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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...
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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
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MESP1 loss‑of‑function mutation contributes to double outlet right ventricle.

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A novel MESP1 gene mutation was identified in a patient with congenital heart disease (CHD). This loss-of-function mutation provides new insights into the molecular causes of double outlet right ventricle (DORV), aiding genetic counseling for CHD patients.

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Area of Science:

  • Genetics
  • Cardiovascular Biology
  • Developmental Biology

Background:

  • Congenital heart disease (CHD) is a major cause of infant mortality globally, with genetic factors playing a significant role.
  • Over 60 genes are linked to CHD, yet the genetic basis for many patients remains unclear.
  • MESP1, a transcription factor crucial for cardiovascular development, is implicated in heart formation.

Purpose of the Study:

  • To investigate the role of MESP1 mutations in the pathogenesis of CHD.
  • To identify novel genetic variants in MESP1 associated with congenital heart defects.
  • To functionally characterize the impact of identified MESP1 mutations on protein activity.

Main Methods:

  • Sequencing of MESP1 coding exons and flanking introns in 178 unrelated CHD patients.
  • Genotyping of MESP1 in relatives of patients and 200 healthy controls.
  • Functional analysis of MESP1 mutations using a dual-luciferase reporter assay.

Main Results:

  • A novel de novo heterozygous MESP1 mutation (p.Q118X) was identified in a patient with double outlet right ventricle (DORV) and ventricular septal defect.
  • The identified nonsense mutation was absent in 400 control chromosomes and affected a conserved amino acid.
  • Functional assays revealed that the mutant MESP1 protein lacked transcriptional activity compared to the wild-type.

Conclusions:

  • This study provides the first experimental evidence that MESP1 loss-of-function mutations can contribute to DORV in humans.
  • The findings enhance our understanding of the molecular pathogenesis of CHD.
  • These results have implications for genetic counseling and personalized medicine approaches for CHD patients.