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Reliable, easy-to-read patient information on common medical conditions — written in plain language, free of jargon, and grounded in current evidence. Browse the most frequent diagnoses, understand what they mean for everyday life, and learn which steps and questions help you have a focused conversation with your doctor.

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Troponin I

Introduction

Troponin
Overview

Overview

Troponin I is a part of the troponin complex. It binds to actin in thin myofilaments to hold the troponin-tropomyosin complex in place. The letter I is given due to its inhibitory character.

The tissue specific subtypes are:

  • Slow-twitch skeletal muscle isoform troponin I, TNNI1 (1q31.3, 191042)
  • Fast-twitch skeletal muscle isoform troponin I, TNNI2 (11p15.5, 191043)
  • Cardiac troponin I, TNNI3 (19q13.4, 191044)
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Cafer Zorkun, M.D., Ph.D. [2]