Genetic Variants and the Cortisol Response in Children: An Exploratory Study

Area of Science:

• Genetics and Molecular Biology
• Pediatric Psychology
• Stress Physiology

Background:

• The cortisol stress response is a key indicator of distress in children undergoing medical procedures.
• Understanding the genetic underpinnings of this response can help identify vulnerable individuals.

Purpose of the Study:

• To investigate genomic variations associated with the cortisol stress response in children experiencing painful medical procedures.
• To identify specific genes and genetic markers related to acute stress reactivity in pediatric populations.

Main Methods:

• Saliva samples were collected from children (4-10 years) and their parents to measure cortisol levels and perform genotyping.
• Association analyses and family-based transmission disequilibrium tests (TDTs) were employed to analyze genotype-phenotype relationships.
• Genomic data from 326 children and 376 family trios were analyzed.

Main Results:

• Four single-nucleotide polymorphisms (SNPs) were found to be potentially associated with the cortisol stress response: rs1176744 (HTR3B), rs10062367 (CRHBP), rs634479 (OPRM1), and rs8030107 (NTRK3).
• A two-SNP haplotype in HTR1B (rs6296, rs11568817) showed suggestive association with cortisol response in family-based analyses.
• Allelic TDTs indicated a potential relationship between rs7897947 (NFKB2) and cortisol response.

Conclusions:

• Preliminary evidence suggests that genes in serotonin, dopamine, BDNF, HPA axis, and inflammatory pathways may influence children's cortisol response to acute stressors.
• Identifying genetic predispositions can help pinpoint children at higher risk for adverse reactions to painful medical events.
• These findings may inform the development of tailored interventions for children experiencing significant distress during medical procedures.