Adaptive evolution and explosive speciation: the cichlid fish model

Key Points The spectacular radiation of 2,000 species of cichlid fishes in East Africa is an ideal model system and natural laboratory for studying evolutionary processes. The explosive speciation of cichlids is probably due to a combination of forces, including natural selection on ecological trait...

Celý popis

Uloženo v:
Podrobná bibliografie
Vydáno v:Nature reviews. Genetics Ročník 5; číslo 4; s. 288 - 298
Hlavní autor: Kocher, Thomas D.
Médium: Journal Article
Jazyk:angličtina
Vydáno: London Nature Publishing Group UK 01.04.2004
Nature Publishing Group
Témata:
Adaptation, Biological
Africa, Eastern
Agriculture
Animal Genetics and Genomics
Animal reproduction
Animals
Biological and medical sciences
Biological Evolution
Biomedical and Life Sciences
Biomedicine
Cancer Research
Cichlidae
Cichlids - genetics
Cichlids - growth & development
Evolution & development
Evolutionary biology
Fish Proteins - genetics
Fundamental and applied biological sciences. Psychology
Gene Function
Genes
Genetic Variation
Genetics
Genetics of eukaryotes. Biological and molecular evolution
Human Genetics
Radiation
review-article
Selection, Genetic
Species Specificity
Africa, Eastern
East Africa
Africa, East
Molecular evolution
Animal model
Vertebrata
Pisces
Genomics
Cichlidae
Speciation
Adaptation
ISSN:1471-0056, 1471-0064
On-line přístup:Získat plný text
Tagy: Přidat tag
Žádné tagy, Buďte první, kdo vytvoří štítek k tomuto záznamu!
Popis
Shrnutí:Key Points The spectacular radiation of 2,000 species of cichlid fishes in East Africa is an ideal model system and natural laboratory for studying evolutionary processes. The explosive speciation of cichlids is probably due to a combination of forces, including natural selection on ecological traits, sexual selection on male colour patterns, and possibly genetic conflicts over the sex ratio. Genomic approaches promise to unify theoretical and empirical studies by identifying the genes that are responsible for adaptive differences. An array of genomic resources has been developed for cichlids, including genetic and physical maps, and microarrays of expressed sequences. Quantitative trait mapping is identifying the genetic basis for differences in jaw and tooth shape among species. Orange-blotch, a sex-linked intraspecific colour polymorphism that features in several models of speciation, is due to a single dominant gene in a Lake Malawi cichlid. Marked variation in visual spectral sensitivity among species is due to differences in the expression of the opsin genes. The development of new model systems for the study of evolution and speciation is now practical, and will provide another window on the function of vertebrate genes. The cost of DNA sequencing continues to fall, which makes it feasible to develop genomic resources for new model species that are well suited for studying questions in evolutionary biology. The thousands of closely related cichlid fishes in the lakes of East Africa are an ideal model system for understanding the genetic basis of vertebrate speciation. Genomic techniques are helping to integrate empirical and theoretical studies by identifying the genes that underlie the phenotypic differences among species.
Bibliografie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ObjectType-Article-2
ObjectType-Feature-3
content type line 23
ObjectType-Review-1
ObjectType-Review-3
ISSN:1471-0056
1471-0064
DOI:10.1038/nrg1316