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| Format: | Artículo científico |
| Language: | en |
| Published: |
Universidad Nacional de Colombia
2007
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| Online Access: | https://www.redalyc.org/articulo.oa?id=319028602002 |
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Table of Contents:
- DYNAMICS OF SOMATIC CELL-LINEAGE COMPETITION IN CHIMERAS OF Hydractinia symbiolongicarpus (CNIDARIA: HYDROZOA) RYAN S. SCHWARZ LUIS F. CADAVID Biología of cell units chimera selection Sessile colonial invertebrates often fuse with conspecifics to form chimeras. Chimerism represents an unequivocal instance of within-individual selection where genetically different cell-lineages compete for representation in the somatic and gametic pools. We analyzed temporal and spatial variations in somatic cell-lineage composition of laboratory-established chimeras of the hydroid Hydractinia symbiolongicarpus (Cnidaria: Hydrozoa). Using three clones with different allotypic specificities (i.e., two rejecting one another but fusing with a third one), we established two classes of two-way chimeras, a single three-way chimera class, and an incompatible interaction as control. Chimeras were sampled at five time intervals for a year. Cell-lineages in samples were identified by polyp fusibility assays against tester colonies of known fusibility. The cell lineages composing the chimeras showed a differential competitive ability, with one of them representing close to 80% by the end of the study. Rare cell-lineages stabilized at low frequencies but preserved their ability to gain somatic representation and to colonize distant parts of the chimera. This behavior characterizes cell parasites. As a consequence of the reproductive plasticity of most colonial invertebrates, cell-lineage variability may be transmitted to the offspring both sexually and asexually. Successful somatic com- petitors are expected to be preferentially transmitted asexually, whereas cell parasites would be preferentially transmitted sexually. 2007 artículo científico 0120-548X https://www.redalyc.org/articulo.oa?id=319028602002 en http://www.redalyc.org/revista.oa?id=3190 Acta Biológica Colombiana application/pdf Universidad Nacional de Colombia Acta Biológica Colombiana (Colombia) Vol.12