1. Eggermann T, Soellner L, Buiting K, et al: Mosaicism and uniparental disomy in prenatal diagnosis. Trends Mol Med 2015;21:77–87.
2. Ortega NM, Winblad N, Plaza Reyes A, et al: Functional genetics of early human development. Curr Opin Genet Dev 2018;52:1–6.
3. Macklon NS, Geraedts JP, Fauser BC: Conception to ongoing pregnancy: the ‘black box’ of early pregnancy loss. Hum Reprod Update 2002;8:333–343.
4. Los FJ, Van Opstal D, van den Berg C: The development of cytogenetically normal, abnormal and mosaic embryos: a theoretical model. Hum Reprod Update 2004;10:79– 94.
5. Babariya D, Fragouli E, Alfarawati S, et al: The incidence and origin of segmental aneuploidy in human oocytes and preimplantation embryos. Hum Reprod 2017;32:2549– 2560.
6. Irani M, Zaninovic N, Canon C, et al: A rationale for biopsying embryos reaching the morula stage on Day 6 in women undergoing preimplantation genetic testing for aneuploidy. Hum Reprod 2018;33:935–941.
7. Carbone L, & Chavez SL: Mammalian pre-implantation chromosomal instability: species comparison, evolutionary considerations, and pathological correlations. Syst Biol Reprod Med 2015:61:321–335.
8. Eckersley-Maslin MA, Alda-Catalinas C, Reik W: Dynamics of the epigenetic landscape during the maternal-to-zygotic transition. Nat Rev Mol Cell Biol 2018;19:436–450.
9. Ambartsumyan G, Clark AT: Aneuploidy and early human embryo development. Hum Mol Genet 2008;17:R10–15.
10. Fragouli E, Alfarawati S, Spath K, et al: The origin and impact of embryonic aneuploidy. Hum Genet 2013;132:1001–1013.
11. Engel E: A new genetic concept: uniparental disomy and its potential effect, isodisomy. Am J Hum Genet 1980;6:137–143.
12. Nicholls RD, Knoll JH, Butler MG, et al: Genetic imprinting suggested by maternal heterodisomy in non-deletion Prader-Willi syndrome. Nature 1989;342:281–285.
13. Spence J, Perciaccante R, Greig G, et al: Uniparental disomy as a mechanism for human genetic disease. Am J Hum Genet 1988;42:217.
14. Malcolm S, Clayton-Smith J, Nichols M, et al: Uniparental paternal disomy in Angelman's syndrome. Lancet 1991;337:694–697.
15. Robinson WP: Mechanisms leading to uniparental disomy and their clinical consequences. Bioessays 2000;22:452–459.
16. Cassidy SB: Prader-Willi syndrome. J Med Genet 1997;34:917–923.
17. Kagami M, Kurosawa K, Miyazaki O, et al: Comprehensive clinical studies in 34 patients with molecularly defined UPD(14)pat and related conditions (Kagami-Ogata syndrome). Eur J Hum Genet 2015;23:1488–1498.
18. Eggermann T, Wollmann HA, Kuner R, et al: Molecular studies in 37 Silver-Russell syndrome patients: frequency and etiology of uniparental disomy. Hum Genet 1997;100:415–419.
19. Kalousek DK, Vekemans M: Confined placental mosaicism. J Med Genet 1996;33:529– 533.
20. Nakka P, Smith SP, O’Donnell-Luria AH, et al: Characterization of prevalence and health consequences of uniparental disomy in four million individuals from the general population. Am J Hum Genet 2019;105:921–932.
21. Lyon MF: Gene action in the X-chromosome of the mouse (Mus musculus L.). Nature 1961;190:372–373.
22. Brown CJ, Robinson WP: The causes and consequences of random and non-random X chromosome inactivation in humans. Clin Genet 2000;58:353–363.
23. Barr ML, Bertram EG: A morphological distinction between neurones of the male and female, and the behaviour of the nucleolar satellite during accelerated nucleoprotein synthesis. Nature 1949;163:676–677.
24. Ohno S, Kaplan W, Kinosita R: Formation of the sex chromatin by a single X- chromosome in liver cells of Rattus norvegicus. Exp Cell Res 1959;18:415–418.
25. Ohno S, Hauschka T: Allocycly of the X-chromosome in tumors and normal tissues. Cancer Res 1960;20:541–545.
26. Belmont JW: Genetic control of X inactivation and processes leading to X-inactivation skewing. Am J Hum Genet 1996;58:1101–1108.
27. Amos-Landgraf JM, Cottle A, Plenge RM, et al: X chromosome-inactivation patterns of 1,005 phenotypically unaffected females. Am J Hum Genet 2006;79:493–499.
28. Monteiro J, Derom C, Vlietinck R, et al: Commitment to X inactivation precedes the twinning event in monochorionic MZ twins. Am J Hum Genet 1998;63:339–346.
29. Fialkow PJ: Primordial cell pool size and lineage relationships of five human cell types. Ann Hum Genet 1973;37:39–48.
30. Tonon L, Bergamaschi G, Dellavecchia C, et al: Unbalanced X-chromosome inactivation in haemopoietic cells from normal women. Br J Haematol 1998;102:996–1003.
