Key result
GATA6 haploinsufficiency in mice leads to hypoplastic sinus nodes, prolonged PR and QT intervals, and increased susceptibility to premature atrial contractions (33% vs 0%, p=0.0323).
Why the study?
Sinus node abnormalities cause sick sinus syndrome, and mutations in transcription factor GATA6 are linked to human arrhythmia, but its role in pacemaker development and rhythm regulation required elucidation.
Does GATA6 haploinsufficiency cause sinus node hypoplasia and rhythm abnormalities in mice?
Does GATA6 haploinsufficiency cause sinus node hypoplasia and rhythm abnormalities in mice?
Absolute Event Rate: 33.3% vs 0%
p-value: p=0.0323
GATA6 is a critical regulator of sinus node development, and its haploinsufficiency causes conduction abnormalities, providing a molecular basis for GATA6 mutation-associated arrhythmias in humans.
Findings in mice suggest GATA6's developmental role; leaves open human arrhythmia translation and requires clinical validation.
The sinus node (SAN) is the primary pacemaker of the human heart, and abnormalities in its structure or function cause sick sinus syndrome, the most common reason for electronic pacemaker implantation. Here we report that transcription factor GATA6, whose mutations in humans are linked to arrhythmia, is highly expressed in the SAN and its haploinsufficiency in mice results in hypoplastic SANs and rhythm abnormalities. Cell-specific deletion reveals a requirement for GATA6 in various SAN lineages. Mechanistically, GATA6 directly activates key regulators of the SAN genetic program in conduction and nonconduction cells, such as TBX3 and EDN1, respectively. The data identify GATA6 as an important regulator of the SAN and provide a molecular basis for understanding the conduction abnormalities associated with GATA6 mutations in humans. They also suggest that GATA6 may be a potential modifier of the cardiac pacemaker.
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Gharibeh et al. (2020) studied Sinus node development and arrhythmias (n=26). Gata6 haploinsufficiency vs. Wild-type littermates was evaluated on Premature atrial contractions (PACs) on telemetry (p=0.0323). GATA6 haploinsufficiency in mice leads to hypoplastic sinus nodes, prolonged PR and QT intervals, and increased susceptibility to premature atrial contractions (33% vs 0%, p=0.0323).
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