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TNNT2 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

TNNT2 gene

The TNNT2 gene provides instructions for creating cardiac troponin T, a protein that regulates the contraction and relaxation of heart muscle.

Normal Function

The TNNT2 gene provides instructions for making a protein called cardiac troponin T, which is found solely in the heart (cardiac) muscle. Cardiac troponin T is one of three proteins that make up the troponin protein complex in cardiac muscle cells. The troponin complex is part of a structure called the sarcomere, which is the basic unit of muscle contraction. Sarcomeres are made up of thick and thin filaments. The overlapping thick and thin filaments attach (bind) to each other and release, which allows the filaments to move relative to one another so that muscles can contract. The troponin complex, along with calcium, helps regulate contraction of cardiac muscle.

For the heart to beat normally, cardiac muscle must contract and relax in a coordinated way. Cardiac troponin T helps coordinate contraction of the heart muscle. When calcium levels are low, the troponin complex binds to the thin filament in sarcomeres, which blocks the interaction between the thick and thin filaments that is needed for muscle contraction. An increase in calcium levels causes structural changes in the troponin complex, which allows the thick and thin filaments to interact, leading to contraction of the heart muscle.

Health Conditions Related to Genetic Changes

Familial restrictive cardiomyopathy

MedlinePlus Genetics provides information about Familial restrictive cardiomyopathy.

Nonsyndromic dilated cardiomyopathy

MedlinePlus Genetics provides information about Nonsyndromic dilated cardiomyopathy.

Nonsyndromic hypertrophic cardiomyopathy

MedlinePlus Genetics provides information about Nonsyndromic hypertrophic cardiomyopathy.

Other Names for This Gene

  • cardiac muscle troponin T
  • cTnT
  • LVNC6
  • RCM3
  • TNNT2_HUMAN
  • TnTC
  • troponin T type 2 (cardiac)
  • troponin T, cardiac muscle
  • troponin T2, cardiac

Frequently Asked Questions

Early warning signs of cardiomyopathies linked to TNNT2 mutations can include shortness of breath, especially with exertion, fatigue, swelling in the legs or ankles, chest pain, dizziness, or fainting spells. Some individuals may not experience symptoms until the condition is advanced. If you notice any of these, especially with a family history of heart disease, consult a doctor.
Treatment for TNNT2-related cardiomyopathies focuses on managing symptoms, preventing complications, and improving heart function. This often involves medications such as beta-blockers, ACE inhibitors, or diuretics. Lifestyle modifications like dietary changes and exercise may also be recommended. In advanced cases, pacemakers, defibrillators, or even heart transplantation might be considered.
Diagnosis involves a thorough medical history, physical exam, and various cardiac tests. These may include an electrocardiogram (ECG) to check heart rhythm, an echocardiogram to visualize heart structure and function, and cardiac MRI for detailed imaging. Genetic testing for TNNT2 gene mutations can confirm the underlying cause, especially in cases with a family history of cardiomyopathy.
TNNT2-related cardiomyopathies are typically inherited in an autosomal dominant pattern. This means if one parent has the mutation, each child has a 50% chance of inheriting it. First-degree relatives (parents, siblings, children) of an affected individual are usually advised to undergo cardiac screening and genetic counseling to assess their risk and discuss potential monitoring or preventive measures.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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