Experiment / E3RAVR7KOIntegrated lentiMPRA

K-562 integrated lentiMPRA — Library C with minimal promoter

Design principles of cell-state-specific enhancers in hematopoiesis

The broad Library C pairwise motif library covering 42 transcription factors was delivered to human K-562 cells using the standard minimal promoter and measured in duplicate at the early post-transduction time point.

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Organism: Human
Taxonomy ID: NCBITaxon:9606
Biosample: CVCL:0004
Reference genome: Not reported / not applicable
Design focus: Synthetic / Motif-focused
Region of interest: Not reported / not applicable

Perturbation & assay details

Basal / Untreated

Lentiviral reporter assay using pLS-SceI (Addgene plasmid #137725), with the regulatory element cloned upstream of the indicated minimal promoter and an EGFP reporter. K-562 cells were transduced in duplicate and assayed by DNA/RNA UMI counts from the reporter 5′ UTR. The two replicate activities are log2 library-size-normalized RNA/DNA values; random-DNA subtraction and Trp53 scaling follow the authors' published definitions. The source processing table describes the early K-562 Library C screen as 3 days post-infection with minimum two association reads, UMI read threshold 1, capped DNA UMIs, RNA-only barcodes counted on DNA, minimum 40 UMIs per GRE, and DNA normalization.

Processed data

50 rows per page. Click a cell to inspect its full value.

Visible columns (31 of 31)

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Filters apply to this table only. The CSV download contains the complete processed table; filtered rows are available through the API.

Column dictionary · 31 definitions

element_id: Unique identifier for the tested gene-regulatory element (source CRS).
source_data_object: Name of the main DATA object in the public Figshare R archive.
cell_state_id: Source cell-state cluster identifier; aggregate_HSPC denotes the supplied across-cell-state aggregate view.
cell_state: Cell-state label mapped from the archived cellstate.map vector; K562 denotes State_9K.
library: Paper/library identity assigned from the public DATA-object name and the article (A–H).
source_library_label: Verbatim Library field in the R archive, retained for provenance; it is inconsistent with the object/paper identity for some libraries.
sequence: Reporter insert DNA sequence; in synthetic libraries uppercase letters encode placed motifs and lowercase letters encode background DNA as supplied.
rna_count_rep1: Raw UMI-derived reporter RNA molecule count for replicate 1.
dna_count_rep1: Raw UMI-derived plasmid DNA molecule count for replicate 1.
rna_count_rep2: Raw UMI-derived reporter RNA molecule count for replicate 2.
dna_count_rep2: Raw UMI-derived plasmid DNA molecule count for replicate 2.
rna_normalized_rep1: Library-size-normalized reporter RNA count for replicate 1.
dna_normalized_rep1: Library-size-normalized plasmid DNA count for replicate 1.
rna_normalized_rep2: Library-size-normalized reporter RNA count for replicate 2.
dna_normalized_rep2: Library-size-normalized plasmid DNA count for replicate 2.
activity_log2_raw_rep1: Raw log2 RNA/DNA activity for replicate 1 after library-size normalization.
activity_log2_raw_rep2: Raw log2 RNA/DNA activity for replicate 2 after library-size normalization.
activity_log2_adjusted_rep1: Replicate-1 activity after subtracting the median random-DNA baseline.
activity_log2_adjusted_rep2: Replicate-2 activity after subtracting the median random-DNA baseline.
activity_log2_raw_mean: Mean raw log2 RNA/DNA activity across the two replicates.
activity_log2_adjusted_mean: Mean baseline-adjusted log2 RNA/DNA activity across the two replicates; preferred quantitative activity score.
activity_scaled_mean: Source visualization scale with random-DNA activity at 0 and the Trp53 reference at 1; not the preferred score for modeling or statistical testing.
motif_spacing_bp: Spacing between placed motif sites in base pairs (source spacer).
tf1_name: Name of the first TF motif from the 5′ end of the sequence.
tf1_affinity: Designed affinity of the first TF motif/site set.
tf1_orientation: Orientation of the first TF motif/site set.
tf2_name: Name of the second TF motif from the 5′ end of the sequence.
tf2_affinity: Designed affinity of the second TF motif/site set.
tf2_orientation: Orientation of the second TF motif/site set.
sites_per_factor: Number of sites assigned to each factor in the pair design (source TFnumber).
tf_site_order: Arrangement of paired sites, such as Alternate or Block (source TForder).

Quality control

The authors filtered the GRE–barcode association by alignment score (290–292), dominant assignment support (assigned reads at least five times deviant-assignment reads), barcode homopolymer content (removed barcodes with more than 10 identical nucleotides), and sequencing-error correction. MPRA reads required concordant forward/reverse barcode reads and underwent UMI error correction. The supplied DATA frame is the authors' post-processing/post-QC element-by-cell-state table. Package QC additionally required complete identifiers, non-empty sequences, positive raw DNA/RNA counts, and finite normalized/activity values. The public DATA object retained 23,392 of 23,392 rows (0 removed); the adjusted-activity replicate Pearson correlation is 0.977.

Curation notes

The DATA object is K562.libC.minP.tra and its source_library_label is LibB. The object name and pair-design schema are used for the paper library identity.

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