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B3GAT3

Chr 11q12.3

beta-1,3-glucuronyltransferase 3

Aliases:
GlcAT-I
MANE:
ENST00000265471.10

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Predicted protein structure

Clinical relevance (Genomics England PanelApp)

Diagnostic Grade (Green)

  • Congenital disorders of glycosylation

    BIALLELIC, autosomal or pseudoautosomal
  • Fetal anomalies

    BIALLELIC, autosomal or pseudoautosomal
  • Likely inborn error of metabolism

    BIALLELIC, autosomal or pseudoautosomal
  • Rare syndromic craniosynostosis or isolated multisuture synostosis

    BIALLELIC, autosomal or pseudoautosomal
  • Skeletal dysplasia

    BIALLELIC, autosomal or pseudoautosomal
  • Undiagnosed metabolic disorders

    BIALLELIC, autosomal or pseudoautosomal
  • Childhood onset dystonia, chorea or related movement disorder

  • Clefting

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Disease associations (Open Targets)

  • Larsen-like syndrome, B3GAT3 type

    0.80
  • Autosomal dominant Larsen syndrome

    0.37
  • congenital heart disease

    0.37
  • Abnormality of the skeletal system

    0.29
  • hereditary disease

    0.19
  • irritable bowel syndrome

    0.11
  • familial digital arthropathy-brachydactyly

    0.09
  • brachydactyly-syndactyly syndrome

    0.09
  • tibia, hypoplasia or aplasia of, with polydactyly

    0.09
  • Absent tibia - polydactyly

    0.09

Score is the Open Targets composite evidence score (0-1). Higher = stronger gene-disease association.

Protein function (UniProt)

Galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase 3

Glycosaminoglycans biosynthesis (PubMed:25893793). Involved in forming the linkage tetrasaccharide present in heparan sulfate and chondroitin sulfate. Transfers a glucuronic acid moiety from the uridine diphosphate-glucuronic acid (UDP-GlcUA) to the common linkage region trisaccharide Gal-beta-1,3-Gal-beta-1,4-Xyl covalently bound to a Ser residue at the glycosaminylglycan attachment site of proteoglycans. Can also play a role in the biosynthesis of l2/HNK-1 carbohydrate epitope on glycoproteins. Shows strict specificity for Gal-beta-1,3-Gal-beta-1,4-Xyl, exhibiting negligible incorporation into other galactoside substrates including Galbeta1-3Gal beta1-O-benzyl, Galbeta1-4GlcNAc and Galbeta1-4Glc. Stimulates 2-phosphoxylose phosphatase activity of PXYLP1 in presence of uridine diphosphate-glucuronic acid (UDP-GlcUA) during completion of linkage region formation (PubMed:24425863)

Data sources: HGNC (CC BY 4.0), AlphaFold (CC BY 4.0, Jumper et al. Nature 2021), Genomics England PanelApp (CC BY 4.0), ClinGen, Open Targets (CC0), UniProt.

Not for sole clinical decision-making. Always verify against primary sources.