Broadening the phenotypic spectrum of Beta3GalT6-associated phenotypes

Chiara Leoni, Marta Tedesco, Francesca Clementina Radio, Giovanni Chillemi, Antonio Leone, Alessandro Bruselles, Andrea Ciolfi, Emilia Stellacci, Francesca Pantaleoni, Gianfranco Butera, Donato Rigante, Roberta Onesimo, Marco Tartaglia, Giuseppe Zampino

Research output: Contribution to journalArticlepeer-review


Biallelic mutations in B3GALT6, coding for a galactosyltransferase involved in the synthesis of glycosaminoglycans (GAGs), have been associated with various clinical conditions, causing spondyloepimetaphyseal dysplasia with joint laxity type 1 (SEMDJL1 or SEMDJL Beighton type), Al-Gazali syndrome (ALGAZ), and a severe progeroid form of Ehlers-Danlos syndrome (EDSSPD2). In the 2017 Ehlers-Danlos syndrome (EDS) classification, Beta3GalT6-related disorders were grouped in the spondylodysplastic EDSs together with spondylodysplastic EDSs due to B4GALT7 and SLC39A13 mutations. Herein, we describe a patient with a previously unreported homozygous pathogenic B3GALT6 variant resulting in a complex phenotype more severe than spondyloepimetaphyseal dysplasia with joint laxity type 1, and having dural ectasia and aortic dilation as additionally associated features, further broadening the phenotypic spectrum of the Beta3GalT6-related syndromes. We also document the utility of repeating sequencing in patients with uninformative exomes, particularly when performed by using “first generations” enrichment capture methods.

Original languageEnglish
Pages (from-to)3153-3160
Number of pages8
JournalAmerican Journal of Medical Genetics, Part A
Issue number10
Publication statusPublished - Oct 2021


  • Al-Gazali syndrome
  • B3GALT6
  • Beta3GalT6
  • dural ectasia
  • spondylodysplastic Ehlers-Danlos syndrome
  • spondyloepimetaphyseal dysplasia with joint laxity type 1

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)


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