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Discovery of Drosophila melanogaster from wild African environments and genomic insights into species history

Sprengelmeyer, Quentin D; Mansourian, Suzan LU ; Lange, Jermy D; Matute, Daniel R; Cooper, Brandon S; Jirle, Erling LU ; Stensmyr, Marcus LU and Pool, John E (2018)
Abstract
A long-standing enigma concerns the geographic and ecological origins of the intensively studied vinegar fly, Drosophila melanogaster, a globally widespread species [1] which “has invariably appeared to be a strict human commensal” [2]. In spite of its sub-Saharan origins, this species has never been reported from undisturbed wilderness environments that might reflect its pre-commensal niche [3]. Here, we document the collection of 288 D. melanogaster individuals from African wilderness areas in Zambia, Zimbabwe, and Namibia. After sequencing the genomes of 17 flies collected from Kafue National Park, Zambia, we found reduced genetic diversity relative to town populations, elevated chromosomal inversion frequencies, and strong differences... (More)
A long-standing enigma concerns the geographic and ecological origins of the intensively studied vinegar fly, Drosophila melanogaster, a globally widespread species [1] which “has invariably appeared to be a strict human commensal” [2]. In spite of its sub-Saharan origins, this species has never been reported from undisturbed wilderness environments that might reflect its pre-commensal niche [3]. Here, we document the collection of 288 D. melanogaster individuals from African wilderness areas in Zambia, Zimbabwe, and Namibia. After sequencing the genomes of 17 flies collected from Kafue National Park, Zambia, we found reduced genetic diversity relative to town populations, elevated chromosomal inversion frequencies, and strong differences at specific genes including known insecticide targets. Combining these new genomes with prior data enabled us to gain novel insights into the history of this species’ geographic expansion. Our demographic estimates indicated that an expansion from southern Africa began approximately 10,000 years ago, with a Saharan crossing soon after, but expansion from the Middle East into Europe did not begin until roughly 1,400 years ago. This improved model of demographic history will provide a critical resource for future evolutionary and genomic studies of this key model organism. Our results add historical context to the species’ human association, and the opportunity to study wilderness populations opens the door for future studies on the biological basis of its adaptation to human environments. (Less)
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author
organization
publishing date
type
Other contribution
publication status
submitted
keywords
entomology, genetics, Biogeography
pages
13 pages
publisher
bioRxiv
DOI
10.1101/470765
language
English
LU publication?
yes
id
0902312e-d336-4702-ac32-9312c244c25b
date added to LUP
2019-06-19 14:21:55
date last changed
2019-06-19 14:23:42
@misc{0902312e-d336-4702-ac32-9312c244c25b,
  abstract     = {A long-standing enigma concerns the geographic and ecological origins of the intensively studied vinegar fly, Drosophila melanogaster, a globally widespread species [1] which “has invariably appeared to be a strict human commensal” [2]. In spite of its sub-Saharan origins, this species has never been reported from undisturbed wilderness environments that might reflect its pre-commensal niche [3]. Here, we document the collection of 288 D. melanogaster individuals from African wilderness areas in Zambia, Zimbabwe, and Namibia. After sequencing the genomes of 17 flies collected from Kafue National Park, Zambia, we found reduced genetic diversity relative to town populations, elevated chromosomal inversion frequencies, and strong differences at specific genes including known insecticide targets. Combining these new genomes with prior data enabled us to gain novel insights into the history of this species’ geographic expansion. Our demographic estimates indicated that an expansion from southern Africa began approximately 10,000 years ago, with a Saharan crossing soon after, but expansion from the Middle East into Europe did not begin until roughly 1,400 years ago. This improved model of demographic history will provide a critical resource for future evolutionary and genomic studies of this key model organism. Our results add historical context to the species’ human association, and the opportunity to study wilderness populations opens the door for future studies on the biological basis of its adaptation to human environments.},
  author       = {Sprengelmeyer, Quentin D and Mansourian, Suzan and Lange, Jermy D and Matute, Daniel R and Cooper, Brandon S and Jirle, Erling and Stensmyr, Marcus and Pool, John E},
  keyword      = {entomology,genetics,Biogeography},
  language     = {eng},
  month        = {11},
  pages        = {13},
  publisher    = {bioRxiv},
  title        = {Discovery of Drosophila melanogaster from wild African environments and genomic insights into species history},
  url          = {http://dx.doi.org/10.1101/470765},
  year         = {2018},
}