Axon Guidance Proteins in Cord Blood Mark One-Third of SGA Infants for Later Lung Impairment

University of Arizona investigators examined CADRE consortium samples collected since the 1980s from term infants followed to midlife. Proteomic profiling identified overrepresentation of axon guidance molecules in SGA cord blood; concentrations showed a graded inverse relationship with FEV1 and FVC measured at ages 35–40. Parallel GWAS signals in axon guidance loci and single-cell sheep lung data converged on disrupted branching morphogenesis as the shared pathway. The pattern was geographically consistent despite socioeconomic variation, indicating a developmental rather than purely environmental driver.

These proteins normally direct neuronal and vascular branching; their persistence in circulation after birth appears to index incomplete alveolar and airway arborization. Prior observational cohorts had linked SGA to reduced lung volumes and higher COPD incidence, yet lacked molecular intermediates. The current work supplies one candidate mechanism that may extend to cardiovascular and metabolic sequelae through analogous vascular and islet developmental defects.

Next steps require prospective birth cohorts with serial proteomics and organ imaging, plus functional studies that test whether modulating these pathways postnatally alters trajectories. Randomized trials of early interventions can then be stratified by cord-blood protein levels to assess prevention of adult chronic disease.