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Area of Science:

  • Reproductive biology and aging research.
  • Genomics and transcriptomics.
  • Cellular and molecular mechanisms of aging.

Background:

  • Ovarian aging is a complex biological process impacting female fertility and increasing risks for reproductive health issues.
  • Understanding the spatiotemporal dynamics of ovarian aging is crucial for addressing age-related fertility decline and disorders.
  • Existing research lacks a comprehensive atlas detailing cellular and molecular changes throughout human ovarian aging.

Purpose of the Study:

  • To construct a comprehensive aging atlas of human ovarian tissues across a wide age range.
  • To elucidate the spatiotemporal dynamics and molecular mechanisms underlying human ovarian aging.
  • To identify novel cell types and molecular pathways involved in ovarian aging and associated disorders.

Main Methods:

  • Integrated single-nucleus RNA sequencing and spatial transcriptomics.
  • Analyzed 12 human ovarian tissues from individuals aged 12 to 54 years.
  • Utilized transcriptomic and spatial mapping to identify cellular and molecular changes.

Main Results:

  • Identified aging-related transcriptomic shifts, including impaired mitochondrial function and reproductive structure development.
  • Discovered a novel endothelial cell (EDC) subtype, CLDN5+ blood EDCs, with enhanced antigen-presenting and inflammatory functions in aged ovaries.
  • Revealed disrupted cellular connectivity and amplified DLK1:NOTCH3 axis, with DLK1 upregulation in granulosa cells of patients with primary ovarian insufficiency.

Conclusions:

  • Human ovarian aging involves significant transcriptomic alterations and disrupted cellular interactions.
  • CLDN5+ blood EDCs exhibit age-sensitive inflammatory and antigen-presenting roles, suggesting their involvement in ovarian aging.
  • The study provides insights into ovarian aging mechanisms and identifies potential therapeutic targets for reproductive disorders.