The major goal is to understand the fundamental mechanisms for cellular commitment to mortality. We concentrate on the critical distinction between immortal early embryonic cells and mortal differentiating derivative cells. Our approach is to optimize the use of systematic genomic approaches for profiling gene expression patterns by large-scale cDNA sequencing and cDNA microarray technology with a current cohort of ~22,000 genes collected from early mouse embryos and stem cells. We are particularly focusing on two closely related experimental systems. (1) Preimplantation development - the process of fertilized egg gradually losing its totipotency. In our previous work, we identified many genes that show stage-specific expression patterns during preimplantation mouse development. However, these genes have been identified by EST frequency, which is a relatively inaccurate and far from ideal way to do gene expression profiling. The cDNA microarray-based gene expression profiling will provide more reliable information. To this end, we have been working on large-scale gene expression profiling of each stage of preimplantation mouse development. To start to examine whether these genes identified here might be involved in the immortal/mortal transition process, we are currently analyzing the nature of these genes in greater detail. We are also testing various antisense oligonucleotides and siRNA to inhibit the function of specific gene in preimplantation mouse embryos. (2) Differentiation of the urogenital system: Germ line cells are often viewed as immortal, because they provide continuity from generation to generation and do not seem to age. To begin the analysis of gene expression regulation involved in germ line-somatic cell interactions, we conducted gene expression profiling by sequencing cell type-specific cDNA libraries that include E13.5 male and female primordial germ cells as well as two stages in the kidney-urogenital developmental axis, E12.5 female gonad/mesonephros and newborn ovary. We are currently analyzing genes differentially expressed in these cells, tissues, and organs more in detail.

Agency
National Institute of Health (NIH)
Institute
National Institute on Aging (NIA)
Type
Intramural Research (Z01)
Project #
1Z01AG000655-04
Application #
6668112
Study Section
(LG)
Project Start
Project End
Budget Start
Budget End
Support Year
4
Fiscal Year
2002
Total Cost
Indirect Cost
Name
Aging
Department
Type
DUNS #
City
State
Country
United States
Zip Code
Vallejo, Griselda; Maschi, DarĂ­o; Mestre-Citrinovitz, Ana C et al. (2010) Changes in global gene expression during in vitro decidualization of rat endometrial stromal cells. J Cell Physiol 222:127-37
Vallee, Maud; Aiba, Kazuhiro; Piao, Yulan et al. (2008) Comparative analysis of oocyte transcript profiles reveals a high degree of conservation among species. Reproduction 135:439-48
Falco, Geppino; Lee, Sung-Lim; Stanghellini, Ilaria et al. (2007) Zscan4: a novel gene expressed exclusively in late 2-cell embryos and embryonic stem cells. Dev Biol 307:539-50
Rogers, N T; Halet, G; Piao, Y et al. (2006) The absence of a Ca(2+) signal during mouse egg activation can affect parthenogenetic preimplantation development, gene expression patterns, and blastocyst quality. Reproduction 132:45-57
Falco, Geppino; Stanghellini, Ilaria; Ko, Minoru S H (2006) Use of Chuk as an internal standard suitable for quantitative RT-PCR in mouse preimplantation embryos. Reprod Biomed Online 13:394-403
Park, Jung-Min; Kohn, Matthew J; Bruinsma, Monique W et al. (2006) The multifunctional RNA-binding protein La is required for mouse development and for the establishment of embryonic stem cells. Mol Cell Biol 26:1445-51
Yoshikawa, Toshiyuki; Piao, Yulan; Zhong, Jinhui et al. (2006) High-throughput screen for genes predominantly expressed in the ICM of mouse blastocysts by whole mount in situ hybridization. Gene Expr Patterns 6:213-24
Ko, Minoru S H (2006) Expression profiling of the mouse early embryo: reflections and perspectives. Dev Dyn 235:2437-48
Hamatani, Toshio; Ko, Minoru Sh; Yamada, Mitsutoshi et al. (2006) Global gene expression profiling of preimplantation embryos. Hum Cell 19:98-117
Ko, Minoru S H (2005) Molecular biology of preimplantation embryos: primer for philosophical discussions. Reprod Biomed Online 10 Suppl 1:80-7

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