Genotype–Phenotype Differences
See Table 1 . There is limited information to be gained from such a review as the numbers of patients with epigenetic aberrations and paternal deletions are low. However, of interest, premature delivery was seen only in maternal UPD 14 cases. Speech delay was reported in 100% of cases with an epigenetic or paternal deletion compared with 45% in cases with maternal UPD 14. Note that patients with normal intellect were reported in all three subgroups.