GTPBP6 is a GTP-binding protein localized to mitochondria with dual functions in ribosomal biogenesis and recycling. Structurally, GTPBP6 is a homolog of the bacterial ribosome-recycling factor HflX 1. In mitochondrial translation, GTPBP6 facilitates dissociation of ribosomes and is required for assembly of the large ribosomal subunit (mtLSU) 1. During biogenesis, GTPBP6 works with assembly factors MTERF4, NSUN4, and other GTPases to promote peptidyl transferase center (PTC) folding and maturation, acting as a molecular switch that drives progression toward mature ribosomal structure 2. Loss of GTPBP6 causes accumulation of late mtLSU assembly intermediates, demonstrating its essential role in quality control of ribosome assembly 1. This dual role in both biogenesis and recycling distinguishes GTPBP6 from its bacterial counterpart and reflects mitochondria's specialized translation requirements 3. As an X/Y pseudoautosomal gene, GTPBP6 expression is dysregulated in sex chromosome X|Y 45. In Klinefelter's syndrome, GTPBP6 overexpression correlates inversely with verbal cognition, suggesting potential neurological implications 5. GTPBP6 mutations have been identified in pancreatic cancer metastases 6. Overall, GTPBP6 represents a critical conserved factor ensuring efficient mitochondrial protein synthesis.