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- W4248997890 abstract "Abstract Background: Balanced complex chromosome rearrangements (BCCR) are balanced chromosomal structural aberrations that involve two or more chromosomes and at least three breakpoints. It is very rare in the population. The objective is to explore the difference of influence of three types of BCCR on early embryonic development and molecular karyotype. Results: Twelve couples were recruited including four couples of three-way rearrangements carriers (group A), three couples of double two-way translocations carriers (group B) and five couples of exceptional CCR carriers (group C). A total of 243 oocytes were retrieved in the seventeen preimplantation genetic testing (PGT) cycles, and 207 of these were available for fertilization. After intracytoplasmic sperm injection, 181 oocytes normally fertilized.The rates of embryos forming on day3 in three groups were 87.88%, 97.78% and 77.14%, which was significantly different (P=0.01). Compared with group B, the rate of embryo formation was statistically significantly lower in group C (P=0.01). Furthermore, the rates of high-quality blastocysts in three group were 14.71%, 48.15% and 62.96%, respectively, which was significantly different (P=0.00). Compared with group B and C, the rate of high-quality blastocysts in group A was statistically significantly lower (P=0.00; P=0.00). Comprehensive chromosome analysis was performed on 83 embryos, including 75 trophectoderm cells and 8 blastomeres. Except 7 embryos failed to amplify, 9.01% embryos were diagnosed as euploidy, and 90.91% were diagnosed as abnormal. As for group A, the euploid embryo rate was 10.71% and the abnormal embryo rate was 89.29%. In group B, the euploid embryo rate was 3.85%, the abnormal embryo rate was 96.15%. The euploid embryo rate was 13.04%, the abnormal embryo rate was 86.96% in group C. There were no significant differences among the three groups (P = 0.55). Conclusions: The double two-way translocations couples have more chance to get balanced or normal embryos probably, and there may be more high-quality blastocysts in exceptional CCRs, but the blastocyst formation rate was similar among the three type of BCCR. Different types of BCCR maybe have little effect on the embryonic molecular karyotype. The difference of influence of BCCR on early embryonic development and molecular karyotype should be further studied." @default.
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- W4248997890 date "2019-10-23" @default.
- W4248997890 modified "2023-09-26" @default.
- W4248997890 title "The influence of balanced complex chromosomal rearrangements on preimplantation embryonic development potential and molecular karyotype" @default.
- W4248997890 doi "https://doi.org/10.21203/rs.2.14678/v2" @default.
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