Key result
Expression of mutant alpha-tropomyosin (alpha-TM9aaDeltabeta) in transgenic mice reduced left ventricular pressure by 12% and time to peak pressure by 13% compared to nontransgenic controls.
Effect estimate: -12%
Altering the end-to-end interactions of tropomyosin molecules in the thin filament regulatory strand significantly impairs cardiac muscle contraction and relaxation in a transgenic mouse model.
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Should not inform clinical practice; leaves open whether alpha-TM mutations impair human LV function.
Gaffin et al. (2006) studied Cardiac muscle dynamics. alpha-TM9aaDeltabeta mutant expression vs. nontransgenic controls was evaluated on Left ventricular pressure (-12%). Expression of mutant alpha-tropomyosin (alpha-TM9aaDeltabeta) in transgenic mice reduced left ventricular pressure by 12% and time to peak pressure by 13% compared to nontransgenic controls.
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