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Systematic review and meta-analysis of MYH7 versus MYBPC3 variants in obstructive hypertrophic cardiomyopathySpecific heart genes predict different risks for HCM patients

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Key Takeaway
Note higher LVOT obstruction and AF risk in MYH7 carriers versus MYBPC3 carriers in obstructive HCM.

This systematic review and meta-analysis evaluated pathogenic sarcomeric variants in MYH7 versus MYBPC3 among carriers with obstructive hypertrophic cardiomyopathy. The analysis included 192,361 participants drawn from cohort or registry studies, including data from the UK Biobank and Mass General Brigham. The primary outcome was not reported, but secondary outcomes included age at presentation, severity of hypertrophy, left ventricular outflow tract obstruction, arrhythmic outcomes, incident atrial fibrillation, progressive systolic dysfunction, and interventricular septal thickness.

The pooled analysis showed higher odds of LVOT obstruction in MYH7 carriers with a pooled OR range of 1.95–4.30. Incident atrial fibrillation risk was increased in MYH7 carriers with a hazard ratio of 1.7 and a 95% CI of 1.1–2.6. Conversely, progressive systolic dysfunction showed an elevated risk in MYBPC3 carriers with an adjusted HR of 2.53 and a 95% CI of 1.09–5.82. Interventricular septal thickness was greater in MYH7 carriers with a mean difference of 1.30 mm and a 95% CI of 0.06–2.54.

The authors noted substantial heterogeneity with an I2 value of 80.7%, reflecting real-world differences in phenotype ascertainment. Safety data, including adverse events and tolerability, were not reported. The authors suggest these findings support the integration of genetic data into personalized surveillance strategies for carriers of these variants.

Imagine having a heart condition where two people with the same diagnosis face very different futures. One might face blockages while the other faces weakening muscle. This uncertainty is common for patients with hypertrophic cardiomyopathy.

Hypertrophic cardiomyopathy thickens the heart walls. It affects many people around the world. Doctors struggle to predict who gets sick faster. Some patients develop dangerous rhythm problems early. Others see their heart muscle weaken over time.

Why heart genes matter for your future

Doctors used to treat everyone the same. Now we know genes matter. A recent large study looked at how specific genetic changes affect the disease. They found that the type of gene mutation changes the path of the illness.

This is a big shift in how we view heart disease. It means one size does not fit all. We can now tailor care based on the specific genetic code.

How different mutations change heart risks

Think of genes like keys. Different keys open different doors in the heart. The study compared two main keys called MYH7 and MYBPC3.

People with the MYH7 key faced more blockages. They also had a higher risk of irregular heartbeats. This group often showed thicker heart walls.

People with the MYBPC3 key presented later in life. They faced a higher risk of the heart muscle weakening. This is called systolic dysfunction. It means the heart cannot pump blood well.

The research team looked at over 192,000 people. They combined data from ten different studies. This included a massive population sequencing cohort.

The results were clear and consistent. The MYH7 group had nearly double the odds of obstruction. They also had a 70 percent higher risk of atrial fibrillation.

The MYBPC3 group had a much higher risk of heart failure. Their heart muscle was more likely to decline over time.

This does not mean you need a genetic test today.

Why this news needs careful reading

But there is a catch. This study is a review of past data. It is not a new treatment trial. We do not have a pill or surgery to change the genes yet.

The findings help doctors plan better. They can watch for specific problems based on the gene. This allows for earlier intervention if needed.

Experts say this supports personalized surveillance strategies. It means checking for rhythm issues in one group. It means checking for pumping strength in the other.

What happens next for heart patients

This research is a step forward. It does not change care overnight. More work is needed to make this routine.

Doctors will need to integrate genetic data into their plans. This takes time and resources. It also requires more training for medical teams.

The goal is to help patients live better lives. Knowing the risk helps patients prepare. It helps families understand the condition better.

Future trials will test if this knowledge improves outcomes. We need to see if early action works. This study provides the map for that journey.

Research takes time to reach the clinic. But the path is now clearer. Patients and doctors can look ahead with more confidence. The future of heart care is becoming more personal.

Study Details

Study typeMeta analysis
EvidenceLevel 1
PublishedApr 2026
View Original Abstract ↓
BackgroundThe clinical course of obstructive hypertrophic cardiomyopathy (HCM) is highly variable. Whether this heterogeneity reflects mutation-specific clinical trajectories remains a pivotal question for prognostication and personalized management.ObjectivesThis study aimed to determine if pathogenic sarcomeric variants in MYH7 and MYBPC3 are associated with distinct clinical pathways in obstructive HCM, by comparing their associations with age at presentation, severity of hypertrophy, left ventricular outflow tract (LVOT) obstruction, and arrhythmic outcomes.MethodsWe conducted a systematic review and meta-analysis following PRISMA 2020 guidelines. Four databases were searched up to October 2025 for cohort or registry studies reporting on sarcomeric variants and quantitative phenotypes in obstructive HCM. Data were extracted independently in duplicate, and effect estimates were pooled as odds ratios (OR), mean differences (MD), or hazard ratios (HR) with 95% confidence intervals (CI).ResultsTen studies comprising 192,361 participants were included, encompassing a large population sequencing cohort (UK Biobank/Mass General Brigham) of 184,511 and nine clinical/registry cohorts totaling 7,850. Carriers of MYH7 variants presented with a more obstructive and arrhythmogenic phenotype, demonstrating higher odds of LVOT obstruction (pooled OR range: 1.95–4.30) and a 70% increased risk of incident atrial fibrillation (HR: 1.7, 95% CI: 1.1–2.6). In contrast, carriers of MYBPC3 variants, while often presenting later, faced a significantly elevated risk of progressive systolic dysfunction (adjusted HR: 2.53, 95% CI: 1.09–5.82). MYH7 was also associated with greater interventricular septal thickness (MD: 1.30 mm, 95% CI: 0.06–2.54). Substantial heterogeneity (I2 = 80.7%) was observed, reflecting real-world differences in phenotype ascertainment.ConclusionsThis analysis confirms that obstructive HCM follows mutation-specific clinical trajectories. Genotype provides critical prognostic insights, delineating an MYH7 driven path of early obstruction and arrhythmia from an MYBPC3 associated trajectory of long term systolic decline. These findings support the integration of genetic data into personalized surveillance strategies.
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