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Epigenetic inactivation of the RB1 gene as a factor of genomic instability: A possible contribution to etiology of chromosomal mosaicism during human embryo development

  • Molecular Genetics
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Abstract

The methylation status of the cell cycle control gene RB1 has been studied in placental tissues of spontaneous abortions of the first trimester of pregnancy with mosaic variants of numerical chromosomal abnormalities verified by a molecular cytogenetic examination. Aberrant methylation of the gene promoter region has been revealed for the first time in 20% of embryos with chromosomal mosaicism that died in utero. A maximum frequency of epimutations was recorded in a group of embryos with a low level of abnormal cells for which mitotic errors are most likely to determine the formation of mosaic aneuploidy in primary euploid zygotes. It has been suggested that aberrant epigenetic genomic modifications at early stages of human embryonic development can be one of the mechanisms promoting genomic instability realized in the form of mosaic abnormalities of the karyotype that are incompatible with the normal course of embryogenesis.

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Authors and Affiliations

  1. Research Institute of Medical Genetics, Tomsk Research Center, Russian Academy of Medical Sciences, Tomsk, 634050, Russia

    E. N. Tolmacheva, A. A. Kashevarova, N. N. Sukhanova, E. A. Sazhenova & I. N. Lebedev

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  1. E. N. Tolmacheva
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  2. A. A. Kashevarova
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  3. N. N. Sukhanova
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  4. E. A. Sazhenova
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  5. I. N. Lebedev
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Correspondence to E. N. Tolmacheva.

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Original Russian Text © E.N. Tolmacheva, A.A. Kashevarova, N.N. Sukhanova, E.A. Sazhenova, I.N. Lebedev, 2008, published in Genetika, 2008, Vol. 44, No. 11, pp. 1461–1467.

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Tolmacheva, E.N., Kashevarova, A.A., Sukhanova, N.N. et al. Epigenetic inactivation of the RB1 gene as a factor of genomic instability: A possible contribution to etiology of chromosomal mosaicism during human embryo development. Russ J Genet 44, 1266–1271 (2008). https://doi.org/10.1134/S1022795408110033

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  • DOI: https://doi.org/10.1134/S1022795408110033

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