Gene Flow in House Mice: Introduction of a New Allele Into Free-Living Populations

Evolution ◽  
1981 ◽  
Vol 35 (2) ◽  
pp. 243 ◽  
Author(s):  
Ann Eileen Miller Baker
Keyword(s):  
Gene Flow ◽  
House Mice ◽  
Free Living

scholarly journals A longitudinal study of phenotypic changes in early domestication of house mice

2018 ◽  
Vol 5 (3) ◽  
pp. 172099 ◽  
Author(s):  
Madeleine Geiger ◽  
Marcelo R. Sánchez-Villagra ◽  
Anna K. Lindholm
Keyword(s):  
Longitudinal Study ◽  
Experimental Studies ◽  
House Mice ◽  
Free Living ◽  
Mouse Population ◽  
Domestication Syndrome ◽  
Phenotypic Changes ◽  
Wild House Mice ◽  
Term Data

Similar phenotypic changes occur across many species as a result of domestication, e.g. in pigmentation and snout size. Experimental studies of domestication have concentrated on intense and directed selection regimes, while conditions that approximate the commensal and indirect interactions with humans have not been explored. We examine long-term data on a free-living population of wild house mice that have been indirectly selected for tameness by regular exposure to humans. In the course of a decade, this mouse population exhibited significantly increased occurrence of white patches of fur and decreased head length. These phenotypic changes fit to the predictions of the ‘domestication syndrome'.

Genetic diversity of the lichen-forming alga, Diplosphaera chodatii, in North America and Europe

2013 ◽  
Vol 45 (6) ◽  
pp. 799-813 ◽  
Author(s):  
Kyle M. FONTAINE ◽  
Elfie STOCKER-WÖRGÖTTER ◽  
Tom BOOTH ◽  
Michele D. PIERCEY-NORMORE
Keyword(s):  
Genetic Diversity ◽  
Population Structure ◽  
Gene Flow ◽  
North America ◽  
Isolation By Distance ◽  
Water Level Fluctuations ◽  
Free Living ◽  
Climatic Zones ◽  
Algal Symbiont ◽  
Low Levels

AbstractDermatocarpon luridum is a subaquatic lichen which is distributed within temperate climatic zones around the world. It colonizes rock substrata along the shoreline of lakes and rivers of watersheds that regularly experience water level fluctuations. The mycobiont produces perithecia with small, simple spores that are thought to be wind dispersed. The photobiont, Diplosphaera chodatii, occurs both free-living and lichenized but little is known about its distribution and dispersal. The goal of this study was to compare the population structure of the photobiont from lakes and rivers in central North America with those of Europe. Specimens were collected in Manitoba, Canada and Austria. Population structure of the algal symbiont was assessed using the internal transcribed spacer (ITS) of ribosomal DNA (rDNA) and actin gene sequences. Results showed that genetic diversity and gene flow was high within local populations, but gene flow was low between continental populations. Low levels of gene flow between the most distant populations support the isolation-by-distance theory. The photobiont on both continents is also reported to be the photobiont for other lichen species contributing to photobiont availability for D. luridum.

Hybridization and gene flow in house mice introduced into an existing population on an island

1991 ◽  
Vol 225 (4) ◽  
pp. 615-632 ◽  
Author(s):  
R. J. Berry ◽  
G. S. Triggs ◽  
P. King ◽  
H. R. Nash ◽  
L. R. Noble
Keyword(s):  
Gene Flow ◽  
House Mice

scholarly journals Maintenance of Sympatric and Allopatric Populations in Free-Living Terrestrial Bacteria

mBio ◽  
2019 ◽  
Vol 10 (5) ◽  
Author(s):  
Alexander B. Chase ◽  
Philip Arevalo ◽  
Eoin L. Brodie ◽  
Martin F. Polz ◽  
Ulas Karaoz ◽  
...  
Keyword(s):  
Population Structure ◽  
Gene Flow ◽  
Isolation By Distance ◽  
Dispersal Limitation ◽  
Genomic Diversity ◽  
Gene Content ◽  
Microbial Populations ◽  
Free Living ◽  
Phylogenetic Structure ◽  
Isolation By Environment

