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Variable Methylation Potential in Preterm Placenta: Implication for Epigenetic Programming of the Offspring.

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Preterm birth is linked to later noncommunicable diseases. This study found lower methylation potential in preterm placentas, potentially impacting fetal epigenetic programming and future health.

Keywords:
HPLCepigenetic programmingmethylation potentialone carbon cycleplacenta

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Area of Science:

  • Epigenetics
  • Developmental Biology
  • Nutritional Science

Background:

  • Children born preterm face higher risks for adult noncommunicable diseases.
  • Placental DNA methylation patterns are crucial for fetal programming of adult diseases.
  • Micronutrients and long-chain polyunsaturated fatty acids (LCPUFAs) influence methylation via the 1-carbon cycle.

Purpose of the Study:

  • To investigate the impact of preterm birth on placental methylation potential.
  • To examine mRNA and protein levels of key enzymes (MAT2A, AHCY) in the S-adenosylmethionine pathway.
  • To assess S-adenosylmethionine (SAM), S-adenosylhomocysteine (SAH) levels, and global DNA methylation in preterm and term placentae.

Main Methods:

  • Real-time quantitative polymerase chain reaction (qPCR) for mRNA analysis.
  • Enzyme-linked immunosorbent assay (ELISA) for protein quantification.
  • High-performance liquid chromatography (HPLC) for SAM and SAH level determination.

Main Results:

  • Higher mRNA levels of MAT2A and AHCY were observed in preterm placentae.
  • The SAM:SAH ratio was lower in the preterm group.
  • Increased global DNA methylation was found in placentae of small for gestational age infants.

Conclusions:

  • Preterm placentae exhibit altered enzyme expression and a reduced methylation potential.
  • These epigenetic changes may contribute to the increased risk of noncommunicable diseases in individuals born preterm.
  • Findings highlight the role of placental epigenetics in fetal programming and long-term health outcomes.