10.5061/DRYAD.KC1Q1
Pujolar, Jose Martin
Aarhus University
Jacobsen, Magnus W.
Aarhus University
Bekkevold, Dorte
Technical University of Denmark
Lobón-Cervia, Javier
Museo Nacional de Ciencias Naturales
Jónsson, Bjarni
Biopol, Marine Biology and Biotechnology Center, Skagastrond, Iceland
Bernatchez, Louis
Université Laval
Hansen, Michael M.
Aarhus University
Data from: Signatures of natural selection between life cycle stages
separated by metamorphosis in European eel
Dryad
dataset
2016
Adaptative decoupling hypothesis
complex life cycles
Anguilla anguilla
Metamorphosis
Holocene
2016-06-23T00:00:00Z
2016-06-23T00:00:00Z
en
https://doi.org/10.1186/s12864-015-1754-3
48371 bytes
1
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Background: Species showing complex life cycles provide excellent
opportunities to study the genetic associations between life cycle stages,
as selective pressures may differ before and after metamorphosis. The
European eel presents a complex life cycle with two metamorphoses, a first
metamorphosis from larvae into glass eels (juvenile stage) and a second
metamorphosis into silver eels (adult stage). We tested the hypothesis
that different genes and gene pathways will be under selection at
different life stages when comparing the genetic associations between
glass eels and silver eels. Results: We used two sets of markers to test
for selection: first, we genotyped individuals using a panel of 80
coding-gene single nucleotide polymorphisms (SNPs) developed in American
eel; second, we investigated selection at the genome level using a total
of 153,423 RAD-sequencing generated SNPs widely distributed across the
genome. Using the RAD approach, outlier tests identified a total of 2413
(1.57 %) potentially selected SNPs. Functional annotation analysis
identified signal transduction pathways as the most over-represented group
of genes, including MAPK/Erk signalling, calcium signalling and GnRH
(gonadotropin-releasing hormone) signalling. Many of the over-represented
pathways were related to growth, while others could result from the
different conditions that eels inhabit during their life cycle.
Conclusions: The observation of different genes and gene pathways under
selection when comparing glass eels vs. silver eels supports the adaptive
decoupling hypothesis for the benefits of metamorphosis. Partitioning the
life cycle into discrete morphological phases may be overall beneficial
since it allows the different life stages to respond independently to
their unique selection pressures. This might translate into a more
effective use of food and niche resources and/or performance of
phase-specific tasks (e.g. feeding in the case of glass eels, migrating
and reproducing in the case of silver eels).
SNP raw dataExcel file containing all SNP raw data for 113
individualsSNP_Table_BMCGenomicspaper.xlsx
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