Figure 2: The MLPA analysis of AS child case 2. The genetic DNAs extracted from the blood samples of case 2 (corresponding to Figs. 1D–F) and the child's parents underwent MLPA analysis to detect the heterozygous deletion of SNRPN, TUBGCP5, UBE3A, MKRN3, GABRB3, ATP10A, MAGEL2, NDN, and NIPA genes in the PWS/AS related regions of chromosome 15q11. The data of A and B reveals the MLPA results of case 2, C and D presents the results of the mother of case 2, and E and F presents the results of the father of case 2. Low methylation in the SNRPN-in01a, SNRPN-E1, SNRPN-in01b, SNRPN-promoter, and NDNa area was observed, as indicated by the box in the case 2 patient (A and B) and the mother (C and D), indicating that case 2 belonged to the maternal origin deletion. AS = Angelman syndrome, MLPA = multiplex ligation-dependent probe amplification