Cord Blood Metabolic Signatures of Birth Weight: A Population-Based Study

Area of Science:

• Environmental Health
• Metabolomics
• Perinatal Medicine

Background:

• Birth weight is a critical indicator of neonatal health and a predictor of long-term well-being.
• The specific biological pathways and environmental influences determining birth weight variability remain incompletely understood.

Purpose of the Study:

• To identify biological pathways affected by environmental exposures that are crucial for determining birth weight.
• To investigate the relationship between cord blood metabolites and birth weight across European birth cohorts.

Main Methods:

• Untargeted mass-spectrometry-based metabolomics was applied to 481 cord blood samples from four European cohorts.
• A metabolome-wide association scan was conducted on over 4000 metabolic features, with a false discovery rate control at 5%.

Main Results:

• Sixty-eight metabolites were significantly associated with birth weight, including vitamin A, progesterone, docosahexaenoic acid, indolelactic acid, acylcarnitines, and phosphatidylcholines.
• Pathway analysis revealed enrichment in tryptophan metabolism, prostaglandin formation, C21-steroid hormone signaling, carnitine shuttle, and glycerophospholipid metabolism.
• Vitamin A showed a potential mediating role, associated with both maternal smoking and birth weight.

Conclusions:

• The study elucidates key metabolic pathways integral to fetal growth, expanding our understanding of birth weight determinants.
• These findings have significant implications for improving antenatal and perinatal care and potentially for long-term health outcomes.