tRNA-m1A modification safeguards fetal liver HSPCs from DNA damage by maintaining iron homeostasis.

Loss of tRNA methyltransferase Trmt61a reduces m1A modification, impairing Tfrc translation and causing iron deficiency that damages fetal liver HSPCs.

• Why it matters: Understanding how tRNA modifications influence HSPC development is crucial, as disruptions can lead to hematopoietic disorders and compromised blood cell formation.
• What they did: Researchers used ribosome profiling and molecular analyses to show that Trmt61a deficiency causes ribosomal stalling at arginine-CGG codons in Tfrc mRNA, decreasing its synthesis in fetal liver HSPCs.
• The result: This reduction in Tfrc leads to iron depletion, DNA damage, and HSPC loss, revealing a pathway that links tRNA modification to iron homeostasis and cell survival, with potential therapeutic implications.