ALG13 is a gene that encodes a key subunit of the UDP-N-acetylglucosaminyltransferase complex, which is involved in the early stages of glycosylation. Glycosylation is an essential cellular process where carbohydrates are attached to proteins or lipids, influencing their folding, stability, and function. ALG13 plays a vital role in synthesizing the glycan precursor needed for proper protein glycosylation within the endoplasmic reticulum. Mutations in ALG13 are associated with congenital disorders of glycosylation, leading to various clinical issues such as developmental delays, epilepsy, and metabolic problems.