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How Placenta Promotes the Successful Reproduction in High-Altitude Populations: A Transcriptome Comparison between

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Tibetans ensure successful high-altitude pregnancies through enhanced placental function, unlike Han immigrants who show a stress response. This study reveals key genetic and molecular adaptations for high-altitude survival.

Keywords:
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Area of Science:

  • Human adaptation
  • High-altitude physiology
  • Reproductive biology

Background:

  • Tibetans exhibit high offspring survival rates at high altitudes.
  • Genetic adaptations to high altitude are not fully understood.
  • Placental function is crucial for successful pregnancy.

Purpose of the Study:

  • To investigate placental transcriptome differences between Tibetans, sea-level Han, and Han immigrants at high altitude.
  • To uncover molecular mechanisms of high-altitude adaptation in Tibetan placentas.
  • To understand the placental response to hypoxia in different populations.

Main Methods:

  • Comparative placental transcriptome analysis.
  • Gene expression profiling.
  • Identification of population-specific genetic variants.

Main Results:

  • Han immigrants' placentas showed a hypoxic stress response.
  • Tibetan placentas displayed up-regulation of placenta-specific genes, autophagy, and TCA cycle.
  • Both groups activated hypoxia responses (antioxidant, angiogenesis) via different genes.
  • A novel Tibetan-specific EPAS1 isoform was identified.

Conclusions:

  • Tibetan placentas strengthen natural functions for successful high-altitude pregnancies.
  • Han immigrant placentas undergo acclimatization, indicating a common hypoxic stress response.
  • Placental transcriptome analysis reveals distinct adaptation strategies to high altitude.