Multiple Displacement Amplification - Limitations - Allelic Dropout (ADO)

Allelic Dropout (ADO)

ADO is defined as the random non-amplification of one of the alleles present in a heterozygous sample. Some studies have reported the ADO rate of the MDA products to be 0–60%. This drawback decreases the accuracy of genotyping of single sample and misdiagnosis in other MDA involved applications. ADO appears to be independent of the fragment sizes and has been reported to have similar rate in other single-cell techniques. Possible solutions are the use of different lysis conditions or to carry out multiple rounds of amplifications from the diluted MDA products since PCR mediated amplification from cultured cells has been reported to give lower ADO rates.