TBX5 gene discovery reveals role in heart DNA organization

Researchers have discovered that the TBX5 gene, which is linked to congenital heart disease, plays a critical role in organizing the three-dimensional structure of DNA within heart cells. While it was previously known that TBX5 regulates gene activity, a new study published in the journal Science reveals it also acts as an architect for the genome's physical folding.

Losing just one functional copy of the TBX5 gene—a condition known as haploinsufficiency—can cause the genome's 3D structure to unravel. This disruption prevents the proper activation of genes essential for healthy heart development. This mechanism may explain why individuals with the same mutation can develop varying degrees of heart defects.

Congenital heart disease is the most common birth defect, affecting approximately 1 in 100 infants annually. Scientists at the Gladstone Institutes utilized human stem cells transformed into cardiac muscle cells to observe these structural changes. Researchers suggest this finding could provide insights into other birth defects caused by similar genetic mechanisms.