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XCI in females is an indispensable process, which is predicted to start at the early-blastocyst phase.<\/jats:p><\/jats:sec><jats:sec><jats:title>STUDY DESIGN, SIZE, DURATION<\/jats:title><jats:p>We examined the frequency of XCI skewness in young females who carried full uniparental disomy (UPD) resulting from MR or TR\/gamete complementation (GC). The results were statistically analyzed using a theoretical model in which XCI involves various numbers of embryonic progenitor cells.<\/jats:p><\/jats:sec><jats:sec><jats:title>PARTICIPANTS\/MATERIALS, SETTING, METHODS<\/jats:title><jats:p>We studied 39 children and young adults ascertained by imprinting disorders. XCI ratios were determined by DNA methylation analysis of a polymorphic locus in the androgen receptor gene. We used Bayesian approach to assess the probability of the occurrence of extreme XCI skewness in the MR and TR\/GC groups using a theoretical model of 1\u201312 cell pools.<\/jats:p><\/jats:sec><jats:sec><jats:title>MAIN RESULTS AND THE ROLE OF CHANCE<\/jats:title><jats:p>A total of 12 of 39 individuals (31%) showed skewed XCI. Extreme skewness was observed in 3 of 15 MR cases (20%) and 1 of 24 TR\/GC cases (4.2%). Statistical analysis indicated that XCI in the MR group was likely to have occurred when the blastocyst contained three or four euploid embryonic progenitor cells. The estimated size of the embryonic progenitor cell pools was approximately one-third or one-fourth of the predicted size of normal embryos. The TR\/GC group likely had a larger pool size at the onset of XCI, although the results remained inconclusive.<\/jats:p><\/jats:sec><jats:sec><jats:title>LIMITATIONS, REASONS FOR CAUTION<\/jats:title><jats:p>This is an observational study and needs to be validated by experimental analyses.<\/jats:p><\/jats:sec><jats:sec><jats:title>WIDER IMPLICATIONS OF THE FINDINGS<\/jats:title><jats:p>This study provides evidence that the onset of XCI is determined by an intrinsic clock, irrespectively of the number of embryonic progenitor cells. Our findings can also be applied to individuals without UPD or imprinting disorders. This study provides a clue to understand chromosomal and cellular dynamics in the first few days of human development, their effects on XCI skewing and the possible implications for the expression of X-linked diseases in females.<\/jats:p><\/jats:sec><jats:sec><jats:title>STUDY FUNDING\/COMPETING INTEREST(S)<\/jats:title><jats:p>This study was supported by the Grants-in-aid for Scientific Research on Innovative Areas (17H06428) and for Scientific Research (B) (17H03616) from Japan Society for the Promotion of Science (JSPS), and grants from Japan Agency for Medical Research and Development (AMED) (18ek0109266h0002 and 18ek0109278h0002), National Center for Child Health and Development and Takeda Science Foundation. The authors declare no conflict of interest.<\/jats:p><\/jats:sec><jats:sec><jats:title>TRIAL REGISTRATION NUMBER<\/jats:title><jats:p>Not applicable.<\/jats:p><\/jats:sec>","DOI":"10.1093\/humrep\/dez117","type":"journal-article","created":{"date-parts":[[2019,6,13]],"date-time":"2019-06-13T11:10:46Z","timestamp":1560424246000},"page":"1762-1769","source":"Crossref","is-referenced-by-count":5,"title":["Aneuploid rescue precedes X-chromosome inactivation and increases the incidence of its skewness by reducing the size of the embryonic progenitor cell pool"],"prefix":"10.1093","volume":"34","author":[{"given":"T","family":"Yoshida","sequence":"first","affiliation":[{"name":"Department of Molecular Endocrinology, National Research Institute for Child Health and Development, 157-8535 Tokyo, Japan"},{"name":"Department of Advanced Pediatric Medicine, Tohoku University School of Medicine, 157-8535 Tokyo, 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