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Bożyk K, Gilecka K, Humięcka M, Szpila M, Suwińska A, Tarkowski AK. Mouse↔rat aggregation chimaeras can develop to adulthood. Dev Biol 2017; 427:106-120. [PMID: 28499799 DOI: 10.1016/j.ydbio.2017.05.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2017] [Revised: 04/13/2017] [Accepted: 05/07/2017] [Indexed: 01/12/2023]
Abstract
In order to examine interactions between cells originating from different species during embryonic development we constructed interspecific mouse↔rat chimaeras by aggregation of 8-cell embryos. Embryos of both species expressed different fluorescent markers (eGFP and DsRed), which enabled us to follow the fate of both components from the moment of aggregation until adulthood. We revealed that in majority of embryos the blastocyst cavity appeared inside the group of rat cells, while the mouse component was allocated to the deeper layer of the inner cell mass and to the polar trophectoderm. However, due to rearrangement of all cells and selective elimination of rat cells, shortly before implantation all primary lineages became chimaeric. Moreover, despite the fact that rat cells were always present in the mural trophectoderm, majority of mouse↔rat chimaeric blastocysts implanted in mouse uterus, and out of those 46% developed into foetuses and pups, half of which were chimaeric. In contrast to mural trophectoderm, polar trophectoderm derivatives, i.e. the placentae of all chimaeras were exclusively of mouse origin. This strongly suggests that the successful postimplantation development of chimaeras is enabled by gradual elimination of xenogeneic cells from the nascent placenta. The size of chimaeric newborns was within the limits of control mouse neonates. The rat component located preferentially in the anterior part of the body, where it contributed mainly to the neural tube. Our observations indicate that although chimaeric animals were able to reach adulthood, high contribution of rat cells tended to diminish their viability.
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Affiliation(s)
- Katarzyna Bożyk
- Department of Embryology, Institute of Zoology, Faculty of Biology, University of Warsaw, Miecznikowa 1, 02-096 Warsaw, Poland
| | - Katarzyna Gilecka
- Department of Embryology, Institute of Zoology, Faculty of Biology, University of Warsaw, Miecznikowa 1, 02-096 Warsaw, Poland
| | - Monika Humięcka
- Department of Embryology, Institute of Zoology, Faculty of Biology, University of Warsaw, Miecznikowa 1, 02-096 Warsaw, Poland
| | - Marcin Szpila
- Department of Embryology, Institute of Zoology, Faculty of Biology, University of Warsaw, Miecznikowa 1, 02-096 Warsaw, Poland
| | - Aneta Suwińska
- Department of Embryology, Institute of Zoology, Faculty of Biology, University of Warsaw, Miecznikowa 1, 02-096 Warsaw, Poland.
| | - Andrzej K Tarkowski
- Department of Embryology, Institute of Zoology, Faculty of Biology, University of Warsaw, Miecznikowa 1, 02-096 Warsaw, Poland
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