scholarly journals EVIDENCE FOR OVERDOMINANT SELECTION MAINTAINING X-LINKED FITNESS VARIATION IN DROSOPHILA MELANOGASTER

Evolution ◽  
2006 ◽  
Vol 60 (7) ◽  
pp. 1445
Author(s):  
Tim Connallon ◽  
L. Lacey Knowles
Keyword(s):  
Drosophila Melanogaster ◽  
Overdominant Selection

scholarly journals The effect of selection on the amounts of nucleotide variation within and between allelic classes

1999 ◽  
Vol 73 (1) ◽  
pp. 15-28 ◽  
Author(s):  
HIDEKI INNAN ◽  
FUMIO TAJIMA
Keyword(s):  
Computer Simulation ◽  
Drosophila Melanogaster ◽  
Population Size ◽  
Effective Population Size ◽  
Selection Model ◽  
Mus Domesticus ◽  
Nucleotide Variation ◽  
Effective Population ◽  
Overdominant Selection ◽  
Pairwise Differences

The effect of selection on the amounts of nucleotide variation within and between allelic classes was studied when two allelic classes exist in a population. Two selection models – the genic selection model and the overdominant selection model – were used. The average numbers of pairwise nucleotide differences within two allelic classes were investigated by computer simulation and the average number of pairwise differences between two allelic classes was obtained analytically. It was indicated that selection largely affects the amounts of variation within and between allelic classes. However, the sum of the average numbers of pairwise differences within two allelic classes is nearly constant and always close to θ(θ=4Nμ), even when selection is acting, where N is the effective population size and μ is the mutation rate per sequence per generation. This result suggests that the sum of the average numbers of pairwise differences within two allelic classes can be used to estimate θ. It may be useful for a region where selection may be acting. As examples, several gene regions of Drosophila melanogaster and a region of Mus domesticus were analysed. The effect of recombination on the sum of the average numbers of pairwise differences within two allelic classes was discussed.

Author response for "Location and arrangement of campaniform sensilla in Drosophila melanogaster"

2020 ◽  
Author(s):  
Gesa F. Dinges ◽  
Alexander S. Chockley ◽  
Till Bockemühl ◽  
Kei Ito ◽  
Alexander Blanke ◽  
...  
Keyword(s):  
Drosophila Melanogaster ◽  
Author Response ◽  
Campaniform Sensilla

Live Confocal Analysis of Fertilization and Early Development

2001 ◽  
Vol 7 (S2) ◽  
pp. 1012-1013
Author(s):  
Uyen Tram ◽  
William Sullivan
Keyword(s):  
Drosophila Melanogaster ◽  
Embryonic Development ◽  
Real Time ◽  
Early Development ◽  
Fluorescent Probes ◽  
Primary Defect ◽  
Fluorescent Analysis ◽  
Dynamic Event ◽  
Enormous Amount ◽  
Fluorescent Studies

Embryonic development is a dynamic event and is best studied in live animals in real time. Much of our knowledge of the early events of embryogenesis, however, comes from immunofluourescent analysis of fixed embryos. While these studies provide an enormous amount of information about the organization of different structures during development, they can give only a static glimpse of a very dynamic event. More recently real-time fluorescent studies of living embryos have become much more routine and have given new insights to how different structures and organelles (chromosomes, centrosomes, cytoskeleton, etc.) are coordinately regulated. This is in large part due to the development of commercially available fluorescent probes, GFP technology, and newly developed sensitive fluorescent microscopes. For example, live confocal fluorescent analysis proved essential in determining the primary defect in mutations that disrupt early nuclear divisions in Drosophila melanogaster. For organisms in which GPF transgenics is not available, fluorescent probes that label DNA, microtubules, and actin are available for microinjection.

Apoptosis and development

2003 ◽  
Vol 39 ◽  
pp. 11-24 ◽  
Author(s):  
Justin V McCarthy
Keyword(s):  
Drosophila Melanogaster ◽  
Mammalian Cells ◽  
Cell Number ◽  
Model Organisms ◽  
Biological Processes ◽  
Nematode Caenorhabditis Elegans ◽  
Apoptotic Pathway ◽  
Genetic Pathways ◽  
Evolutionarily Conserved ◽  
Multicellular Organisms

Apoptosis is an evolutionarily conserved process used by multicellular organisms to developmentally regulate cell number or to eliminate cells that are potentially detrimental to the organism. The large diversity of regulators of apoptosis in mammalian cells and their numerous interactions complicate the analysis of their individual functions, particularly in development. The remarkable conservation of apoptotic mechanisms across species has allowed the genetic pathways of apoptosis determined in lower species, such as the nematode Caenorhabditis elegans and the fruitfly Drosophila melanogaster, to act as models for understanding the biology of apoptosis in mammalian cells. Though many components of the apoptotic pathway are conserved between species, the use of additional model organisms has revealed several important differences and supports the use of model organisms in deciphering complex biological processes such as apoptosis.

Insights into amyloid disease from fly models

2014 ◽  
Vol 56 ◽  
pp. 69-83 ◽  
Author(s):  
Ko-Fan Chen ◽  
Damian C. Crowther
Keyword(s):  
Drosophila Melanogaster ◽  
Neurodegenerative Disorders ◽  
Amyloid Β ◽  
Amyloid Β Peptide ◽  
Disease Pathogenesis ◽  
Amyloid Aggregates ◽  
Aβ Amyloid ◽  
Polypeptide Chains ◽  
Amyloid Diseases

The formation of amyloid aggregates is a feature of most, if not all, polypeptide chains. In vivo modelling of this process has been undertaken in the fruitfly Drosophila melanogaster with remarkable success. Models of both neurological and systemic amyloid diseases have been generated and have informed our understanding of disease pathogenesis in two main ways. First, the toxic amyloid species have been at least partially characterized, for example in the case of the Aβ (amyloid β-peptide) associated with Alzheimer's disease. Secondly, the genetic underpinning of model disease-linked phenotypes has been characterized for a number of neurodegenerative disorders. The current challenge is to integrate our understanding of disease-linked processes in the fly with our growing knowledge of human disease, for the benefit of patients.

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