Life-history evolution and the origin of multicellularity

Michod, Richard E.; Viossat, Yannick; Solari, Cristian A.; Hurand, Mathilde; Nedelcu, Aurora M.

doi:10.1016/j.jtbi.2005.08.043

Cited by 120 publications

(221 citation statements)

References 43 publications

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“…The construction of Fig. 3D illustrates qualitatively a prediction of our model (10,11), which is that the greater the cost of reproduction (e N ), the more likely the isocline touches the tradeoff curve at v max (meaning the new cell will be somaspecialized; b ϭ 0) as opposed to touching at an intermediate value 0 Ͻ b Ͻ b max . Soma-specialized cells get a bonus to viability by virtue of their not paying the cost of reproduction indicated in Fig.…”

Section: Cost Of Reproductionmentioning

confidence: 67%

“…We have modeled the hypothesis that life-history tradeoffs drive evolutionary transitions in individuality by selecting for cell specialization by considering how cells should change their allocation to reproduction and viability as colony size increases (10,11). Our theoretical results predict that in unicellular organisms the tradeoff curve between viability and fecundity should be concave, but as groups form and increase in size the curve should become increasingly convex (Fig.…”

Section: Cost Of Reproductionmentioning

confidence: 99%

“…Tradeoffs among the contributions of cells to the fitness components of the group leads to the ''covariance effect,'' whereby the fitness of the group, W, is greater than the average fitness of its members, w, by the magnitude of the covariance among fitness components (10,11) as given in Eq. 1.…”

Section: Covariance Effectmentioning

confidence: 99%

“…Our hypothesis is that fitness tradeoffs drive the transition of a cell group into a multicellular individual through the evolution of cells specialized at reproductive and vegetative functions of the group. We have modeled this hypothesis (10)(11)(12) and have tested our models in two ways. We first ask whether a life-history gene present in the unicellular ancestor was coopted to be an altruistic gene in the multicellular Volvox carteri (Fig.…”

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confidence: 99%

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Evolution of individuality during the transition from unicellular to multicellular life

Michod

2007

Proc. Natl. Acad. Sci. U.S.A.

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Individuality is a complex trait, yet a series of stages each advantageous in itself can be shown to exist allowing evolution to get from unicellular individuals to multicellular individuals. We consider several of the key stages involved in this transition: the initial advantage of group formation, the origin of reproductive altruism within the group, and the further specialization of cell types as groups increase in size. How do groups become individuals? This is the central question we address. Our hypothesis is that fitness tradeoffs drive the transition of a cell group into a multicellular individual through the evolution of cells specialized at reproductive and vegetative functions of the group. We have modeled this hypothesis and have tested our models in two ways. We have studied the origin of the genetic basis for reproductive altruism (somatic cells specialized at vegetative functions) in the multicellular Volvox carteri by showing how an altruistic gene may have originated through cooption of a life-history tradeoff gene present in a unicellular ancestor. Second, we ask why reproductive altruism and individuality arise only in the larger members of the volvocine group (recognizing that high levels of kinship are present in all volvocine algae groups). Our answer is that the selective pressures leading to reproductive altruism stem from the increasing cost of reproduction with increasing group size. Concepts from population genetics and evolutionary biology appear to be sufficient to explain complexity, at least as it relates to the problem of the major transitions between the different kinds of evolutionary individuals.evolutionary transitions ͉ multicellularity ͉ Volvox

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Section: Cost Of Reproductionmentioning

confidence: 67%

Section: Cost Of Reproductionmentioning

confidence: 99%

Section: Covariance Effectmentioning

confidence: 99%

mentioning

confidence: 99%

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Evolution of individuality during the transition from unicellular to multicellular life

Michod

2007

Proc. Natl. Acad. Sci. U.S.A.

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273

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“…Spontaneous adsorption of cells onto spherical template surfaces is speculated to be triggered by some type of specific interaction, hence establishing intercellular connections. 3,4 The process of cell assembly is the basis on which multicellular organisms are built, 3,5 and it is in the course of the assembly of cells and tissues, that an organism acquires its final shape and functionality. Functionality of complex biological structures is determined by specific intercellular and cell-extracellular matrix interactions.…”

Section: Introductionmentioning

confidence: 99%

Uniform yeast cell assembly via microfluidics

Chang

Marquez

et al. 2012

Biomicrofluidics

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This paper reports the use of microfluidic approaches for the fabrication of yeastosomes (yeast-celloidosomes) based on self-assembly of yeast cells onto liquid-solid or liquid-gas interfaces. Precise control over fluidic flows in droplet- and bubble-forming microfluidic devices allows production of monodispersed, size-selected templates. The general strategy to organize and assemble living cells is to tune electrostatic attractions between the template (gel or gas core) and the cells via surface charging. Layer-by-Layer (LbL) polyelectrolyte deposition was employed to invert or enhance charges of solid surfaces. We demonstrated the ability to produce high-quality, monolayer-shelled yeastosome structures under proper conditions when sufficient electrostatic driving forces are present. The combination of microfluidic fabrication with cell self-assembly enables a versatile platform for designing synthetic hierarchy bio-structures.

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Evolution of Multicellularity

Nedelcu

2012

Encyclopedia of Life Sciences

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Multicellularity has evolved multiple times, independently, in lineages from all three domains of life. The transition from a unicellular to a multicellular life‐style entails the integration of previously independent individuals into a new kind of individual. The emergence of individuality at the higher level requires the evolution of cooperative and altruistic behaviours, division of labour (including the separation of reproductive and somatic activities among cells), the reorganisation of basic life properties (such as immortality and totipotency), and the reorganisation of fitness (with cells specialising in one or the other fitness components – survival or reproduction). At a more mechanistic level, a new genotype–phenotype map has to be created to reflect the emergence of a new kind of individual. Notably, many traits associated with multicellularity appear to have involved the co‐option of genes and pathways already present in unicellular lineages. The evolution of multicellularity has been driven by a combination of selective pressures, developmental constraints and life history trade‐offs specific to each lineage. Key Concepts: The transition from a unicellular to a multicellular life‐style constitutes a transition in individuality, a process whereby a group of previously independent individuals become stably integrated into a new functional, physiological and reproductively autonomous and indivisible evolutionary unit – that is, a new individual. The successful integration of previously independent individuals into a new kind of individual requires the evolution of cooperative and altruistic behaviours, division of labour, the reorganisation of basic life properties, and the reorganisation of fitness. Multicellularity has evolved independently in at least 25 lineages from all three domains of life. The evolution of multicellularity has been driven by a combination of selective pressures, developmental constraints and life history trade‐offs specific to each lineage. Many traits associated with multicellularity involved the co‐option of genes and pathways already present in unicellular lineages.

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Life-history evolution and the origin of multicellularity

Cited by 120 publications

References 43 publications

Evolution of individuality during the transition from unicellular to multicellular life

Evolution of individuality during the transition from unicellular to multicellular life

Uniform yeast cell assembly via microfluidics

Evolution of Multicellularity

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