DK1-CDG is characterised by muscular hypotonia and ichthyosis. It has been described in four children from two consanguineous families. All the affected children died during early infancy, two from dilated cardiomyopathy. The syndrome is caused by a deficiency in dolichol kinase 1 (DK1), an enzyme involved in the <i>de novo</i> biosynthesis of dolichol phosphate. The mutations identified in the <i>DK1</i> gene led to a 96 to 98% reduction in DK activity.
