MPEP § 2422.04 — The Requirement for a Computer Readable Copy of the “Sequence Listing” (Annotated Rules)

§2422.04 The Requirement for a Computer Readable Copy of the “Sequence Listing”

USPTO MPEP version: BlueIron's Update: 2025-12-31

This page consolidates and annotates all enforceable requirements under MPEP § 2422.04, including statutory authority, regulatory rules, examiner guidance, and practice notes. It is provided as guidance, with links to the ground truth sources. This is information only, it is not legal advice.

The Requirement for a Computer Readable Copy of the “Sequence Listing”

This section addresses The Requirement for a Computer Readable Copy of the “Sequence Listing”. Primary authority: 35 U.S.C. 111(a), 35 U.S.C. 371, and 35 U.S.C. 122. Contains: 3 requirements, 1 prohibition, 1 guidance statement, 1 permission, and 5 other statements.

Key Rules

Topic

Sequence Listing Format

7 rules
StatutoryRecommendedAlways
[mpep-2422-04-e93b9ac903b66a84cbcab32c]
Office Must Share Sequences with NCBI and DDBJ/EBI
Note:
The Office must provide published sequence data to NCBI for GenBank publication and allow data exchange between NCBI, DDBJ, and EBI while maintaining confidentiality as required by 35 U.S.C. 122.

The information on the computer readable form will be entered into the Office’s database for searching and printing nucleotide and amino acid sequences. This electronic database will also enable the Office to provide published sequence data, in electronic form, to the National Center for Biotechnology Information (NCBI) for publication in GenBank, and enable NCBI to exchange data with the DNA Data Bank of Japan (DDBJ) and the European Bioinformatics Institute (EBI). It should be noted that the Office’s database complies with the confidentiality requirement imposed by 35 U.S.C. 122. Unpublished pending application sequences are maintained in the database separately from published or patented sequences. That is, the Office will not exchange or make public any information on any sequence until the patent application containing that information is published or matures into a patent, or as otherwise allowed by 35 U.S.C. 122.

Jump to MPEP SourceSequence Listing FormatAccess to Patent Application Files (MPEP 101-106)Sequence Listing Requirements
StatutoryInformativeAlways
[mpep-2422-04-174d68a372c400b3b7c77702]
Unpublished Sequences Not Publicly Shared Until Published
Note:
The Office will not exchange or make public any sequence information until the containing patent application is published or patented, adhering to confidentiality requirements.

The information on the computer readable form will be entered into the Office’s database for searching and printing nucleotide and amino acid sequences. This electronic database will also enable the Office to provide published sequence data, in electronic form, to the National Center for Biotechnology Information (NCBI) for publication in GenBank, and enable NCBI to exchange data with the DNA Data Bank of Japan (DDBJ) and the European Bioinformatics Institute (EBI). It should be noted that the Office’s database complies with the confidentiality requirement imposed by 35 U.S.C. 122. Unpublished pending application sequences are maintained in the database separately from published or patented sequences. That is, the Office will not exchange or make public any information on any sequence until the patent application containing that information is published or matures into a patent, or as otherwise allowed by 35 U.S.C. 122.

Jump to MPEP SourceSequence Listing FormatAccess to Patent Application Files (MPEP 101-106)Sequence Listing Requirements
StatutoryPermittedAlways
[mpep-2422-04-49cb09ab7f9c1241047eb5c0]
Correction of Sequence Listing During Pendency
Note:
The Office permits correction of the Sequence Listing submitted during pendency if it matches the computer readable form submitted at filing and other circumstances support the proposed change.

The Office may permit correction of the “Sequence Listing” submitted pursuant to 37 CFR 1.821(c), whether on physical sheets of paper or as a PDF image file, at the least, during the pendency of a given application by reference to the computer readable form thereof submitted pursuant to 37 CFR 1.821(e) if both the “Sequence Listing” and computer readable form were submitted at the time of filing of the application and the totality of the circumstances otherwise substantiate the proposed correction. A mere discrepancy between the “Sequence Listing” and the computer readable form may not, in and of itself, be sufficient to justify a proposed correction. In this regard, the Office will assume that the computer readable form has been incorporated by reference into the application when the “Sequence Listing” and computer readable form were submitted at the time of filing of the application. The Office will attempt to accommodate or address all correction issues, but it must be kept in mind that the real burden rests with the applicant to ensure that any discrepancies between the “Sequence Listing” and the CRF copy are eliminated or minimized. Applicants should be aware that there will be instances where the applicant may have to suffer the consequences of any discrepancies between the two. It is noted that in an application filed under 35 U.S.C. 111(a) in which applicant has not filed a second copy of the “Sequence Listing” as a PDF image file or on physical sheets of paper (see 37 CFR 1.821(e)(1)), an ASCII plain text file will serve as both the “Sequence Listing” required by 37 CFR 1.821(c) and the CRF required by 37 CFR 1.821(e), eliminating any chance for discrepancies. Filing the “Sequence Listing” as an ASCII plain text file submitted via the USPTO patent electronic filing system that complies with both 37 CFR 1.821(c) and (e) is the Office’s preferred method of receiving a “Sequence Listing”.