ABSTRACT For free-living bacteria and archaea, the equivalent of the biological species concept does not exist, creating several obstacles to the study of the processes contributing to microbial diversification. These obstacles are particularly high in soil, where high bacterial diversity inhibits the study of closely related genotypes and therefore the factors structuring microbial populations. Here, we isolated strains within a single Curtobacterium ecotype from surface soil (leaf litter) across a regional climate gradient and investigated the phylogenetic structure, recombination, and flexible gene content of this genomic diversity to infer patterns of gene flow. Our results indicate that microbial populations are delineated by gene flow discontinuities, with distinct populations cooccurring at multiple sites. Bacterial population structure was further delineated by genomic features allowing for the identification of candidate genes possibly contributing to local adaptation. These results suggest that the genetic structure within this bacterium is maintained both by ecological specialization in localized microenvironments (isolation by environment) and by dispersal limitation between geographic locations (isolation by distance). IMPORTANCE Due to the promiscuous exchange of genetic material and asexual reproduction, delineating microbial species (and, by extension, populations) remains challenging. Because of this, the vast majority of microbial studies assessing population structure often compare divergent strains from disparate environments under varied selective pressures. Here, we investigated the population structure within a single bacterial ecotype, a unit equivalent to a eukaryotic species, defined as highly clustered genotypic and phenotypic strains with the same ecological niche. Using a combination of genomic and computational analyses, we assessed the phylogenetic structure, extent of recombination, and flexible gene content of this genomic diversity to infer patterns of gene flow. To our knowledge, this study is the first to do so for a dominant soil bacterium. Our results indicate that bacterial soil populations, similarly to those in other environments, are structured by gene flow discontinuities and exhibit distributional patterns consistent with both isolation by distance and isolation by environment. Thus, both dispersal limitation and local environments contribute to the divergence among closely related soil bacteria as observed in macroorganisms.

scholarly journals Food preferences of wild house-mice (Mus musculus L.)

1974 ◽  
Vol 73 (3) ◽  
pp. 473-478 ◽  
Author(s):  
F. P. Rowe ◽  
A. Bradfield ◽  
R. Redfern
Keyword(s):  
Mus Musculus ◽  
Corn Oil ◽  
Food Preferences ◽  
Mineral Oil ◽  
House Mice ◽  
Free Living ◽  
Choice Tests ◽  
Wild House Mice ◽  
Phalaris Canariensis

SummaryThe relative acceptance of various plain foods by wild house-mice (Mus musculus L.) was compared in laboratory choice tests. The palatability of glycerine and six oils, each included at 5% in pinhead oatmeal, was compared in a similar manner.The most favoured food was found to be whole canary seed (Phalaris canariensis). Pinhead oatmeal and wheat were also comparatively well accepted. Glycerine, corn oil, arachis oil and mineral oil were more palatable than either olive, linseed or cod-liver oils.The results of the choice tests are considered in relation to the use of poison baits for the control of free-living mice.

scholarly journals Dispersal and gene flow in free-living marine nematodes

2013 ◽  
Vol 10 (1) ◽  
pp. 1 ◽  
Author(s):  
Sofie Derycke ◽  
Thierry Backeljau ◽  
Tom Moens
Keyword(s):  
Gene Flow ◽  
Marine Nematodes ◽  
Free Living

Gene flow in house mice: Behavior in a population cage

1981 ◽  
Vol 8 (2) ◽  
pp. 83-90 ◽  
Author(s):  
Ann Eileen Miller Baker
Keyword(s):  
Gene Flow ◽  
House Mice ◽  
Population Cage

scholarly journals Genomic incompatibilities in the hybrid zone between house mice in Denmark: evidence from steep and non-coincident chromosomal clines for Robertsonian fusions

1996 ◽  
Vol 67 (2) ◽  
pp. 123-134 ◽  
Author(s):  
Fabienne Fel-Clair ◽  
Thomas Lenormand ◽  
Josette Catalan ◽  
Jacqueline Grobert ◽  
Annie Orth ◽  
...  
Keyword(s):  
Gene Flow ◽  
Hybrid Zone ◽  
No Reduction ◽  
House Mice ◽  
Pattern Selection ◽  
Chromosomal Variation ◽  
Mus Musculus Domesticus ◽  
Chromosomal Differentiation ◽  
The Difference ◽  
Best Fit

SummaryThe pattern of chromosomal variation is investigated in house mice from the Danish hybrid zone between the translocation-prone Mus musculus domesticus and the chromosomally conservative M. m. musculus. The cytogenetic analysis confirmed the non-introgression of three pairs of Robertsonian (Rb) fusions from M. m. domesticus into the M. m. musculus genome. The geographic distribution of two of these Rb fusions was shown to follow staggered chromosomal clines which increased in steepness the closer they were to the centre of the hybrid zone as defined by allozymes. Analysis of alternate hypotheses suggests that chromosomal differentiation of the Danish domesticus occurred after contact was established with musculus. The staggering of the clines would reflect the order of arrival of theRb fusions into the hybrid zone. Several models with different processes of underdominance of the chromosomal heterozygotes are discussed to account for the difference in width between clines. A selective model with increasing levels of genomic underdominance due to interaction with a progressively enriched musculus genome provides the best fit for the observed pattern. Selection against Rb fusions with little effect on the recombination of linked allozyme markers supportsthe view that no reduction in gene flow due to chromosomal heterozygosity is yet apparent through the hybrid zone and that only the centromeric segments of the Rb fusions are incompatible with the musculus genome.

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