Meiosis and Its Deviations in Polyploid Animals

@article{Stenberg2013MeiosisAI,
  title={Meiosis and Its Deviations in Polyploid Animals},
  author={Per Stenberg and Anssi Saura},
  journal={Cytogenetic and Genome Research},
  year={2013},
  volume={140},
  pages={185 - 203}
}
We review the different modes of meiosis and its deviations encountered in polyploid animals. Bisexual reproduction involving normal meiosis occurs in some allopolyploid frogs with variable degrees of polyploidy. Aberrant modes of bisexual reproduction include gynogenesis, where a sperm stimulates the egg to develop. The sperm may enter the egg but there is no fertilization and syngamy. In hybridogenesis, a genome is eliminated to produce haploid or diploid eggs or sperm. Ploidy can be elevated… Expand
Meiosis completion and various sperm responses lead to unisexual and sexual reproduction modes in one clone of polyploid Carassius gibelio
TLDR
Normal meiosis completion was confirmed, three types of various nuclear events and development behaviors were revealed during the first mitosis in the fertilized eggs by three kinds of different sperms, and evolutionary consequences of reproduction mode diversity in polyploid vertebrates were highlighted. Expand
Parthenogenesis as a Solution to Hybrid Sterility: The Mechanistic Basis of Meiotic Distortions in Clonal and Sterile Hybrids
TLDR
It is demonstrated that the emergence of asexuality can remedy hybrid sterility in a sex-specific manner and contributes to the speciation process. Expand
Challenges and Costs of Asexuality: Variation in Premeiotic Genome Duplication in Gynogenetic Hybrids from Cobitis taenia Complex
The transition from sexual reproduction to asexuality is often triggered by hybridization. The gametogenesis of many hybrid asexuals involves premeiotic genome endoreplication leading to bypassExpand
Challenges and costs of asexuality: Variation in premeiotic genome duplication in gynogenetic hybrids from Cobitis taenia complex
TLDR
It is found that naturally as well as experimentally produced F1 hybrid strains undergo an obligatory genome duplication event to achieve asexuality, occurring in the gonocytes just before entering meiosis or, rarely, one or few divisions before meiosis. Expand
Clonal gametogenesis is triggered by intrinsic stimuli in the hybrid’s germ cells but is dependent on sex differentiation
TLDR
Gametogenesis in the Cobitis taenia hybrid complex, which involves sexually reproducing species as well as their hybrids, is investigated and the ability of clonal gametogenesis occurred exclusively in hybrid germ cells, suggesting that asexual development is directly triggered by the hybrid genomic constitution of the cell. Expand
Is premeiotic genome elimination an exclusive mechanism for hemiclonal reproduction in hybrid males of the genus Pelophylax?
TLDR
It is proposed that genome elimination from the germline can be postponed to the meiotic stages or absent altogether in these hybrids, and at least two pathways of meiotic mechanisms are identified. Expand
Parthenogenesis as a solution to hybrid sterility: the mechanistic basis of meiotic distortions in clonal and sterile hybrids
TLDR
It is reported that speciation proceeds through a previously unnoticed stage at which gene flow is completely interrupted on side of both hybrid’s sexes, although only male hybrids are sterile, while female fertility is rescued due to a particular gametogenetic deviation leading to formation of clonal gametes. Expand
The challenge of evolving stable polyploidy: could an increase in “crossover interference distance” play a central role?
TLDR
It is proposed that a critical feature in the evolution of these more effective chiasma patterns is an increase in the effective distance of meiotic crossover interference, which plays a central role in crossover positioning. Expand
Sex chromosomes in meiotic, hemiclonal, clonal and polyploid hybrid vertebrates: along the ‘extended speciation continuum'
TLDR
It is hypothesized that pre-/meiotic aberrations in all-female ZW-hybrids present Haldane-effects promoting their evolution, crucial for insights into the evolution of sex, ‘asexuality' and polyploidy. Expand
Variation in hybridogenetic hybrid emergence between populations of water frogs from the Pelophylax esculentus complex
TLDR
After analysing tadpole karyotypes, it is concluded that in both studied populations, the majority of diploid hybrid males produced haploid gametes with the P. ridibundus genome after elimination of theP. Expand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 182 REFERENCES
Simultaneous Mendelian and clonal genome transmission in a sexually reproducing, all-triploid vertebrate
TLDR
This work conducts sibship analyses with co-dominant microsatellite markers so as to confirm the purely clonal and maternal transmission of the NOR− set, and to demonstrate Mendelian segregation and recombination of theNOR+ sets in both sexes. Expand
Occasional sex in an ‘asexual’ polyploid hermaphrodite
TLDR
It is concluded that genetic recombination does not necessarily require segregation and fusion within the same generation, as is the case in most sexual species. Expand
Automictic parthenogenesis in the diploid-triploid stick insect Bacillus atticus and its flexibility leading to heterospecific diploid hybrids
TLDR
The maintenance of some recombination during prophase I and the ability to produce diploid and triploid hybrids demonstrates that these parthenogenetic strains are neither invariant nor reproductively isolated from related taxa, as also occurs in other unisexuals. Expand
Sister Chromosome Pairing Maintains Heterozygosity in Parthenogenetic Lizards
TLDR
It is shown that meiosis commences with twice the number of chromosomes in parthenogenetic versus sexual species, a mechanism that provides the basis for generating gametes with unreduced chromosome content without fundamental deviation from the classic meiotic program. Expand
Automictic Reproduction in Interspecific Hybrids of Poeciliid Fish
TLDR
The mechanism described here can explain facultative parthenogenesis, as well as varying ploidy levels reported in different animal groups, and at least some of the reported cases of triploidy in humans can now be traced back to automixis. Expand
SYNTHESIS OF CLONALITY AND POLYPLOIDY IN VERTEBRATE ANIMALS BY HYBRIDIZATION BETWEEN TWO SEXUAL SPECIES
TLDR
The reconstruction of the evolutionary route from sexuality to clonality and polyploidy in these fish shows that cl onality and gynogenesis may have been directly triggered by interspecific hybridization and that polyploidsy is a consequence, not a cause, of clonalities. Expand
Metasexual Stick Insects: Model Pathways to Losing Sex and Bringing It Back
This chapter illustrates the variety of parthenogenetic mechanisms within three genera of phasmids (stick insects) occurring around the Mediterranean and the close ties between sexuals and asexuals.Expand
Abortive meiosis in the oogenesis of parthenogenetic Daphnia pulex
TLDR
The objective of this research was to precisely reveal the process and mechanism of parthenogenetic oogenesis and maintenance of diploidy in Daphnia pulex through histology, karyology, and immunohistochemistry and to hypothesize that D. pules switches reproductive mode depending on whether the egg is fertilized or not. Expand
Laboratory synthesis of an independently reproducing vertebrate species
TLDR
The results confirm the hypothesis that secondary hybridization events can lead to asexual lineages of increased ploidy when favorable combinations of parental genomes are assembled and confirm that these animals will be a critical tool in understanding the mechanisms underlying the origin and subsequent evolution of asexual amniotes. Expand
Meiotic mechanisms in a parthenogenetic grasshopper species and its hybrids with related bisexual species
TLDR
The genetic system of the all-female Australian grasshopper species Warramaba virgo is of a type which is now familiar in parthenogenetic vertebrates, but is very uncommon in parthensogenetic insects. Expand
...
1
2
3
4
5
...