Jump to MPEP Source · 37 CFR 1.821(c)Sequence Listing FormatSequence Listing Requirements
StatutoryProhibitedAlways
[mpep-2422-04-9280b6bc5fa677b82122719d]
Discrepancy Between Sequence Listing and CRF Not Grounds for Correction
Note:
The Office will not permit correction of the Sequence Listing based solely on discrepancies with the computer readable form if both were submitted at filing.

The Office may permit correction of the “Sequence Listing” submitted pursuant to 37 CFR 1.821(c), whether on physical sheets of paper or as a PDF image file, at the least, during the pendency of a given application by reference to the computer readable form thereof submitted pursuant to 37 CFR 1.821(e) if both the “Sequence Listing” and computer readable form were submitted at the time of filing of the application and the totality of the circumstances otherwise substantiate the proposed correction. A mere discrepancy between the “Sequence Listing” and the computer readable form may not, in and of itself, be sufficient to justify a proposed correction. In this regard, the Office will assume that the computer readable form has been incorporated by reference into the application when the “Sequence Listing” and computer readable form were submitted at the time of filing of the application. The Office will attempt to accommodate or address all correction issues, but it must be kept in mind that the real burden rests with the applicant to ensure that any discrepancies between the “Sequence Listing” and the CRF copy are eliminated or minimized. Applicants should be aware that there will be instances where the applicant may have to suffer the consequences of any discrepancies between the two. It is noted that in an application filed under 35 U.S.C. 111(a) in which applicant has not filed a second copy of the “Sequence Listing” as a PDF image file or on physical sheets of paper (see 37 CFR 1.821(e)(1)), an ASCII plain text file will serve as both the “Sequence Listing” required by 37 CFR 1.821(c) and the CRF required by 37 CFR 1.821(e), eliminating any chance for discrepancies. Filing the “Sequence Listing” as an ASCII plain text file submitted via the USPTO patent electronic filing system that complies with both 37 CFR 1.821(c) and (e) is the Office’s preferred method of receiving a “Sequence Listing”.

Jump to MPEP Source · 37 CFR 1.821(c)Sequence Listing FormatSequence Listing Requirements
StatutoryInformativeAlways
[mpep-2422-04-6b73c348d7114b5744b2534f]
Computer Readable Form Assumed for Sequence Listing
Note:
The Office assumes the computer readable form is incorporated by reference when both the 'Sequence Listing' and computer readable form are submitted at filing.

The Office may permit correction of the “Sequence Listing” submitted pursuant to 37 CFR 1.821(c), whether on physical sheets of paper or as a PDF image file, at the least, during the pendency of a given application by reference to the computer readable form thereof submitted pursuant to 37 CFR 1.821(e) if both the “Sequence Listing” and computer readable form were submitted at the time of filing of the application and the totality of the circumstances otherwise substantiate the proposed correction. A mere discrepancy between the “Sequence Listing” and the computer readable form may not, in and of itself, be sufficient to justify a proposed correction. In this regard, the Office will assume that the computer readable form has been incorporated by reference into the application when the “Sequence Listing” and computer readable form were submitted at the time of filing of the application. The Office will attempt to accommodate or address all correction issues, but it must be kept in mind that the real burden rests with the applicant to ensure that any discrepancies between the “Sequence Listing” and the CRF copy are eliminated or minimized. Applicants should be aware that there will be instances where the applicant may have to suffer the consequences of any discrepancies between the two. It is noted that in an application filed under 35 U.S.C. 111(a) in which applicant has not filed a second copy of the “Sequence Listing” as a PDF image file or on physical sheets of paper (see 37 CFR 1.821(e)(1)), an ASCII plain text file will serve as both the “Sequence Listing” required by 37 CFR 1.821(c) and the CRF required by 37 CFR 1.821(e), eliminating any chance for discrepancies. Filing the “Sequence Listing” as an ASCII plain text file submitted via the USPTO patent electronic filing system that complies with both 37 CFR 1.821(c) and (e) is the Office’s preferred method of receiving a “Sequence Listing”.

