Mitochondrial gene mutations in pediatric septic shock
Junsung Park1, Eunju Kang2, Seoon Kang2
1Department of Pediatrics, Asan Medical Center Children's Hospital, University of Ulsan College of Medicine, Seoul, Republic of Korea.
Insights
Mitochondrial DNA (mtDNA) mutations were found in most critically ill children with septic shock. This pilot study suggests a genetic link between mitochondrial dysfunction and pediatric sepsis, warranting further research.
Area of Science:
- Genetics
- Pediatric Critical Care
- Mitochondrial Biology
Background:
- Growing interest in mitochondrial dysfunction and sepsis.
- Previous studies focused on structural, functional, or clinical aspects.
- Limited research on genetic mutations in pediatric septic shock.
Purpose of the Study:
- Evaluate mitochondrial DNA (mtDNA) gene mutations in critically ill pediatric patients with septic shock.
- Investigate the genetic basis of mitochondrial dysfunction in pediatric sepsis.
Main Methods:
- Prospective observational study of 13 pediatric patients with severe sepsis or septic shock.
- Whole-blood samples collected within 24 hours of PICU admission.
- Next-generation sequencing used for mtDNA extraction and mutation analysis.
Main Results:
- Mitochondrial DNA (mtDNA) mutations detected in 9 out of 13 patients.
- A total of 27 point mutations identified.
- Over half of mutations (55.6%) were in ATP production and superoxide metabolism-related loci.
Conclusions:
- Significant numbers of mtDNA point mutations found in pediatric septic shock patients.
- Provides evidence for mitochondrial dysfunction in sepsis on a genetic level.
- Forms a basis for future large-scale investigations into mtDNA mutations and sepsis.
Background:
There has been a growing interest in the association between mitochondrial dysfunction and sepsis. However, most studies have focused on mitochondrial structural damage, functional aspects, or the clinical phenotypes in sepsis. The purpose of this study was to evaluate mitochondrial DNA (mtDNA) gene mutations in critically ill pediatric patients with septic shock.
Method:
Thirteen patients with severe sepsis or septic shock admitted to the pediatric intensive care unit (PICU) of a tertiary children's hospital were enrolled in this prospective observational study. Clinical data from electronic medical records were obtained. Whole-blood samples were collected within 24 h of PICU admission to perform PBMC isolation, mtDNA extraction, and mtDNA sequencing using next-generation sequencing.
Results:
mtDNA sequencing revealed mutations in 9 of the 13 patients, presenting 27 point mutations overall, with 15 (55.6%) located in the locus related to adenosine triphosphate production and superoxide metabolism, including electron transport.
Conclusion:
In this pilot study, significant numbers of mtDNA point mutations were detected in critically ill pediatric patients with septic shock. These mutations could provide promising evidence for mitochondrial dysfunction in sepsis and a basis for further large-scale studies.
Impact:
This study is the first to examine mitochondrial DNA mutations in pediatric patients with septic shock using next-generation sequencing. A high frequency of mitochondrial DNA mutations was detected in these patients indicating an association with septic shock. This pilot study may provide a potential explanation for the association between mitochondrial dysfunction and septic shock on a genetic basis.
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