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fda-comment-FDA-2026-D-1256

Public comment submission to FDA docket FDA-2026-D-1256 — Considerations for the Use of the Plausible Mechanism Framework To Develop Individualized Therapies That Target Specific Genetic Conditions With Known Biological Cause (CBER + CDER joint draft guidance, FR 2026-03713, released 2026-02-25; comment deadline 2026-04-27 23:59 ET).

Status (2026-04-25) — Submitted to regulations.gov. Interim tracking: mod-xns0-69oq. Final docket comment ID will be assigned by FDA when the comment is posted. The bundle in this repository is byte-frozen at the submitted version; per-file SHA-256 hashes are in bundle/expected_sha256.txt and verifiable via bundle/script/verify.sh.

⚠️ DISCLAIMER — Methodological exploration. Not for clinical, regulatory, commercial, or personal-use purposes. The comment proposes structured-record formats for plausible-mechanism evidence; it does not endorse, apply for, or recommend any specific therapy.

Contents

Sibling repository to FDA-2026-D-1255 (NGS off-target methodology; in preparation, deadline 2026-07-14). The two dockets are methodologically complementary:

D-1255 D-1256
Layer Methodology (NGS off-target execution) Framework (what evidence counts as plausible)
Sponsor duty Run per-methodology off-target analysis Assemble plausible-mechanism evidence package
Record role Parameter library for variant-aware pipeline Reasoning manifest schema for mechanism → outcome

What is being submitted

  • Attachment 1 — bundle/docket_comment.pdf — the full comment (§1–§10, Appendix A–D).
  • Attachment 2 — schema bundle (zip): the schema (bundle/d1256_schema_v0.1.json, Draft 0.2), two worked instances (BCL11A, AAVS1), their validator renders, the reference validator, and a 36-test pytest suite.
  • Attachment 3 — bundle/expected_sha256.txt — SHA-256 manifest of deterministic outputs.

Reproducibility

# Verify all deterministic outputs match the SHA-256 manifest
bash bundle/script/verify.sh
# Expected: ok=8 mismatch=0 missing=0

# Run the validator against the bundled instances
python3 scripts/d1256_validate_and_render.py bundle/d1256_schema_instance_BCL11A.json
python3 scripts/d1256_validate_and_render.py bundle/d1256_schema_instance_AAVS1.json
# Expected: "OK (schema Draft 2020-12 validation passed)."

# Run the regression test suite
pytest scripts/test_d1256_validator.py -q
# Expected: 36 passed

Repository layout

bundle/
  ├── docket_comment.{md,html,pdf}          Final comment text (18 pp PDF)
  ├── d1256_schema_v0.1.json                JSON Schema 2020-12, Draft 0.2
  ├── d1256_schema_instance_BCL11A.json     Worked example: BCL11A +58 enhancer
  ├── d1256_schema_instance_AAVS1.json      Worked example: AAVS1 safe-harbor
  ├── renders/                               Validator-generated human-readable renders
  ├── citations.bib                          Bibliography
  ├── expected_sha256.txt                    Reproducibility manifest
  └── script/                                verify.sh, make_pdf.sh
scripts/
  ├── d1256_validate_and_render.py          Reference validator + Markdown renderer
  └── test_d1256_validator.py               pytest suite (36 tests)
submission_log.md                            Append-only submission tracking

License

  • Code (scripts/, bundle/script/): Apache 2.0
  • Documentation and specifications (bundle/docket_comment.*, this README): CC-BY 4.0
  • Schema and manifest instances (bundle/d1256_schema_v0.1.json, bundle/d1256_schema_instance_*.json, bundle/renders/*.md): CC0

See LICENSE for details.

Sibling submission

FDA-2026-D-1255 — the methodology-layer companion (NGS off-target safety assessment for Cas9-based human somatic genome editing; in preparation, deadline 2026-07-14).

Author

Charles Jia (robotmem project) — gadesawnordeatine@gmail.com

How to cite

Jia, C. (2026). Public comment on FDA-2026-D-1256: a structured reasoning manifest for plausible-mechanism evidence packages. Docket comment. https://github.com/robotmem/fda-comment-FDA-2026-D-1256