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Global allele polymorphism indicates a high rate of allele genesis at a locus under balancing selection.
Ding, Guiling; Hasselmann, Martin; Huang, Jiaxing; Roberts, John; Oldroyd, Benjamin P; Gloag, Rosalyn.
Afiliación
  • Ding G; Key Laboratory of Pollinating Insect Biology of the Ministry of Agriculture and Rural Affairs, Institute of Apicultural Research, Chinese Academy of Agricultural Sciences, Beijing, 100093, China.
  • Hasselmann M; Department of Livestock Population Genomics, Institute of Animal Science, University of Hohenheim, Stuttgart, Germany.
  • Huang J; Key Laboratory of Pollinating Insect Biology of the Ministry of Agriculture and Rural Affairs, Institute of Apicultural Research, Chinese Academy of Agricultural Sciences, Beijing, 100093, China.
  • Roberts J; Commonwealth Scientific and Industrial Research Organisation, Canberra, ACT, 2601, Australia.
  • Oldroyd BP; Behaviour, Ecology and Evolution Laboratory, School of Life and Environmental Sciences, The University of Sydney, Sydney, NSW, 2006, Australia.
  • Gloag R; Behaviour, Ecology and Evolution Laboratory, School of Life and Environmental Sciences, The University of Sydney, Sydney, NSW, 2006, Australia. ros.gloag@sydney.edu.au.
Heredity (Edinb) ; 126(1): 163-177, 2021 01.
Article en En | MEDLINE | ID: mdl-32855546
ABSTRACT
When selection favours rare alleles over common ones (balancing selection in the form of negative frequency-dependent selection), a locus may maintain a large number of alleles, each at similar frequency. To better understand how allelic richness is generated and maintained at such loci, we assessed 201 sequences of the complementary sex determiner (csd) of the Asian honeybee (Apis cerana), sampled from across its range. Honeybees are haplodiploid; hemizygotes at csd develop as males and heterozygotes as females, while homozygosity is lethal. Thus, csd is under strong negative frequency-dependent selection because rare alleles are less likely to end up in the lethal homozygous form. We find that in A. cerana, as in other Apis, just a few amino acid differences between csd alleles in the hypervariable region are sufficient to trigger female development. We then show that while allelic lineages are spread across geographical regions, allelic differentiation is high between populations, with most csd alleles (86.3%) detected in only one sample location. Furthermore, nucleotide diversity in the hypervariable region indicates an excess of recently arisen alleles, possibly associated with population expansion across Asia since the last glacial maximum. Only the newly invasive populations of the Austral-Pacific share most of their csd alleles. In all, the geographic patterns of csd diversity in A. cerana indicate that high mutation rates and balancing selection act together to produce high rates of allele genesis and turnover at the honeybee sex locus, which in turn leads to its exceptionally high local and global polymorphism.
Asunto(s)

Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Asunto principal: Selección Genética / Abejas / Procesos de Determinación del Sexo / Alelos Límite: Animals País/Región como asunto: Asia Idioma: En Revista: Heredity (Edinb) Año: 2021 Tipo del documento: Article País de afiliación: China

Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Asunto principal: Selección Genética / Abejas / Procesos de Determinación del Sexo / Alelos Límite: Animals País/Región como asunto: Asia Idioma: En Revista: Heredity (Edinb) Año: 2021 Tipo del documento: Article País de afiliación: China