Non-linear transcriptional responses to gradual modulation of transcription factor dosage
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA1080204 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR28085716_1.fastq.gz | Fastqsanger.gz | |||
| SRR28085716_2.fastq.gz | Fastqsanger.gz | |||
| SRR28085717_1.fastq.gz | Fastqsanger.gz | |||
| SRR28085717_2.fastq.gz | Fastqsanger.gz | |||
| SRR28085718_1.fastq.gz | Fastqsanger.gz |
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Project description:Genomic loci associated with common traits and diseases are typically non-coding and likely impact gene expression, sometimes coinciding with rare loss-of-function variants in the target gene. However, our understanding of how gradual changes in gene dosage affect molecular, cellular, and organismal traits is currently limited. To address this gap, we induced gradual changes in gene expression of four genes using CRISPR activation and inactivation. Downstream transcriptional consequences of dosage modulation of three master trans-regulators associated with blood cell traits (GFI1B, NFE2, and MYB) was examined using targeted single-cell multimodal sequencing. We showed that guide tiling around the TSS is the most effective way to modulate cis gene expression across a wide range of fold-changes, with further effects from chromatin accessibility and histone marks that differ between the inhibition and activation systems. Our single-cell data allowed us to precisely detect subtle to large gene expression changes in dozens of trans genes, revealing that many responses to dosage changes of these three TFs are non-linear, including non-monotonic behaviours, even when constraining the fold-changes of the master regulators to a copy number gain or loss. We found that the dosage properties are linked to gene constraint and that some of these non-linear responses are enriched for disease and GWAS genes. Overall, our study provides a straightforward and scalable method to precisely modulate gene expression and gain insights into its downstream consequences at high resolution.
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Project description:Genomic loci associated with common traits and diseases are typically non-coding and likely impact gene expression, sometimes coinciding with rare loss-of-function variants in the target gene. However, our understanding of how gradual changes in gene dosage affect molecular, cellular, and organismal traits is currently limited. To address this gap, we induced gradual changes in gene expression of four genes using CRISPR activation and inactivation. Downstream transcriptional consequences of dosage modulation of three master trans-regulators associated with blood cell traits (GFI1B, NFE2, and MYB) were examined using targeted single-cell multimodal sequencing. We showed that guide tiling around the TSS is the most effective way to modulate cis gene expression across a wide range of fold-changes, with further effects from chromatin accessibility and histone marks that differ between the inhibition and activation systems. Our single-cell data allowed us to precisely detect subtle to large gene expression changes in dozens of trans genes, revealing that many responses to dosage changes of these three TFs are non-linear, including non-monotonic behaviours, even when constraining the fold-changes of the master regulators to a copy number gain or loss. We found that the dosage properties are linked to gene constraint and that some of these non-linear responses are enriched for disease and GWAS genes. Overall, our study provides a straightforward and scalable method to precisely modulate gene expression and gain insights into its downstream consequences at high resolution.
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Project description:Amplification-mediated oncogene overexpression is a critical and widespread driver event in cancer, yet our understanding of how amplification and dosage mediate oncogene regulation is limited. Here, we find that the most significant focal amplification event in lung adenocarcinoma (LUAD) targets a lineage “super-enhancer” near the NKX2-1 lineage transcription factor. The NKX2-1 super-enhancer is targeted by focal and co-amplification with NKX2-1 and controls NKX2-1 expression and regulation. We find that NKX2-1 directly controls enhancer accessibility to drive a lineage-addicted state in LUAD. We precisely map the effects of NKX2-1 dosage modulation upon both overexpression and knockdown and identify both linear and non-linear regulation by NKX2-1 dosage. We find that NKX2-1 is a widespread dependency in LUAD cell lines and that NKX2-1 confers persistence to EGFR inhibitors. Our data suggest a defining role for dosage in the oncogenic regulation of amplified NKX2-1 and that amplified NKX2-1 lineage addiction defines LUAD tumors.
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Project description:Amplification-mediated oncogene overexpression is a critical and widespread driver event in cancer, yet our understanding of how amplification and dosage mediate oncogene regulation is limited. Here, we find that the most significant focal amplification event in lung adenocarcinoma (LUAD) targets a lineage “super-enhancer” near the NKX2-1 lineage transcription factor. The NKX2-1 super-enhancer is targeted by focal and co-amplification with NKX2-1 and controls NKX2-1 expression and regulation. We find that NKX2-1 directly controls enhancer accessibility to drive a lineage-addicted state in LUAD. We precisely map the effects of NKX2-1 dosage modulation upon both overexpression and knockdown and identify both linear and non-linear regulation by NKX2-1 dosage. We find that NKX2-1 is a widespread dependency in LUAD cell lines and that NKX2-1 confers persistence to EGFR inhibitors. Our data suggest a defining role for dosage in the oncogenic regulation of amplified NKX2-1 and that amplified NKX2-1 lineage addiction defines LUAD tumors.
