What it is
Many invertebrates house symbiotic bacteria inside specialized host cells called bacteriocytes. Building on their earlier finding that the transcription factor Adf-1 suppresses bacteriocyte death in whiteflies, the authors show that Adf-1 binds the promoter of ATR, a DNA damage response kinase, and positively regulates its expression in bacteriocytes. Silencing either Adf-1 or ATR increased DNA damage in these cells, and knocking down ATR promoted apoptosis and autophagy, reduced bacteriocyte division and numbers, and lowered symbiont levels.
Why it matters
How bacteriocytes are maintained has been poorly understood, even as their development, differentiation and proliferation have drawn growing attention. These cells live under persistent genotoxic stress associated with polyploidy and high metabolic activity, and the study identifies DNA damage repair, driven by Adf-1's activation of ATR, as a mechanism that keeps them alive and keeps the symbiosis stable.
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Filed underBacterial Genetics and Biotechnology, Invertebrate Immune Response Mechanisms, Insect symbiosis and bacterial influences