Spectrum of genetic diversity and networks of clonal organisms

Journal of the Royal Society Interface - Tập 4 Số 17 - Trang 1093-1102 - 2007
Alejandro Rozenfeld1, Sophie Arnaud‐Haond2, Emilio Hernández‐García1, Vı́ctor M. Eguı́luz1, Manuel A. Matı́as1, Ester Á. Serrão2, Carlos M. Duarte3
1Cross-Disciplinary Physics Department, IMEDEA (CSIC-UIB), Instituto Mediterráneo de Estudios Avanzados, Campus Universitat de les Illes Balears07122 Palma de Mallorca, Spain
2CCMAR, CIMAR-Laboratório Associado, Universidade do AlgarveGambelas, 8005-139 Faro, Portugal
3Natural Resources Department, IMEDEA (CSIC-UIB), Instituto Mediterráneo de Estudios AvanzadosC/Miquel Marques 21, 07190 Esporles, Mallorca, Spain

Tóm tắt

Clonal reproduction characterizes a wide range of species including clonal plants in terrestrial and aquatic ecosystems, and clonal microbes such as bacteria and parasitic protozoa, with a key role in human health and ecosystem processes. Clonal organisms present a particular challenge in population genetics because, in addition to the possible existence of replicates of the same genotype in a given sample, some of the hypotheses and concepts underlying classical population genetics models are irreconcilable with clonality. The genetic structure and diversity of clonal populations were examined using a combination of new tools to analyse microsatellite data in the marine angiospermPosidonia oceanica. These tools were based on examination of the frequency distribution of the genetic distance among ramets, termed the spectrum of genetic diversity (GDS), and of networks built on the basis of pairwise genetic distances among genets. Clonal growth and outcrossing are apparently dominant processes, whereas selfing and somatic mutations appear to be marginal, and the contribution of immigration seems to play a small role in adding genetic diversity to populations. The properties and topology of networks based on genetic distances showed a ‘small-world’ topology, characterized by a high degree of connectivity among nodes, and a substantial amount of substructure, revealing organization in subfamilies of closely related individuals. The combination of GDS and network tools proposed here helped in dissecting the influence of various evolutionary processes in shaping the intra-population genetic structure of the clonal organism investigated; these therefore represent promising analytical tools in population genetics.

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Journal of the Royal Society Interface

Tập 4 Số 17

1093-1102

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