Visually evoked eye movements in mouse mutants and inbred strains. A screening report
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Abstract:
The authors screened various inbred strains and mutants of the mouse, Mus musculus, for qualitatively abnormal or reduced numbers of optokinetic nystagmus (OKN) eye movements. Thirteen hypopigmentation mutants and ten neuromuscular mutants were found to have abnormal or markedly reduced OKN, but none of these mutants had retinal degeneration. Ten other hypopigmentation mutants and nine other neuromuscular mutants had relatively normal OKN, thus showing that neither hypopigmentation nor neuromuscular abnormality per se are well-correlated with abnormal OKN. These findings show that many mutants with visual defects are available from existing holdings. These visual mutants may serve as a resource for the study of the function and development of the mammalian visual system.
Insights
Researchers screened mouse mutants for abnormal eye movements, finding many with visual defects. These identified visual mutants offer a valuable resource for studying mammalian vision development and function.
Area of Science:
- Neuroscience
- Genetics
- Ophthalmology
Background:
- Optokinetic nystagmus (OKN) is a crucial reflex for visual-motor control in mammals.
- Identifying genetic models with visual impairments is essential for understanding visual system development and function.
Purpose of the Study:
- To screen existing mouse mutants for abnormalities in optokinetic nystagmus (OKN).
- To identify and characterize visual mutants as a resource for future research.
Main Methods:
- Screening of various inbred strains and mutants of Mus musculus.
- Qualitative and quantitative assessment of optokinetic nystagmus (OKN) eye movements.
- Categorization of mutants based on hypopigmentation and neuromuscular phenotypes.
Main Results:
- Thirteen hypopigmentation and ten neuromuscular mutants exhibited abnormal or reduced OKN.
- No retinal degeneration was observed in the mutants with abnormal OKN.
- Ten hypopigmentation and nine neuromuscular mutants showed normal OKN, indicating these traits are not direct indicators of abnormal OKN.
Conclusions:
- A significant number of existing mouse mutants display visual defects, specifically in OKN.
- These identified visual mutants represent a valuable resource for investigating the mammalian visual system.
- Further research using these mutants can elucidate the function and development of visual pathways.