The March of the Beetles: Epistatic Components Dominate Divergence in Dispersal Tendency in Tribolium castaneum.
J Hered
; 111(5): 498-505, 2020 09 30.
Article
en En
| MEDLINE
| ID: mdl-32798223
ABSTRACT
The genetic underpinnings of traits are rarely simple. Most traits of interest are instead the product of multiple genes acting in concert to determine the phenotype. This is particularly true for behavioral traits, like dispersal. Our investigation focuses on the genetic architecture of dispersal tendency in the red flour beetle, Tribolium castaneum. We used artificial selection to generate lines with either high or low dispersal tendency. Our populations responded quickly in the first generations of selection and almost all replicates had higher dispersal tendency in males than in females. These selection lines were used to create a total of 6 additional lines F1 and reciprocal F1, as well as 4 types of backcrosses. We estimated the composite genetic effects that contribute to divergence in dispersal tendency among lines using line cross-analysis. We found variation in the dispersal tendency of our lines was best explained by autosomal additive and 3 epistatic components. Our results indicate that dispersal tendency is heritable, but much of the divergence in our selection lines was due to epistatic effects. These results are consistent with other life-history traits that are predicted to maintain more epistatic variance than additive variance and highlight the potential for epistatic variation to act as an adaptive reserve that may become visible to selection when a population is subdivided.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Tribolium
/
Cruzamientos Genéticos
/
Epistasis Genética
/
Genética de Población
Tipo de estudio:
Prognostic_studies
Límite:
Animals
Idioma:
En
Revista:
J Hered
Año:
2020
Tipo del documento:
Article