Telomere length shortening in hospitalized preterm infants: A pilot study

Area of Science:

• Biochemistry
• Pediatrics
• Genetics

Background:

• Leukocyte telomere length (LTL) is a biomarker for aging and age-related health risks.
• Preterm infants, especially those hospitalized in the neonatal intensive care unit (NICU), often face heightened oxidative stress and inflammation, factors known to accelerate telomere shortening.
• Understanding LTL dynamics in this vulnerable population is crucial for assessing potential long-term health implications.

Purpose of the Study:

• To investigate the longitudinal changes in relative leukocyte telomere length (LTL) among preterm infants (<32 weeks' gestation) during their NICU hospitalization.
• To determine if LTL exhibits a measurable decline over the course of NICU care.
• To explore the potential of LTL changes as an indicator of NICU-related exposures and associated health risks.

Main Methods:

• A longitudinal study was conducted involving 10 preterm infants with a mean gestational age of 27 weeks at birth.
• DNA was extracted from dried blood spots collected at three distinct time points during hospitalization for each infant.
• Relative leukocyte telomere length (LTL) was quantified using Real Time Quantitative PCR (RT-qPCR) in triplicate.

Main Results:

• A statistically significant average decline in relative leukocyte telomere length (LTL) of 0.021 units per week was observed from birth to discharge (p = 0.03).
• This decline remained significant after adjusting for gestational age at birth.
• The findings indicate a measurable shortening of telomeres during the NICU hospitalization period.

Conclusions:

• Telomere length shows a measurable decline in preterm infants throughout their NICU hospitalization.
• This shortening may serve as a biomarker reflecting exposures encountered during NICU care.
• Changes in telomere length could potentially provide insights into both short- and long-term health risks for these infants.