NDLI: Population genomics reveals a possible history of backcrossing and recombination in the gynogenetic fish Poecilia formosa

Content Provider	PubMed Central
Author	Alberici, Da Barbiano Laura Gompert, Zachariah Aspbury, Andrea S. Gabor, Caitlin R. Nice, Chris C.
Abstract	Unisexual sperm-dependent vertebrates are of hybrid origins, rare, and predicted to be short-lived as a result of several challenges arising from their mode of reproduction. In particular, because of a lack of recombination, clonal species are predicted to have a low potential to respond to natural selection. However, many unisexual sperm-dependent species persist, and assessing the genetic diversity present in these species is fundamental to understanding how they avoid extinction. We used population genomic methods to assess genotypic variation within the unisexual fish Poecilia formosa. Measures of admixture and population differentiation, as well as clustering analyses, indicate that the genomes of individuals of P. formosa are admixed and intermediate between Poecilia latipinna and Poecilia mexicana, consistent with the hypothesis of their hybrid origins. Bayesian genomic cline analyses indicate that about 12% of sampled loci exhibit patterns consistent with inheritance from only one parent. The estimation of observed heterozygosity clearly suggests that P. formosa is not comprised of direct descendants of a single nonrecombining asexual F1 hybrid individual. Additionally, the estimation of observed heterozygosity provides support for the hypothesis that the history of this unisexual species has included backcrossing with the parent species before the onset of gynogenesis. We also document high levels of variation among asexual individuals, which is attributable to recombination (historical or ongoing) and the accumulation of mutations. The high genetic variation suggests that this unisexual vertebrate has more potential to respond to natural selection than if they were frozen F1 hybrids.
Related Links	http://dx.doi.org/10.1073/pnas.1303730110
Ending Page	13802
Page Count	6
Starting Page	13797
File Format	PDF
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	34
Volume Number	110
Language	English
Publisher	National Academy of Sciences
Publisher Date	2013-08-20
Access Restriction	Open
Rights Holder	National Academy of Sciences
Subject Keyword	General Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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Data from: Population genomics reveals a possible history of backcrossing and recombination in the gynogenetic fish Poecilia formosa (Dataset)

Population genomics reveals a possible history of backcrossing and recombination in the gynogenetic fish Poecilia formosa

Stable Inheritance of Host Species-Derived Microchromosomes in the Gynogenetic Fish Poecilia formosa

Data from: Kin recognition in a clonal fish, Poecilia formosa (Dataset)

The gonadal transcriptome of the unisexual Amazon molly Poecilia formosa in comparison to its sexual ancestors, Poecilia mexicana and Poecilia latipinna

Microsatellites for the gynogenetic Amazon molly,Poecilia formosa: useful tools for detection of mutation rate, ploidy determination and overall genetic diversity

Asexuals looking for sex: conflict between species and mate-quality recognition in sailfin mollies (Poecilia latipinna)

The occurrence of spermatozoa in the ovary of the gynogenetic viviparous teleost Poecilia formosa (POECILIIDAE).

Feeding rates in the sailfin molly Poecilia latipinna and its coexisting sexual parasite, the gynogenetic Amazon molly Poecilia formosa.

Population genomics reveals a possible history of backcrossing and recombination in the gynogenetic fish Poecilia formosa

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Data from: Population genomics reveals a possible history of backcrossing and recombination in the gynogenetic fish Poecilia formosa (Dataset)

Population genomics reveals a possible history of backcrossing and recombination in the gynogenetic fish Poecilia formosa

Stable Inheritance of Host Species-Derived Microchromosomes in the Gynogenetic Fish Poecilia formosa

Data from: Kin recognition in a clonal fish, Poecilia formosa (Dataset)

The gonadal transcriptome of the unisexual Amazon molly Poecilia formosa in comparison to its sexual ancestors, Poecilia mexicana and Poecilia latipinna

Microsatellites for the gynogenetic Amazon molly,Poecilia formosa: useful tools for detection of mutation rate, ploidy determination and overall genetic diversity

Asexuals looking for sex: conflict between species and mate-quality recognition in sailfin mollies (Poecilia latipinna)

The occurrence of spermatozoa in the ovary of the gynogenetic viviparous teleost Poecilia formosa (POECILIIDAE).

Feeding rates in the sailfin molly Poecilia latipinna and its coexisting sexual parasite, the gynogenetic Amazon molly Poecilia formosa.

Population genomics reveals a possible history of backcrossing and recombination in the gynogenetic fish Poecilia formosa