The association between early-life relative telomere length and childhood neurodevelopment

Area of Science:

• Pediatric Neurodevelopment
• Genetics and Epigenetics
• Developmental Toxicology

Background:

• Telomeres, protective caps on chromosomes, shorten with age and are influenced by environmental factors.
• Telomere length (TL) is a potential biomarker for cellular aging and oxidative stress.
• Understanding TL's role in early development is crucial for identifying potential risks and interventions.

Purpose of the Study:

• To investigate the association between relative telomere length (rTL) and neurodevelopmental outcomes in children.
• To determine if rTL measured at birth and in early childhood predicts cognitive and developmental trajectories.

Main Methods:

• Longitudinal study of children in the Seychelles Child Development Study Nutrition Cohort 1 (NC1).
• Relative telomere length (rTL) measured in cord blood and blood at age five.
• Neurodevelopmental assessments conducted at 9, 30 months, and 5 years of age.
• Multivariable linear regression used to analyze associations between rTL and neurodevelopmental outcomes, adjusting for covariates.

Main Results:

• Mean rTL was 1.18 at birth and decreased to 0.71 by age five.
• Increased cord blood rTL was associated with higher scores on the psychomotor developmental index at 30 months and the Woodcock Johnson test of achievement letter-word score at age five.
• These associations were not consistently significant after outlier exclusion or for rTL measured at age five.

Conclusions:

• The study found limited consistent evidence for an association between telomere length and neurodevelopment in children.
• While some associations were observed, particularly with cord blood rTL, they were not robust across all measures or time points.
• Further research with larger sample sizes and longer follow-up is needed to clarify the role of telomere length in neurodevelopment and its potential as a biomarker for oxidative stress.