer in the study of retinal genetics.
Design:
Retrospective review.
Methods:
Assessment of published and unpublished biographical material.
Results:
Nearly a century ago, Keeler discovered an inherited abnormality in the mouse that causes the absence of rod photoreceptors and is the mouse counterpart of 1 type of human retinitis pigmentosa.
Conclusions:
In 1923, Keeler serendipitously discovered the so-called rodless mouse, which is now known to be the result of a mutation in the PDEGB gene. The historical name for the mouse strain is rd. This same defect was reported in human patients with retinitis pigmentosa in 1993. Keeler's mouse model is still used in gene therapy studies seeking to cure retinitis pigmentosa.
Related Concept Videos
Genetics of Speciation
What is Population Genetics?
What is Genetic Engineering?
Animal Mitochondrial Genetics
Types of Genetic Transfer Between Organisms
Mutation, Gene Flow, and Genetic Drift

