What marks definitive endoderm progenitors in hESCs?

Single-cell RNA-seq separates definitive endoderm progenitors and links metabolism/hypoxia to DE differentiation.

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What is definitive endoderm?

Internal embryonic gut layer formed via the primitive streak.

What did scRNA-seq reveal about endoderm progenitors?

A unique endoderm progenitor signature at single-cell resolution.

Which PC separates DE cells?

PC5 discriminates DE from other progenitors.

What process is enriched on DE-separating loadings?

Metabolism in DE genesis.

How does severe hypoxia affect DE markers?

1.5% O2 increases CXCR4+ cell percentage vs 5% or normoxia.

Do mouse studies agree on hypoxia and DE?

Authors say results corroborate mouse ES work where hypoxia facilitated DE differentiation.

What does timing of DE birth suggest?

Nascent DE specification is a well-timed event sensitive to enhancing factors like hypoxia.

Starting stem cells?

H1 human embryonic stem cells.

Why single-cell resolution?

To capture lineage-specific transcriptomic features among progenitors.

Teaching point?

Lineage emergence can be resolved transcriptionally and modulated by metabolic/oxygen context.

What organs derive from DE?

Specialized epithelial tissues of gut-derived organs (e.g., lungs, esophagus, etc.).