Based on limited published evidence, C20orf173 is an uncharacterized protein with predicted roles in glycoprotein biosynthesis and sialylation. GO annotations indicate protein binding capacity and beta-galactoside alpha-2,3-sialyltransferase activity, suggesting involvement in cell surface glycan modification and membrane-associated processes. A recent proteomic discovery study identified C20orf173 as a novel protein associated with pulmonary emphysema in a population-based cohort, with associations replicated in COPD studies 1. The protein was retained in predictive models and contributed to explaining emphysema variance, though its specific mechanistic role remains undefined.