Ontology highlight
ABSTRACT:
PROVIDER: PRJNA612154 | ENA |
REPOSITORIES: ENA
Similar Datasets
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Project description:Here, we present the results of an integrative study that leverages naturally segregating variation and a recent, adaptive divergence event affecting seasonal timing to identify developmental mechanisms underlying diapause progression in a tephritid fly, Rhagoletis pomonella. Also called the apple maggot fly, R. pomonella is native to North America, where it infests fruits of native Crataegus (hawthorn) species throughout its range. Derived populations of the fly infest apples (Malus domesticus), and thus have evolved in the last ~250 years since apples were introduced. Many molecular studies in conjunction with mark-recapture experiments document that the populations, or host races, remain genetically distinct despite ongoing gene flow, making R. pomonella a textbook example of incipient speciation with gene flow and host associated divergence. Strong natural selection on two primary traits, host finding behavior and seasonal timing, maintain genetic divergence. Both populations (hereafter apple and haw flies) have one generation per year, with a functionally obligate pupal diapause, overwintering in the soil. Adults must emerge coincident with host fruit availability, typically a period of only a few weeks, in order to successfully oviposit into fruits. Apple flies have evolved an earlier (~3 week) emergence timing to synchronize with apples, which fruit about 3 weeks earlier than hawthorn at a typical, sympatric site in the Midwest (e.g., Michigan or Illinois, USA). We combined RNA sequencing (RNAseq), phenotyping of emergence timing and brain morphology, and whole genome pooled resequencing (Poolseq) to infer mechanisms underlying segregating variation for diapause phenology in each Rhagoletic pomonella host race, and the evolved difference in phenology between host races.
2020-08-19 | GSE140473 | GEO
Project description:Optimize SNP genotyping probes and demonstrate a new P. falciparum microarray platform that includes CGH and resequencing probes on the same chip
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Project description:<p>The purpose of this study is to ascertain the locations of somatic LINE-1 retrotransposition events in human colon tumor samples by pooling multiple tumor samples from different patients and performing a targeted resequencing assay (Ewing and Kazazian, Genome Research 2010) to sequence the 3' flanking regions of all insertions in the pooled sample. The result is compared to the result of applying the same method to pooled normal samples from the same patients as were used in the pooled tumor sample and selecting sites that show an insertion in the tumor but not in the normaltissue and do not correspond to any known non-reference LINE-1 insertion allele. The selected sites are then validated by site-specific PCR and capillary sequencing to confirm that they represent LINE-1 insertions and to obtain breakpoint sequences.</p>
| phs000536 | dbGaP
Project description:Here we present a statistically rigorous approach to quantifying microarray expression data that allows the relative effects of multiple classes of treatment to be compared and incorporates analytical methods that are common to quantitative genetics. From the magnitude of gene effects and contributions of variance components, we find that gene expression in adult flies is affected most strongly by sex, less so by genotype and only weakly by age (for 1- and 6-wk flies); in addition, sex-genotype interactions may be present for as much as 10% of the Drosophila transcriptome. This interpretation is compromised to some extent by statistical issues relating to power and experimental design. Nevertheless, we show that changes in expression as small as 1.2 fold can be highly significant. Genotypic contributions to transcriptional variance may be of a similar magnitude to those relating to some quantitative phenotypes and should be considered when assessing the significance of experimental treatments. The experimental design consisted of 24 cDNA microarrays, 6 for each combination of 2 genotypes (Oregon R and Samarkand) and the 2 sexes, involving 48 separate labeling reactions. We directly contrasted two time points, 1-wk and 6-wk adult flies, on each microarray. The dyes Cy3 and Cy5 were flipped for two of the six replicates of each genotype and sex combination. A common reference sample was not used. In total, we spotted 4,256 clones, representing a third of the genome, two-thirds of which were verified by resequencing before printing. We excluded 325 clones from the analysis because no consistent expression above background was detected.
2008-12-16 | E-GEOD-13928 | biostudies-arrayexpress
Project description:Illumina human Omni5Exome arrays were used to investigate CNVs in Sѐzary syndrome tumours as part of a larger study involving whole exome sequencing of the same samples and targeted resequencing of a further cohort.
2016-07-22 | GSE80650 | GEO