Fig. 4From: Prenatal diagnosis of complete maternal uniparental isodisomy of chromosome 4 in a fetus without congenital abnormality or inherited disease-associated variationsChAS software directly indicates the origin of the isodisomic UPD. After comparing the genotyping results between the fetus and his parents, ChAS software clearly indicated that the UPD of chromosome 4 in the fetus originated from the mother. At position chr4:3,418,266, the genotyping was BB, AA and AB in the fetus, his father and his mother, respectively, which indicates that the B allele in the fetus was duplicated from his mother. There are many different alleles that can be used to identify the origin of chromosome 4 in the fetus (red arrows)Back to article page