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High-resolution mapping reveals hundreds of genetic incompatibilities in hybridizing fish species.

ABSTRACT: Hybridization is increasingly being recognized as a common process in both animal and plant species. Negative epistatic interactions between genes from different parental genomes decrease the fitness of hybrids and can limit gene flow between species. However, little is known about the number and genome-wide distribution of genetic incompatibilities separating species. To detect interacting genes, we perform a high-resolution genome scan for linkage disequilibrium between unlinked genomic regions in naturally occurring hybrid populations of swordtail fish. We estimate that hundreds of pairs of genomic regions contribute to reproductive isolation between these species, despite them being recently diverged. Many of these incompatibilities are likely the result of natural or sexual selection on hybrids, since intrinsic isolation is known to be weak. Patterns of genomic divergence at these regions imply that genetic incompatibilities play a significant role in limiting gene flow even in young species.

SUBMITTER: Schumer M

PROVIDER: S-EPMC4080447 | biostudies-literature | 2014 Jun

REPOSITORIES: biostudies-literature

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High-resolution mapping reveals hundreds of genetic incompatibilities in hybridizing fish species.

Schumer Molly M Cui Rongfeng R Powell Daniel L DL Dresner Rebecca R Rosenthal Gil G GG Andolfatto Peter P

eLife 20140604

Hybridization is increasingly being recognized as a common process in both animal and plant species. Negative epistatic interactions between genes from different parental genomes decrease the fitness of hybrids and can limit gene flow between species. However, little is known about the number and genome-wide distribution of genetic incompatibilities separating species. To detect interacting genes, we perform a high-resolution genome scan for linkage disequilibrium between unlinked genomic region ...[more]

PMID: 24898754

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Project description:Genome-wide mapping of nucleosomes has revealed a great deal about the relationships between chromatin structure and control of gene expression, and has led to mechanistic hypotheses regarding the rules by which chromatin structure is established. High-throughput sequencing has recently become the technology of choice for chromatin mapping studies, yet analysis of these experiments is still in its infancy. Here, we introduce a pipeline for analyzing deep sequencing maps of chromatin structure and apply it to data from S. cerevisiae. We analyze digestion series where nucleosomes are isolated from under- and over-digested chromatin. We find that certain classes of nucleosomes are unusually susceptible or resistant to overdigestion, with promoter nucleosomes easily digested and mid-coding region nucleosomes being quite stable. We find evidence for highly sensitive nucleosomes located within “nucleosome-free regions,” suggesting that these regions are not always completely naked but instead are likely associated with easily-digested nucleosomes. Finally, since RNA polymerase is the dominant energy-consuming machine that operates on the chromatin template, we analyze changes in chromatin structure when RNA polymerase is inactivated via a temperature-sensitive mutation. We find evidence that RNA polymerase plays a role in nucleosome eviction at promoters, and is also responsible for retrograde shifts in nucleosomes during transcription. Loss of RNA polymerase results in a relaxation of chromatin structure to more closely match in vitro nucleosome positioning preferences. Together, these results provide analytical tools and experimental guidance for nucleosome mapping experiments, and help disentangle the interlinked processes of transcription and chromatin packaging. Keywords: Genomic Solexa/Illumina sequencing of mononucleosomes. Titration series: gel-purified mononucleosomal DNA from three different titration levels – underdigested, typical digestion, and overdigested. RP021 series: MNase-seq at 0, 20, and 120 minutes after shifting these cells from 25 C to 37 C.

Dataset Information

High-resolution mapping reveals hundreds of genetic incompatibilities in hybridizing fish species.

Publications

High-resolution mapping reveals hundreds of genetic incompatibilities in hybridizing fish species.

Similar Datasets

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