Blastocysts either diploid for chromosome copy number (20) or diagnosed as single- (40) or double aneuploid (10) were included after preparing the embryo into one ICM and three equal-sized TE sections. Accuracy of the aCGH was measured based on FISH reanalysis. Chromosomal segregations resulting in diploid/aneuploid mosaicism were classified as low-, medium- and high- grade and categorized with respect to their distribution (1TE, 2TE, 3TE, ICM or ALL embryo). Linear regression model was used to ACY-241 mouse test the relationship between the distributions and the proportion of aneuploid cells across the four embryo sections. Fishers exact test was used
to test for random allocation of aneuploid cells PFTα research buy between TE and ICM.\n\nAll ICM biopsy procedures displayed ICM cells in the recovered fraction with a mean number of ICM cells of 26.2 and a mean TE cell contamination rate of 2. By FISH reanalysis of previously aCGH-screened blastocysts, a total of 66 aneuploidies were scored, 52 (78.8) observed in all cells and 14 (21.2) mosaic. Overall, mosaic chromosomal errors were observed only in 11 out of 70 blastocysts (15.7) but only 2 cases were classified as mosaic diploid/aneuploid (2.9). Sensitivity and specificity of aCGH on TE clinical biopsies were 98.0 and 100 per embryo and 95.2 and 99.8 per chromosome, respectively. Linear regression analysis
performed on the 11 mosaic diploid/aneuploid Napabucasin mw chromosomal segregations showed a significant positive correlation between the distribution and the proportion of aneuploid cells
across the four-blastocyst sections (P 0.01). In addition, regression analysis revealed that both the grade and the distribution of mosaic abnormal cells were significantly correlated with the likelihood of being diagnosed by aCGH performed on clinical TE biopsies (P 0.019 and P 0.01, respectively). Fishers exact test for the 66 aneuploidies recorded showed no preferential allocation of abnormal cells between ICM and TE (P 0.33).\n\nThe study is limited to non-transferable embryos, reanalyzed for only nine chromosomes and excludes segmental imbalance and uniparental disomy. The prevalence of aneuploidy in the study group is likely to be higher than in the general population of clinical PGD embryos.\n\nThis study showed high accuracy of diagnosis achievable during blastocyst stage PGS cycles coupled with 24-chromosomes molecular karyotyping analysis. The new ICM isolation strategy developed may open new possibilities for basic research in embryology and for clinical grade derivation of human embryonic stem cells.\n\nNo specific funding was sought or obtained for this study.”
“Germinal center development, critical for long-term humoral immunity, requires the trafficking of T and B lymphocytes to defined tissues and locations after antigenic challenge.