Table 1.

All Three Subtypes of UPD

	isoUPD	hetUPD	Partial isoUPD	Total
matUPD	20	45	69	134
patUPD	35	31	5	71
Total	55	76	74	205

We identified all three subtypes of UPD in the 205 instances of UPD identified from 916,712 parent-child duos from the 23andMe dataset. We found that paternal partial isoUPD is the least common subtype of UPD. We also observed overall more hetUPD and partial isoUPD case subjects than isoUPD case subjects.