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“When my result came back, I felt completely alone. Finding people who truly understood changed everything.”
Maria, 47
Living with the MYH7 cardiomyopathy gene
“My diagnosis explained my family history, and let me take action to protect my kids.”
Christy Johnson
Living with a DSP cardiomyopathy gene
“The community answered questions I didn’t even know how to ask. I finally feel in control.”
James, 34
Caregiver to father with TTN cardiomyopathy gene
Your TNNC1 quick-start guide
You don’t need to figure everything out today. Here’s what matters now and where to find support.
What you can do right now
Join the TNNC1 email list. New TNNC1 trials and findings are emerging quickly. Fill out the form below to receive updates about future research and clinical trial opportunities.
Connect With Others: You don’t have to process this alone. Join the TNNC1 Cardiomyopathy Facebook community to ask questions, share experiences, and hear from others on the same path.
Learn Through Video. Watch our videos below and subscribe to our YouTube channel.
Talk With Someone Who’s Been There. Not sure where to start? Email us with your questions.
Learn More:
Explore these trusted organizations for additional information and support:
- DCM Foundation: Learn more about dilated cardiomyopathy, inherited heart disease, patient education, and support resources.
- SADS Foundation: Learn more about heart rhythm disorders, inherited arrhythmias, family screening, and patient support.
- HeartCharged – Learn more about inherited heart conditions through patient stories, education, advocacy, and support.
Building your care plan
Find a Specialist. Connect with a Cardiomyopathy Specialist for guided care.
Establish a Baseline. Your care team may recommend an echocardiogram, EKG, and/or other tests.
Consider Genetic Counseling. A genetic counselor can help you better understand your genetic testing result, what it means for your health, and how to approach conversations with family members who may want to be tested.
Support Your Heart Health. Care for your heart through diet, exercise, lifestyle, and emotional well-being, including blood-pressure management. Pro tip: Improve just one thing at a time until you’ve made a sustainable shift.
Take these resources with you:
Download and print the Doctor Discussion Guide to help you feel organized and confident as you navigate your diagnosis.
Understanding the TNNC1 Gene
The Heart’s Contraction Control System
The TNNC1 gene provides instructions for making cardiac troponin C, one of the proteins that helps regulate heart muscle contraction. Troponin C binds calcium during each heartbeat, helping coordinate the interaction between the heart’s contractile proteins so the heart can contract and relax normally.
What happens when TNNC1 is not working properly?
When cardiac troponin C is not functioning as it should, the heart muscle’s response to calcium can become altered. Over time, this may affect how efficiently the heart contracts and relaxes, increasing the risk of:
- Hypertrophic cardiomyopathy (HCM)
- Dilated cardiomyopathy (DCM)
- Restrictive cardiomyopathy (RCM)
- Heart rhythm abnormalities (arrhythmias)
- Heart failure
The age at which symptoms begin and the severity of disease can vary considerably from person to person. Some individuals experience only mild symptoms, while others may develop more significant heart muscle disease requiring ongoing specialized care.
What this means for your care
Because TNNC1-related cardiomyopathy can progress over time, regular monitoring and specialized care are especially important. Your healthcare team may recommend routine heart imaging, rhythm monitoring, medications, an implantable cardioverter-defibrillator (ICD) when appropriate, or referral to an advanced heart failure or transplant center if needed.
Because TNNC1-related cardiomyopathy is usually genetic, your family members may also benefit from genetic counseling and testing. In most families, parents, siblings, and children each have up to a 50% chance of carrying the same disease-causing variant. However, the exact pattern can vary. Your genetic counselor can help clarify what this means for your relatives. Click here for practical tips on talking with your family members about your genetic results.
You did not cause this. Genetic variations are a natural part of human biology. Knowing this information now gives you and your care team a powerful tool to protect your heart health and guide your long‑term care.
Why Specialized Care Matters
Because TNNC1 variants are unique, your care should be too. While a general cardiologist is a great starting point, managing TNNC1-related cardiomyopathy typically requires a cardiomyopathy genetics specialist experienced in caring for patients with inherited heart conditions.
To find a cardiomyopathy specialist, please click here.
Connection & Support for TNNC1 Cardiomyopathy Patients
You are part of a supportive community.
“Finding the TNNC1 result felt like finally getting the owner’s manual for my heart.”
If you would like to connect with others, you can join our private TNNC1 Cardiomyopathy Facebook community to ask questions, share experiences, and hear from others walking a similar path.
TNNC1 Clinical Trials & Research
Progress in this field is steady and continually evolving. We currently know of more than 30 companies that are working on potential new cardiomyopathy therapies (mostly gene-specific), but many have not reached the clinical trial phase yet. We encourage you to visit our clinical trials and research page to view available opportunities that might be right for you.
Be sure to fill out the form below so that we can contact you when we know of any relevant trials or research opportunities. Staying connected means you remain part of the progress, even before specific clinical trials or research studies exist.
Frequently asked questions about TNNC1 Cardiomyopathy
What is the TNNC1 gene?
The TNNC1 gene provides instructions for making cardiac troponin C, a protein that helps the heart muscle respond to calcium and contract with each beat. Certain disease-causing TNNC1 variants can change how that process works and lead to cardiomyopathy. A genetic counselor can help explain what your specific result means.
What types of cardiomyopathy are linked to TNNC1?
Disease-causing TNNC1 variants have been linked to hypertrophic cardiomyopathy (HCM), in which the heart muscle becomes thickened, and dilated cardiomyopathy (DCM), in which the heart becomes enlarged and weakened. The type and severity can differ between people, including relatives with the same variant.
What symptoms should I tell my care team about?
Tell your care team about shortness of breath, chest discomfort, a racing or irregular heartbeat, dizziness, fainting, or a change in your ability to exercise. Some people have few symptoms even when heart changes are present, so keep the follow-up appointments your specialist recommends.
Does finding a TNNC1 variant mean I have cardiomyopathy?
It depends on how the variant is classified and what your heart evaluation shows. A pathogenic or likely pathogenic variant may help explain a diagnosis or indicate a need for monitoring. A variant of uncertain significance (VUS) does not, by itself, establish that the variant causes disease. Review the result with a genetic counselor before drawing conclusions about your health or your family’s risk.
Should my family members have genetic testing?
If you have a pathogenic or likely pathogenic TNNC1 variant, a genetic counselor can help identify relatives who may benefit from targeted testing and heart screening. TNNC1-related cardiomyopathy is generally inherited in an autosomal dominant pattern: each child of a person with a disease-causing variant has a 50% chance of inheriting it. Inheriting the variant does not predict exactly how the condition will affect them.
What follow-up care might I need?
Your care team may recommend regular visits, heart imaging such as an echocardiogram, an electrocardiogram (ECG), or heart rhythm monitoring. The plan depends on your diagnosis, symptoms, family history, and test results. Ask your cardiomyopathy specialist what changes you should report between appointments.
Where can I connect with others affected by TNNC1 cardiomyopathy?
GCAC’s TNNC1 support group offers a place for patients and families to share experiences and find support.
Join the TNNC1 community
You are part of a supportive community.
Be the first to know about new research, clinical trials, and helpful resources for people and families affected by the TNNC1 variant.