The heterozygous deletion of the SNRPN, TUBGCP5, UBE3A, MKRN3, GABRB3, ATP10A, MAGEL2, NDN, and NIPA genes in the Prader-Willi syndrome (PWS)/AS-related regions of chromosome 15q11 was analyzed by MLPA from the genetic DNAs extracted from the blood sample of the patient and the patient's parents. The gene discussed is TUBGCP5; the disease is Prader-Willi syndrome.