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Project description:Amplification-mediated oncogene overexpression is a critical and widespread driver event in cancer, yet our understanding of how amplification and dosage mediate oncogene regulation is limited. Here, we find that the most significant focal amplification event in lung adenocarcinoma (LUAD) targets a lineage “super-enhancer” near the NKX2-1 lineage transcription factor. The NKX2-1 super-enhancer is targeted by focal and co-amplification with NKX2-1 and controls NKX2-1 expression and regulation. We find that NKX2-1 directly controls enhancer accessibility to drive a lineage-addicted state in LUAD. We precisely map the effects of NKX2-1 dosage modulation upon both overexpression and knockdown and identify both linear and non-linear regulation by NKX2-1 dosage. We find that NKX2-1 is a widespread dependency in LUAD cell lines and that NKX2-1 confers persistence to EGFR inhibitors. Our data suggest a defining role for dosage in the oncogenic regulation of amplified NKX2-1 and that amplified NKX2-1 lineage addiction defines LUAD tumors.
2025-03-25 | GSE229540 | GEO
Project description:Amplification-mediated oncogene overexpression is a critical and widespread driver event in cancer, yet our understanding of how amplification and dosage mediate oncogene regulation is limited. Here, we find that the most significant focal amplification event in lung adenocarcinoma (LUAD) targets a lineage “super-enhancer” near the NKX2-1 lineage transcription factor. The NKX2-1 super-enhancer is targeted by focal and co-amplification with NKX2-1 and controls NKX2-1 expression and regulation. We find that NKX2-1 directly controls enhancer accessibility to drive a lineage-addicted state in LUAD. We precisely map the effects of NKX2-1 dosage modulation upon both overexpression and knockdown and identify both linear and non-linear regulation by NKX2-1 dosage. We find that NKX2-1 is a widespread dependency in LUAD cell lines and that NKX2-1 confers persistence to EGFR inhibitors. Our data suggest a defining role for dosage in the oncogenic regulation of amplified NKX2-1 and that amplified NKX2-1 lineage addiction defines LUAD tumors.
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Project description:This SuperSeries is composed of the SubSeries listed below. Amplification-mediated oncogene overexpression is a critical and widespread driver event in cancer, yet our understanding of how amplification and dosage mediate oncogene regulation is limited. Here, we find that the most significant focal amplification event in lung adenocarcinoma (LUAD) targets a lineage “super-enhancer” near the NKX2-1 lineage transcription factor. The NKX2-1 super-enhancer is targeted by focal and co-amplification with NKX2-1 and controls NKX2-1 expression and regulation. We find that NKX2-1 directly controls enhancer accessibility to drive a lineage-addicted state in LUAD. We precisely map the effects of NKX2-1 dosage modulation upon both overexpression and knockdown and identify both linear and non-linear regulation by NKX2-1 dosage. We find that NKX2-1 is a widespread dependency in LUAD cell lines and that NKX2-1 confers persistence to EGFR inhibitors. Our data suggest a defining role for dosage in the oncogenic regulation of amplified NKX2-1 and that amplified NKX2-1 lineage addiction defines LUAD tumors.
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Project description:Genomic imbalance caused by varying the dosage of individual chromosomes or chromosomal segments (aneuploidy) has more detrimental effects than altering the dosage of complete chromosome sets (ploidy). Previous analysis on RNA-sequencing data of varied dosage of various chromosomal regions in maize (Zea mays) revealed global modulation of gene expression both on the varied chromosome (cis) and the remainder of the genome (trans). Dysregulation of microRNA (miRNA) dosage has been reported to have profound deleterious effects in many species. miRNAs are preferentially retained as duplicates following whole-genome duplication in grass species and are postulated to be dosage-sensitive. However, little is known regarding the role of miRNAs under genomic imbalance. We examined the impact of increased and/or decreased dosage of 1 interstitial and 19 distal chromosomal regions in concert with a whole-genome ploidy series of haploid, diploid, triploid, and tetraploid via small RNA-sequencing of diploid and haploid maize mature leaf tissue to investigate the impact of aneuploidy and polyploidy on expression of miRNAs. In general, cis miRNAs in aneuploids present a predominant gene-dosage effect, whereas trans miRNAs trend toward the inverse level, although other types of responses including dosage compensation, increased effect, and decreased effect also occur. Significant correlations between expression levels of miRNAs and their targets were identified in aneuploids, indicating the regulatory role of miRNAs on gene expression triggered by genomic imbalance. The findings provide novel insights into understanding of gene balance from the aspect of the function of miRNAs.
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