NKX2.2 is required for timely NEUROG3 extinction and segregation of competing lineage programs in human pancreatic endocrine progenitors

NKX2.2 loss in human pancreatic endocrine progenitors preserves NEUROG3 activity and causes persistent co-activation of ARX and PAX4 programs, yielding few insulin+ end-stage cells.

• Why it matters: NKX2.2 is known to be needed for islet formation, but its specific function during the NEUROG3+ progenitor stage and fate resolution was unclear.
• What they did: NKX2.2-null human embryonic stem cells were differentiated to endocrine lineages, followed by single-cell transcriptomics and reanalysis of published NKX2.2 ChIP-seq.
• The result: Mutant progenitors still induce NEUROG3 and commit near wild-type frequency, yet fail to extinguish NEUROG3 and terminal lineage factors, producing excess somatostatin, ghrelin, polyhormonal, and hormone-negative cells.

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