Table 1. Summary of patients examined in this study.

Patient	Genetic cause	UPD(14)pat subtype	Maternal age at childbirth (years)	Paternal age at childbirth (years)	Remark	Reference
1	UPD(14)pat	TR/GC [M1]	31	35		5
2	UPD(14)pat	TR/GC [M1]	28	29		5
3	UPD(14)pat	TR/GC [M1]	29	38		This report
4	UPD(14)pat	TR/GC [M1]	36	41		5
5	UPD(14)pat	TR/GC [M2]	30	30		This report
6	UPD(14)pat	MR/PE	42	Unknown		4,5
7	UPD(14)pat	MR/PE	31	28		5
8	UPD(14)pat	MR/PE	32	33		5
9	UPD(14)pat	MR/PE	26	35		5
10	UPD(14)pat	MR/PE	38	38		This report
11	UPD(14)pat	MR/PE	26	32		This report
12	UPD(14)pat	MR/PE	41	36		This report
13	UPD(14)pat	MR/PE	30	28		This report
14	UPD(14)pat	MR/PE	39	34		This report
15	UPD(14)pat	MR/PE	42	37	Born after IVF-ET	5
16	UPD(14)pat	MR/PE	36	36		4,5
17	UPD(14)pat-seg.	PE	27	24	Segmental isodisomy	4,5
18	Microdeletion		31	34		2
19	Microdeletion		33	36		2
20	Microdeletion		28	27		2
21	Microdeletion		27	37	IG-DMR alone	3
22	Microdeletion		25	25	MEG3-DMR alone	3
23	Epimutation		35	36		2
24	Epimutation		28	26		2
25	Epimutation		27	30		2
26	Epimutation		33	33		This report

Abbreviation: IVF-ET, in vivo fertilization-embryo transfer using parental gametes.

The microdeletions in patients 18–22 are different in size.