Cord blood telomere length in Latino infants: relation with maternal education and infant sex.
Level 4 - case-series / case-control
Cross-sectional observational study evaluating associations in a single birth cohort (by design analogy).
PubMed 26633142 · doi:10.1038/jp.2015.178
What was done
The authors examined associations between cord blood telomere length (TL) and parental and birth factors in 54 Latino infants. Factors with significant bivariate associations were analyzed in a multivariate linear regression model. An additional analysis was performed after excluding 7 infants exposed to conditions associated with high oxidative stress (hypertension, preeclampsia, gestational diabetes, low birth weight, or preterm birth).
What was found
In multivariate analysis (n = 54), female sex was associated with longer cord blood TL (adjusted beta for male sex = -369.57 base pairs, 95% CI -718.21 to -20.92, P = 0.02). Maternal education of a high-school diploma or higher was associated with longer TL (adjusted beta = 505.68 base pairs, 95% CI 151.69 to 859.68, P < 0.01). Increasing head circumference trended toward longer TL (adjusted beta = 7.33, 95% CI -0.52 to 15.18, P = 0.07). After excluding 7 infants with oxidative stress exposures, higher birth weight percentile was significantly associated with longer TL (adjusted beta = 8.04, 95% CI 0.07 to 16.00, P = 0.048).
Why it matters
The study suggests that biological sex and maternal socioeconomic factors like educational attainment are already associated with telomere length at birth, potentially influencing early biological aging.
Limits
The study is limited by a small sample size (n = 54) resulting in wide confidence intervals. The sample was restricted to Latino infants, limiting generalizability to other populations. The cross-sectional observational design cannot demonstrate causality, and residual confounding from unmeasured socioeconomic or environmental factors cannot be excluded.
Cited by
- supports Among low-income Hispanic pregnant women, having graduated high school was associated with longer cord blood telomeres in their newborns compared to not graduating.