Population
Transgenic mice overexpressing gamma- actin in skeletal muscle, and alpha- actin-null mice (Acta1)
Comparison
Transgenic overexpression of gamma-(cyto) actin vs Wild-type mice and non-transgenic Acta1(-/-) mice
Design
Preclinical
Key result
Transgenic overexpression of gamma-cytoplasmic actin restored total actin levels but did not extend the life span of alpha-skeletal actin-null mice, indicating it cannot fully substitute for alpha-actin.
Authors
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Gamma-actin cannot rescue alpha-actin null lethality despite restoring levels; leaves open isoform-specific sarcomere roles in muscle disease models.
Sarcomeric thin filaments can accommodate substantial incorporation of gamma-(cyto) actin without functional consequences, but it cannot fully substitute for alpha-(sk) actin to prevent lethality.
Jaeger et al. (2009) studied alpha-(sk) actin-null (Acta1(-/-)). Transgenic overexpression of gamma-(cyto) actin vs. Wild-type mice and Acta1(-/-) mice without transgene was evaluated on Life span / early postnatal lethality. Transgenic overexpression of gamma-cytoplasmic actin restored total actin levels but did not extend the life span of alpha-skeletal actin-null mice, indicating it cannot fully substitute for alpha-actin.
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