Genetic research into congenital heart disease

Researchers have identified new genetic mechanisms contributing to congenital heart disease, a condition affecting roughly 1 in 100 infants. Studies published in Science and Science China Life Sciences highlight how disruptions in DNA structure and regulatory switches impact heart development.

At the Gladstone Institutes, scientists discovered that the TBX5 gene acts as an architect for the three-dimensional structure of DNA in heart cells. Losing just one copy of TBX5 can cause the genome’s physical folding to unravel, disrupting the expression of other genes necessary for building a healthy heart. This mechanism may explain why individuals with the same mutation can experience different types or degrees of heart defects.

In a separate study, researchers from Nanjing Medical University investigated tetralogy of Fallot by sequencing the entire genomes of 428 patients. They identified functional variants in non-coding DNA that act as switches to control the regulation of genes like TBX1, which is critical for the development of the heart’s outflow tract. This suggests that defects can arise from the loss of regulatory elements that control gene activity, rather than just broken genes.