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Abstract:

The transition from unicellular, to colonial, to larger multicellular organisms has benefits, costs, and requirements. Here we present a model inspired by the volvocine green algae that explains the dynamics involved in the unicellular-multicellular transition using life-history theory and allometry. We model the two fitness components (fecundity and viability) and compare the fitness of hypothetical colonies of different sizes with varying degrees of cellular differentiation to understand the general principles that underlie the evolution of multicellularity. We argue that germ-soma separation may have evolved to counteract the increasing costs and requirements of larger multicellular colonies. The model shows that the cost of investing in soma decreases with size. For lineages such as the Volvocales, as reproduction costs increase with size for undifferentiated colonies, soma specialization benefits the colony indirectly by decreasing such costs and directly by helping reproductive cells acquire resources for their metabolic needs. Germ specialization is favored once soma evolves and takes care of vegetative functions. To illustrate the model, we use some allometric relationships measured in Volvocales. Our analysis shows that the cost of reproducing an increasingly larger group has likely played an important role in the transition to multicellularity and cellular differentiation. © 2013 by The University of Chicago. 0003-0147/2013/18103-54025$15.00. All rights reserved.

Registro:

Documento: Artículo
Título:A general allometric and life-history model for cellular differentiation in the transition to multicellularity
Autor:Solari, C.A.; Kessler, J.O.; Goldstein, R.E.
Filiación:Laboratorio de Biología Comparada de Protistas, Departamento de Biodiversidad y Biología Experimental, Universidad de Buenos Aires, Buenos Aires C1428EHA, Argentina
Department of Physics, University of Arizona, Tucson AZ 85721, Argentina
Department of Applied Mathematics and Theoretical Physics, Centre for Mathematical Sciences, University of Cambridge, Wilberforce Road, Cambridge CB30WA, United Kingdom
Palabras clave:Body size; Cost of reproduction; Germ-soma differentiation; Life-history evolution; Multicellularity; Volvocales; allometry; cell organelle; colony; cost-benefit analysis; fecundity; green alga; life history theory; reproductive cost; specialization; viability; article; biological model; body size; cell differentiation; cytology; evolution; fertility; genetics; germ cell; green alga; growth, development and aging; physiology; reproduction; reproductive fitness; Biological Evolution; Body Size; Cell Differentiation; Chlorophyta; Fertility; Genetic Fitness; Germ Cells; Models, Biological; Reproduction
Año:2013
Volumen:181
Número:3
Página de inicio:369
Página de fin:380
DOI: http://dx.doi.org/10.1086/669151
Título revista:American Naturalist
Título revista abreviado:Am. Nat.
ISSN:00030147
CODEN:AMNTA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00030147_v181_n3_p369_Solari

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Citas:

---------- APA ----------
Solari, C.A., Kessler, J.O. & Goldstein, R.E. (2013) . A general allometric and life-history model for cellular differentiation in the transition to multicellularity. American Naturalist, 181(3), 369-380.
http://dx.doi.org/10.1086/669151
---------- CHICAGO ----------
Solari, C.A., Kessler, J.O., Goldstein, R.E. "A general allometric and life-history model for cellular differentiation in the transition to multicellularity" . American Naturalist 181, no. 3 (2013) : 369-380.
http://dx.doi.org/10.1086/669151
---------- MLA ----------
Solari, C.A., Kessler, J.O., Goldstein, R.E. "A general allometric and life-history model for cellular differentiation in the transition to multicellularity" . American Naturalist, vol. 181, no. 3, 2013, pp. 369-380.
http://dx.doi.org/10.1086/669151
---------- VANCOUVER ----------
Solari, C.A., Kessler, J.O., Goldstein, R.E. A general allometric and life-history model for cellular differentiation in the transition to multicellularity. Am. Nat. 2013;181(3):369-380.
http://dx.doi.org/10.1086/669151