Kabuki syndrome in son and low grade mosaic 45,X/46,XX in mother

We report on a two-year-old boy with Kabuk syndrome and a normal male karyotype whose mother is a low grade mosaic 45,X/46,XX. We hypothesized that the son's Kabuki syndrome might have been caused by gonosomal uniparental (paternal) disomy DNA analysis proved this hypothesis to be incorrect. A review of twelve patients with Kabuki syndrome or Kabuki-syndrome-like features and chromosome abnormalities is presented.