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The developmental changes in mitochondrial DNA content per cell in human cord blood leukocytes during gestation

M Pejznochová1, M Tesařová, T Honzík

  • 1Department of Pediatrics, Faculty of Medicine, Charles University, Prague, Czech Republic.

Physiological Research
|December 7, 2007
PubMed

Insights

Mitochondrial DNA (mtDNA) content per cell decreases in human cord blood leukocytes as fetal development progresses. This finding suggests a shift in hematopoiesis during gestation.

Area of Science:

  • Biochemistry
  • Genetics
  • Developmental Biology

Background:

  • Mitochondrial DNA (mtDNA) is crucial for cellular energy production (ATP) and plays a vital role in fetal development and postnatal health.
  • Human cord blood leukocytes (HCBL) are easily accessible and can serve as marker cells for studying changes in mtDNA during fetal development, despite their low metabolic contribution.

Purpose of the Study:

  • To investigate the changes in mitochondrial DNA (mtDNA) amount within human cord blood leukocytes (HCBL) during fetal development.

Main Methods:

  • Isolation of HCBL from 107 neonates across a gestational range of 25–41 weeks.
  • Quantitative analysis of mtDNA amount using real-time PCR.

Main Results:

  • A significant negative correlation was observed between relative mtDNA amount in HCBL and gestational age (r = -0.54, p<0.01).
  • A significant negative correlation was also found between relative mtDNA amount in HCBL and birth weight (r = -0.43, p<0.01).
  • The study demonstrated a decrease in mtDNA content per HCBL cell with advancing fetal development.

Conclusions:

  • Mitochondrial DNA content per cell decreases in HCBL as fetal development progresses.
  • This decrease may be attributed to the shift in hematopoiesis from the fetal liver to the bone marrow during the latter half of pregnancy.
  • A concurrent reduction in HCBL cell volume, similar to red blood cells, might also contribute to the observed decrease in mtDNA content.

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