Variations in genome size between wild and domesticated lineages of fowls belonging to the Gallus gallus species.
Genomics
; 112(2): 1660-1673, 2020 03.
Article
em En
| MEDLINE
| ID: mdl-31669705
ABSTRACT
Efforts to elucidate the causes of biological differences between wild fowls and their domesticated relatives, the chicken, have to date mainly focused on the identification of single nucleotide mutations. Other types of genomic variations have however been demonstrated to be important in avian evolution and associated to variations in phenotype. They include several types of sequences duplicated in tandem that can vary in their repetition number. Here we report on genome size differences between the red jungle fowl and several domestic chicken breeds and selected lines. Sequences duplicated in tandem such as rDNA, telomere repeats, satellite DNA and segmental duplications were found to have been significantly re-shaped during domestication and subsequently by human-mediated selection. We discuss the extent to which changes in genome organization that occurred during domestication agree with the hypothesis that domesticated animal genomes have been shaped by evolutionary forces aiming to adapt them to anthropized environments.
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Base de dados:
MEDLINE
Assunto principal:
Polimorfismo Genético
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Cruzamento
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Galinhas
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Tamanho do Genoma
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Domesticação
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article