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Papers In Press, published online ahead of print October 10, 2002
J. Biol. Chem, 10.1074/jbc.M206369200
Submitted on June 26, 2002
Revised on October 8, 2002
Accepted on October 10, 2002
Physiology and Biophysics, Case Western Reserve University, Cleveland, OH 44106-4970
Corresponding Author: jxj12{at}po.cwru.edu
Adult cardiac muscle normally expresses a single cardiac troponin T (cTnT). As a potential pathogenic mechanism for turkey dilated cardiomyopathy, the splice-out of a normally constitutive exon generates an additional low Mr cTnT with altered conformation and function. We further found that aberrant splicing of cTnT also occurs in several mammals correlating to dilated cardiomyopathy. Skipping of the same exon as that in the turkey was found in the canine cTnT. Splice-out of the adjacent exon 6 occurred in the guinea pig cTnT. Retention of the embryonic exon 5 was found in the cTnT of cat, dog and guinea pig. These aberrant splicing variants significantly altered the structure of cTnT to sustain functional effects as that in the myopathic turkey cTnT. Genomic sequence of canine cTnT gene shows no specific alterations. However, the alternative splicing patterns of canine cTnT are different in developing cardiac and skeletal muscles, suggesting abnormality of trans-regulatory factors. Transgenic expression of the aberrant cTnT variants resulted in contractile changes in mouse cardiomyocytes. The findings support the hypothesis that thin filament heterogeneity due to the co-expression of alternatively spliced cTnT variants may desynchronize myocardial contraction and contribute to the pathogenesis and pathophysiology of cardiomyopathy and heart failure.
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