Assessing population differentiation and isolation from single-nucleotide polymorphism data

We introduce a new, hierarchical, model for single-nucleotide polymorphism allele frequencies in a structured population, which is naturally fitted via Markov chain Monte Carlo methods. There is one parameter for each population, closely analogous to a population-specific version of Wright's FS...

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Veröffentlicht in:	Journal of the Royal Statistical Society. Series B, Statistical methodology Jg. 64; H. 4; S. 695 - 715
Hauptverfasser:	Nicholson, George, Smith, Albert V., Jónsson, Frosti, Gústafsson, Ómar, Stefánsson, Kári, Donnelly, Peter
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	Oxford, UK Blackwell Publishers 01.10.2002 Blackwell Royal Statistical Society
Schriftenreihe:	Journal of the Royal Statistical Society Series B
Schlagworte:	Bayes estimators Biological and medical sciences Bottleneck Chromosomes Coalescent Datasets Demography Estimation Estimators Exact sciences and technology Fixation indices Forensic genetics France Fundamental and applied biological sciences. Psychology Gene frequency General aspects Genetic loci Human genetics Iceland Inference from stochastic processes; time series analysis Markov chain Monte Carlo methods Markov processes Markovian processes Mathematics Mathematics in biology. Statistical analysis. Models. Metrology. Data processing in biology (general aspects) Monte Carlo simulation Population Population genetics Population histories Population parameters Probability and statistics Probability theory and stochastic processes Sciences and techniques of general use Statistical methods Statistical models Statistics Sufficiency and information U.S.A Utah United States Europe America France North America Atlantic Ocean Islands Iceland Utah Human Bottleneck Stochastic model Monte Carlo method Parameter estimation Demography Index History Population genetics Markov chain Statistical method Fixation Wright Fisher diffusion Genetics Hierarchical model Population dynamics Diffusion Differentiation Fixation index Population history
ISSN:	1369-7412, 1467-9868
Online-Zugang:	Volltext
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Beschreibung
Zusammenfassung:	We introduce a new, hierarchical, model for single-nucleotide polymorphism allele frequencies in a structured population, which is naturally fitted via Markov chain Monte Carlo methods. There is one parameter for each population, closely analogous to a population-specific version of Wright's FST, which can be interpreted as measuring how isolated the relevant population has been. Our model includes the effects of single-nucleotide polymorphism ascertainment and is motivated by population genetics considerations, explicitly in the transient setting after divergence of populations, rather than as the equilibrium of a stochastic model, as is traditionally the case. For the sizes of data set that we consider the method provides good parameter estimates and considerably outperforms estimation methods analogous to those currently used in practice. We apply the method to one new and one existing human data set, each with rather different characteristics-the first consisting of three rather close European populations; the second of four populations taken from across the globe. A novelty of our framework is that the fit of the underlying model can be assessed easily, and these results are encouraging for both data sets analysed. Our analysis suggests that Iceland is more differentiated than the other two European populations (France and Utah), a finding which is consistent with the historical record, but not obvious from comparisons of simple summary statistics.
Bibliographie:	istex:C016FA08358780794850850CEA1DEF452699E51C ark:/67375/WNG-DW0NR729-5 ArticleID:RSSB357 ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	1369-7412 1467-9868
DOI:	10.1111/1467-9868.00357