Origin and consequences of chromosomal inversions in the virilis group of Drosophila
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PROVIDER: PRJEB27094 | ENA |
REPOSITORIES: ENA
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Project description:In Drosophila, large variations in rearrangement rate have been reported among different lineages and among Muller's elements. Nevertheless, the mechanisms that are involved in the generation of inversions, their increase in frequency, as well as their impact on the genome are not completely understood. This is in part due to the lack of comparative studies on species distantly related to Drosophila melanogaster. Therefore, we sequenced and assembled the genomes of two species of the virilis phylad (Drosophila novamexicana [15010-1031.00] and Drosophila americana [SF12]), which are diverging from D. melanogaster for more than 40 Myr. Based on these data, we identified the precise location of six novel inversion breakpoints. A molecular characterization provided clear evidence that DAIBAM (a miniature inverted-repeat transposable element) was involved in the generation of eight out of the nine inversions identified. In contrast to what has been previously reported for D. melanogaster and close relatives, ectopic recombination is thus the prevalent mechanism of generating inversions in species of the virilis phylad. Using pool-sequencing data for three populations of D. americana, we also show that common polymorphic inversions create a high degree of genetic differentiation between populations for chromosomes X, 4, and 5 over large physical distances. We did not find statistically significant differences in expression levels between D. americana (SF12) and D. novamexicana (15010-1031.00) strains for the three genes surveyed (CG9588, Fig 4, and fab1) flanking three inversion breakpoints.
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Project description:Eukaryotic DNA replication is regulated by conserved mechanisms that bring about a spatial and temporal organization in which distinct genomic domains are copied at characteristic times during S phase. Although this replication program has been closely linked with genome architecture, we still do not understand key aspects of how chromosomal context modulates the activity of replication origins. To address this question, we have exploited models that combine engineered genomic rearrangements with the unique replication programs of post-quiescence and pre-meiotic S phases. Our results demonstrate that large-scale inversions surprisingly do not affect cell proliferation and meiotic progression, despite inducing a restructuring of replication domains on each rearranged chromosome. Remarkably, these alterations in the organization of DNA replication are entirely due to changes in the positions of existing origins along the chromosome, as their efficiencies remain virtually unaffected genome wide. However, we identified striking alterations in origin firing proximal to the fusion points of each inversion, suggesting that the immediate chromosomal neighborhood of an origin is a crucial determinant of its activity. Interestingly, the impact of genome reorganization on replication initiation is highly comparable in the post-quiescent and pre-meiotic S phases, despite the differences in DNA metabolism in these two physiological states. Our findings therefore shed new light on how origin selection and the replication program are governed by chromosomal architecture. Genes 2022, 13(7), 1244; https://doi.org/10.3390/genes13071244
2022-08-12 | GSE210821 | GEO
Project description:Chromosomal inversions play a fundamental role in evolution and have been shown to be responsible for the epidemiologically important traits in malaria mosquitoes. However, they have never been characterized in the major vector of arboviruses Aedes aegypti because of the poor structure of its polytene chromosomes. In this study, we applied a Hi-C proximity ligation approach to identify chromosomal inversions in 23 recently collected strains of Ae. aegypti from its worldwide distribution, two old laboratory colonies, and Ae. mascarensis.
2024-09-06 | GSE243024 | GEO
Project description:Evaluation of the impact of chromosomal inversions on replication origin usage in fission yeast
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Project description:We have comprehensively explored the origin utilisation in Haloferax mediterranei. Here we report three active chromosomal origins by genome-wide replication profiling, and demonstrate that when these three origins are deleted, a dormant origin becomes activated.
2015-07-08 | GSE70597 | GEO
Project description:Gene annoation and determination of gene expression levels in Drosophila virilis and Drosophila yakuba by deep sequencing.
2015-01-29 | GSE61222 | GEO
Project description:We have comprehensively explored the origin utilisation in Haloferax mediterranei. Here we report three active chromosomal origins by genome-wide replication profiling, and demonstrate that when these three origins are deleted, a dormant origin becomes activated. Genomic DNA was extracted from the H. mediterranei cultures at specific time points(12h,18h,24h,36h,42h and stationary phase 66h), or during the exponential phase (OD600≈0.5) and stationary phase (OD600≈4.0)for the origin deletion strains. After being lablled, Genomic DNA from exponential phase and stationary phase were hybridized to Haloferax mediterranei genome array genechips.
2015-07-08 | E-GEOD-70597 | biostudies-arrayexpress