Any spondyloepimetaphyseal dysplasia with joint laxity in which the cause of the disease is a mutation in the B3GALT6 gene. The disease is MONDO_0010075 (spondyloepimetaphyseal dysplasia with joint laxity, type 1, with or without fractures). Also known as: B3GALT6 spondyloepimetaphyseal dysplasia with joint laxity, SEMDJL1, spondyloepimetaphyseal dysplasia with joint laxity caused by mutation in B3GALT6, spondyloepimetaphyseal dysplasia with joint laxity, Beighton type.