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- W2621423478 abstract "The objective of this study was to investigate if the number of antral follicles (AF) is correlated with oocyte competence. Ovaries (n = 712) from Nelore cows (n = 356) were obtained at the slaughterhouse and divided in groups according to the number of antral follicles. The mean quantity of follicles was 61.14 ± 30.43 per cow. The experimental groups were defined as: females with ≤ 31 AF (mean number – SD); 46-76 AF (mean number ± ½ SD); and ≥ 92 AF (mean number + SD). Cumulus-oocyte complexes (COCs) were collected from each group, matured, fertilized and cultured in vitro to assess developmental competence to the blastocyst stage. COCs (n = 180) were used to quantify mRNA expression by qRT-PCR in 3 replicates. Total RNA was extracted from granulosa and cumulus cells using Trizol. RNA purity and quantity were determined using a Nano-Drop spectrophotometer, and then 200 ng total RNA per sample was reverse transcribed using the iScript cDNA synthesis kit (BioRad, ON, Canada). Quantitative Real time PCR was performed using a CFX384TM Real-Time System (BioRad) and iQ SYBR Green Supermix (BioRad). mRNA abundance of tested genes was normalized to the average of the internal control genes RP18S and Cyclophilin. Data were submitted to ANOVA and the averages compared by Tukey’s HSD test. Embryo development data were analyzed by logistic regression and differences were considered statistically significant if P < 0.05. There was no difference between groups for cleavage and development to the blastocyst stage. In cumulus cells, samples from cows with ≤ 31 AF had higher mRNA abundance of genes involved in meiosis resumption (NPR-2 and NPR-3), estradiol biosynthesis (CYP19A1), cumulus cells expansion (FGF10), and transcription factors that regulate oocyte maturation and cell proliferation (STAT3 and FOXO3a). There was no difference in mRNA abundance of STAR (involved in steroidogenesis), NPR-1, PGRMC1, PGR (involved in meiosis resumption), LIFRα (transcription factor that regulate oocyte maturation and cell proliferation), FGF2Rb, FSHR, BMPR2, AMH, AMHR2 and TGFsR1 (involved in cumulus cells expansion) in cumulus cells. In granulosa cells, NPR-1 mRNA levels (involved in meiosis resumption) were higher in the group with ≥ 92 AF. Findings from this study revealed molecular differences related to meiosis resumption, synthesis of estradiol, cumulus cells expansion, oocyte maturation and cell proliferation in cumulus cells of Nelore cows of low vs. high number of AF." @default.
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- W2621423478 date "2016-03-01" @default.
- W2621423478 modified "2023-09-26" @default.
- W2621423478 title "Expression of genes involved in oocyte competence is higher in cumulus cells of Nelore cows with low compared to high number of antral follicle" @default.
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