Multi-locus analysis of genomic time series data from experimental evolution.
Genomic time series data generated by evolve-and-resequence (E&R) experiments offer a powerful window into the mechanisms that drive evolution. However, standard population genetic inference procedures do not account for sampling serially over time, and new methods are needed to make full use of...
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2015-04-01
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| Series: | PLoS Genetics |
| Online Access: | https://doi.org/10.1371/journal.pgen.1005069 |
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| _version_ | 1850161719813341184 |
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| author | Jonathan Terhorst Christian Schlötterer Yun S Song |
| author_facet | Jonathan Terhorst Christian Schlötterer Yun S Song |
| author_sort | Jonathan Terhorst |
| collection | DOAJ |
| description | Genomic time series data generated by evolve-and-resequence (E&R) experiments offer a powerful window into the mechanisms that drive evolution. However, standard population genetic inference procedures do not account for sampling serially over time, and new methods are needed to make full use of modern experimental evolution data. To address this problem, we develop a Gaussian process approximation to the multi-locus Wright-Fisher process with selection over a time course of tens of generations. The mean and covariance structure of the Gaussian process are obtained by computing the corresponding moments in discrete-time Wright-Fisher models conditioned on the presence of a linked selected site. This enables our method to account for the effects of linkage and selection, both along the genome and across sampled time points, in an approximate but principled manner. We first use simulated data to demonstrate the power of our method to correctly detect, locate and estimate the fitness of a selected allele from among several linked sites. We study how this power changes for different values of selection strength, initial haplotypic diversity, population size, sampling frequency, experimental duration, number of replicates, and sequencing coverage depth. In addition to providing quantitative estimates of selection parameters from experimental evolution data, our model can be used by practitioners to design E&R experiments with requisite power. We also explore how our likelihood-based approach can be used to infer other model parameters, including effective population size and recombination rate. Then, we apply our method to analyze genome-wide data from a real E&R experiment designed to study the adaptation of D. melanogaster to a new laboratory environment with alternating cold and hot temperatures. |
| format | Article |
| id | doaj-art-b33cb61bfc604026a6a3a2b0091ba404 |
| institution | OA Journals |
| issn | 1553-7390 1553-7404 |
| language | English |
| publishDate | 2015-04-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS Genetics |
| spelling | doaj-art-b33cb61bfc604026a6a3a2b0091ba4042025-08-20T02:22:45ZengPublic Library of Science (PLoS)PLoS Genetics1553-73901553-74042015-04-01114e100506910.1371/journal.pgen.1005069Multi-locus analysis of genomic time series data from experimental evolution.Jonathan TerhorstChristian SchlöttererYun S SongGenomic time series data generated by evolve-and-resequence (E&R) experiments offer a powerful window into the mechanisms that drive evolution. However, standard population genetic inference procedures do not account for sampling serially over time, and new methods are needed to make full use of modern experimental evolution data. To address this problem, we develop a Gaussian process approximation to the multi-locus Wright-Fisher process with selection over a time course of tens of generations. The mean and covariance structure of the Gaussian process are obtained by computing the corresponding moments in discrete-time Wright-Fisher models conditioned on the presence of a linked selected site. This enables our method to account for the effects of linkage and selection, both along the genome and across sampled time points, in an approximate but principled manner. We first use simulated data to demonstrate the power of our method to correctly detect, locate and estimate the fitness of a selected allele from among several linked sites. We study how this power changes for different values of selection strength, initial haplotypic diversity, population size, sampling frequency, experimental duration, number of replicates, and sequencing coverage depth. In addition to providing quantitative estimates of selection parameters from experimental evolution data, our model can be used by practitioners to design E&R experiments with requisite power. We also explore how our likelihood-based approach can be used to infer other model parameters, including effective population size and recombination rate. Then, we apply our method to analyze genome-wide data from a real E&R experiment designed to study the adaptation of D. melanogaster to a new laboratory environment with alternating cold and hot temperatures.https://doi.org/10.1371/journal.pgen.1005069 |
| spellingShingle | Jonathan Terhorst Christian Schlötterer Yun S Song Multi-locus analysis of genomic time series data from experimental evolution. PLoS Genetics |
| title | Multi-locus analysis of genomic time series data from experimental evolution. |
| title_full | Multi-locus analysis of genomic time series data from experimental evolution. |
| title_fullStr | Multi-locus analysis of genomic time series data from experimental evolution. |
| title_full_unstemmed | Multi-locus analysis of genomic time series data from experimental evolution. |
| title_short | Multi-locus analysis of genomic time series data from experimental evolution. |
| title_sort | multi locus analysis of genomic time series data from experimental evolution |
| url | https://doi.org/10.1371/journal.pgen.1005069 |
| work_keys_str_mv | AT jonathanterhorst multilocusanalysisofgenomictimeseriesdatafromexperimentalevolution AT christianschlotterer multilocusanalysisofgenomictimeseriesdatafromexperimentalevolution AT yunssong multilocusanalysisofgenomictimeseriesdatafromexperimentalevolution |