Altered Nuclear Transfer

    Project: Research project

    Description

    DESCRIPTION (provided by applicant): The aim of this project is to generate important new insights concerning epigenetic factors in oocytes governing reprogramming following somatic cell nuclear transfer (SCNT) and formation and maintenance of the first two lineages in mammalian embryos, the inner cell mass (ICM) and trophectoderm (TE). Our main hypothesis is that experimental modulation of expression levels for the key transcription factors in oocytes will prevent formation of the TE while enhancing the production of the ICM lineage. These alterations should preclude the formation of an embryo while promoting and enhancing donor nucleus reprogramming required for the formation of a single lineage from which pluripotent stem cell lines can be established. We propose the following specific aims: Aim 1. Establish a mouse model of ANT with improved ESC derivation. Initially, we will investigate the effect of siRNA-mediated knockdown of Cdx2, Tead4, and E-Cadherin in mouse oocytes on reprogramming of somatic cells after SCNT. Next, we will examine a cumulative impact of the TE inactivation along with upregulation of critical pluripotent factors - Oct4, Sox2, and Nanog - on reprogramming and derivation of ESCs. Aim 2. Define factors in monkey oocytes that are crucial for TE development. In Experiment 1, we will examine the presence and expression profiles of TEAD4 in monkey oocytes and preimplantation embryos. Next, we will study the role of TEAD4 in monkey oocytes and embryos by morpholino-assisted knockdown. Lastly, fertilized TEAD4-deficient oocytes will be used for ESC isolation. Aim 3: Analyze the roles of key maternal TE factors in epigenetic reprogramming after monkey SCNT. In this aim, we will apply most promising approaches to assess the validity of ANT in the monkey model by first creating CDX2 and TEAD4 depleted oocytes and then conducting SCNT and subsequently deriving ESCs from the resultant pluripotent cells. 1 PUBLIC HEALTH RELEVANCE: In this application we will study the potential of autologous (patient-matched) stem cells derived by somatic cell nuclear transfer in the nonhuman primate model while avoiding the destruction of viable embryos. The outcomes of these experiments, in turn, will allow the production of useful preclinical monkey models for testing therapeutic applications involving autologous stem cells for the treatment of wide range of degenerative diseases.
    StatusFinished
    Effective start/end date2/1/101/31/16

    Funding

    • National Institutes of Health: $529,101.00
    • National Institutes of Health: $555,888.00
    • National Institutes of Health: $532,361.00
    • National Institutes of Health: $538,118.00
    • National Institutes of Health: $543,589.00

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    Oocytes
    Haplorhini
    Epigenomics
    Embryonic Structures
    Mammalian Embryo
    Morpholinos
    Pluripotent Stem Cells
    Blastocyst
    Cell Lineage
    Cadherins
    Small Interfering RNA
    Transcription Factors
    Up-Regulation
    Maintenance
    Mothers
    Cell Line
    Adult Stem Cells
    Primates

    ASJC

    • Medicine(all)