Drosophila melanogaster, Drosophila simulans, Drosophila yakuba
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA553234 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR9678420_1.fastq.gz | Fastqsanger.gz | |||
| SRR9678420_2.fastq.gz | Fastqsanger.gz | |||
| SRR9678430_1.fastq.gz | Fastqsanger.gz | |||
| SRR9678430_2.fastq.gz | Fastqsanger.gz | |||
| SRR9678440_1.fastq.gz | Fastqsanger.gz |
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Project description:Co-expression of genes that physically cluster together is a common characteristic of eukaryotic transcriptomes. Identifying these groups of co-expressed genes is important to the functional annotation of genomes and understanding the evolutionary fates of the clustered genes. We used microarrays to measure gene expression in seven closely related Drosophila species, to identify domains clusters within a species of Drosophila (D. simulans) and that are evolving among species in the D. melanogater subgroup. Experiment Overall Design: Assays were carried out on three independent (biological) replicates per species for a single line of the following five species: D.yakuba (Tuscon Stock Center Number: 14021-0261.00), D.santomea (TSCN: 14021-0271.00), D.teissieri (TSCN: 14021-0257.00), D.mauritiana (David 105, TSCN: 14021-0241.01), D.sechellia (Roberstson, TSCN: 14021-0248.21). Three biological replicates for D.melanogaster. The samples assayed for D.melanogaster reflect an even genotypic contribution of 10 isogenic lines developed from a wild population (Winters, CA) and crossed in a round-robin design.For D. simulans, three replicate arrays were used to assay each of 10 round-robin crosses between 10 isogenic lines developed from the same population. the entire data set therefore included a total of 48 independent transcript assays covering seven Drosophila species in the D.melanogaster subgroup
2008-06-16 | E-GEOD-7873 | biostudies-arrayexpress
Project description:Curration of small RNAs from four melanogaster-subgroup species (Drosophila simulans, Drosophila sechellia, Drosophila erecta, and Drosophila yakuba) for the purpose of non-coding RNA annotation and comparative genomics assessment.
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Project description:Curration of small RNAs from four melanogaster-subgroup species (Drosophila simulans, Drosophila sechellia, Drosophila erecta, and Drosophila yakuba) for the purpose of non-coding RNA annotation and comparative genomics assessment. Non-replicated small RNA samples from four melanogaster-subgroup species.
2014-07-22 | E-GEOD-56244 | biostudies-arrayexpress
Project description:As part of a larger study contrasting patterns of variation in regulatory and nonregulatory enzymes of the central metabolic pathways we have examined the molecular variation in four uncharacterized hexokinase genes unique to muscle, fat body, and testis in Drosophila melanogaster, D. simulans, and D. yakuba. Earlier isoenzyme studies had designated these genes as Hex-A, Hex-C, and Hex-t. There are two tightly linked testes-specific genes designated here as Hex-t1 and Hex-t2. Substantial and concordant differences across species are seen in levels of both amino acid and silent polymorphism. The flight muscle form Hex-A is the most conserved followed by the fat body hexokinase Hex-C and testis-specific hexokinases Hex-t1 and Hex-t2. While constraints acting at the amino acid level are expected, the silent polymorphisms follow this pattern as well. All genes are in regions of normal recombination, therefore hitchhiking and background selection are not likely causes of interlocus differences. In D. melanogaster latitudinal clines are seen for amino acid polymorphisms at the Hex-C and Hex-t2 loci. There is evidence for accelerated amino acid substitution in Hex-t1 that has lost residues known to be associated with glucose and glucose-6-phosphate binding. D. simulans shows substantial linkage phase structuring that suggests historical population subdivision.
