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B3GAT3
B3GAT3 Full Name
beta-1,3-glucuronyltransferase 3 (glucuronosyltransferase I)
B3GAT3 Introduction
B3GAT3 (beta-1,3-glucuronyltransferase 3, also known as glucuronosyltransferase I or GlcAT-I) is a critical glycosyltransferase involved in the biosynthesis of proteoglycans, which are essential components of the extracellular matrix (ECM). The B3GAT3 gene encodes the enzyme responsible for transferring a glucuronic acid (GlcA) residue from UDP-glucuronic acid to the tetrasaccharide linker region (Xyl-Gal-Gal-GlcA) attached to serine residues of core proteins. This final glucuronic acid addition step completes the common linkage structure required for the subsequent polymerization of glycosaminoglycan (GAG) chains, including chondroitin sulfate (CS), dermatan sulfate (DS), and heparan sulfate (HS). Because GAG-containing proteoglycans regulate tissue organization, cell signaling, mechanical strength, and developmental processes, impaired B3GAT3 activity can disrupt connective tissue integrity and lead to multisystem developmental abnormalities.
Pathogenic variants in B3GAT3 cause a group of inherited connective tissue disorders classified as proteoglycan biosynthesis defects or linkeropathies. Patients with B3GAT3 deficiency commonly present with skeletal abnormalities such as multiple joint dislocations, short stature, kyphoscoliosis, abnormal bone development, and craniofacial features. Reduced GlcAT-I activity results in decreased synthesis of functional proteoglycans and significantly lowers the levels of CS, DS, and HS in patient-derived fibroblasts, affecting extracellular matrix assembly and biomechanical properties. Beyond skeletal manifestations, affected individuals may develop cardiovascular complications, including bicuspid aortic valve, aortic root dilation, arterial tortuosity, and other vascular abnormalities, highlighting the importance of B3GAT3-mediated proteoglycan production in maintaining vascular extracellular matrix stability.
Recent genetic and clinical studies have expanded the understanding of the B3GAT3 disease spectrum, demonstrating that different pathogenic variants can produce variable phenotypes ranging from mild connective tissue features to severe multisystem disorders. Emerging evidence places B3GAT3 among genes associated with syndromic skeletal dysplasia and hereditary arteriopathies, emphasizing its role in extracellular matrix homeostasis and vascular remodeling. Improved recognition of B3GAT3-related disorders is important for early molecular diagnosis, genetic counseling, and monitoring of potential cardiovascular complications. As research continues to reveal the connection between glycosaminoglycan biosynthesis defects and human disease, B3GAT3 represents a valuable target for studying connective tissue biology, developmental regulation, and potential therapeutic strategies for inherited proteoglycan disorders.
Alternate Names for B3GAT3
B3GAT3; beta-1,3-glucuronyltransferase 3 (glucuronosyltransferase I); galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase 3; GlcAT I; glcUAT-I; Sqv-8-like protein; UDP-GlcUA:Gal beta-1,3-Gal-R glucuronyltransferase; GLCATI;
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