Mutually Repressive Transcription Factors Drive Intestinal Maturation for Weaning

BLIMP1 and CASZ1 form a mutually repressive transcriptional switch that times intestinal enterocyte maturation at weaning, coordinating neonatal versus adult identity.

• Why it matters: Neonatal enterocytes must rapidly adapt from milk absorption to adult functions, but the transcriptional logic that sets and switches their maturation timing is unclear.
• What they did: The study used genetic analysis to test roles of BLIMP1 and CASZ1 in neonatal and adult enterocytes, and assessed how glucocorticoids trigger maturation in the intestinal epithelium.
• The result: CASZ1 is required for proper maturation timing and for corticosteroids to induce maturation directly in the intestinal epithelium, linking the weaning switch to hormone-driven epithelial development.

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