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Project description:We have used whole genome paired-end Illumina sequence data to identify tandem duplications in 20 isofemale lines of Drosophila yakuba and 20 isofemale lines of D. simulans and performed genome wide validation with PacBio long molecule sequencing. We identify 1,415 tandem duplications that are segregating in D. yakuba as well as 975 duplications in D. simulans, indicating greater variation in D. yakuba. Additionally, we observe high rates of secondary deletions at duplicated sites, with 8% of duplicated sites in D. simulans and 17% of sites in D. yakuba modified with deletions. These secondary deletions are consistent with the action of the large loop mismatch repair system acting to remove polymorphic tandem duplication, resulting in rapid dynamics of gain and loss in duplicated alleles and a richer substrate of genetic novelty than has been previously reported. Most duplications are present in only single strains, suggesting that deleterious impacts are common. Drosophila simulans shows larger numbers of whole gene duplications in comparison to larger proportions of gene fragments in D. yakuba. Drosophila simulans displays an excess of high-frequency variants on the X chromosome, consistent with adaptive evolution through duplications on the D. simulans X or demographic forces driving duplicates to high frequency. We identify 78 chimeric genes in D. yakuba and 38 chimeric genes in D. simulans, as well as 143 cases of recruited noncoding sequence in D. yakuba and 96 in D. simulans, in agreement with rates of chimeric gene origination in D. melanogaster. Together, these results suggest that tandem duplications often result in complex variation beyond whole gene duplications that offers a rich substrate of standing variation that is likely to contribute both to detrimental phenotypes and disease, as well as to adaptive evolutionary change.
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Project description:Tandem duplications are an essential source of genetic novelty, and their variation in natural populations is expected to influence adaptive walks. Here, we describe evolutionary impacts of recently-derived, segregating tandem duplications in Drosophila yakuba and Drosophila simulans. We observe an excess of duplicated genes involved in defense against pathogens, insecticide resistance, chorion development, cuticular peptides, and lipases or endopeptidases associated with the accessory glands across both species. The observed agreement is greater than expectations on chance alone, suggesting large amounts of convergence across functional categories. We document evidence of widespread selection on the D. simulans X, suggesting adaptation through duplication is common on the X. Despite the evidence for positive selection, duplicates display an excess of low frequency variants consistent with largely detrimental impacts, limiting the variation that can effectively facilitate adaptation. Standing variation for tandem duplications spans less than 25% of the genome in D. yakuba and D. simulans, indicating that evolution will be strictly limited by mutation, even in organisms with large population sizes. Effective whole gene duplication rates are low at 1.17 × 10-9 per gene per generation in D. yakuba and 6.03 × 10-10 per gene per generation in D. simulans, suggesting long wait times for new mutations on the order of thousands of years for the establishment of sweeps. Hence, in cases where adaptation depends on individual tandem duplications, evolution will be severely limited by mutation. We observe low levels of parallel recruitment of the same duplicated gene in different species, suggesting that the span of standing variation will define evolutionary outcomes in spite of convergence across gene ontologies consistent with rapidly evolving phenotypes.
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Project description:Species of the genus Drosophila have served as favorite models in speciation studies, however genetic factors of the interspecific hybrid sterility are underinvestigated to date. Here we performed the analysis of reproductive incompatibilities of hybrid females in crossing Drosophila melanogaster females and Drosophila simulans males. Using transcriptomic data analysis, molecular, cellular and genetic approaches we analyzed differential gene expression, transposable element (TE) activity, piRNA biogenesis and functional defects of oogenesis in hybrids. A premature GSC loss was a most prominent defect of oogenesis in hybrid ovaries. Owing differential expression of genes encoding components of the piRNA pathway rhino and deadlock, functional RDCmel complex in hybrid ovaries was not assembled. At the same time the activity of RDCsim complex was maintained in hybrids, independently from the genomic origin of piRNA clusters. Despite identification of a cohort of overexpressed TEs in hybrid ovaries we found no evidences that their activity can be considered as the main cause of hybrid sterility. We revealed complex pattern of Vasa protein expression in hybrid germline, including partial AT-chX piRNA targeting of vasasim allele and significant developmental delay of vasamel expression. We came to the conclusions that complex multi-locus genetic changes between the species were responsible for hybrid sterility phenotype.
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