RNASE13 (ribonuclease A family member 13) is an inactive member of the ribonuclease A family located on chromosome 14 1. Despite GO annotations suggesting RNA nuclease activity and defense response functions, RNASE13 does not exhibit ribonuclease catalytic activity. The gene is region-specifically expressed in the male reproductive tract, particularly in the epididymis, with expression patterns changing during reproductive aging 2. Functionally, RNASE13 is dispensable for male fertility and sperm function, as CRISPR/Cas9-mediated knockout mice showed normal sperm morphology, epididymal histology, and reproductive capacity 3. Genetically, RNASE13 variants have been associated with aortic aneurysm susceptibility in Japanese populations, with the rs143881017 [C/T (R140H)] variant significantly linked to dissecting aortic aneurysm (odds ratio 5.77) 1. Additionally, RNASE13 genetic variation on chromosome 14 (rs3748348) shows significant association with executive functioning resilience in cognitive aging, though the mechanistic relationship remains unclear 4, 5. These findings suggest RNASE13 may have non-enzymatic structural or regulatory roles in vascular and neurological contexts despite its inactive ribonuclease status.