Feralisation targets different genomic loci to domestication in the chicken.
Feralisation occurs when a domestic population recolonizes the wild, escaping its previous restricted environment, and has been considered as the reverse of domestication. We have previously shown that Kauai Island's feral chickens are a highly variable and admixed population. Here we map selective sweeps in feral Kauai chickens using whole-genome sequencing. The detected sweeps were mostly unique to feralisation and distinct to those selected for during domestication. To ascribe potential phenotypic functions to these genes we utilize a laboratory-controlled equivalent to the Kauai population-an advanced intercross between Red Junglefowl and domestic layer birds that has been used previously for both QTL and expression QTL studies. Certain sweep genes exhibit significant correlations with comb mass, maternal brooding behaviour and fecundity. Our analyses indicate that adaptations to feral and domestic environments involve different genomic regions and feral chickens show some evidence of adaptation at genes associated with sexual selection and reproduction.
AVIAN Behavioural Genomics and Physiology Group, IFM Biology, Department of Zoology, Linköping University, 58183 Linköping, Sweden.
M
M
Johnsson
Department of Zoology, Michigan University, Michigan 48824, USA.
E
E
Gering
Department of Biology, University of Victoria, Victoria, British Columbia, Canada V8P 5C2.
P
P
Willis
UCL Genetics Institute, Department of Genetics, Evolution and Environment, University College London, London WC1E 6BT, UK.
S
S
Lopez
UCL Genetics Institute, Department of Genetics, Evolution and Environment, University College London, London WC1E 6BT, UK.|Centre for Mathematics, Physics and Engineering in the Life Sciences and EXperimental Biology (CoMPLEX), University College London, London WC1E 6BT, UK.
L
L
Van Dorp
UCL Genetics Institute, Department of Genetics, Evolution and Environment, University College London, London WC1E 6BT, UK.
G
G
Hellenthal
AVIAN Behavioural Genomics and Physiology Group, IFM Biology, Department of Zoology, Linköping University, 58183 Linköping, Sweden.
R
R
Henriksen
AVIAN Behavioural Genomics and Physiology Group, IFM Biology, Department of Zoology, Linköping University, 58183 Linköping, Sweden.
U
U
Friberg
AVIAN Behavioural Genomics and Physiology Group, IFM Biology, Department of Zoology, Linköping University, 58183 Linköping, Sweden.
D
D
Wright
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