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MCTP2 is a dosage-sensitive gene required for cardiac outflow tract development
Seema R Lalani1, Stephanie M Ware, Xueqing Wang
1Department of Molecular and Human Genetics.
Human Molecular Genetics
|June 19, 2013
Summary
Genetic variations in the MCTP2 gene are linked to serious heart defects like coarctation of the aorta (CoA) and hypoplastic left heart syndrome (HLHS). This discovery offers new insights into the genetic causes of congenital heart disease.
Area of Science:
- Genetics
- Developmental Biology
- Cardiology
Background:
- Coarctation of the aorta (CoA) and hypoplastic left heart syndrome (HLHS) are severe congenital heart defects.
- Previous studies linked large deletions on chromosome 15q26 to these conditions, but no specific gene was identified.
Purpose of the Study:
- To identify the specific gene responsible for left ventricular outflow tract (LVOT) malformations in chromosome 15q26 deletions.
- To investigate the role of the MCTP2 gene in cardiac development.
Main Methods:
- Array-comparative genomic hybridization (array-CGH) to detect deletions.
- Gene-specific array screening to identify duplications.
- Morpholino knockdown and mRNA overexpression in Xenopus laevis embryos to assess gene function.
Main Results:
- Identified a 2.2 Mb deletion in 15q26.2 in two half-siblings with CoA, inherited from a mosaic mother.
- Found a de novo intragenic duplication in MCTP2 in an individual with HLHS and CoA.
- Demonstrated that altered Mctp2 expression in Xenopus embryos disrupts outflow tract development.
Conclusions:
- MCTP2 is identified as a novel gene associated with coarctation of the aorta and related cardiac malformations.
- MCTP2 is a dosage-sensitive gene crucial for proper outflow tract development during cardiogenesis.
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