Based on limited published evidence, RIMBP3C is a probable component of the manchette, a microtubule-based structure essential for sperm head morphogenesis during late spermatid development. GO annotations indicate roles in spermatid development, fertilization, and benzodiazepine receptor binding. A single study identified RIMBP3C as a hub gene associated with sunitinib response and immune infiltration in clear cell renal cell carcinoma 1, though this appears to be a bioinformatic finding rather than direct functional characterization.