Tetrahydrobiopterin restores oligodendrocyte maturation after hypoxic white matter injury by reprogramming translational output

Daily tetrahydrobiopterin (BH4) partially reverses chronic hypoxia–induced translational disruption in oligodendrocyte lineage cells, restoring OL maturation programs and OLIG1 nuclear localization in transgenic mice.

• Why it matters: Chronic cerebral hypoxemia from complex congenital heart defects impairs white matter maturation, and the molecular mechanism by which BH4 supplementation rescues hypoxia-induced dysmaturation is not fully understood.
• What they did: TRAP-seq profiled ribosome-associated RNAs from oligodendrocyte lineage cells in transgenic ribosomal reporter mice exposed to chronic hypoxia with or without daily BH4, followed by differential translation, weighted gene co-expression network analysis, pathway enrichment, RNAscope, and immunohistochemistry.
• The result: Developmental hypoxia extensively altered the OL translatome, suppressing OL maturation transcripts and enriching translational regulation and cellular stress pathways; BH4 restored maturation-associated regulatory programs and normalized OLIG1 nuclear localization.