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Natural variation of outcrossing in the hermaphroditic nematode Pristionchus pacificus
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Click, Arielle, Savaliya, Chandni H, Kienle, Simone, Herrmann, Matthias and Pires-da Silva, André Francisco (2009) Natural variation of outcrossing in the hermaphroditic nematode Pristionchus pacificus. BMC Evolutionary Biology, Volume 9 (Number 1). Article no.75. doi:10.1186/1471-2148-9-75 ISSN 1471-2148.
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WRAP_Pires_1471-2148-9-75.pdf - Published Version Available under License ["licenses_description_cc_by_nd_2" not defined]. Download (888Kb) | Preview |
Official URL: http://dx.doi.org/10.1186/1471-2148-9-75
Abstract
Background:
Evolution of selfing can be associated with an increase in fixation of deleterious mutations, which in certain conditions can lead to species extinction. In nematodes, a few species evolved self-fertilization independently, making them excellent model systems to study the evolutionary consequences of this type of mating system.
Results:
Here we determine various parameters that influence outcrossing in the hermaphroditic nematode Pristionchus pacificus and compare them to the better known Caenorhabditis elegans. These nematode species are distinct in terms of genetic diversity, which could be explained by differences in outcrossing rates. We find that, similarly to C. elegans, P. pacificus males are generated at low frequencies from self-fertilizing hermaphrodites and are relatively poor mating partners. Furthermore, crosses between different isolates reveal that hybrids have lower brood sizes than the pure strains, which is a sign of outbreeding depression. In contrast to C. elegans, P. pacificus has lower brood sizes and the male X-bearing sperm is able to outcompete the X-nullo sperm.
Conclusion:
The results indicate that there is no evidence of any selection acting very strongly on P. pacificus males.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QH Natural history > QH301 Biology Q Science > QH Natural history > QH426 Genetics |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- ) | ||||
Library of Congress Subject Headings (LCSH): | Nematodes, Nematodes -- Evolution, Nematodes -- Research, Nematodes -- Genetics | ||||
Journal or Publication Title: | BMC Evolutionary Biology | ||||
Publisher: | Bio Med Central | ||||
ISSN: | 1471-2148 | ||||
Official Date: | 2009 | ||||
Dates: |
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Volume: | Volume 9 | ||||
Number: | Number 1 | ||||
Page Range: | Article no.75 | ||||
DOI: | 10.1186/1471-2148-9-75 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Open Access (Creative Commons) | ||||
Date of first compliant deposit: | 23 December 2015 | ||||
Date of first compliant Open Access: | 23 December 2015 | ||||
Funder: | National Science Foundation (U.S.) (NSF), University of Texas at Arlington (UTA) | ||||
Grant number: | IOB-0615996 (NSF) |
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