Quantitative profiling of BATF family proteins/JUNB/IRF hetero-trimers using Spec-seq
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ABSTRACT:
ORGANISM(S): synthetic construct
PROVIDER: GSE102219 | GEO | 2017/10/11
SECONDARY ACCESSION(S): PRJNA397060
REPOSITORIES: GEO
Similar Datasets
Project description:BackgroundBATF family transcription factors (BATF, BATF2 and BATF3) form hetero-trimers with JUNB and either IRF4 or IRF8 to regulate cell fate in T cells and dendritic cells in vivo. While each combination of the hetero-trimer has a distinct role, some degree of cross-compensation was observed. The basis for the differential actions of IRF4 and IRF8 with BATF factors and JUNB is still unknown. We propose that the differences in function between these hetero-trimers may be caused by differences in their DNA binding preferences. While all three BATF family transcription factors have similar binding preferences when binding as a hetero-dimer with JUNB, the cooperative binding of IRF4 or IRF8 to the hetero-dimer/DNA complex could change the preferences. We used Spec-seq, which allows for the efficient and accurate determination of relative affinity to a large collection of sequences in parallel, to find differences between cooperative DNA binding of IRF4, IRF8 and BATF family members.ResultsWe found that without IRF binding, all three hetero-dimer pairs exhibit nearly the same binding preferences to both expected wildtype binding sites TRE (TGA(C/G)TCA) and CRE (TGACGTCA). IRF4 and IRF8 show the very similar DNA binding preferences when binding with any of the three hetero-dimers. No major change of binding preferences was found in the half-sites between different hetero-trimers. IRF proteins bind with substantially lower affinity with either a single nucleotide spacer between IRF and BATF binding site or with an alternative mode of binding in the opposite orientation. In addition, the preference to CRE binding site was reduced with either IRF binding in all BATF-JUNB combinations.ConclusionsThe specificities of BATF, BATF2 and BATF3 are all very similar as are their interactions with IRF4 and IRF8. IRF proteins binding adjacent to BATF sites increases affinity substantially compared to sequences with spacings between the sites, indicating cooperative binding through protein-protein interactions. The preference for the type of BATF binding site, TRE or CRE, is also altered when IRF proteins bind. These in vitro preferences aid in the understanding of in vivo binding activities.
| S-EPMC5869772 | biostudies-literature
Project description:Cooperative binding of transcription factors is known to be important in the regulation of many promoters and enhancers, but current methods to measure cooperativity parameters have been laborious and therefore limited to studying only a few sequence variants at a time. Coop-seq (cooperativity by sequencing) is capable of efficiently and accurately determining the cooperativity parameters for hundreds of different DNA sequences in a single experiment, which we demonstrate using members of the Sox and POU families of transcription factors. Spec-seq directly measures specificity by sequencing. We run an EMSA experiment on TF of interest with a library of DNA targets. Then we extract and sequence the bound and unbound portion of the DNA separately. Finally we count the occurences of each variant in the library and calculate the ratio and the relative binding energy.
2016-12-05 | GSE85122 | GEO
Project description:In this work, we used our recently developed method Spec-seq to characterize the binding specificity of Glucocorticoid receptor in vitro. This GR Spec-seq experiment has been run twice separately (Dec 2014 and Mar 2015) with different library compositions. The basic workflow is the same as our previous work for lac repressor published in Genetics 198.3 (2014): 1329-1343. Recombinant human GR protein was used to facilitate in vitro DNA-binding and separation experiments. Bound and Unbound DNA fragments were separated in EMSA gels, purified, barcoded for further Illumina sequencing. An initial experiment was performed using the putative consensus sequence: AGAACA GGG TGTTCT; randomized library 1: AGAACN NSN NGTTCT [diversity =512]; randomized library 2: AGAANN GGG NNNTCT [diversity = 1024]; randomized library 3: AGAACA GGG TGNNNN [diversity =256]; randomized library 4: AGAACA GGGC NNNTCT [diversity = 64]. The initial total library diversity was ~1853 with a library composition of 10% positive control sequence + randomized libraries 1-4 + 5% negative control sequence. A 5th library containing 2304 sequences based on DDNACW KKN KGTTCT, where D="not C", N="any base", W="A or T" and K="G or T" was subsequently prepared and analyzed using similar ratios of control sequences. Binding conditions for EMSA were 100ng FAM-labelled dsDNA+ 0/0.5/1/2/4uM GR DBD protein for each lane, 1X NEB buffer 4. GR DBD was prepared as previously described. The EMSA was performed using a 9% 33:1 acrylamide gel and TB buffer, and was run at 200V for 30mins @ 0 degrees C. The 2uM protein lane used for final sequencing. Bound/unbound fractions resulting from EMSA of these libraries and conditions were used to generate PWMs as described. The GR PWM that was generated through this analysis was used to define relative binding energies using the patser program (35), which can be accessed online at (http://stormo.wustl.edu/consensus/cgi-bin/Server/Interface/patser.cgi ). Derived binding affinities are proportional to the inverse of the natural log of the calculated energies.
