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Strain-dependent neurodevelopmental abnormalities in caspase-3-deficient mice
Jeffrey R Leonard1, Barbara J Klocke, Cleta D'Sa
1Department of Pathology and Immunology, Washington University School of Medicine, St Louis, Missouri 63110, USA.
Journal of Neuropathology and Experimental Neurology
|August 3, 2002
Summary
Genetic background significantly impacts caspase-3 deficiency effects on brain development. Pure C57BL/6J mice show minimal pathology, while 129X1/SvJ mice exhibit severe neurodevelopmental defects, indicating crucial genetic modifiers.
Area of Science:
- Neuroscience
- Developmental Biology
- Genetics
Background:
- Caspase family members regulate programmed cell death in neurons.
- Caspase-3 and caspase-9 deficiencies in mice cause variable neurodevelopmental issues.
- Previous studies used mixed genetic backgrounds, possibly confounding results.
Purpose of the Study:
- To investigate the influence of genetic background on caspase-3 deficiency-induced neurodevelopmental phenotypes.
- To determine if strain-specific factors modify the effects of caspase-3 deficiency.
Main Methods:
- Backcrossing caspase-3 mutation onto pure C57BL/6J and 129X1/SvJ genetic backgrounds (7-10 generations).
- Phenotypic analysis of caspase-3 deficient mice on pure and mixed backgrounds.
- Intercrossing C57BL/6J and 129X1/SvJ caspase-3 mutants.
Main Results:
- Caspase-3 deficient 129X1/SvJ mice displayed severe perinatal lethality, neural precursor expansion, and exencephaly.
- Caspase-3 deficient C57BL/6J mice reached adulthood with minimal brain pathology.
- F1 offspring from intercrosses predominantly showed the severe 129X1/SvJ-like phenotype.
Conclusions:
- Incompletely penetrant, strain-dependent genetic modifiers significantly alter the neurodevelopmental consequences of caspase-3 deficiency.
- These modifiers may involve caspase-independent cell death pathways or compensatory caspase regulation.
- Genetic background is a critical factor in studying caspase-related neurodevelopmental disorders.