31. Puck JM, Willard HF: X inactivation in females with X-linked disease. N Engl J Med 1998;338:325–328.
32. Robinson WP, Christian SL, Kuchinka BD, et al: Somatic segregation errors predominantly contribute to the gain or loss of a paternal chromosome leading to uniparental disomy for chromosome 15. Clin Genet 2000;57:349–358.
33. Bolduc V, Chagnon P, Provost S, et al: No evidence that skewing of X chromosome inactivation patterns is transmitted to offspring in humans. J Clin Invest 2008;118:333– 341.
34. Busque L, Mio R, Mattioli J, et al: Nonrandom X-inactivation patterns in normal females: lyonization ratios vary with age. Blood 1996;88:59–65.
35. Kristiansen M, Knudsen GP, Bathum L, et al: Twin study of genetic and aging effects on X chromosome inactivation. Eur J Hum Genet 2005;13:599–606.
36. Ørstavik KH: X chromosome inactivation in clinical practice. Hum Genet 2009;126:363–373.
37. Butler MG, Theodoro MF, Bittel DC, et al: X-chromosome inactivation patterns in females with Prader-Willi syndrome. Am J Med Genet A 2007;143A:469–475.
38. Kurosawa K, Sasaki H, Sato Y, et al: Paternal UPD14 is responsible for a distinctive malformation complex. Am J Med Genet 2002;110:268–272.
39. Fuke T, Mizuno S, Nagai T, et al: Molecular and clinical studies in 138 Japanese patients with Silver-Russell syndrome. PLoS One 2013;8:e60105.
40. Matsubara K, Murakami N, Fukami M, et al: Risk assessment of medically assisted reproduction and advanced maternal ages in the development of Prader-Willi syndrome due to UPD(15)mat. Clin Genet 2016;89:614–619.
41. Kagami M, Nagasaki K, Kosaki R, et al: Temple syndrome: comprehensive molecular and clinical findings in 32 Japanese patients. Genet Med 2017;19:1356–66.
42. Kawashima S, Nakamura A, Inoue T, et al: Maternal Uniparental Disomy for Chromosome 20: Physical and Endocrinological Characteristics of Five Patients. J Clin Endocrinol Metab 2018;103:2083–2088.
43. Allen RC, Zoghbi H, Moseley A, et al: Methylation of HpaII and HhaI sites near the polymorphic CAG repeat in the human androgen-receptor gene correlates with X chromosome inactivation. Am J Hum Genet 1992;51:1229.
44. Gelman A, Carlin JB, Stern HS, et al. Bayesian data analysis: CRC press; 2013.
45. Lau AW, Brown CJ, Penaherrera M, et al: Skewed X-chromosome inactivation is common in fetuses or newborns associated with confined placental mosaicism. Am J Hum Genet 1997;61:1353–1361.
46. Morris SA, Guo Y, Zernicka-Goetz M: Developmental plasticity is bound by pluripotency and the Fgf and Wnt signaling pathways. Cell Rep 2012;2:756–765.
47. Noli L, Dajani Y, Capalbo A, et al: Developmental clock compromises human twin model created by embryo splitting. Hum Reprod 2015;30:2774–2784.
48. Geens M, Chuva De Sousa Lopes SM: X chromosome inactivation in human pluripotent stem cells as a model for human development: back to the drawing board? Hum Reprod Update 2017;23:520–532.
49. Bamforth F, Machin G, Innes M: X‐chromosome inactivation is mostly random in placental tissues of female monozygotic twins and triplets. Am J Hum Genet 1996;61:209–215.
50. Hall JG: Twinning. Lancet 2003;362:735–743.
51. Strachan T, Read A. Principles of development. Human Molecular Genetics: Garland Science; 2010.
52. Horsthemke B, Nazlican H, Hüsing J, et al: Somatic mosaicism for maternal uniparental disomy 15 in a girl with Prader–Willi syndrome: confirmation by cell cloning and identification of candidate downstream genes. Hum Mol Genet 2003;12:2723–2732.
53. Cortessis VK, Azadian M, Buxbaum J, et al: Comprehensive meta-analysis reveals association between multiple imprinting disorders and conception by assisted reproductive technology. J Assist Reprod Genet 2018;35:943–952.
54. Matsubara K, Murakami N, Nagai T, et al: Maternal age effect on the development of Prader–Willi syndrome resulting from upd (15) mat through meiosis 1 errors. J Hum Genet 2011;56:566–571.
55. Lee JT, Bartolomei MS: X-inactivation, imprinting, and long noncoding RNAs in health and disease. Cell 2013;152:1308–323.
56. Beever C, Stephenson M, Penaherrera M, et al: Skewed X-chromosome inactivation is associated with trisomy in women ascertained on the basis of recurrent spontaneous abortion or chromosomally abnormal pregnancies. Am J Hum Genet 2003;72:399–407.
57. Talebizadeh Z, Bittel D, Veatch O, et al: Brief report: non-random X chromosome inactivation in females with autism. J Autism Dev Disord 2005;35:675–681.