Intracellular symbionts and the evolution of uniparental cytoplasmic inheritance

@article{Law1992IntracellularSA,
  title={Intracellular symbionts and the evolution of uniparental cytoplasmic inheritance},
  author={Richard Law and Vivian Hutson},
  journal={Proceedings of the Royal Society of London. Series B: Biological Sciences},
  year={1992},
  volume={248},
  pages={69 - 77}
}
  • R. Law, V. Hutson
  • Published 22 April 1992
  • Biology, Medicine
  • Proceedings of the Royal Society of London. Series B: Biological Sciences
Uniparental inheritance of cytoplasmic elements is widespread among eukaryotic organisms and is achieved by a diverse range of mechanisms. This paper shows that the cytoplasmic genetic system would be expected to evolve towards uniparental inheritance, given the existence of deleterious symbionts capable of invading the host cytoplasm together with nuclear genes that lead to the elimination of cytoplasmic elements from one of the gamete types. The reason for this is that, under biparental… 
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This thesis proposes two alternative hypotheses for the evolution of uniparental inheritance: (1) avoidance of costly mixing of different cytoplasmic genomes within hosts; and (2) selection for the accumulation of beneficial cytop lasmic mutations within hosts.
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  • 1993
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It is argued that this is a feasible mechanism for the origin of two sexes because a double dose of symbionts is more deleterious than a single dose, and zygotes lacking cytoplasm from both gametes are inviable.
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It is shown that despite an empirically demonstrated association between anisogamy and multicellularity, this result also applies if the analysis is applied in the multi-cellular case, and that the model presented is far from robust.
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A computational model is used to show that the unique biology of cytoplasmic genomes—specifically their organization into host cells and their uniparental (maternal) inheritance—enable them to undergo effective adaptive evolution.
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The analysis described here predicts a large, rapid reduction in fitness associated with isogamous sexual reproduction, due to the spread of deleterious cytoplasmic agents with fitness only subsequently rising to a maximum twofold cost as uniparental inheritance of cy toplasm and anisogamy evolve.
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    Philosophical transactions of the Royal Society of London. Series B, Biological sciences
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TLDR
It is proposed that the development of such techniques may result in powerful new methods of population control which may be applied to both agricultural pests and disease vectors.
Host–symbiont conflict over the mixing of symbiotic lineages
  • S. Frank
  • Biology, Medicine
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  • 1996
TLDR
A comparison of differing symbiont life histories leads to a careful analysis of the conditions under which hosts are favoured to control mixing of their symbionts, expanding the scope beyond cytoplasmic inheritance and genomic conflict.
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