Sexual conflict resolved by invasion of a novel sex determiner in Lake Malawi cichlid fishes

Sex determination mechanisms differ among animal species, but it is not clear how these differences evolve. New sex determiners may arise in response to sexual conflicts, which occur when traits benefit one sex but hinder the other. We identified the genetic basis for the orange-blotch (OB) color pa...

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Vydané v:Science (American Association for the Advancement of Science) Ročník 326; číslo 5955; s. 998
Hlavní autori: Roberts, Reade B, Ser, Jennifer R, Kocher, Thomas D
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: United States 13.11.2009
Predmet:
Africa, Eastern
Animals
Biological Evolution
Chromosome Mapping
Cichlids - genetics
Cichlids - physiology
Female
Fresh Water
Gene Expression Regulation
Genetic Fitness
Genetic Speciation
Haplotypes
Linkage Disequilibrium
Male
Mating Preference, Animal
Melanophores - cytology
Melanophores - metabolism
Microsatellite Repeats
Molecular Sequence Data
PAX7 Transcription Factor - genetics
Phenotype
Pigmentation - genetics
Polymorphism, Single Nucleotide
Selection, Genetic
Sex Characteristics
Sex Determination Processes
Sexual Behavior, Animal
Africa, Eastern
ISSN:1095-9203, 1095-9203
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Shrnutí:Sex determination mechanisms differ among animal species, but it is not clear how these differences evolve. New sex determiners may arise in response to sexual conflicts, which occur when traits benefit one sex but hinder the other. We identified the genetic basis for the orange-blotch (OB) color pattern, a trait under sexually antagonistic selection in the cichlid fish of Lake Malawi, East Africa. The OB phenotype is due to a cis-regulatory mutation in the Pax7 gene. OB provides benefits of camouflage to females but disrupts the species-specific male color patterns used for mate recognition. We suggest that the resulting sexual conflict over the OB allele has been resolved by selection for a novel female sex determination locus that has invaded populations with an ancestral male sex determination system.
Bibliografia:ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:1095-9203
1095-9203
DOI:10.1126/science.1174705