A Single Serine in the Carboxyl Terminus of Cardiac Essential Myosin Light Chain-1 Controls Cardiomyocyte Contractility In Vivo

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Structured PICO

Population

Zebrafish mutant lazy susan (laz) model with a nonsense mutation in the cmlc-1 gene leading to carboxyl-terminally truncated cMLC-1

Intervention

Overexpression of wild-type cMLC-1, cMLC-1(S195A) (serine 195-deficient), or cMLC-1(S195D) (phosphomimetic)

Comparator

Unrescued laz mutant zebrafish

Outcome

Cardiomyocyte contractility and cardiac sarcomerogenesissurrogate

The carboxyl terminus of cMLC-1, specifically serine 195, plays an essential role in regulating cardiac contractility in vivo.

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Highlights cMLC-1 carboxyl terminus in contractility; extends animal model insights but leaves open human therapeutic translation.

Meder et al. (2009) studied this question.

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