The Enola Bean: When a Mexican Landrace Became a U.S. Patent

Case at a glance

Case number

059

Date / range

1999–2009

Sector

Genetic resources, agriculture, and biodiversity

Genetic asset

Yellow bean germplasm, patent claims, and prior-art records

Security principle

Genetic Resource Misappropriation

Event summary

The Enola bean patent controversy arose after a U.S. breeder obtained protection for a yellow bean developed from Mexican beans, then asserted rights that affected imports. The patent was ultimately invalidated after a long challenge.

Source: cgspace.cgiar.org — The Enola Bean Patent source 1.

Source: patents.google.com — The Enola Bean Patent source 2.

The case in context

The Enola bean dispute connected genetic-resource provenance with an exclusivity claim. Records of existing material and prior art became important to challenging the patent. Critics' descriptions of misappropriation should remain distinguishable from the legal grounds and outcome of the proceedings.

The broader lesson is that a genebank record can protect access as well as support research. Dates, origin information, and defensible accession histories help establish what existed before a claim. The case does not establish that all plant patents are improper or that selection can never produce a patentable invention.

Acquisition and processing

landrace acquisition → selection/patent filing → enforcement at border/market → prior-art and genetic comparison → challenge → revocation

The sequence of events

1. landrace acquisition
2. selection/patent filing
3. enforcement at border/market
4. prior-art and genetic comparison
5. challenge
6. revocation

What became inferable or exposed

Yellow bean germplasm, patent claims, and prior-art records

The Enola bean patent controversy arose after a U.S. breeder obtained protection for a yellow bean developed from Mexican beans, then asserted rights that affected imports. The patent was ultimately invalidated after a long challenge.

Affected parties and consent

Direct parties

Growers, importers, and custodians of relevant germplasm

Indirect parties

Connected institutions, communities, or resource users; no affected-person total is assigned.

Direct count

Unknown / not assigned

Indirect count

Unknown / not assigned

Consent status

Access, stewardship, breeding, and benefit-sharing arrangements depend on the collection and setting. These are not necessarily individual privacy questions.

Security dimensions

Confidentiality

The confidentiality question concerns yellow bean germplasm, patent claims, and prior-art records. Exposure and further inference must be distinguished from the fact of collection or availability.

Integrity

The integrity question is whether the described material, permissions, processing, or interpretation can be relied upon. Genetic Resource Misappropriation identifies the particular boundary examined here.

Availability

Access and continuity are assessed for the described event; potential effects are not presented as confirmed outages or losses.

Provenance

The relevant chain follows yellow bean germplasm, patent claims, and prior-art records through the stages shown below. Missing public detail is not proof that internal records did not exist.

Consent, persistence, and relational exposure

Consent

Access, stewardship, breeding, and benefit-sharing arrangements depend on the collection and setting. These are not necessarily individual privacy questions.

Persistence

Later reuse depends on the actual asset and links to other records; no future misuse is asserted.

Relational exposure

Connected institutions, communities, or resource users; no affected-person total is assigned.

Case-specific assessment

provenance critical; availability/access high; integrity of patent examination high; community consent and benefit sharing high.

GeneticSecurity.org analysis

Proposed classification and its limits

Suggested GER: GER-4/5. Suggested GPI: GPI-5 where accession history proves prior existence.

These are proposed classifications from the supplied case dossier. Conditional scores describe an assumed exposure; they are not evidence that it occurred. A single numeric value is left unassigned when the asset or outcome is not sufficiently bounded.

What this case does not prove

It does not mean all plant breeding patents are illegitimate or that selection can never be inventive.

Mitigations and lessons

• Defensive publication
• Accession timestamps
• Sequence/phenotype records
• Origin documentation
• Benefit-sharing agreements
• Patent-examiner access to germplasm databases

Primary sources

• PRIMARY SOURCE cgspace.cgiar.org — The Enola Bean Patent source 1
• PRIMARY SOURCE patents.google.com — The Enola Bean Patent source 2

Secondary sources

No additional source listed. See the evidence notes for limitations.

Related concepts

• Genetic Exposure Radius — Scope of relational exposure
• Genetic Persistence Risk — Durability after compromise
• Genetic Provenance Integrity — Verifiability of the chain of custody

Related cases

• Case 060 — Compare Bowman v. Monsanto for control of replicating genetic technology. This case focuses on genetic resource misappropriation.
• Case 061 — Compare Association For Molecular Pathology v. Myriad for ownership boundaries around genetic information. This case focuses on genetic resource misappropriation.
• Case 064 — Compare Digital Sequence Information And The Cali Fund for benefit sharing after digitization. This case focuses on genetic resource misappropriation.

Policy and standards

Review and correction history

Source edition: September 19, 2026. Imported case account; no substantive corrections recorded.

Cite this case

GS-CASE-059. The Enola Bean: When a Mexican Landrace Became a U.S. Patent. GeneticSecurity.org. https://geneticsecurity.org/cases/059-enola-bean-patent-genetic-resource/