Jump to MPEP Source · 37 CFR 1.821(c)Sequence Listing FormatSequence Listing Requirements
StatutoryRequiredAlways
[mpep-2422-04-87915a0d589ffcc78dda8884]
Applicant Must Ensure Sequence Listing Matches CRF
Note:
The Office will attempt to address discrepancies, but the applicant is responsible for ensuring that the 'Sequence Listing' matches the computer readable form submitted with the application.

The Office may permit correction of the “Sequence Listing” submitted pursuant to 37 CFR 1.821(c), whether on physical sheets of paper or as a PDF image file, at the least, during the pendency of a given application by reference to the computer readable form thereof submitted pursuant to 37 CFR 1.821(e) if both the “Sequence Listing” and computer readable form were submitted at the time of filing of the application and the totality of the circumstances otherwise substantiate the proposed correction. A mere discrepancy between the “Sequence Listing” and the computer readable form may not, in and of itself, be sufficient to justify a proposed correction. In this regard, the Office will assume that the computer readable form has been incorporated by reference into the application when the “Sequence Listing” and computer readable form were submitted at the time of filing of the application. The Office will attempt to accommodate or address all correction issues, but it must be kept in mind that the real burden rests with the applicant to ensure that any discrepancies between the “Sequence Listing” and the CRF copy are eliminated or minimized. Applicants should be aware that there will be instances where the applicant may have to suffer the consequences of any discrepancies between the two. It is noted that in an application filed under 35 U.S.C. 111(a) in which applicant has not filed a second copy of the “Sequence Listing” as a PDF image file or on physical sheets of paper (see 37 CFR 1.821(e)(1)), an ASCII plain text file will serve as both the “Sequence Listing” required by 37 CFR 1.821(c) and the CRF required by 37 CFR 1.821(e), eliminating any chance for discrepancies. Filing the “Sequence Listing” as an ASCII plain text file submitted via the USPTO patent electronic filing system that complies with both 37 CFR 1.821(c) and (e) is the Office’s preferred method of receiving a “Sequence Listing”.

Jump to MPEP Source · 37 CFR 1.821(c)Sequence Listing FormatSequence Listing Requirements
StatutoryRequiredAlways
[mpep-2422-04-7bcb457865f97f76efffefee]
ASCII Text File Preferred for Sequence Listing
Note:
Applicants must submit the 'Sequence Listing' as an ASCII plain text file to avoid discrepancies with the computer readable form.

The Office may permit correction of the “Sequence Listing” submitted pursuant to 37 CFR 1.821(c), whether on physical sheets of paper or as a PDF image file, at the least, during the pendency of a given application by reference to the computer readable form thereof submitted pursuant to 37 CFR 1.821(e) if both the “Sequence Listing” and computer readable form were submitted at the time of filing of the application and the totality of the circumstances otherwise substantiate the proposed correction. A mere discrepancy between the “Sequence Listing” and the computer readable form may not, in and of itself, be sufficient to justify a proposed correction. In this regard, the Office will assume that the computer readable form has been incorporated by reference into the application when the “Sequence Listing” and computer readable form were submitted at the time of filing of the application. The Office will attempt to accommodate or address all correction issues, but it must be kept in mind that the real burden rests with the applicant to ensure that any discrepancies between the “Sequence Listing” and the CRF copy are eliminated or minimized. Applicants should be aware that there will be instances where the applicant may have to suffer the consequences of any discrepancies between the two. It is noted that in an application filed under 35 U.S.C. 111(a) in which applicant has not filed a second copy of the “Sequence Listing” as a PDF image file or on physical sheets of paper (see 37 CFR 1.821(e)(1)), an ASCII plain text file will serve as both the “Sequence Listing” required by 37 CFR 1.821(c) and the CRF required by 37 CFR 1.821(e), eliminating any chance for discrepancies. Filing the “Sequence Listing” as an ASCII plain text file submitted via the USPTO patent electronic filing system that complies with both 37 CFR 1.821(c) and (e) is the Office’s preferred method of receiving a “Sequence Listing”.

