Mosaic is now liveMCP tools, 760+ targets across oncology, neuro and cardio, preprint on Zenodo.See plans →
Mosaic

Case study

Modality gaps in the bromodomain reader family

Which bromodomain targets lack covalent / degrader / macrocycle chemistry?

Tools exercised:modality_gaps
Reproduce in your client

The question

Operator-authored prose pending

modality coverage as a whitespace lens: which chemistries have been tried against a family, and which haven't, in a database large enough to make 'never tried' a meaningful signal — operator writes this section as long-form prose, ~150–250 words, footnoted, slow. Scaffold only.

Strategic context

Operator-authored prose pending

BET/BRD family history: pan-BET inhibitors failed broadly; degraders (dBET1, ARV-825 lineage) reopened the space; covalent and macrocycle chemistries have been notably absent — why? — operator writes this section as long-form prose, ~150–250 words, footnoted, slow. Scaffold only.

The Mosaic-derived answer

Operator-authored prose pending

interpret the figure: small-molecule coverage is broad, degraders are concentrated on BRD4 only, and covalent / macrocycle / peptide-like are absent across the whole family — operator writes this section as long-form prose, ~150–250 words, footnoted, slow. Scaffold only.

Figure 1 — illustrative. Same shape as a live tool response, fixture values until the operator captures a live run.
Fig 1. mosaic_modality_gaps across the BET family (BRD2, BRD3, BRD4, BRDT). Counts are top-ranked compounds with a heuristic SMILES modality class. Most-gapped modalities (absent across ≥3 of 4 targets): covalent, macrocycle.

The graph reasoning, step by step

Operator-authored prose pending

SMILES → heuristic modality classifier → compound_targets join → group by target × modality → absent_modalities = canonical 5 minus present; unclassified compounds reported separately for honesty — operator writes this section as long-form prose, ~150–250 words, footnoted, slow. Scaffold only.

Implications

Operator-authored prose pending

program ideas: covalent BET binders targeting an acquired cysteine; macrocyclic stapled-peptide BD1/BD2 selectivity; BRDT-specific degraders as a contraceptive-adjacent niche — operator writes this section as long-form prose, ~150–250 words, footnoted, slow. Scaffold only.

Limitations & honesty

Operator-authored prose pending

heuristic SMILES classifier is partial; family-level rollup is target-by-target stacked (protein_family is unpopulated upstream); 'absent' = absent from our top-ranked compounds, not literally never made anywhere — operator writes this section as long-form prose, ~150–250 words, footnoted, slow. Scaffold only.

Related case studies