2015-07-01 | E-GEOD-69386 | biostudies-arrayexpress
Project description:This series is an updated dataset consisting of the Spec-seq and Methyl-Spec-seq samples for human CTCF with a bigger sequencing libraries and different epigenetic modifications. Each sample has replicate to gurantee the reproducibility for each measurement.
2021-11-06 | GSE188164 | GEO
Project description:We developed a novel in-vitro experimental method to characterize the protein-DNA interaction specificity and methylation sensitivity, we called Methyl-Spec-seq. In this data set, mouse HOXB13 (F1-F3) was used as a positive control example to show that Methyl-Spec-seq can determine the relative binding energy for variants with different methylation property, i.e., unmethylated, top hemimethylated, bottom hemimethylated, duplex methylated by either chemical synthesis or enzymatic treatment.
2017-08-17 | GSE102703 | GEO
Project description:We developed a novel in-vitro experimental method to characterize the protein-DNA interaction specificity and methylation sensitivity, we called Methyl-Spec-seq. In this data set, mouse ZFP57 (F1-F3) was used as a positive control example to show that Methyl-Spec-seq can determine the relative binding energy for variants with different methylation property, i.e., unmethylated, top hemimethylated, bottom hemimethylated, duplex methylated by either chemical synthesis or enzymatic treatment.
2017-08-31 | GSE98686 | GEO
Project description:We developed a novel in-vitro experimental method to characterize the protein-DNA interaction specificity and methylation sensitivity, we called Methyl-Spec-seq. In this data set, mouse AP1 was used as a positive control example to show that Methyl-Spec-seq can determine the relative binding energy for variants with different methylation property, i.e., unmethylated, top hemimethylated, bottom hemimethylated, duplex methylated by either chemical synthesis or enzymatic treatment.
2017-10-11 | GSE98669 | GEO
Project description:We developed a novel in-vitro experimental method to characterize the protein-DNA interaction specificity and methylation sensitivity, we called Methyl-Spec-seq. In this data set, mouse ZFP57 (F1-F3) was used as a positive control example to show that Methyl-Spec-seq can determine the relative binding energy for variants with different methylation property, i.e., unmethylated, top hemimethylated, bottom hemimethylated, duplex methylated by either chemical synthesis or enzymatic treatment.
2017-05-10 | GSE98542 | GEO
Project description:The AP1 transcription factor Batf3 is required for homeostatic development of CD8?(+) classical dendritic cells that prime CD8 T-cell responses against intracellular pathogens. Here we identify an alternative, Batf3-independent pathway in mice for CD8?(+) dendritic cell development operating during infection with intracellular pathogens and mediated by the cytokines interleukin (IL)-12 and interferon-?. This alternative pathway results from molecular compensation for Batf3 provided by the related AP1 factors Batf, which also functions in T and B cells, and Batf2 induced by cytokines in response to infection. Reciprocally, physiological compensation between Batf and Batf3 also occurs in T cells for expression of IL-10 and CTLA4. Compensation among BATF factors is based on the shared capacity of their leucine zipper domains to interact with non-AP1 factors such as IRF4 and IRF8 to mediate cooperative gene activation. Conceivably, manipulating this alternative pathway of dendritic cell development could be of value in augmenting immune responses to vaccines.
| S-EPMC3482832 | biostudies-literature