Heliconius
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ABSTRACT:
PROVIDER: PRJNA966943 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:Evolution of novel mimicry rings facilitated by adaptive introgression in tropical butterflies
| PRJEB21091 | ENA
Project description:Background: Heliconius butterflies are an excellent model system for studies of adaptive convergent and divergent phenotypic traits. Wing colour patterns are used as signals to both predators and potential mates and are inherited in a Mendelian manner. The underlying genetic mechanisms of pattern formation have been studied for many years and shed light on broad issues, such as the repeatability of evolution. In Heliconius melpomene, the yellow hindwing bar is controlled by the HmYb locus and several genes in this region show expression pattern differences across races. MicroRNAs (miRNAs) are important post-transcriptional regulators of gene expression that have key roles in many biological processes, including development. It seems likely that miRNAs could act as downstream regulators of genes involved in wing development, patterning and pigmentation. For this reason we characterised miRNAs in developing butterfly wings and examined differences in their expression between colour pattern races. Results: We sequenced small RNA libraries from two colour pattern races and detected 142 Heliconius miRNAs with homology to others found in miRBase. Several highly abundant miRNAs appeared to be differentially expressed between colour pattern races and this was tested further in different developing pupal wing stages using Northern blots. These revealed that differences in expression were due to developmental stage rather than colour pattern. Assembly of sequenced reads to the HmYb region identified miR-193 and miR-2788; located 2380bp apart in an intergenic region. A search for miRNAs in all available H. melpomene BAC sequences (~2.5Mb) did not reveal any other miRNA genes and no novel miRNAs were predicted. There were several regions where other small RNA sequences assembled to the HmYb region and appeared to be differentially expressed.These might represent other regulatory RNAs. Conclusions: Here we describe the first butterfly miRNAs and characterise their expression in developing wings. Some show differences in expression across developing pupal stages. Two miRNAs were located in the HmYb region. Future work will examine the expression of these miRNAs in different colour pattern races and identify miRNA targets among wing patterning genes.
2011-06-02 | GSE23292 | GEO
Project description:Classic and introgressed selective sweeps shape mimicry loci across a butterfly adaptive radiation
| PRJEB33224 | ENA
Project description:We test the hypothesis that intraspecific genomic divergence is linked to regulatory variation between Heliconius butterfly populations. We show that population-level divergence in chromatin accessibility and regulatory activity during wing development is abundant, and that differences in regulatory activity between populations are strongly associated with developmental stage. Genomic regions with high Fst are highly enriched for regulatory variants, and enrichment patterns vary significantly across development. Regulatory variants are associated with most differential gene expression between populations, and our data point to two roles for histone modifications in the evolution of gene expression.
2019-02-05 | GSE105080 | GEO
Project description:We test the hypothesis that intraspecific genomic divergence is linked to regulatory variation between Heliconius butterfly populations. We show that population-level divergence in chromatin accessibility and regulatory activity during wing development is abundant, and that differences in regulatory activity between populations are strongly associated with developmental stage. Genomic regions with high Fst are highly enriched for regulatory variants, and enrichment patterns vary significantly across development. Regulatory variants are associated with most differential gene expression between populations, and our data point to two roles for histone modifications in the evolution of gene expression.
2019-02-05 | GSE109889 | GEO
Project description:Aposematic color pattern mimicry in Heliconius butterflies provides a well-known example of adaptation via selection on a few genes of large effect. To understand how selection at individual genes can drive the evolution of complex traits, we functionally characterized five novel enhancers of the color pattern gene, optix. In Heliconius erato we found that wing pattern enhancers are largely ancestral, pleiotropic, functionally interdependent, and introgressed between populations. Remarkably, many of these enhancers are also associated with regional pattern variation in the distantly related co-mimics Heliconius melpomene and Heliconius timareta. Our findings provide a case study of how parallel co-evolution of ancient, multifunctional regulatory elements can facilitate the rapid diversification of complex phenotypes, and provide a counterpoint to many widespread assumptions of cis-regulatory evolution.
2021-06-04 | GSE123701 | GEO
Project description:Aposematic color pattern mimicry in Heliconius butterflies provides a well-known example of adaptation via selection on a few genes of large effect. To understand how selection at individual genes can drive the evolution of complex traits, we functionally characterized five novel enhancers of the color pattern gene, optix. In Heliconius erato we found that wing pattern enhancers are largely ancestral, pleiotropic, functionally interdependent, and introgressed between populations. Remarkably, many of these enhancers are also associated with regional pattern variation in the distantly related co-mimics Heliconius melpomene and Heliconius timareta. Our findings provide a case study of how parallel co-evolution of ancient, multifunctional regulatory elements can facilitate the rapid diversification of complex phenotypes, and provide a counterpoint to many widespread assumptions of cis-regulatory evolution.
2021-06-04 | GSE123700 | GEO
Project description:Gene duplications can facilitate adaptation and may lead to interpopulation divergence, causing reproductive isolation. We used whole-genome resequencing data from 34 butterflies to detect duplications in two Heliconius species, Heliconius cydno and Heliconius melpomene. Taking advantage of three distinctive signals of duplication in short-read sequencing data, we identified 744 duplicated loci in H. cydno and H. melpomene and evaluated the accuracy of our approach using single-molecule sequencing. We have found that duplications overlap genes significantly less than expected at random in H. melpomene, consistent with the action of background selection against duplicates in functional regions of the genome. Duplicate loci that are highly differentiated between H. melpomene and H. cydno map to four different chromosomes. Four duplications were identified with a strong signal of divergent selection, including an odorant binding protein and another in close proximity with a known wing colour pattern locus that differs between the two species.
| S-EPMC5176112 | biostudies-literature
Project description:We test the hypothesis that intraspecific genomic divergence is linked to regulatory variation between Heliconius butterfly populations. We show that population-level divergence in chromatin accessibility and regulatory activity during wing development is abundant, and that differences in regulatory activity between populations are strongly associated with developmental stage. Genomic regions with high Fst are highly enriched for regulatory variants, and enrichment patterns vary significantly across development. Regulatory variants are associated with most differential gene expression between populations, and our data point to two roles for histone modifications in the evolution of gene expression.
2019-02-05 | GSE111022 | GEO