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Article Dans Une Revue Molecular Reproduction and Development Année : 2006

Architectural reorganization of the nuclei upon transfer into oocytes accompanies genome reprogramming

Résumé

The ability of cloned embryos to sustain full-term development depends on the ability of the recipient ooplasm to reprogram the donor cell genome. As the nuclear architecture has recently emerged as a key-factor in the regulation of gene expression, we questioned whether early embryos obtained from transfer of ES metaphasic chromosomes into mouse ooplasm would adopt the somatic or embryonic type of nuclear organization. We have particularly focused on the arrangement of chromosomal territories with respect to the nucleolar compartment, and the pericentric heterochromatin domains called chromocenters. We found that nuclear transfer triggers profound chromatin rearrangements including the dispersion of the donor cell chromocenters components. These rearrangements lead to a typical 1-cell pronuclear organization, namely a radial arrangement of the chromosome territories with centromeres attached to the nucleoli, which adopt the compact fibrillar structure of nucleolar precursor bodies (NPBs). Subsequently, during the second cycle, the cloned embryos undergo further reorganization with the establishment of new chromocenters, clustered in one part of the nucleus, as during normal embryogenesis. We could also establish that the adequate distribution of chromosomal territories at the pronuclear stage seems important for the development until blastocyst.

Dates et versions

hal-02610674 , version 1 (17-05-2020)

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Catherine Martin, Vincent V. Brochard, Carole Migné, Daniele Zink, Pascale Debey, et al.. Architectural reorganization of the nuclei upon transfer into oocytes accompanies genome reprogramming. Molecular Reproduction and Development, 2006, 73 (9), pp.1102-1111. ⟨10.1002/mrd.20506⟩. ⟨hal-02610674⟩
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