GNPNAT1 encodes glucosamine-phosphate N-acetyltransferase 1, a crucial enzyme in the hexosamine biosynthesis pathway that catalyzes the conversion of glucosamine-6-phosphate to N-acetylglucosamine-6-phosphate 1. This enzyme is essential for the synthesis of uridine diphosphate-N-acetylglucosamine (UDP-GlcNAc), which participates in protein glycosylation processes 2. GNPNAT1 operates through its acetyltransferase activity and is involved in multiple cellular processes including cell cycle regulation, ribosome function, and RNA transport 3. The protein localizes to the cytosol and exhibits protein binding capabilities 2. Disease relevance includes a novel autosomal recessive skeletal dysplasia termed rhizomelic dysplasia, Ain-Naz type, caused by biallelic GNPNAT1 variants 24. Affected individuals present with severe short stature, rhizomelic limb shortening, hip dysplasia, and platyspondyly 24. Functional studies demonstrate that GNPNAT1 is critical for growth plate chondrocyte proliferation and differentiation 2. Additionally, GNPNAT1 overexpression is associated with poor prognosis in multiple cancers, including breast cancer and lung adenocarcinoma, where it promotes cancer cell stemness and correlates with immune infiltration patterns 563. Clinically, GNPNAT1 serves as a potential biomarker for cancer prognosis and may represent a therapeutic target 53.