Powered by OpenAIRE graph
Found an issue? Give us feedback
image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao BioEssaysarrow_drop_down
image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
BioEssays
Article . 2011 . Peer-reviewed
License: Wiley Online Library User Agreement
Data sources: Crossref
BioEssays
Article . 2012
versions View all 2 versions
addClaim

This Research product is the result of merged Research products in OpenAIRE.

You have already added 0 works in your ORCID record related to the merged Research product.

Sex or no sex, reproduction is not the question

Authors: David Lesbarrères;

Sex or no sex, reproduction is not the question

Abstract

Thirty years after Margulis [1] proposed her theory on endosymbiosis and almost a century since Fisher’s work [2] laid the ground for the modern theory of evolution, the question surrounding the evolutionary benefit of sex is still sparking great interest [3]. Several theories have been proposed to explain the maintenance of different reproductive strategies, be it sexual or one of the different forms of asexual reproduction. However, the different challenges and costs of the former still constitute a puzzling evolutionary issue to this day [4]. In an ever changing environment, one always argues that sexual reproduction generates beneficial diversity through allelic recombination, whereas reproduction of parthenogenetic species only leads to similar genomes being spread among descendants. From a purely cost-benefit and numerical perspective however, the exponential growth of an asexual population greatly outcompetes any sexual strategy. So clearly, the question remains: should sex be considered a solution for reproduction? Most proponents of Fisher [2] would answer yes but Lode [5] is tempted to say no. In his recent essay, the author proposed an alternative theory to explain the existence of sex. To do so, Lode uncoupled the concepts of sex and reproduction whereby the former is defined as a genetic exchange between two organisms through meiosis. In fact, Lode suggests that sex originated from an archaic gene transfer process among prebiotic bubbles. Considering important and primitive conditions such as the spontaneous formation of these prebiotic bubbles, the promiscuity of such bubbles allowing for the transfer of genetic material and the initiation of meiotic recombination, the author proposes the exploration of a new theory for the origin of sex, the libertine bubble theory [5]. Taken out of the context of reproduction, this gene transfer could be simply regarded as a trophic exchange [6] leading to the beneficial integration of DNA fragments which would then be selected or discarded due to genetic drift. The runaway process of sexual evolution, in which increased efficiency of genetic exchange provides adaptive advantages to sexual species, in turn selecting for more sexual exchange, is conventionally part of evolutionary textbooks and the core of the sexual evolution literature. Departing from the classical view that the advantages of sex in promoting variation are the main reasons for its maintenance, Lode’s hypothesis for the origin of sex presents some interest. First, it remains parsimonious only requiring an asymmetrical exchange of genes between hungry prebiotic bubbles. Second, the conceptual separation of sex and reproduction allows for a new research framework whereby cell, developmental and molecular biologists could shed new light on the origins of sexual mechanisms. However, while both the origin of sex and its maintenance are part of this essay, they would benefit from being dealt with separately. In fact, if the libertine bubble theory is ever proven true, it will not answer all the questions for the dual maintenance of sexuality and asexuality nor the combination of both strategies in organisms such as aphids [7]. Ultimately, the investigation of simple gene transfer mechanisms that may have provided circumstances permissive for the evolution of the highly complex and constrained sexual pathways will be a first step towards the advancement of the libertine bubble theory. Alternatively, phylogenetic studies of ancestral groups which diversified both in their asexual and sexual lineages (e.g. rotifers [8]) might help to disentanglewho came first andwhy theymaintain through evolutionary times.

Related Organizations
Keywords

Reproduction, Animals, Humans, Sex, Biological Evolution

  • BIP!
    Impact byBIP!
    citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    3
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
Powered by OpenAIRE graph
Found an issue? Give us feedback
citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
3
Average
Average
Average
Upload OA version
Are you the author? Do you have the OA version of this publication?