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Cardiomyopathy IV: Restrictive Cardiomyopathy01:29

Cardiomyopathy IV: Restrictive Cardiomyopathy

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Restrictive cardiomyopathy (RCM) is a rare heart muscle disease characterized by impaired ventricular filling due to stiffened ventricular walls, leading to significant diastolic dysfunction.EtiologyRestrictive cardiomyopathy can arise from both inherited and acquired diseases, many of which are systemic. It is categorized into four main types: infiltrative, storage, non-infiltrative, and endomyocardial diseases.Infiltrative diseases, such as amyloidosis, lead to RCM by depositing amyloid...
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Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
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Cardiomyopathy II: Dilated Cardiomyopathy01:30

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Dilated cardiomyopathy, or DCM, is a progressive myocardial disorder characterized by ventricular chamber dilation and contractile dysfunction.EtiologyVarious factors can cause DCM, including hypertension and heavy alcohol intake, which contribute to the weakening and enlargement of the heart muscle. Viral infections, such as Coxsackievirus B, adenoviruses, and influenza, can lead to DCM by causing inflammation and damage to heart tissue. Certain chemotherapeutic agents, including daunorubicin,...
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Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...
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Managing cardiomyopathy involves addressing underlying or precipitating causes, treating heart failure with medications, and implementing dietary changes and a balanced exercise and rest regimen.Lifestyle ModificationsCardiomyopathy patients should adopt a low-sodium diet to reduce fluid retention and manage heart failure. A personalized exercise and rest plan helps maintain physical fitness without overstraining the heart. Avoiding alcohol and tobacco is essential to prevent further damage to...
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Exon Utilization Improves Risk Stratification for Advanced Heart Failure in Titin Cardiomyopathy.

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    Area of Science:

    • Cardiovascular Genetics
    • Molecular Cardiology
    • Genomic Medicine

    Background:

    • Truncating variants in the titin (TTN) gene are the most frequent genetic cause of dilated cardiomyopathy (DCM).
    • The clinical severity and progression of DCM linked to TTN variants are influenced by gene expression levels, specifically the percent spliced in (PSI) of the affected exon.
    • Existing methods using short-read RNA sequencing (PSI-SR) may not fully capture the complexity of TTN isoform expression.

    Purpose of the Study:

    • To develop and validate a novel metric, PSI-LR, using long-read RNA sequencing to more accurately quantify TTN exon expression.
    • To assess the ability of PSI-LR to predict the risk of progression to advanced heart failure (AHF) in patients with TTN variants.
    • To establish a PSI-LR threshold for identifying patients at lower risk of AHF progression.

    Main Methods:

    • Long-read RNA sequencing was performed on cardiac tissue from organ donors and DCM patients to identify and quantify TTN isoforms.
    • A new metric, PSI-LR, was calculated based on long-read data, and compared to PSI-SR derived from short-read data.
    • A cohort of 98 DCM patients with TTN variants was analyzed to correlate PSI-LR and PSI-SR with the development of AHF (defined by need for LVAD or transplant).

    Main Results:

    • Long-read RNA sequencing identified 16 TTN isoforms and revealed that PSI-LR reclassified exon expression in 5% of cases compared to PSI-SR.
    • PSI-LR, but not PSI-SR, significantly predicted the risk of AHF progression in patients with TTN variants (OR 1.35 per 0.1 increase, p=0.038).
    • A PSI-LR threshold of less than 0.75 effectively identified patients who did not progress to AHF.

    Conclusions:

    • PSI-LR, a metric derived from long-read RNA sequencing, provides a more accurate assessment of TTN isoform expression relevant to DCM.
    • PSI-LR is a valuable predictive biomarker for assessing the risk of progression to advanced heart failure in individuals with TTN variants.
    • This improved prognostic tool has significant implications for the clinical management and monitoring of patients with TTN-related cardiomyopathy.