New Study Links hCG in IVF to Epigenetic Shifts in Children's Brains

A new study has uncovered a connection between hCG exposure during assisted reproductive technology (ART) and epigenetic changes in children. The research, led by Jiang, Wei, Liu, and colleagues, suggests these changes may influence neurodevelopment. The findings highlight the importance of timing and dosage in hCG administration during ART protocols. The team used whole-genome bisulfite sequencing and single-cell methylation analysis to examine DNA methylation patterns. They found that hCG exposure on the trigger day of ART can alter methylation at genes tied to neurodevelopment and synaptic function. These epigenetic shifts were linked to cognitive function, executive processing, and social behaviour in ART-conceived children.

hCG is known to trigger intracellular signals that may disrupt the establishment or maintenance of methylation marks. This occurs during oocyte maturation and early embryo development, potentially shaping long-term gene regulation. The study also observed that these transient hormonal changes could leave lasting imprints on phenotype and neurodevelopmental trajectories.

The researchers emphasise the need to refine ART approaches by exploring paternal contributions and environmental interactions. They suggest that optimising hCG parameters could reduce adverse epigenetic and developmental effects, improving safety for future generations. The study underscores the broader impact of ART endocrinology on offspring. By controlling molecular effects of interventions like hCG, clinicians may better safeguard neurological health. Further research is needed to tailor personalised and safer ART protocols.