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Series GSE7309 Query DataSets for GSE7309
Status Public on Jun 04, 2007
Title Requirement for ERK MAP kinase in mouse preimplantation development
Organism Mus musculus
Experiment type Expression profiling by array
Summary Preimplantation development is a crucial step for successful implantation and pregnancy. Although both compaction and blastocyst formation have been extensively studied, mechanisms regulating early cell division stages before compaction have remained unclear. Here, we show that ERK MAP kinase function is required for early embryonic cell division and normal cell-cell adhesion before compaction. Our analysis demonstrates that inhibition of ERK activation in the late 2-cell stage embryos leads to a reversible arrest in G2 phase in the 4-cell stage. The G2 arrested, 4-cell stage embryos show weakened cell-cell adhesion as compared to control embryos. Remarkably, microarray analyses show that most of the programmed changes of upregulated and downregulated gene expression during the 4- to 8-cell stages normally proceed in the 4-cell stage-arrested embryos, except for a portion of the genes whose expression profiles closely parallel the stages of embryonic development when arrested in G2 and released to resume development. These parallel genes include the genes encoding intercellular adhesion molecules, whose expression is found to be positively regulated by the ERK pathway. We also show that while ERK inactivation in the 8-cell stage embryos does not lead to cell division arrest, it does cause cell division arrest when cadherin-mediated cell-cell adhesion is disrupted. These results demonstrate an essential role of ERK function in the G2/M transition and the expression of adhesion molecules during the 2-cell to 8-cell stage embryos, and suggest a loose parallelism between the gene expression programs and the developmental stages before compaction.
Keywords: preimplantation development
 
Overall design We examined expression profiles of genes during early cell division stages in mouse preimplantation development. We performed the genome-wide analysis by using Affymetrix GeneChip oligonucleotide microarrays, and examined the effect of the ERK pathway inhibitor U0126 on the expression profiles. Two independent experiments were carried out. We collected embryos at six points as follows; control embryos at day 1.5 (cont. 1.5, 2-cell stage), day 2.5 (cont. 2.5, 4- to 8-cell), and day 3.5 (cont. 3.5, morula to blastocyst), and the U0126-treated embryos at day 2.5 (U2.5, 4-cell arrested), embryos released from the U0126-induced arrest at day 3.5 (U3.5, 8-cell) and at day 4.5 (U4.5, morula to blastocyst). Hybridization was carried out with the Mouse Genome 430 2.0 array following Affymetrix instructions. Hybridized arrays were scanned using an Affymetrix GeneChip Scanner. Expression analysis was performed using GeneChip Operating Software v. 1.2 (GCOS) and GeneSpring 7.3.
 
Contributor(s) Maekawa M, Yamamoto T, Nishida E
Citation(s) 17611221
Submission date Mar 19, 2007
Last update date Feb 11, 2019
Contact name Eisuke Nishida
E-mail(s) nishida@lif.kyoto-u.ac.jp
Phone +81-75-753-4230
Organization name Graduate School of Biostudies, Kyoto University
Department Department of Cell and Developmental Biology
Street address Kitashirakawa, Sakyo-ku
City Kyoto
ZIP/Postal code 606-8502
Country Japan
 
Platforms (1)
GPL1261 [Mouse430_2] Affymetrix Mouse Genome 430 2.0 Array
Samples (12)
GSM176483 embryo_at_day1.5_rep1
GSM176484 embryo_at_day1.5_rep2
GSM176485 embryo_at_day2.5_rep1
Relations
BioProject PRJNA98085

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Supplementary file Size Download File type/resource
GSE7309_RAW.tar 39.5 Mb (http)(custom) TAR (of CEL)
Raw data provided as supplementary file

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