{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,25]],"date-time":"2026-08-25T11:31:52Z","timestamp":1787657512175,"version":"build-2736575974"},"reference-count":92,"publisher":"Oxford University Press (OUP)","issue":"4","license":[{"start":{"date-parts":[[2024,2,2]],"date-time":"2024-02-02T00:00:00Z","timestamp":1706832000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/pages\/standard-publication-reuse-rights"}],"funder":[{"DOI":"10.13039\/501100001872","name":"Centro para el Desarrollo Tecnol\u00f3gico Industrial","doi-asserted-by":"publisher","award":["20190022"],"award-info":[{"award-number":["20190022"]}],"id":[{"id":"10.13039\/501100001872","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003359","name":"Generalitat Valenciana","doi-asserted-by":"publisher","award":["APOTIP\/2019\/009"],"award-info":[{"award-number":["APOTIP\/2019\/009"]}],"id":[{"id":"10.13039\/501100003359","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004587","name":"Instituto de Salud Carlos III","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100004587","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100008530","name":"European Regional Development Fund","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100008530","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003359","name":"Generalitat Valenciana","doi-asserted-by":"publisher","award":["CIAPOT\/2021\/6"],"award-info":[{"award-number":["CIAPOT\/2021\/6"]}],"id":[{"id":"10.13039\/501100003359","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003359","name":"Generalitat Valenciana","doi-asserted-by":"publisher","award":["CIACIF\/2021\/011"],"award-info":[{"award-number":["CIACIF\/2021\/011"]}],"id":[{"id":"10.13039\/501100003359","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2024,4,3]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:sec>\n                  <jats:title>STUDY QUESTION<\/jats:title>\n                  <jats:p>Are there cell lineage-related differences in the apoptotic rates and differentiation capacity of human blastocysts diagnosed as euploid, mosaic, and aneuploid after preimplantation genetic testing for aneuploidy (PGT-A) based on concurrent copy number and genotyping analysis?<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>SUMMARY ANSWER<\/jats:title>\n                  <jats:p>Trophectoderm (TE) cells of mosaic and aneuploid blastocysts exhibit significantly higher levels of apoptosis and significantly reduced differentiation capacity compared to those of euploid blastocysts.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>WHAT IS KNOWN ALREADY<\/jats:title>\n                  <jats:p>Embryos diagnosed as mosaic after PGT-A can develop into healthy infants, yet understanding the reasons behind their reproductive potential requires further research. One hypothesis suggests that mosaicism can be normalized through selective apoptosis and reduced proliferation of aneuploid cells, but direct evidence of these mechanisms in human embryos is lacking. Additionally, data interpretation from studies involving mosaic embryos has been hampered by retrospective analysis methods and the high incidence of false-positive mosaic diagnoses stemming from the use of poorly specific PGT-A platforms.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>STUDY DESIGN, SIZE, DURATION<\/jats:title>\n                  <jats:p>Prospective cohort study performing colocalization of cell-lineage and apoptotic markers by immunofluorescence (IF). We included a total of 64 human blastocysts donated to research on Day 5 or 6 post-fertilization (dpf) by 43 couples who underwent in vitro fertilization treatment with PGT-A at IVI-RMA Valencia between September 2019 and October 2022. A total of 27 mosaic blastocysts were analyzed.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>PARTICIPANTS\/MATERIALS, SETTING, METHODS<\/jats:title>\n                  <jats:p>The study consisted of two phases: Phase I (caspase-3, n\u2009=\u200953 blastocysts): n\u2009=\u200913 euploid, n\u2009=\u200922 mosaic, n\u2009=\u200918 aneuploid. Phase II (terminal deoxynucleotidyl transferase dUTP nick end labelling (TUNEL), n\u2009=\u200911 blastocysts): n\u2009=\u20092 euploid, n\u2009=\u20095 mosaic, n\u2009=\u20094 aneuploid. Following donation for research, vitrified blastocysts were warmed, cultured until re-expansion, fixed, processed for IF, and imaged using confocal microscopy. For each blastocyst, the following cell counts were conducted: total cells (DAPI+), TE cells (GATA3+), inner cell mass (ICM) cells (GATA3\u2212\/NANOG+), and apoptotic cells (caspase-3+ or TUNEL+). The incidence of apoptosis was calculated for each blastocyst by dividing the number of caspase-3+ cells (Phase I) or TUNEL+ cells (Phase II) by the number of TE or ICM cells. Statistical analysis was performed according to data type and distribution (P\u2009&amp;lt;\u20090.05 was considered statistically significant).