MTRES1 (mitochondrial transcription rescue factor 1) is a mitochondrial RNA-binding protein with dual roles in transcriptional regulation and translational quality control. Functionally, MTRES1 acts as a protective factor maintaining mitochondrial RNA levels during cellular stress by associating with mitochondrial RNA polymerase POLRMT and enhancing transcription in an RNA-binding-dependent manner 1. Beyond transcription, MTRES1 participates in a mitoribosome-associated quality control pathway that responds to elongational stalling. As a heterodimeric partner with MTRF, MTRES1 ejects peptidyl tRNA from stalled mitochondrial ribosomes, rescuing them from aberrant translation 2. MTRES1 is also required for proper mitoribosome maturation and functioning, as its depletion causes global disruption of mt-mRNA association with mitoribosomes and reduces mitochondrial translation, leading to OXPHOS deficiency 3. These functions are particularly critical given that MTRES1 is upregulated under stress conditions, suggesting it serves as an adaptive response to maintain synthesis of the 13 essential mitochondrial-encoded oxidative phosphorylation subunits. The protein's multifaceted roles in both transcriptional rescue and translational quality control position it as a key regulator of mitochondrial bioenergetics and cellular stress resilience.