CRISPR in Rare Disease Treatment
A newborn baby, jaundiced and fragile, cradled in the arms of researchers who had just rewritten a single letter in his DNA. Within weeks of receiving a personalized CRISPR-based therapy, his liver began to function. The treatment had worked.
Known publicly as Baby KJ, this child was born with a severe metabolic disorder caused by one misspelled nucleotide out of three billion. His story, part medical miracle, part legal battleground captures the extraordinary tension at the heart of gene-editing medicine.
While researchers were celebrating in the lab, a different kind of battle was unfolding in courtrooms and patent offices. That battle would ultimately determine whether cures like Baby KJ's could ever reach the millions of patients who need them most.
1. What Is CRISPR?
CRISPR is an acronym for Clustered Regularly Interspaced Short Palindromic Repeats. It was not invented, it was discovered. In 1987, Japanese microbiologist Yoshizumi Ishino first observed mysterious repetitive sequences in bacterial DNA. Scientists confirmed only in 2007 that these sequences formed an adaptive immune system that bacteria had evolved to remember and destroy previously encountered viruses.
The transformative leap came in 2012, when Jennifer Doudna at UC Berkeley and Emmanuelle Charpentier published a landmark paper in Science. They demonstrated that the CRISPR-Cas9 system could be reprogrammed using a synthetic guide RNA to cut any DNA sequence, essentially converting a bacterial immune system into universal molecular scissors capable of editing the genome of any living organism.
Core Components
| Component | Role | Mechanism |
|---|---|---|
| Guide RNA (gRNA) | Targeting mechanism | Short synthetic RNA matches a specific genome sequence; binds its complementary DNA like a key finding its lock, directing Cas9 to the correct location |
| Cas9 Protein | Molecular scissors | Makes a precise double-strand break at the target site; cell's natural repair machinery then either knocks out or corrects the gene |
| DNA Repair Template | Correction blueprint | When correction rather than deletion is needed, this template instructs the cell's repair mechanism to copy the correct sequence as used in Baby KJ's treatment |
How CRISPR Works: Five Stages
Design
Program guide RNA to match the target DNA sequence
Delivery
Package CRISPR components into viral vectors, lipid nanoparticles, or via electroporation
Bind
Guide RNA scans genome and binds to its complementary sequence
Cut
Cas9 makes a controlled double-strand break at the target location
Repair
Cell's own machinery disables the gene or incorporates the correction template
Next-Generation CRISPR Variants
| Variant | Key Innovation | Primary Application |
|---|---|---|
| Base Editing | Changes a single DNA letter without cutting, reducing risk of unintended edits | Point mutations in rare diseases |
| Prime Editing | Works like search-and-replace, covering all 12-point mutations and small indels | Precision rare disease correction |
| CRISPR-Cas12 | Enhanced DNA specificity and activates collateral cleavage | Diagnostics and gene editing |
| CRISPR-Cas13 | Targets RNA rather than DNA — no permanent genome alteration | Viral diseases and gene expression |
| CRISPRa / CRISPRi | Activates or silences genes using deactivated Cas9 — no cutting | Gene regulation and functional studies |
2. Why the World Needs CRISPR
Around 80% of rare diseases are genetic in origin caused by mutations in single genes. For decades, medicine could only treat downstream consequences, manage symptoms or replace deficient proteins. The root genetic cause remained untouchable. CRISPR changes this at platform level.
Unlike previous therapeutic approaches, CRISPR operates as a platform. The same core machinery can be redirected to any gene in any patient simply by changing the guide RNA sequence. A company that demonstrates the safety and efficacy of CRISPR delivery for one liver-based rare disease has, in principle, cleared the path for dozens more — using largely the same platform, delivery vehicle, and manufacturing infrastructure.
3. CRISPR Patents: The Battle for Ownership
Intellectual property rights over foundational CRISPR technology represent one of the most commercially consequential patent disputes in biotechnology history. At stake are licensing fees and royalty streams potentially worth billions of dollars, control over which companies can develop CRISPR therapeutics and on what terms, and the degree to which patent monopolies translate into treatment prices beyond reach for most patients.
