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Reference-Free Population Genomics from Next-Generation Transcriptome Data and the Vertebrate-Invertebrate Gap

Title
Reference-Free Population Genomics from Next-Generation Transcriptome Data and the Vertebrate-Invertebrate Gap
Type
Article in International Scientific Journal
Year
2013
Authors
Philippe Gayral
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Jose Melo Ferreira
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Sylvain Glemin
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Nicolas Bierne
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Miguel Carneiro
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Benoit Nabholz
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Joao M Lourenco
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Marion Ballenghien
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Nicolas Faivre
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Khalid Belkhir
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Vincent Cahais
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Etienne Loire
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Aurelien Bernard
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Nicolas Galtier
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Journal
Title: Plos GeneticsImported from Authenticus Search for Journal Publications
Vol. 9
Final page: e1003457
ISSN: 1553-7390
Scientific classification
FOS: Natural sciences > Earth and related Environmental sciences
Other information
Authenticus ID: P-005-1XN
Abstract (EN): In animals, the population genomic literature is dominated by two taxa, namely mammals and drosophilids, in which fully sequenced, well-annotated genomes have been available for years. Data from other metazoan phyla are scarce, probably because the vast majority of living species still lack a closely related reference genome. Here we achieve de novo, reference-free population genomic analysis from wild samples in five non-model animal species, based on next-generation sequencing transcriptome data. We introduce a pipe-line for cDNA assembly, read mapping, SNP/genotype calling, and data cleaning, with specific focus on the issue of hidden paralogy detection. In two species for which a reference genome is available, similar results were obtained whether the reference was used or not, demonstrating the robustness of our de novo inferences. The population genomic profile of a hare, a turtle, an oyster, a tunicate, and a termite were found to be intermediate between those of human and Drosophila, indicating that the discordant genomic diversity patterns that have been reported between these two species do not reflect a generalized vertebrate versus invertebrate gap. The genomic average diversity was generally higher in invertebrates than in vertebrates (with the notable exception of termite), in agreement with the notion that population size tends to be larger in the former than in the latter. The non-synonymous to synonymous ratio, however, did not differ significantly between vertebrates and invertebrates, even though it was negatively correlated with genetic diversity within each of the two groups. This study opens promising perspective regarding genome-wide population analyses of non-model organisms and the influence of population size on non-synonymous versus synonymous diversity.
Language: English
Type (Professor's evaluation): Scientific
Contact: nicolas.galtier@univ-montp2.fr
No. of pages: 15
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