MRPL48 (mitochondrial ribosomal protein L48) is a structural component of the mitochondrial large ribosomal subunit required for mitochondrial translation and oxidative phosphorylation. The protein localizes to the mitochondrial inner membrane and interacts with the Oxa1L insertion machinery, facilitating co-translational insertion of mitochondria-synthesized proteins 1. MRPL48 cross-links to multiple mitochondrial ribosomal proteins including MRPL49 and MRPL51, supporting its role in ribosome assembly and function 1. Pathologically, MRPL48 expression is dysregulated across multiple malignancies. In adrenocortical carcinoma, MRPL48 is significantly downregulated on chromosome 11 with 91% diagnostic accuracy for distinguishing carcinoma from adenoma 2. Conversely, MRPL48 is overexpressed in hepatocellular carcinoma, correlating with poor prognosis and reduced overall survival, particularly in methylation-deficient tumors 3. MRPL48 knockout enhances cetuximab sensitivity in colorectal cancer cells 4. In emphysema, decreased MRPL48 levels in alveolar type II cells associate with mitoribosome dysfunction and impaired mitochondrial translation 5. Additionally, MRPL48 expression variation correlates with sex-related differences in neonatal cerebrospinal fluid system development 6. These findings suggest MRPL48 functions as both a tumor suppressor in some contexts and an oncogenic driver in others, with potential clinical significance as a biomarker.