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Troponin I, fast skeletal muscle is a protein that in humans is encoded by the TNNI2 gene. [5] [6]The TNNI2 gene is located at 11p15.5 in the human chromosomal genome, encoding the fast twitch skeletal muscle troponin I (fsTnI). fsTnI is a 21.3 kDa protein consisting of 182 amino acids including the first methionine with an isoelectric point (pI) of 8.74.
Troponin T (blue) anchors the complex on tropomyosin. Troponin is found in both skeletal muscle and cardiac muscle, but the specific versions of troponin differ between types of muscle. The main difference is that the TnC subunit of troponin in skeletal muscle has four calcium ion-binding sites, whereas in cardiac muscle there are only three.
Cardiac muscle troponin T (cTnT) is a protein that in humans is encoded by the TNNT2 gene. [ 5 ] [ 6 ] Cardiac TnT is the tropomyosin -binding subunit of the troponin complex, which is located on the thin filament of striated muscles and regulates muscle contraction in response to alterations in intracellular calcium ion concentration.
Test Sensitivity and specificity Approximate peak Description Troponin test: The most sensitive and specific test for myocardial damage. Because it has increased specificity compared with CK-MB, troponin is composed of 3 proteins- Troponin C, Cardic troponin I, and Cardiac troponin T. Troponin I especially has a high affinity for myocardial injury.
[5] [6] [7] It is a tissue-specific subtype of troponin I, which in turn is a part of the troponin complex. Gene TNNI1 , troponin I type 1 (skeletal muscle, slow), also known as TNN1 and SSTNI , is located at 1q31.3 in the human chromosomal genome, encoding the slow twitch skeletal muscle isoform of troponin I (ssTnI), the inhibitory subunit of ...
Fetal Troponin T is a cardiac protein found in adults and infants. There are 4 Troponin T (TnT) isoforms found in fetal cardiac muscle. TnT1 and TnT2 which are also found in adult cardiac muscle. TnT1 are present along with two other isoforms. One of the other isoforms, a fetal cardiac TnT isoform, is also found in the fetal skeletal muscle.
Troponin I is a biomarker that responds to treatment interventions. Reductions in troponin I levels proved to reduce the risk of future CVD. [23] [24] [25] High sensitive troponin I used as a screening tool to assess a person's cardiovascular risk and has the potential to reduce the growing cost burden of the healthcare system. [26]
Slow skeletal muscle troponin T (sTnT) is a protein that in humans is encoded by the TNNT1 gene. [5] [6]The TNNT1 gene is located at 19q13.4 in the human chromosomal genome, encoding the slow twitch skeletal muscle isoform of troponin T (ssTnT). ssTnT is an ~32-kDa protein consisting of 262 amino acids (including the first methionine) with an isoelectric point (pI) of 5.95.