<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>MAIN RESULTS AND THE ROLE OF CHANCE<\/jats:title>\n                  <jats:p>Phase I: Mosaic blastocysts displayed a similar number of total cells (49.6\u2009\u00b1\u200915 cells at 5 dpf; 58.8\u2009\u00b1\u200916.9 cells at 6 dpf), TE cells (38.8\u2009\u00b1\u200913.7 cells at 5 dpf; 49.2\u2009\u00b1\u200916.2 cells at 6 dpf), and ICM cells (10.9\u2009\u00b1\u20094.2 cells at 5 dpf; 9.7\u2009\u00b1\u20097.1 cells at 6 dpf) compared to euploid and aneuploid blastocysts (P\u2009&amp;gt;\u20090.05). The proportion of TE cells retaining NANOG expression increased gradually from euploid blastocysts (9.7%\u2009=\u200963\/651 cells at 5 dpf; 0%\u2009=\u20090\/157 cells at 6 dpf) to mosaic blastocysts (13.1%\u2009=\u2009104\/794 cells at 5 dpf; 3.4%\u2009=\u200912\/353 cells at 6 dpf) and aneuploid blastocysts (27.9%\u2009=\u2009149\/534 cells at 5 dpf; 4.6%\u2009=\u200919\/417 cells at 6 dpf) (P\u2009&amp;lt;\u20090.05). At the TE level, caspase-3+ cells were frequently observed (39%\u2009=\u2009901\/2310 cells). The proportion of caspase-3+ TE cells was significantly higher in mosaic blastocysts (44.1% \u00b1 19.6 at 5 dpf; 43% \u00b1 16.8 at 6 dpf) and aneuploid blastocysts (45.9% \u00b1 16.1 at 5 dpf; 49% \u00b1 15.1 at 6 dpf) compared to euploid blastocysts (26.6% \u00b1 16.6 at 5 dpf; 17.5% \u00b1 14.8 at 6 dpf) (P\u2009&amp;lt;\u20090.05). In contrast, at the ICM level, caspase-3+ cells were rarely observed (1.9%\u2009=\u200911\/596 cells), and only detected in mosaic blastocysts (2.6%\u2009=\u20096\/232 cells) and aneuploid blastocysts (2.5%\u2009=\u20095\/197 cells) (P\u2009&amp;gt;\u20090.05). Phase II: Consistently, TUNEL+ cells were only observed in TE cells (32.4%\u2009=\u2009124\/383 cells). An increasing trend was identified toward a higher proportion of TUNEL+ cells in the TE of mosaic blastocysts (37.2% \u00b1 21.9) and aneuploid blastocysts (39% \u00b1 41.7), compared to euploid blastocysts (23% \u00b1 32.5), although these differences did not reach statistical significance (P\u2009&amp;gt;\u20090.05).<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>LIMITATIONS, REASONS FOR CAUTION<\/jats:title>\n                  <jats:p>The observed effects on apoptosis and differentiation may not be exclusive to aneuploid cells. Additionally, variations in aneuploidies and unexplored factors related to blastocyst development and karyotype concordance may introduce potential biases and uncertainties in the results.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>WIDER IMPLICATIONS OF THE FINDINGS<\/jats:title>\n                  <jats:p>Our findings demonstrate a cell lineage-specific effect of aneuploidy on the apoptotic levels and differentiation capacity of human blastocysts. This contributes to unravelling the biological characteristics of mosaic blastocysts and supports the concept of clonal depletion of aneuploid cells in explaining their reproductive potential.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>STUDY FUNDING\/COMPETING INTEREST(S)<\/jats:title>\n                  <jats:p>This work was funded by grants from Centro para el Desarrollo Tecnol\u00f3gico Industrial (CDTI) (20190022) and Generalitat Valenciana (APOTIP\/2019\/009). None of the authors has any conflict of interest to declare.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>TRIAL REGISTRATION NUMBER<\/jats:title>\n                  <jats:p>N\/A.<\/jats:p>\n               <\/jats:sec>","DOI":"10.1093\/humrep\/deae009","type":"journal-article","created":{"date-parts":[[2024,2,3]],"date-time":"2024-02-03T16:36:28Z","timestamp":1706978188000},"page":"709-723","source":"Crossref","is-referenced-by-count":9,"title":["Trophectoderm cells of human mosaic embryos display increased apoptotic levels and impaired differentiation capacity: a molecular clue regarding their reproductive fate?"],"prefix":"10.1093","volume":"39","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3026-9214","authenticated-orcid":false,"given":"\u00c1ngel","family":"Mart\u00edn","sequence":"first","affiliation":[{"name":"Department of Innovation, IVIRMA Global Research Alliance, IVI Foundation, Health Research Institute La Fe , 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