title: The expression pattern of microRNAs in granulosa cells of subordinate and dominant follicles during the early luteal phase of the bovine estrous cycle.
abstract: This study aimed to investigate the miRNA expression patterns in granulosa cells of subordinate (SF) and dominant follicle (DF) during the early luteal phase of the bovine estrous cycle. For this, miRNA enriched total RNA isolated from granulosa cells of SF and DF obtained from heifers slaughtered at day 3 and day 7 of the estrous cycle was used for miRNAs deep sequencing. The results revealed that including 17 candidate novel miRNAs, several known miRNAs (n = 291-318) were detected in SF and DF at days 3 and 7 of the estrous cycle of which 244 miRNAs were common to all follicle groups. The let-7 families, bta-miR-10b, bta-miR-26a, bta-miR-99b and bta-miR-27b were among abundantly expressed miRNAs in both SF and DF at both days of the estrous cycle. Further analysis revealed that the expression patterns of 16 miRNAs including bta-miR-449a, bta-miR-449c and bta-miR-222 were differentially expressed between the granulosa cells of SF and DF at day 3 of the estrous cycle. However, at day 7 of the estrous cycle, 108 miRNAs including bta-miR-409a, bta-miR-383 and bta-miR-184 were differentially expressed between the two groups of granulosa cell revealing the presence of distinct miRNA expression profile changes between the two follicular stages at day 7 than day 3 of the estrous cycle. In addition, unlike the SF, marked temporal miRNA expression dynamics was observed in DF groups between day 3 and 7 of the estrous cycle. Target gene prediction and pathway analysis revealed that major signaling associated with follicular development including Wnt signaling, TGF-beta signaling, oocyte meiosis and GnRH signaling were affected by differentially expressed miRNAs. Thus, this study highlights the miRNA expression patterns of granulosa cells in subordinate and dominant follicles that could be associated with follicular recruitment, selection and dominance during the early luteal phase of the bovine estrous cycle.
authors.affiliation: Institute of Animal Science, Animal Breeding and Husbandry Group, University of Bonn, Bonn, Germany.
authors.forename: Dessie
authors.initials: D
authors.lastname: Salilew-Wondim
authors.affiliation: Institute of Animal Science, Animal Breeding and Husbandry Group, University of Bonn, Bonn, Germany.
authors.forename: Ijaz
authors.initials: I
authors.lastname: Ahmad
authors.affiliation: Institute of Animal Science, Animal Breeding and Husbandry Group, University of Bonn, Bonn, Germany.
authors.forename: Samuel
authors.initials: S
authors.lastname: Gebremedhn
authors.affiliation: Institute of Animal Science, Animal Breeding and Husbandry Group, University of Bonn, Bonn, Germany.
authors.forename: Sudeep
authors.initials: S
authors.lastname: Sahadevan
authors.affiliation: Department of Animal Breeding and Genetics, Bangladesh Agricultural University, Mymensingh, Bangladesh.
authors.forename: M D Munir
authors.initials: MD
authors.lastname: Hossain
authors.affiliation: Institute of Animal Science, Animal Breeding and Husbandry Group, University of Bonn, Bonn, Germany.
authors.forename: Franca
authors.initials: F
authors.lastname: Rings
authors.affiliation: Institute of Animal Science, Animal Breeding and Husbandry Group, University of Bonn, Bonn, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Hoelker
authors.affiliation: Institute of Animal Science, Animal Breeding and Husbandry Group, University of Bonn, Bonn, Germany.
authors.forename: Ernst
authors.initials: E
authors.lastname: Tholen
authors.affiliation: Institute of Animal Science, Animal Breeding and Husbandry Group, University of Bonn, Bonn, Germany.
authors.forename: Christiane
authors.initials: C
authors.lastname: Neuhoff
authors.affiliation: Institute of Animal Science, Animal Breeding and Husbandry Group, University of Bonn, Bonn, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Looft
authors.affiliation: Institute of Animal Science, Animal Breeding and Husbandry Group, University of Bonn, Bonn, Germany.
authors.forename: Karl
authors.initials: K
authors.lastname: Schellander
authors.affiliation: Institute of Animal Science, Animal Breeding and Husbandry Group, University of Bonn, Bonn, Germany.
authors.forename: Dawit
authors.initials: D
authors.lastname: Tesfaye
mesh_terms: D000818:Animals; D002417:Cattle; D016000:Cluster Analysis; D030762:Estrous Cycle / Q000235:genetics*; D005260:Female; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation; D006107:Granulosa Cells / Q000378:metabolism*; D008183:Luteal Phase / Q000235:genetics*; D035683:MicroRNAs / Q000235:genetics*; D006080:Ovarian Follicle / Q000378:metabolism*; D020871:RNA Stability; D015203:Reproducibility of Results; D015398:Signal Transduction; D013997:Time Factors; D059467:Transcriptome
chemical_list: D035683:MicroRNAs