Related Experiment Video
Updated: Nov 13, 2025
Author Spotlight: Optimization of Performance Parameters of the TAGGG Telomere Length Assay
Published on: April 21, 2023
Continuous reference intervals for leukocyte telomere length in children: the method matters
Analia Lesmana1, Pei Tian1, Vasiliki Karlaftis1,2
1Murdoch Children's Research Institute, Parkville, Australia.
Insights
Establishing age-matched reference intervals for telomere length (TL) in children is crucial for diagnosing conditions like bone marrow failure. This study provides method-specific continuous RIs for TL in children, aiding in accurate diagnosis and treatment.
Area of Science:
- Pediatric Hematology
- Molecular Biology
- Genetics
Background:
- Very short telomeres in children are linked to severe conditions like bone marrow failure.
- Accurate diagnosis of short telomeres requires age-matched reference intervals (RIs).
- Identifying children with short telomeres can improve bone marrow transplantation outcomes.
Purpose of the Study:
- To establish age-matched reference intervals (RIs) for telomere length (TL) in children.
- To compare three common methods for measuring leukocyte telomere length in pediatric populations.
- To provide method-specific continuous RIs for pediatric telomere length assessment.
Main Methods:
- Recruited 212 healthy children aged 30 days to 18 years.
- Measured leukocyte telomere length (TL) using terminal restriction fragment (TRF) analysis, quantitative PCR (QPCR), and Flow-FISH.
- Utilized fractional polynomial models and quantile regression to generate continuous RIs, examining factors like age and gender.
Main Results:
- Continuous RIs for TL were established as functions of age for each method.
- TRF analysis and QPCR showed a significant negative correlation between TL and age (p<0.001).
- Flow-FISH indicated no significant change in TL with age (p=0.23); gender did not influence TL.
Conclusions:
- The study offers three distinct, method-specific continuous RIs for assessing pediatric telomere length.
- The choice of method depends on sample availability, type, and desired sensitivity to age-related changes.
- These RIs facilitate accurate diagnosis and monitoring of pediatric conditions associated with telomere length.
Objectives:
Children with very short telomeres commonly develop bone marrow failure and other severe diseases. Identifying the individuals with short telomeres can improve outcome of bone marrow transplantation, with accurate diagnosis requiring the use of age-matched reference intervals (RIs). This study aimed to establish RIs for telomere length (TL) in children using three commonly used methods for TL measurement.
Methods:
Healthy children aged 30 days to 18 years were recruited for assessment using age as a continuous variable. Venous blood samples were collected and leukocyte TL was measured using terminal restriction fragment (TRF) analysis, quantitative PCR (QPCR) and flow cytometry with fluorescence in situ hybridization (Flow-FISH). Fractional polynomial model and quantile regression were performed to generate continuous RIs. Factors that might contribute to variation in TL, such as gender, were also examined.
Results:
A total of 212 samples were analyzed. Continuous RIs are presented as functions of age. TRF analysis and QPCR showed significant negative correlation between TL and age (r=-0.28 and r=-0.38, p<0.001). In contrast, Flow-FISH showed no change in TL with age (r=-0.08, p=0.23). Gender did not have significant influence on TL in children.
Conclusions:
This study provides three options to assess TL in children by establishing method-specific continuous RIs. Choosing which method to use will depend on several factors such as amount and type of sample available and required sensitivity to age-related change.
Related Concept Videos
02:41Telomeres and Telomerase
02:31Replication in Eukaryotes
01:29Replication in Eukaryotes
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
02:15Replicative Cell Senescence