scholarly journals Natural Isolates ofSaccharomyces cerevisiaeDisplay Complex Genetic Variation in Sporulation Efficiency

Genetics ◽  
2006 ◽  
Vol 174 (2) ◽  
pp. 985-997 ◽  
Author(s):  
Justin P. Gerke ◽  
Christina T. L. Chen ◽  
Barak A. Cohen
Keyword(s):  
Genetic Variation ◽  
Sporulation Efficiency ◽  
Natural Isolates

Population Genetics ofCaenorhabditis elegans: The Paradox of Low Polymorphism in a Widespread Species

Genetics ◽  
2003 ◽  
Vol 163 (1) ◽  
pp. 147-157 ◽  
Author(s):  
Arjun Sivasundar ◽  
Jody Hey
Keyword(s):  
Genetic Variation ◽  
Microsatellite Loci ◽  
Population Expansion ◽  
Widespread Species ◽  
C Elegans ◽  
Model Research ◽  
The World ◽  
Natural Isolates ◽  
History Of ◽  
Low Levels

AbstractCaenorhabditis elegans has become one of the most widely used model research organisms, yet we have little information on evolutionary processes and recent evolutionary history of this widespread species. We examined patterns of variation at 20 microsatellite loci in a sample of 23 natural isolates of C. elegans from various parts of the world. One-half of the loci were monomorphic among all strains, and overall genetic variation at microsatellite loci was low, relative to most other species. Some population structure was detected, but there was no association between the genetic and geographic distances among different natural isolates. Thus, despite the nearly worldwide occurrence of C. elegans, little evidence was found for local adaptation in strains derived from different parts of the world. The low levels of genetic variation within and among populations suggest that recent colonization and population expansion might have occurred. However, the patterns of variation are not consistent with population expansion. A possible explanation for the observed patterns is the action of background selection to reduce polymorphism, coupled with ongoing gene flow among populations worldwide.

scholarly journals Low Genetic Variation and No Detectable Population Structure in Aspergillus fumigatus Compared to Closely Related Neosartorya Species

2006 ◽  
Vol 5 (4) ◽  
pp. 650-657 ◽  
Author(s):  
Carla Rydholm ◽  
George Szakacs ◽  
François Lutzoni
Keyword(s):  
Genetic Variation ◽  
Aspergillus Fumigatus ◽  
Data Set ◽  
Neosartorya Fischeri ◽  
Natural Isolates ◽  
Immunosuppressed Patients ◽  
History Of ◽  
America South ◽  
Population Genetic Variation ◽  
Intensive Work

ABSTRACT Aspergillus fumigatus is an anamorphic euascomycete mold with a ubiquitous presence worldwide. Despite intensive work to understand its success as a pathogen infecting immunosuppressed patients, the population dynamics and recent evolutionary history of A. fumigatus remain understudied. We examined patterns of genetic variation at three intergenic loci for 70 natural isolates from Europe, North America, South America, Asia, Africa, and Australia. The same loci were used to analyze within-population genetic variation for 33 isolates obtained from five geographic locations. Neither data set detected evidence of population differentiation or found any association between the genetic and geographic distances among these isolates. No evidence for genetic differentiation within the two A. fumigatus mating types was detected. The genetic diversity of A. fumigatus, contrasted with that of its close teleomorphic relatives, Neosartorya fischeri and Neosartorya spinosa, is remarkably low.

scholarly journals Sporulation Genes Associated with Sporulation Efficiency in Natural Isolates of Yeast

PLoS ONE ◽  
2013 ◽  
Vol 8 (7) ◽  
pp. e69765 ◽  
Author(s):  
Parul Tomar ◽  
Aatish Bhatia ◽  
Shweta Ramdas ◽  
Liyang Diao ◽  
Gyan Bhanot ◽  
...  
Keyword(s):  
Sporulation Efficiency ◽  
Natural Isolates ◽  
Sporulation Genes

scholarly journals Synonymous Genetic Variation in Natural Isolates ofEscherichia coliDoes Not Predict Where Synonymous Substitutions Occur in a Long-Term Experiment

2015 ◽  
Vol 32 (11) ◽  
pp. 2897-2904 ◽  
Author(s):  
Rohan Maddamsetti ◽  
Philip J. Hatcher ◽  
Stéphane Cruveiller ◽  
Claudine Médigue ◽  
Jeffrey E. Barrick ◽  
...  
Keyword(s):  
Genetic Variation ◽  
Synonymous Substitutions ◽  
Term Experiment ◽  
Long Term Experiment ◽  
Natural Isolates

Genetic variation among natural isolates of the ectomycorrhizal hypogenous fungus, Rhizopogon roseolus from Japanese pine forests inferred using AFLP markers

Mycoscience ◽  
2013 ◽  
Vol 54 (1) ◽  
pp. 13-18 ◽  
Author(s):  
Yasuhito Okuda ◽  
Norihiro Shimomura ◽  
Chisato Funato ◽  
Eiji Nagasawa ◽  
Teruyuki Matsumoto
Keyword(s):  
Genetic Variation ◽  
Aflp Markers ◽  
Pine Forests ◽  
Rhizopogon Roseolus ◽  
Natural Isolates
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