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<p>Fanconi anemia (FA) is a genetic disorder characterized by bone marrow failure and cancer predisposition. The FA cellular phenotype is marked by a defective DNA double-strand break repair. Alongside this defect, FA cells exhibit mitochondrial dysfunction and redox unbalance. In addition, FA cells display an altered microRNA profile, including miR-29a-3p, which plays a crucial role in hematopoiesis by supporting the self-renewal, lineage commitment, and differentiation of hematopoietic stem cells (HSCs). In this study, we demonstrate that miR-29a-3p is downregulated in lymphoblasts and fibroblasts mutated for the FANC-A gene, leading to hyperactivation of PI3K/AKT pathway due to the overexpression of its target genes, FOXO3, SGK1, and IGF1, and resulting in altered mitochondrial metabolism and insufficient antioxidant response. In addition, miR-29a-3p downregulation appears associated with hyperactivation of the TGF-β signal. By contrast, FA cells transfected with miR-29a-3p show an improvement in mitochondrial metabolism, oxidative stress response, and DNA damage accumulation, by inhibiting the PI3K/AKT pathway and modulating the TGF-β pathway through a feedback mechanism. In conclusion, our results highlight the central role of miR-29a-3p in FA cells, suggesting that it is a promising molecular target to address several mechanisms based on FA pathogenesis.</p> Graphical abstract <p></p>

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miR-29a-3p and TGF-β Axis in Fanconi anemia: mechanisms driving metabolic dysfunction and genome stability

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年6月25日

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  • Nadia Bertola,
  • Stefano Regis,
  • Vanessa Cossu,
  • Matilde Balbi,
  • Martina Serra,
  • Fabio Corsolini,
  • Cristina Bottino,
  • Paolo Degan,
  • Carlo Dufour,
  • Filomena Pierri,
  • Enrico Cappelli,
  • Silvia Ravera

摘要

Fanconi anemia (FA) is a genetic disorder characterized by bone marrow failure and cancer predisposition. The FA cellular phenotype is marked by a defective DNA double-strand break repair. Alongside this defect, FA cells exhibit mitochondrial dysfunction and redox unbalance. In addition, FA cells display an altered microRNA profile, including miR-29a-3p, which plays a crucial role in hematopoiesis by supporting the self-renewal, lineage commitment, and differentiation of hematopoietic stem cells (HSCs). In this study, we demonstrate that miR-29a-3p is downregulated in lymphoblasts and fibroblasts mutated for the FANC-A gene, leading to hyperactivation of PI3K/AKT pathway due to the overexpression of its target genes, FOXO3, SGK1, and IGF1, and resulting in altered mitochondrial metabolism and insufficient antioxidant response. In addition, miR-29a-3p downregulation appears associated with hyperactivation of the TGF-β signal. By contrast, FA cells transfected with miR-29a-3p show an improvement in mitochondrial metabolism, oxidative stress response, and DNA damage accumulation, by inhibiting the PI3K/AKT pathway and modulating the TGF-β pathway through a feedback mechanism. In conclusion, our results highlight the central role of miR-29a-3p in FA cells, suggesting that it is a promising molecular target to address several mechanisms based on FA pathogenesis.

Graphical abstract