title: Dominant manifestation of pluripotency in embryonic stem cell hybrids with various numbers of somatic chromosomes.
abstract: Developmental potential was assessed in 8 intra-specific and 20 inter-specific hybrid clones obtained by fusion of embryonic stem (ES) cells with either splenocytes or fetal fibroblasts. Number of chromosomes derived from ES cells in these hybrid clones was stable while contribution of somatic partner varied from single chromosomes to complete complement. This allowed us to compare pluripotency of the hybrid cells with various numbers of somatic chromosomes. Three criteria were used for the assessment: (i) expression of Oct-4 and Nanog genes; (ii) analyses of teratomas generated by subcutaneous injections of the tested cells into immunodeficient mice; (iii) contribution of the hybrid cells in chimeras generated by injection of the tested cells into C57BL blastocysts. All tested hybrid clones showed expression of Oct-4 and Nanog at level comparable to ES cells. Histological and immunofluorescent analyses demonstrated that most teratomas formed from the hybrid cells with different number of somatic chromosomes contained derivatives of three embryonic layers. Tested hybrid clones make similar contribution in various tissues of chimeras in spite of significant differences in the number of somatic chromosomes they contained. The data indicate that pluripotency is manifested as a dominant trait in the ES hybrid cells and does not depend substantially on the number of somatic chromosomes. The latter suggests that the developmental potential derived from ES cells is maintained in ES-somatic cell hybrids by cis-manner and is rather resistant to trans-acting factors emitted from the somatic one.
authors.affiliation: Institute of Cytology and Genetics, Academy of Sciences of Russia, Siberian Branch, Novosibirsk, Russia.
authors.forename: Anna A
authors.initials: AA
authors.lastname: Vasilkova
authors.forename: Helen A
authors.initials: HA
authors.lastname: Kizilova
authors.forename: Mikhail V
authors.initials: MV
authors.lastname: Puzakov
authors.forename: Alexander G
authors.initials: AG
authors.lastname: Shilov
authors.forename: Antonina I
authors.initials: AI
authors.lastname: Zhelezova
authors.forename: Alevtina N
authors.initials: AN
authors.lastname: Golubitsa
authors.forename: Nariman R
authors.initials: NR
authors.lastname: Battulin
authors.forename: Vitaly E
authors.initials: VE
authors.lastname: Vedernikov
authors.forename: Alexey G
authors.initials: AG
authors.lastname: Menzorov
authors.forename: Natalia M
authors.initials: NM
authors.lastname: Matveeva
authors.forename: Oleg L
authors.initials: OL
authors.lastname: Serov
mesh_terms: D000818:Animals; D033481:Chromosomes, Mammalian; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism; D053595:Embryonic Stem Cells / Q000166:cytology / Q000502:physiology*; D018398:Homeodomain Proteins / Q000235:genetics / Q000378:metabolism; D006822:Hybrid Cells / Q000166:cytology / Q000502:physiology*; D007621:Karyotyping; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D008819:Mice, Nude; D000071317:Nanog Homeobox Protein; D050814:Octamer Transcription Factor-3 / Q000235:genetics / Q000378:metabolism; D039904:Pluripotent Stem Cells / Q000166:cytology / Q000502:physiology*; D013724:Teratoma / Q000378:metabolism / Q000473:pathology; D014018:Tissue Distribution
chemical_list: D004268:DNA-Binding Proteins; D018398:Homeodomain Proteins; D000071317:Nanog Homeobox Protein; C475540:Nanog protein, mouse; D050814:Octamer Transcription Factor-3