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Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

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Bovine granulosa cells of dominant follicles; comparison of plateau vs atretic

ABSTRACT: Granulosa cells originating from two different phases of antral follicle growth (plateau and atretic) were compared in follicles with a diameter of 9mm or more. The plateau follicle is the reference. Two conditions experiment (Plateau and Atretic); Four biological replicates for each group; Two technical replicates per samples (dye-swap).

ORGANISM(S): Bos taurus

SUBMITTER: Annie Girard

PROVIDER: E-GEOD-63919 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Bovine granulosa cells of dominant follicles; comparison of growing vs plateau

Project description:Granulosa cells originating from two different phases of antral follicle growth (growing and plateau) were compared in follicles with a diameter of 9mm or more. Growing follicle is the reference. Two conditions experiment (Growing and Plateau); Four biological replicates for each group; Two technical replicates per samples (dye-swap).

2015-03-06 | E-GEOD-63904 | biostudies-arrayexpress

Bovine granulosa cells of dominant follicles; comparison of plateau vs atretic

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Bovine granulosa cells of dominant follicles; comparison of growing vs atretic

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Project description:The study aimed to identify miRNAs expression profiles associated with growth and regression of dominant-size follicles in bovine. Follicles were collected from abattoir ovaries and their status (healthy/atretic) was assessed by measuring steroid levels and aromatase expression. Total RNA was isolated from whole follicles at different developmental stages. An heterologous microarray (Exiqon, Denmark) approach followed by RT-qPCR validation (Qiagen, UK) was used to identify and compare miRNA profiles between large healthy follicles (diameter, 13M-bM-^@M-^S16 mm, n=6) and each of small (4M-bM-^@M-^S8 mm, n=6 pools of follicles) and large atretic folllicles (13-16 mm, n=6). RNA from the above groups was hybridized to the miRCURY LNAM-bM-^DM-" microRNA Hi-Power Labeling Kit,Hy3M-bM-^DM-"/Hy5M-bM-^DM-" (Exiqon) and hybridized on the miRCURY LNAM-bM-^DM-" microRNA Array (6th gen). A total of 17 and 57 microRNAs were differentially expressed (> 2 fold, adj. P-value < 0.05) between Large Healthy and each of Small and Large Atretic follicles, respectively, a fraction of which corresponded to registered bovine miRNA sequences. A subset of 5 bovine miRNAs (miR-144, miR-202,vmiR-451, miR-652, miR-873) were confirmed by qPCR to be upregulated in Large Healthy follicles, were enriched in mural granulosa cells and their predicted targets mapped to genes involved in follicular cell proliferation and differentiation, suggesting an involvemet of this subset of microRNAs in ovarian follicle development. Six biological replicates per developmental stage (total of 18 samples) were used in a double dye microRNA microarray experiment. Samples were distributed among slides so that each experimental group was represented at least once in each slide. For each gene, mean normalized intensities (n= 6 biological replicates/group) were compared between follicle stages (SF vs LHF and LHF vs LAF).

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