Jump to MPEP Source · 37 CFR 1.821(c)Sequence Listing FormatSequence Listing Requirements
Topic

Sequence Listing Content

2 rules
StatutoryInformativeAlways
[mpep-2422-04-967b8779cbfc3e31078bb079]
Requirement for Sequence Listing
Note:
This rule requires applicants to provide a computer-readable copy of the sequence listing for applications filed before July 1, 2022.

[Editor Note: This section is not applicable to applications filed on or after July 1, 2022, having disclosures of nucleotide and/or amino acid sequences as defined in 37 CFR 1.831(b). See MPEP §§ 2412 – 2419 for guidance on WIPO ST.26 requirements for applications filed on or after July 1, 2022.]

37 CFR 1.77 · 37 CFR 1.831(b)Sequence Listing ContentSequence Listing RequirementsSequence Listing Format
StatutoryInformativeAlways
[mpep-2422-04-8cdd6ef6945550f301ac2e27]
Computer Readable Form Sequences Entered into Office’s Database
Note:
Sequences from the computer readable form must be entered into the Office's database for searching and printing, with unpublished sequences kept confidential until publication or patenting.

The information on the computer readable form will be entered into the Office’s database for searching and printing nucleotide and amino acid sequences. This electronic database will also enable the Office to provide published sequence data, in electronic form, to the National Center for Biotechnology Information (NCBI) for publication in GenBank, and enable NCBI to exchange data with the DNA Data Bank of Japan (DDBJ) and the European Bioinformatics Institute (EBI). It should be noted that the Office’s database complies with the confidentiality requirement imposed by 35 U.S.C. 122. Unpublished pending application sequences are maintained in the database separately from published or patented sequences. That is, the Office will not exchange or make public any information on any sequence until the patent application containing that information is published or matures into a patent, or as otherwise allowed by 35 U.S.C. 122.

Jump to MPEP SourceSequence Listing ContentSequence Listing RequirementsAccess to Pending Applications
Topic

Copy Quality

2 rules
StatutoryInformativeAlways
[mpep-2422-04-d443d495a2094d2a440a7ca8]
Requirement for Sequence Listing in Computer Readable Form
Note:
Submit a copy of the Sequence Listing in computer readable form via USPTO electronic filing system or optical disc.

37 CFR 1.821(e) requires the submission of a copy of the “Sequence Listing” in computer readable form (CRF) in an application filed under 35 U.S.C. 111(a) or in a national stage application submitted under 35 U.S.C. 371. A separate computer readable form must be submitted via the USPTO patent electronic filing system or on read-only optical disc(s), as permitted by 37 CFR 1.824(b), when the “Sequence Listing” required by 37 CFR 1.821(c) is submitted as a PDF image file or on physical sheets of paper in a U.S. application filed under 35 U.S.C. 111(a) (see 37 CFR 1.821(e)(1)) or when the “Sequence Listing” required by 37 CFR 1.821(c) is submitted as a PDF image file or on physical sheets of paper and not also submitted as an ASCII plain text file in a national stage application (see 37 CFR 1.821(e)(2)). However, the Office prefers submission of sequence information as an ASCII plain text file via the USPTO patent electronic filing system or on read-only optical disc(s) without a copy of the “Sequence Listing” as a PDF image file or on physical sheets of paper in all applications because such an ASCII submission will serve as both the “Sequence Listing” required by 37 CFR 1.821(c) and the CRF of the “Sequence Listing” required by 37 CFR 1.821(e) and the “Sequence Listing” submitted as an ASCII plain text file will not be included in the application size fee determination under 37 CFR 1.52(f)(1) or (2). See MPEP § 2422.03(a)(I).

Jump to MPEP Source · 37 CFR 1.821(e)Copy QualityNationals and ResidentsReceiving Office (RO/US)
StatutoryRequiredAlways
[mpep-2422-04-1859e62d366e68491cba67b8]
Sequence Listing Must Be Submitted in ASCII Plain Text
Note:
The 'Sequence Listing' must be submitted as an ASCII plain text file via the USPTO patent electronic filing system or on read-only optical disc(s) to meet the requirements for a computer readable form.

