Pandey K, Mizukami Y, Watanabe K, Sakaguti S, Kadokawa H. Deep sequencing of the transcriptome in the anterior pituitary of heifers before and after ovulation.
J Vet Med Sci 2017;
79:1003-1012. [PMID:
28442638 PMCID:
PMC5487774 DOI:
10.1292/jvms.16-0531]
[Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
We aimed to determine gene expression patterns in the anterior pituitary (AP) of heifers
before and after ovulation via deep sequencing of the transcriptome (RNA-seq) to identify
new genes and clarify important pathways. Heifers were slaughtered on the estrus day
(pre-ovulation; n=5) or 3 days after ovulation (post-ovulation; n=5) for AP collection. We
randomly selected 4 pre-ovulation and 4 post-ovulation APs, and the ribosomal RNA-depleted
poly (A)+RNA were prepared to assemble next-generation sequencing libraries. The bovine
APs expressed 12,769 annotated genes at pre- or post-ovulation. The sum of the reads per
kilobase of exon model per million mapped reads (RPKM) values of all transcriptomes were
599,676 ± 38,913 and 668,209 ± 23,690, and 32.2 ± 2.6% and 44.0 ± 4.4% of these
corresponded to the AP hormones in the APs of pre- and post-ovulation heifers,
respectively. The bovine AP showed differential expression of 396 genes
(P<0.05) in the pre- and post-ovulation APs. The 396 genes included
two G-protein-coupled receptor (GPCR) genes (GPR61 and
GPR153) and those encoding 13 binding proteins. The AP also expressed
259 receptor and other 364 binding proteins. Moreover, ingenuity pathway analysis for the
396 genes revealed (P=2.4 × 10−3) a canonical pathway linking
GPCR to cytoskeleton reorganization, actin polymerization, microtubule growth, and gene
expression. Thus, the present study clarified the novel genes found to be differentially
expressed before and after ovulation and clarified an important pathway in the AP.
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