Video Experimental Relacionado
Updated: Mar 10, 2026
08:19
In Vitro Assessment of Cardiac Function Using Skinned Cardiomyocytes
Published on: June 22, 2020
7.2K
Una ruptura en la cooperación conduce a una crisis de identidad cardíaca
Ana Vujic1, Ahmed I Mahmoud1, Richard T Lee1
1Department of Stem Cell and Regenerative Biology and the Harvard Stem Cell Institute, Harvard University, Cambridge, MA 02138, USA.
Cell
|December 17, 2016
Resumen
Una mutación en el gen GATA4 causa enfermedad cardíaca congénita al interrumpir su asociación con otros factores de transcripción. Esto conduce a una expresión genética incorrecta en el desarrollo del corazón.
Área de la Ciencia:
- Biología cardiovascular
- Biología del desarrollo
- La genética
Sus antecedentes:
- La cardiopatía congénita (CHD, por sus siglas en inglés) es un problema de salud mundial importante.
- Los factores de transcripción juegan un papel crucial en el desarrollo del corazón.
- GATA4 es un factor de transcripción clave implicado en el desarrollo cardíaco.
Objetivo del estudio:
- Investigar las consecuencias funcionales de una mutación GATA4 en la enfermedad cardíaca congénita.
- Para aclarar los mecanismos moleculares por los cuales las mutaciones GATA4 conducen a malformaciones cardíacas.
Principales métodos:
- Se utilizaron células madre pluripotentes inducidas (iPSC) derivadas de pacientes.
- Empleó técnicas de biología genética y molecular para analizar la función GATA4.
- Se ha investigado la unión de GATA4 a los super potenciadores cardíacos y su interacción con otros factores de transcripción.
Principales resultados:
- La mutación de GATA4 no afectó su reclutamiento para superpotenciadores cardíacos.
- El GATA4 mutado no se asoció eficazmente con un factor crítico de co-transcripción.
- Esta interrupción de la asociación resultó en la expresión errónea de genes no cardiomiocíticos durante el desarrollo del corazón.
Conclusiones:
- Las mutaciones GATA4 causan enfermedades cardíacas congénitas a través de la pérdida de la asociación funcional con los cofactores.
- La interacción GATA4 interrumpida, no el deterioro de la unión al ADN, es la causa de los defectos cardíacos observados.
- La comprensión de estos mecanismos puede informar futuras estrategias terapéuticas para la enfermedad cardíaca congénita.
Más Videos Relacionados
11:00Assessment of Sarcoplasmic Reticulum Calcium Reserve and Intracellular Diastolic Calcium Removal in Isolated Ventricular Cardiomyocytes
Published on: September 18, 2017
10.7K
10:21Scanning Electron Microscopy of Macerated Tissue to Visualize the Extracellular Matrix
Published on: June 14, 2016
10.7K
Videos de Conceptos Relacionados
01:26Imbalances in Cardiac Output
3.4K
The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send...
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send...
3.4K
01:28Mechanism of Cardiac Arrhythmias
2.5K
Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
2.5K
01:17Pathophysiology of Heart Failure
4.3K
Heart failure (HF) is a progressive syndrome involving ventricles that leads to inadequate cardiac output. It can be classified based on location and output or ejection fraction. Ejection fraction (EF) is an essential measurement in the diagnosis and surveillance of HF. Reduced EF corresponds to systolic heart failure (HFrEF). However, HF with preserved ejection fraction (HFpEF) is becoming increasingly prevalent. Also known as diastolic HF, this form of HF is related to aging. The...
4.3K
01:29Pathophysiology of Cardiac Performance
1.8K
Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
1.8K
01:27Heart Failure I: Introduction
1.1K
Heart failure refers to a clinical syndrome caused by structural or functional cardiac disorders that prevent the heart from pumping an adequate amount of blood to meet the body's metabolic needs. This condition often arises from myocardial infarction or ischemia, leading to decreased cardiac output, reduced tissue perfusion, impaired gas exchange, fluid volume imbalance, and decreased functional ability.Heart failure can result from disruptions in the mechanisms that regulate cardiac output...
1.1K
01:58Cooperative Allosteric Transitions
9.2K
Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
9.2K