B4GALT7 and linkeropathy: To date, five genes, encoding various glycosyltransferases, have been linked to linkeropathies; besides the XYLT2 gene, there are the genes XYLT1 (OMIM * 608124), B4GALT7 (OMIM * 604327), B3GAT3 (OMIM * 606374), and B3GALT6 (MIM:* 615291) [22].