Key result
Reconstituted fibers containing fetal cTnT1 with ssTnI showed increased Ca2+ sensitivity and maximal force compared to adult cTnT3, indicating distinct functional properties of N-terminal TnT isoforms.
Population
Reconstituted fibers and troponin complexes containing cardiac troponin T isoforms and human slow skeletal…
Comparison
Cardiac troponin T isoforms vs Comparison among different cTnT isoforms
Design
Preclinical
Authors
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No immediate clinical implications; leaves open whether N-terminal cTnT isoforms affect human cardiac development or disease.
Different N-terminal cTnT isoforms produce distinct functional properties in the presence of ssTnI, suggesting specific physiological roles in cardiac muscle development.
Gomes et al. (2004) studied this question. Cardiac troponin T (cTnT) isoforms (cTnT1, cTnT4) vs. cTnT3 (adult isoform) was evaluated on Ca2+ sensitivity of force development, maximal force, and actomyosin ATPase activity. Reconstituted fibers containing fetal cTnT1 with ssTnI showed increased Ca2+ sensitivity and maximal force compared to adult cTnT3, indicating distinct functional properties of N-terminal TnT isoforms.
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