UC Berkeley — CVC Group
Jennifer Doudna, Emmanuelle Charpentier
Filed: May 2012 — cell-free biochemical setting
Claim: In vitro CRISPR-Cas9 programmed with synthetic gRNA
Argument: 2012 work inherently disclosed eukaryotic application
US licensee: Caribou Biosciences → Intellia Therapeutics
EU position: Stronger position after Broad EPO revocation
Charpentier: Independently licensed to CRISPR Therapeutics AG
Broad Institute — MIT & Harvard
Feng Zhang and colleagues
Filed: December 2012 — paid for accelerated processing
Claim: First to demonstrate CRISPR in living eukaryotic cells
Argument: Eukaryotic function required inventive steps beyond in vitro
US position: 31 granted US CRISPR patents as of 2025
EU position: Primary European patent revoked 2020
US licensee: Editas Medicine (primary therapeutic licensee)
Patent Milestone Timeline
Both UC Berkeley and Broad Institute file US patent applications within months of each other. The race begins.
Broad Institute receives the first US CRISPR patent through expedited processing, establishing an early advantage.
USPTO PTAB rules Broad patents valid and non-overlapping with UC Berkeley claims. Broad retains US patents.
European Patent Office revokes Broad's first European CRISPR patent on a procedural technicality. Editas stock falls 17% in one day. UC Berkeley gains European advantage.
PTAB reaffirms Broad's priority for eukaryotic cell editing following interference proceedings. Broad retains US position.
US Court of Appeals finds PTAB legally erred in its conception analysis; case remanded for reconsideration. Dispute continues.
4. Patent Landscape: Filing Trends and Global Distribution
Gene editing and cell therapy patent applications grew steadily from 593 in 2020 to a peak of 928 in 2023, before declining to 897 in 2024 and 759 in 2025. The peak filing momentum concentrated between 2022 and 2024 reflects accelerating clinical validation and commercial investment. The moderation from 2024 reflects consolidation of foundational positions rather than reduced innovation.
| Year | Patent Applications Filed | Count |
|---|---|---|
| 2020 | 593 | |
| 2021 | 680 | |
| 2022 | 812 | |
| 2023 | 928 | |
| 2024 | 897 | |
| 2025 | 759 |
Top Assignees - Institutional Dominance
MIT (175, 17%), University of California (172, 17%), and the Broad Institute (170, 17%) dominate with near-equal shares, together accounting for over half of all patent activity among the top 10. Regeneron Pharmaceuticals is the only purely commercial pharmaceutical company among the top 10 assignees, reflecting the field's deep academic roots.
| Assignee | Relative Share | Count | Rank |
|---|---|---|---|
| MIT | 175 | #1 | |
| University of California | 172 | #2 | |
| Broad Institute Inc | 170 | #3 | |
| University of Pennsylvania | 98 | #4 | |
| Harvard University | 88 | #5 | |
| University of Texas | 73 | #6 | |
| CRISPR Therapeutics AG | 69 | #7 | |
| Shanghai University | 68 | #8 | |
| Stanford University | 57 | #9 | |
| Regeneron Pharmaceuticals | 50 | #10 |
Geographic Distribution - US and China Lead
The United States dominates with 3,091 priority filings, followed by China at 1,394 together accounting for the overwhelming majority of first filings globally. The European Patent Office (228) and South Korea (121) represent the next significant contributors, while India, Singapore, Japan, and Australia contribute smaller but meaningful volumes.
| Jurisdiction | Relative Share | Count | Rank |
|---|---|---|---|
| United States (US) | 3,091 | #1 | |
| China (CN) | 1,394 | #2 | |
| EPO (EP) | 228 | #3 | |
| South Korea (KR) | 121 | #4 | |
| United Kingdom (UK) | 89 | #5 | |
| India (IN) | 34 | #6 | |
| Singapore (SG) | 29 | #7 | |
| Japan (JP) | 23 | #8 | |
| Australia (AU) | 19 | #9 |
5. CPC Classification Analysis
C12N2310/20 (CRISPR systems) dominates with 2,055 patents confirming CRISPR-based editing as the primary technology focus followed by C12N9/22 (ribonucleases/Cas proteins) at 1,715 and A61P35/00 (antineoplastic agents) at 1,526, reflecting oncology as the leading therapeutic indication. C12N15/113 (guide RNA technologies) at 1,469 underscores the centrality of non-coding nucleic acids to the platform.
