Erythranthe cardinalis x Erythranthe parishii
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ABSTRACT:
PROVIDER: PRJNA936857 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:Hybridization patterns reveal spatial variation in reproductive isolation between two closely related abalone species
| PRJDB42501 | ENA
Project description:Hybrid sterility is a major form of postzygotic reproductive isolation, which is a widespread phenomenon in plants. Hybrids between two subspecies of the Asian cultivated rice (Oryza sativa L.), indica and japonica, are usually highly sterile. A killer-protector system composed of three closely linked genes, ORF3, ORF4 and ORF5 at the S5 locus, has been unveiled to regulate hybrid female fertility. We performed transcriptomic analysis of wild type Balilla, sterile BalillaORF5+ (Balilla with a transformed ORF5+) and fertility-restored BalillaORF3+ORF5+ (Balilla with a transformed ORF3+ and a transformed ORF5+) at S1 (before meiosis), S2 (during meiosis) and S3 (after meiosis) respectively. By comparing the differentially expressed genes in different comparisons, we proposed a model for the mechanisms of the S5 mediated hybrid sterility.
2017-06-01 | GSE95200 | GEO
Project description:Erythranthe cardinalis Raw sequence reads
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Project description:Erythranthe cardinalis Raw sequence reads
| PRJNA684598 | ENA
Project description:Understanding the conditions that promote the evolution of reproductive isolation, and thus speciation. Here we empirically test some of the key predictions of speciation theory (Coyne 2004; Kohn 2005) by experimentally evolving the initial stages of speciation in yeast. After allowing replicate populations to adapt to two divergent environments, we observed the consistent, de novo evolution of two forms of postzygotic isolation: reduced rate of mitotic reproduction and reduced efficiency of meiotic reproduction. In general, divergent selection resulted in greater reproductive isolation than parallel selection, as predicted by ecological speciation theory. Our experimental system allowed for the first controlled comparison of the relative importance of ecological and genetic mechanisms of isolation, and the novel ability to quantify the effects of antagonistic epistasis. For mitotic reproduction, hybrid inferiority was conditional upon the selective environments and was both ecological and genetic in basis. In contrast, isolation associated with meiotic reproduction was unconditional and was caused solely by genetic mechanisms. Overall, our results show that adaption to divergent environments promotes the evolution of isolation through antagonistic epistasis, providing evidence of a plausible common avenue to speciation and adaptive radiation in nature (Schluter 2000,2001: Funk 2006) Keywords: Speciation, antagonistic epistasis, divergent adaptation
2007-06-21 | GSE6870 | GEO
Project description:Hybridization of eggs and sperm from closely related species can give rise to genetic diversity, or can lead to embryo inviability due to incompatibility. Although central to evolution, the cellular and molecular mechanisms underlying postzygotic barriers that drive reproductive isolation and speciation remain largely unknown. Species of the African Clawed frog Xenopus provide an ideal system to study hybridization and genome evolution. Xenopus laevis is an allotetraploid with 36 chromosomes that arose through interspecific hybridization of diploid progenitors, whereas Xenopus tropicalis is a diploid with 20 chromosomes that diverged from a common ancestor ~48 million years ago. Differences in genome size between the two species are accompanied by organism size differences, and size scaling of the egg and subcellular structures such as nuclei and spindles formed in egg extracts. Nevertheless, early development transcriptional programs, gene expression patterns, and protein sequences are generally conserved. Interestingly, whereas the hybrid produced when X. laevis eggs are fertilized by X. tropicalis sperm (le×ts) is viable, the reverse hybrid (te×ls) dies prior to gastrulation. Here, we applied cell biological tools and high-throughput methods to study the mechanisms underlying hybrid inviability. We reveal that two specific X. laevis chromosomes are incompatible with the X. tropicalis cytoplasm and are mis-segregated during mitosis, leading to unbalanced gene expression at the maternal to zygotic transition, followed by cell-autonomous catastrophic embryo death.
2017-11-01 | GSE106157 | GEO
Project description: Not available
| S-EPMC12717473 | biostudies-literature