MONDO_0012052 (ALG1-congenital disorder of glycosylation) is a severe form of congenital disorders of N-linked glycosylation characterized by severe developmental and psychomotor delay, muscular hypotonia, intractable early-onset seizures, and microcephaly. Additional features include altered blood coagulation with a high probability of hemorrhages or thromboses, nephrotic syndrome, ascites, hepatomegaly, cardiomyopathy, ocular manifestations (strabismus, nystagmus), and immunodeficiency. The disease is caused by loss-of-function mutations in the gene ALG1 (16p13.3). Also known as: ALG1-CDG, CDG syndrome type Ik, CDG-Ik, CDG1K, carbohydrate deficient glycoprotein syndrome type Ik, congenital disorder of glycosylation type 1k, congenital disorder of glycosylation type Ik, mannosyltransferase 1 deficiency.