A transcription factor regulates development of a bacteria-housing eukaryotic cell through DNA damage mitigation.

Adf-1 transcription factor promotes bacteriocyte maintenance by activating ATR-mediated DNA repair, preventing cell death in whitefly symbiotic cells.

• Why it matters: Understanding how bacteriocytes are preserved is crucial because these cells host intracellular microbes vital for invertebrate health, yet their molecular regulation remains unclear.
• What they did: Researchers used DNA affinity purification sequencing, reporter assays, and RNA interference to identify Adf-1’s regulation of ATR and its role in DNA damage response in whitefly bacteriocytes, focusing on 1,000 target genes.
• The result: Findings show that Adf-1 enhances ATR expression, reducing DNA damage and cell death, which sustains bacteriocyte populations and symbiont levels, revealing a conserved DNA repair pathway essential for symbiosis stability.