37 CFR 1.821(e) requires the submission of a copy of the “Sequence Listing” in computer readable form (CRF) in an application filed under 35 U.S.C. 111(a) or in a national stage application submitted under 35 U.S.C. 371. A separate computer readable form must be submitted via the USPTO patent electronic filing system or on read-only optical disc(s), as permitted by 37 CFR 1.824(b), when the “Sequence Listing” required by 37 CFR 1.821(c) is submitted as a PDF image file or on physical sheets of paper in a U.S. application filed under 35 U.S.C. 111(a) (see 37 CFR 1.821(e)(1)) or when the “Sequence Listing” required by 37 CFR 1.821(c) is submitted as a PDF image file or on physical sheets of paper and not also submitted as an ASCII plain text file in a national stage application (see 37 CFR 1.821(e)(2)). However, the Office prefers submission of sequence information as an ASCII plain text file via the USPTO patent electronic filing system or on read-only optical disc(s) without a copy of the “Sequence Listing” as a PDF image file or on physical sheets of paper in all applications because such an ASCII submission will serve as both the “Sequence Listing” required by 37 CFR 1.821(c) and the CRF of the “Sequence Listing” required by 37 CFR 1.821(e) and the “Sequence Listing” submitted as an ASCII plain text file will not be included in the application size fee determination under 37 CFR 1.52(f)(1) or (2). See MPEP § 2422.03(a)(I).

Jump to MPEP Source · 37 CFR 1.821(e)Copy QualityNationals and ResidentsReceiving Office (RO/US)
Topic

Access to Pending Applications

1 rules
StatutoryInformativeAlways
[mpep-2422-04-a69f4acd69ed122cfa35329b]
Unpublished Pending Sequences Kept Separate
Note:
Unpublished sequences from pending applications are stored separately in the database, not shared until published or patented.

The information on the computer readable form will be entered into the Office’s database for searching and printing nucleotide and amino acid sequences. This electronic database will also enable the Office to provide published sequence data, in electronic form, to the National Center for Biotechnology Information (NCBI) for publication in GenBank, and enable NCBI to exchange data with the DNA Data Bank of Japan (DDBJ) and the European Bioinformatics Institute (EBI). It should be noted that the Office’s database complies with the confidentiality requirement imposed by 35 U.S.C. 122. Unpublished pending application sequences are maintained in the database separately from published or patented sequences. That is, the Office will not exchange or make public any information on any sequence until the patent application containing that information is published or matures into a patent, or as otherwise allowed by 35 U.S.C. 122.

Jump to MPEP SourceAccess to Pending ApplicationsSequence Listing RequirementsSequence Listing Content
Topic

Alterations and Corrections

1 rules
StatutoryRecommendedAlways
[mpep-2422-04-93c7c6c371321b8926240ac4]
No Obligation to Permanently Preserve CRFs Submitted on Optical Discs
Note:
The Office is not required to permanently preserve computer readable forms submitted on optical discs after processing, and applicants should not expect the discs to be returned.

The Office does not desire to be bound by a requirement to permanently preserve computer readable forms submitted on read-only optical disc(s) for support, priority or correction purposes. Thus, once use of the CRF by the Office for processing has ended, i.e., once the Office has entered the data contained on the computer readable form into the appropriate database, the Office does not intend to further preserve the CRF submitted by the applicant, and applicant should not expect to have the read-only optical disc(s) returned. See 37 CFR 1.52(e)(6).

Jump to MPEP Source · 37 CFR 1.52(e)(6)Alterations and CorrectionsLegibility and PermanenceGeneral Filing and Format Requirements

Citations

Primary topicCitation
Copy Quality
Sequence Listing Format
35 U.S.C. § 111(a)
Access to Pending Applications
Sequence Listing Content
Sequence Listing Format
35 U.S.C. § 122
Copy Quality35 U.S.C. § 371
Alterations and Corrections37 CFR § 1.52(e)(6)
Copy Quality37 CFR § 1.52(f)(1)
Copy Quality
Sequence Listing Format
37 CFR § 1.821(c)
Copy Quality
Sequence Listing Format
37 CFR § 1.821(e)
Copy Quality
Sequence Listing Format
37 CFR § 1.821(e)(1)
Copy Quality37 CFR § 1.821(e)(2)
Copy Quality37 CFR § 1.824(b)
Sequence Listing Content37 CFR § 1.831(b)
Sequence Listing ContentMPEP § 2412
Copy QualityMPEP § 2422.03(a)(I)

Source Text from USPTO’s MPEP

This is an exact copy of the MPEP from the USPTO. It is here for your reference to see the section in context.

BlueIron Last Updated: 2025-12-31