Abstract:
:Regulatory variants are often context specific, modulating gene expression in a subset of possible cellular states. Although these genetic effects can play important roles in disease, the molecular mechanisms underlying context specificity are poorly understood. Here, we identified shared quantitative trait loci (QTLs) for chromatin accessibility and gene expression in human macrophages exposed to IFNγ, Salmonella and IFNγ plus Salmonella. We observed that ~60% of stimulus-specific expression QTLs with a detectable effect on chromatin altered the chromatin accessibility in naive cells, thus suggesting that they perturb enhancer priming. Such variants probably influence binding of cell-type-specific transcription factors, such as PU.1, which can then indirectly alter the binding of stimulus-specific transcription factors, such as NF-κB or STAT2. Thus, although chromatin accessibility assays are powerful for fine-mapping causal regulatory variants, detecting their downstream effects on gene expression will be challenging, requiring profiling of large numbers of stimulated cellular states and time points.
journal_name
Nat Genetjournal_title
Nature geneticsauthors
Alasoo K,Rodrigues J,Mukhopadhyay S,Knights AJ,Mann AL,Kundu K,HIPSCI Consortium.,Hale C,Dougan G,Gaffney DJdoi
10.1038/s41588-018-0046-7subject
Has Abstractpub_date
2018-03-01 00:00:00pages
424-431issue
3eissn
1061-4036issn
1546-1718pii
10.1038/s41588-018-0046-7journal_volume
50pub_type
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