MRPS31 encodes mitochondrial ribosomal protein S31, a structural component of the mitochondrial ribosome involved in mitochondrial protein synthesis 1. The protein functions in mitochondrial translation and exhibits RNA binding capabilities, localizing to the mitochondrial inner membrane according to GO annotations 1. Mechanistically, MRPS31 participates in mitochondrial metabolism regulation and has been identified as a hub gene in mitochondrial dysfunction associated with septic cardiomyopathy 1. The gene shows disease relevance across multiple cancer types, being upregulated in epithelial ovarian cancer where it correlates with poor prognosis 2, and identified as essential for cell survival in mucinous ovarian carcinoma through CRISPR screening 3. MRPS31 expression is also dysregulated in Parkinson's disease blood samples 4 and represents a potential mitochondrial target gene in type 2 diabetes skeletal muscle tissue 5. Interestingly, evolutionary analysis suggests that a pseudogene MRPS31P5 may have evolved from a chimeric RNA precursor and functions as a regulatory transcript in colorectal cancer, demonstrating the complex evolutionary relationship between MRPS31 and related transcripts 67. Clinically, MRPS31 serves as a potential biomarker for thyroid carcinoma progression 8.