| CPC Code | Description | Total Patents |
|---|---|---|
| C12N2310/20 | CRISPR Systems | 2,055 |
| C12N9/22 | Ribonucleases / Cas Proteins | 1,715 |
| A61P35/00 | Antineoplastic Agents | 1,526 |
| C12N15/113 | Non-coding Nucleic Acids / Guide RNA / Gene Silencing | 1,469 |
| C12N15/86 | Viral Vectors | 996 |
| C12N2510/00 | Genetically Modified Cells | 950 |
| C12N15/907 | Gene Modification in Mammalian Cells | 823 |
| A61K40/11 | Nucleic Acid-Based Therapeutics | 752 |
| C12N15/11 | DNA or RNA Fragments / Modified Non-coding Nucleic Acids | 680 |
| A61K40/31 | Therapeutic Nucleic Acid Compositions | 660 |
6. The First Approved CRISPR Drug - CASGEVY
In December 2023, CASGEVY (exagamglogene autotemcel) became the world's first approved CRISPR-based medicine. It received simultaneous regulatory authorization from the UK MHRA, the US FDA, and the European EMA for the treatment of sickle cell disease and transfusion-dependent beta-thalassaemia in patients aged 12 and older.
CASGEVY uses CRISPR-Cas9 to edit a patient's own haematopoietic stem cells outside the body, reactivating fetal haemoglobin production to compensate for the defective adult haemoglobin that causes both diseases. Clinical trial data through 2024 showed approximately 90% of treated patients remaining free from severe vaso-occlusive crises for more than 12 consecutive months after infusion, with a mean VOC-free duration of 29.3 months.
7. The Clinical Pipeline
Beyond CASGEVY, the CRISPR therapeutic pipeline is advancing rapidly. The most advanced program is Intellia Therapeutics' NTLA-2001 for transthyretin amyloid cardiomyopathy (hATTR), which completed Phase III enrolment with a filing planned for the second half of 2026. If approved, it would be the first in vivo CRISPR therapy administered directly into the body rather than requiring cells to be edited externally.
| Disease | Stage | Key Player | Approach |
|---|---|---|---|
| Sickle cell / beta-thalassemia | Approved (2023) | Vertex / CRISPR Therapeutics | Ex vivo stem cell editing — reactivates fetal haemoglobin |
| hATTR (transthyretin amyloidosis) | Phase III / filing 2026 | Intellia Therapeutics | In vivo liver editing — knocks out the TTR gene |
| Hereditary angioedema (HAE) | Phase I/II | Intellia Therapeutics | In vivo editing of the KLKB1 gene in the liver |
| Leber congenital amaurosis (LCA10) | Phase I/II | Editas Medicine | In vivo retinal editing — targets the CEP290 gene |
| Duchenne muscular dystrophy | Clinical / non-profit | Cure Rare Disease | Exon skipping via CRISPR |
| Inborn errors of metabolism (PKU) | Preclinical / early | Aurora Therapeutics | AI-designed personalised guide RNAs — platform approach |
| HIV | Phase I | Multiple groups | Excision of integrated viral DNA from the host genome |
8. Conclusion
CRISPR-Cas9 has come a long way in a remarkably short time — from a bacterial immune mechanism observed in a laboratory to a medicine that can rewrite a child's DNA and give them a chance at a normal life. The approval of CASGEVY in December 2023 was not just a scientific achievement; it was proof that gene editing can move from discovery to patient bedside.
The patent data tells the story of how much the world has invested in this technology. Filings grew from 593 in 2020 to a peak of 928 in 2023. The United States and China together account for the overwhelming majority of foundational filings. UC Berkeley, MIT, the Broad Institute, and Harvard together account for nearly half of all CRISPR patents underlying the central role that academic research has played in building this field.
Yet the long-running patent dispute between UC Berkeley and the Broad Institute, still unresolved after more than a decade, remains a reminder that groundbreaking science inevitably raises difficult questions about ownership, access, and who ultimately benefits. CPC data confirms that cancer treatment and CAR-T immunotherapy are the most active patent areas, while nucleic acid delivery, lipid nanoparticles, and precision editing tools like base editing signal where the next wave of innovation is heading.
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This article is provided for informational and educational purposes only. It does not constitute legal, financial, or professional advice. Readers are encouraged to consult a qualified patent attorney for specific guidance. Opinions expressed are solely those of the author.
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