title: [Epigenetic inactivation of the RB1 gene as a factor of genomic instability: a possible contribution to etiology of chromosomal mosaicism during human embryo development].
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 genetic 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.
authors.forename: E N
authors.initials: EN
authors.lastname: Tolmacheva
authors.forename: A A
authors.initials: AA
authors.lastname: Kashevarova
authors.forename: N N
authors.initials: NN
authors.lastname: Sukhanova
authors.forename: E A
authors.initials: EA
authors.lastname: Sazhenova
authors.forename: I N
authors.initials: IN
authors.lastname: Lebedev
mesh_terms: D000022:Abortion, Spontaneous / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D000328:Adult; D000782:Aneuploidy; D019175:DNA Methylation / Q000235:genetics*; D047108:Embryonic Development / Q000235:genetics*; D005260:Female; D020868:Gene Silencing; D042822:Genomic Instability / Q000235:genetics*; D006801:Humans; D009030:Mosaicism / Q000196:embryology*; D011247:Pregnancy; D011401:Promoter Regions, Genetic / Q000235:genetics*; D016160:Retinoblastoma Protein / Q000235:genetics* / Q000378:metabolism
chemical_list: D016160:Retinoblastoma Protein