Key result
Titin spring region deletion increases passive stiffness, inducing diastolic dysfunction and reduced exercise tolerance.
Why the study?
The physiological role of the tandem immunoglobulin segment of titin in stiffness generation and its sufficiency to cause diastolic dysfunction were not established.
Population
Mouse model with deletion of 9 Ig-like domains in titin
Comparison
IG KO mice vs wild-type controls
Design
Experimental genetic mouse model study
Authors
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Titin domain deletion models warrant mechanistic follow-up in diastolic dysfunction; human relevance and therapeutic translation remain unproven.
Chung et al. (2013) studied Diastolic dysfunction. Deletion of 9 Ig-like domains (Ig3-Ig11) from titin (IG KO) vs. Wild-type/control mice was evaluated on Passive myocyte stiffness, diastolic stiffness, and exercise tolerance. Deletion of 9 Ig-like domains from the titin spring region in mice increased passive stiffness, causing diastolic dysfunction and reduced exercise tolerance.
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