The First Sexual Lineage and the Relevance of Facultative Sex

@article{Dacks1999TheFS,
  title={The First Sexual Lineage and the Relevance of Facultative Sex},
  author={Joel B. Dacks and Andrew J. Roger},
  journal={Journal of Molecular Evolution},
  year={1999},
  volume={48},
  pages={779-783}
}
Abstract. Models for the origin of the sex incorporate either obligate or facultative sexual cycles. The relevance of each assumption to the ancestral sexual population can be examined by surveying the sexual cycles of eukaryotes, and by determining the first lineage to diverge after sexuality evolved. Two protistan groups, the parabasalids and the oxymonads, have been suggested to be early-branching sexual lineages. A maximum-likelihood analysis of elongation factor-1α sequences shows that the… 
View on Springer
ncbi.nlm.nih.gov
144 Citations
Highly Influential Citations
6
Background Citations
58
Methods Citations
2
Results Citations
5

144 Citations

Evidence for maintenance of sex determinants but not of sexual stages in red yeasts, a group of early diverged basidiomycetes
TLDR
The majority of both sexual and asexual species of red yeasts have functional pheromone receptors and homeodomain homologues, which makes the separation between sexual and the frequent existence of asexual strains within sexual species imprecise.
Secretive ciliates and putative asexuality in microbial eukaryotes.
Genomic signatures of ancient asexual lineages
TLDR
A review and classification of the predicted effects of loss of sex on the eukaryotic genome is presented and the utility of the various predictions for detecting ancient asexuality, for testing hypotheses of the reversibility of a transition to a sexual phase, and for discriminating between theories of sex is discussed.
Fitness-Associated Sexual Reproduction in a Filamentous Fungus
A Phylogenomic Inventory of Meiotic Genes Evidence for Sex in Giardia and an Early Eukaryotic Origin of Meiosis
Sexual Conflict, Facultative Asexuality, and the True Paradox of Sex.
On the Origin of Sex
TLDR
This work has suggested that sex of eukaryotes was originated as a result of long-term evolution of non-coding DNAs in a genome at one of the branches of prokaryotes.
Gamete differentiation : a genetic, biochemical and evolutionary study using Ectocarpus siliculosus
TLDR
This thesis has offered the first insight into protist gametes transcriptomes, revealing complex, functional organization and differentiation according to the adopted sexual roles, as well as evolutionary variation of sex biased genes.
Is asexual reproduction an evolutionary dead end in lichens?
TLDR
The greater number of forward compared to reverse transitions is consistent with dogma in both lichenology and evolutionary biology, but nonetheless this study documents numerous reverse transitions, suggesting that asexual lineages represent a source for evolutionary innovation.
Using a meiosis detection toolkit to investigate ancient asexual "scandals" and the evolution of sex.
  • A. Schurko, J. Logsdon
  • Biology
    BioEssays : news and reviews in molecular, cellular and developmental biology
  • 2008
TLDR
A "meiosis detection toolkit", a set of meiotic genes that represent the best markers for the presence of meiosis that will help to understand both meiotic gene evolution and the capacity for meiosis and sex in putative obligate asexuals.
...
...

References

SHOWING 1-10 OF 65 REFERENCES
Sex and evolution.
This book explores the relationship between various types of reproduction and the evolutionary process. Starting with the concept of meiosis, George C. Williams states the conditions under which an…
Recent advances in understanding of the evolution and maintenance of sex.
Sexual reproduction as an adaptation to resist parasites (a review).
TLDR
P parasite coevolution is superior to previous models of the evolution of sex by supporting the stability of sex under the following challenging conditions: very low fecundity, realistic patterns of genotype fitness and changing environment, and frequent mutation to parthenogenesis, even while sex pays the full 2-fold cost.
The origin of red algae: implications for plastid evolution.
  • J. Stiller, B. Hall
  • Biology
    Proceedings of the National Academy of Sciences of the United States of America
  • 1997
TLDR
Phylogenetic analyses provide strong statistical support for an early evolutionary emergence of the Rhodophyta that preceded the origin of the line that led to plants, animals, and fungi, and argue for a reexamination of current models of plastid evolution.
Problems in the development of an explicit hypothetical phylogeny of the lower eukaryotes.
Are eukaryotic microorganisms clonal or sexual? A population genetics vantage.
TLDR
It is argued that the mode of reproduction of microorganisms in nature can only be decided by population genetic information, and many parasitic protozoa and unicellular fungi have clonal rather than sexual population structures, which has major consequences for medical research and practice.
An evaluation of elongation factor 1 alpha as a phylogenetic marker for eukaryotes.
TLDR
The results suggest that the phylogenies obtained from EF-1 alpha are congruent with other molecular phylogenies in recovering the monophyly of groups such as the Metazoa, Fungi, Magnoliophyta, and Euglenozoa, however, the interrelationships between these and other protist lineages are not well resolved.
Limited dispersal, deleterious mutations and the evolution of sex.
TLDR
This study presents a mathematical model that allows for some offspring to be dispersed at random, while others stay close to their mothers, and it is shown that, at equilibrium, the frequency of deleterious mutations in the population is inversely related to the rate of dispersal.
What use is sex?
Ancestral relationships of the major eukaryotic lineages.
TLDR
The molecular phylogenies suggest that multiple endosymbiotic events introduced plastids into discrete eukaryotic lineages, some as ancient as the separation of the prokaryotic domains.
...
...