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Single-cell transcriptomics identifies divergent developmental lineage trajectories during human pituitary

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|October 20, 2020
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This study maps human fetal pituitary cell development using single-cell RNA sequencing. It reveals distinct developmental paths and intermediate states for hormone-producing cells, including a novel chorionic gonadotropin-expressing subtype.

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Area of Science:

  • Endocrinology
  • Developmental Biology
  • Genomics

Background:

  • The anterior pituitary gland is crucial for growth, reproduction, metabolism, and stress response.
  • Understanding human pituitary development is key to deciphering endocrine regulation.

Purpose of the Study:

  • To characterize the transcriptional landscape of human fetal pituitary development.
  • To identify distinct cell lineages, developmental trajectories, and intermediate states.
  • To uncover novel cell subtypes and transcription factor dynamics.

Main Methods:

  • Single-cell RNA sequencing (scRNA-seq) of 4113 individual cells from human fetal pituitaries.
  • Computational analysis to define developmental trajectories and cell states.
  • Identification of lineage-specific transcription factors and novel cell subtypes.

Main Results:

  • Detailed characterization of divergent developmental trajectories in five hormone-producing cell lineages.
  • Identification of early intermediate states for corticotropes and multistep trajectories for gonadotropes.
  • Discovery of a fetal gonadotrope subtype expressing chorionic gonadotropin and characterization of pituitary stem cell heterogeneity.

Conclusions:

  • Provides comprehensive insights into the transcriptional dynamics of human pituitary development.
  • Defines distinct cell substates and subtypes, including a primate-specific gonadotrope subtype.
  • Illustrates the complex transcription factor regulation during cell fate commitment in the pituitary.