MRPS33 (mitochondrial ribosomal protein S33) is a structural component of the mitochondrial small ribosomal subunit involved in mitochondrial protein synthesis 1. As a constituent of the mitoribosomes, MRPS33 functions in mitochondrial translation, a core metabolic process essential for cellular energy production. Beyond its canonical ribosomal role, MRPS33 has emerged as a genetic risk factor across multiple disease contexts. Rare variants in MRPS33 associate with sleep-disordered breathing traits in diverse populations 2. Additionally, MRPS33 variants show novel associations with diabetic retinopathy susceptibility 3 and demonstrate sex-specific expression patterns relevant to Alzheimer's disease prediction in males 4. MRPS33 also exhibits significant associations with lean body mass in children 5 and demonstrates paternal genetic nurture effects on type 2 diabetes risk 6. At the molecular level, MRPS33 shows age-related DNA hypermethylation in skeletal muscle tissue and differentiated muscle cells 7, suggesting epigenetic dysregulation during aging. Protein-protein interaction studies indicate MRPS33 interacts with cellular proteins implicated in tumourigenic processes 1, potentially linking mitochondrial function to cancer-related pathways. These findings collectively indicate MRPS33 functions beyond its structural ribosomal role, influencing metabolic health, aging, and disease susceptibility.