Key result
An 89-bp cardiac-specific sequence represses MLC-2 expression in skeletal muscle via specific protein binding.
Why the study?
The mechanism repressing cardiac MLC-2 gene expression in differentiated noncardiac muscle tissues was unknown.
Population
Primary skeletal muscle cells and cardiac muscle cells from chickens
Comparison
Sequential 5'-deletion mutants of cardiac MLC-2 promoter vs intact promoter
Design
Preclinical study using promoter deletion and protein binding assays
Authors
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May inform cardiac-specific transcriptional repression; leaves open in vivo conservation and disease relevance.
A negative regulatory mechanism involving an 89-bp upstream repressor element (CSS) restricts cardiac MLC-2 gene expression to cardiac tissue by repressing it in skeletal muscle.
Ruoqian-Shen et al. (1991) studied this question. 5'-deletion mutants of the cardiac MLC-2 promoter vs. Wild-type promoter / cardiac muscle cells was evaluated on Transcriptional activity and protein binding to CSS domain. An 89-bp cardiac-specific sequence (CSS) represses cardiac MLC-2 gene expression in skeletal muscle via a negative regulatory mechanism involving specific protein binding.
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