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Related Concept Videos

Notch Signaling Pathway03:14

Notch Signaling Pathway

The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
Notch Signaling Pathway03:14

Notch Signaling Pathway

The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
Role Of Notch Signalling In Intestinal Stem Cell Renewal01:12

Role Of Notch Signalling In Intestinal Stem Cell Renewal

Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
Mitral Valve Prolapse I: Introduction01:27

Mitral Valve Prolapse I: Introduction

IntroductionThe mitral valve, one of the heart's four valves, regulates blood flow. These valves have flaps that open and close to direct blood properly through the heart and body. During each heartbeat, the flaps open for blood to pass through and seal shut to prevent backflow. Specifically, the mitral valve opens to allow blood flow from the heart's upper left chamber to the lower left chamber. It then closes securely as the lower left chamber contracts to pump blood to the body, preventing...
Mitral Stenosis I: Introduction01:22

Mitral Stenosis I: Introduction

Mitral Valve Stenosis (MVS) is a heart condition where the mitral valve narrows, impeding blood circulation from the left atrium to the left ventricle. The etiology and pathophysiology of this condition are multifaceted, leading to a cascade of cardiovascular complications.Causes of Mitral Valve StenosisRheumatic Heart Disease: It is the main cause of mitral valve stenosis, particularly in developing nations. This condition arises from rheumatic fever, an inflammatory illness resulting from...
Aortic Regurgitation I: Introduction01:15

Aortic Regurgitation I: Introduction

IntroductionAortic regurgitation is characterized by the backward flow of blood from the aorta into the left ventricle during diastole and arises from the improper closure of the aortic valve. This condition results in left ventricular volume overload and can stem from both acute and chronic etiologies, each contributing uniquely to the disease's progression and symptomatology.Acute and Chronic CausesAcute aortic regurgitation often results from events that suddenly impair the integrity of the...

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Related Experiment Video

Updated: Jul 21, 2026

Protein Isolation from the Developing Embryonic Mouse Heart Valve Region
06:55

Protein Isolation from the Developing Embryonic Mouse Heart Valve Region

Published on: September 23, 2014

Mutations in NOTCH1 cause aortic valve disease.

Vidu Garg1, Alecia N Muth, Joshua F Ransom

  • 1Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9148, USA. vidu.garg@utsouthwestern.edu

Nature
|July 19, 2005
PubMed
Summary

Mutations in NOTCH1 cause aortic valve disease by disrupting development and leading to calcification. This research uncovers a key genetic link to heart disease, offering new insights into aortic valve anomalies.

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Area of Science:

  • Cardiovascular Biology
  • Developmental Biology
  • Genetics

Background:

  • Aortic valve calcification is a major cause of heart disease, increasing with age.
  • Bicuspid aortic valves are common, but their developmental origin and link to calcification are unknown.
  • The mechanisms underlying aortic valve calcification and bicuspid valve formation remain unclear.

Purpose of the Study:

  • To investigate the role of NOTCH1 mutations in aortic valve anomalies and calcification.
  • To elucidate the developmental origin of bicuspid aortic valves and their association with valve disease.
  • To identify the molecular pathways involved in aortic valve calcification.

Main Methods:

  • Genetic analysis of human pedigrees with non-syndromic autosomal-dominant aortic valve disease.
  • Expression analysis of Notch1 in developing mouse aortic valves.
  • Investigating the interaction between Notch1, Hairy-related transcription factors (Hrt), and Runx2.

Main Results:

  • NOTCH1 mutations were identified in human pedigrees, causing aortic valve anomalies and severe calcification.
  • Notch1 expression is high in developing mouse aortic valves and represses Runx2 activity.
  • Hrt proteins, activated by Notch1, physically interact with and repress Runx2 independently of histone deacetylase activity.

Conclusions:

  • NOTCH1 mutations lead to early developmental defects in the aortic valve.
  • These defects result in later de-repression of calcium deposition, causing progressive aortic valve disease.
  • The NOTCH1-Hrt-Runx2 pathway is crucial for normal aortic valve development and preventing calcification.