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Bovine embryos contain a higher proportion of polyploid cells in the trophectoderm than in the embryonic disc
Author(s) -
Viuff Dorthe,
Palsgaard Anne,
Rickords Lee,
Lawson Lartey G.,
Greve Torben,
Schmidt Mette,
Avery Birthe,
Hyttel Poul,
Thomsen Preben D.
Publication year - 2002
Publication title -
molecular reproduction and development
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.745
H-Index - 105
eISSN - 1098-2795
pISSN - 1040-452X
DOI - 10.1002/mrd.90004
Subject(s) - polyploid , biology , embryo , embryonic stem cell , andrology , genetics , microbiology and biotechnology , inner cell mass , ploidy , embryogenesis , blastocyst , gene , medicine
Abstract The frequency of polyploid cells in the embryonic disc (ED) and in the trophectoderm (TE) was assessed in 50 in vitro produced bovine embryos fixed at days 7–8 post insemination (pi) and in 20 in vitro produced embryos that were transferred to uteri of recipients at day 7 and then recovered and fixed at day 12 pi. Separation of TE and ED cells was obtained by microdissection and the frequency of polyploid cells was determined by interphase cytogenetic analysis using fluorescence in situ hybridization (FISH) with chromosome 6‐ and chromosome 7‐specific probes. The results show that 96% of day 7 embryos contain polyploid cells in the TE, whereas only 58% contain polyploid cells in the ED. In day 12 embryos 85% of TE and 40% of ED preparations contain polyploid cells. Statistical analysis revealed that the frequency of polyploid cells was significantly higher in the TE than in the ED in embryos containing less than 25% polyploid cells (n = 65). The few embryos (n = 5), which contained more than 25% polyploid cells, did not show this difference. Further, it was revealed that the level of polyploidy on day 7–8 was significantly higher than on day 12, both in the TE (two‐fold) and in the ED (seven‐fold). Mol. Reprod. Dev. 62:483–488, 2002. © 2002 Wiley‐Liss, Inc.