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TIM29 is a mitochondrial inner membrane protein that interacts with the protein import complex TIM22. TIM29 was shown to stabilize the TIM22 complex but its biological function remains largely unknown. Until recently, it was classified as one of the Domain of Unknown Function (DUF) genes, with a conserved protein domain DUF2366 of unclear function. Since characterizing DUF genes can provide novel biological insight, we used previously established transcriptional profiles of the germline and stem cells of the flatworm  Macrostomum lignano  to probe conserved DUFs for their potential role in germline biology, stem cell function, regeneration, and development. Here, we demonstrate that DUF2366/TIM29 knockdown in  M. lignano  has very limited effect during the normal homeostatic condition but prevents worms from adapting to a highly proliferative state required for regeneration.

TIM29 is required for enhanced stem cell activity during regeneration in the flatworm Macrostomum lignano