NANS-mediated synthesis of sialic acid is required for brain and skeletal development
- PMID: 27213289
- DOI: 10.1038/ng.3578
NANS-mediated synthesis of sialic acid is required for brain and skeletal development
Erratum in
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Corrigendum: NANS-mediated synthesis of sialic acid is required for brain and skeletal development.Nat Genet. 2017 May 26;49(6):969. doi: 10.1038/ng0617-969a. Nat Genet. 2017. PMID: 28546570 No abstract available.
Abstract
We identified biallelic mutations in NANS, the gene encoding the synthase for N-acetylneuraminic acid (NeuNAc; sialic acid), in nine individuals with infantile-onset severe developmental delay and skeletal dysplasia. Patient body fluids showed an elevation in N-acetyl-D-mannosamine levels, and patient-derived fibroblasts had reduced NANS activity and were unable to incorporate sialic acid precursors into sialylated glycoproteins. Knockdown of nansa in zebrafish embryos resulted in abnormal skeletal development, and exogenously added sialic acid partially rescued the skeletal phenotype. Thus, NANS-mediated synthesis of sialic acid is required for early brain development and skeletal growth. Normal sialylation of plasma proteins was observed in spite of NANS deficiency. Exploration of endogenous synthesis, nutritional absorption, and rescue pathways for sialic acid in different tissues and developmental phases is warranted to design therapeutic strategies to counteract NANS deficiency and to shed light on sialic acid metabolism and its implications for human nutrition.
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