The Art of ST.26 Sequence Listing Preparation: Best Practices for Accuracy and Compliance

Sequence listings are an essential part of biotech patent applications. They list nucleotide and/or amino acid sequences associated with the invention. These sequence listings assist patent offices in evaluating the novelty and non-obviousness of inventions. Thus, their accuracy, completeness, and compliance with the latest sequence listing standard are critical to the success of the patent application. In this article, we will discuss the best practices for ST26-compliant sequence listing preparation. By following these best practices, you can increase your chances of success in obtaining a patent for your invention.

Best Practices for ST.26 Sequence Listing Preparation

Ensure the correct file format: The sequence listing must be in a file format recognized by the patent office. The ST26 sequence listing standard prescribed by the World Intellectual Property Organization (WIPO) requires all listings to be shared in XML file formats. Ensuring the correct file format and adherence to formatting rules improves the readability of the sequence listing by patent examiners. It also reduces the risk of errors or rejection of the patent application.

Provide complete sequence information: An ST26-compliant sequence listing must include complete sequence information of each nucleotide or amino acid sequence. Thus, the listing must cover the entire sequence, including any untranslated regions (UTRs), introns, or other non-coding regions, as well as any relevant sequence features, such as promoters, enhancers, and poly(A) signals. Providing comprehensive sequence information ensures that the patent examiners clearly understand the invention and can properly evaluate the patent application.

Use consistent nomenclature: Consistent nomenclature throughout the ST26 sequence listing helps avoid confusion and potential patent application rejection. This entails using the correct abbreviations for amino acids and nucleotides, and following consistent naming conventions for any sequence features or mutations. Standardized terminologies, such as those provided by the Human Genome Variation Society (HGVS) or the Sequence Ontology (SO), should be used for any sequence features or mutations. This improves the clarity and consistency of the sequence listing, making it easier for patent examiners to understand and evaluate. Moreover, it is crucial to use nomenclature consistent with other parts of the patent application, including the claims and the description.

Follow the correct formatting requirements: Incorrect formatting can result in the rejection of the patent application. Thus, one must pay heed to specific file formats and information organization during sequence listing preparation. The World Intellectual Property Organization has established guidelines regarding the proper formatting, such as the use of the correct file format (for instance, plain text, XML), organizing sequence information (e.g., headers, feature tables), and utilizing controlled vocabularies (e.g., Feature Key names). Following these guidelines carefully ensures the sequence listing is clear, consistent, and meets the patent office’s requirements. Before submitting the patent application, it is also important to verify that the sequence listing accurately reflects the invention, that all required information is included, and that the formatting is correct.

Leverage the latest software tools: There are various software tools that can assist in the ST26-compliant sequence listing preparation. These include WIPO Sequence Suite, PatentIn 3.5, and BiSSAP. Such tools can help ensure the accuracy, completeness, and correct formatting of the sequence listing. These tools automate the process of creating the sequence listing – saving time and reducing the risk of errors. When selecting a software tool, one should consider its compatibility with the file format and the metadata requirements for the specific patent office where you plan to submit your application.

Use standardized identifiers: During sequence listing preparation, one must leverage standardized identifiers for the nucleic acids and proteins. This will ensure unambiguous and easy identification of the sequence information. Standardized identifiers, such as GenBank accession numbers, UniProt identifiers, and INSDC identifiers, aid cross-referencing by patent examiners and researchers. Moreover, it is also imperative to use the appropriate identifier for each specific sequence and verify its compatibility with the concerned patent office.

Include sequence variations: Single nucleotide polymorphisms (SNPs), insertions, deletions, and other variations can affect the function or structure of the molecule. Therefore, it is vital to include any sequence variations that occur in the nucleic acid and protein sequences in the sequence listing. This provides a complete and accurate representation of the sequence information. It can help in aiding in patentability assessments and enabling other researchers to reproduce your work. Additionally, it is also important to ensure that the sequence variations are accurately annotated and described. It will help patent examiners to fully understand their implications.

Keep descriptions concise: It is essential to use clear and concise descriptions for each sequence and associated features during ST26 sequence listing preparation. The descriptions should include coding regions, regulatory elements, or functional domains. Doing this will avoid ambiguity and confusion. It will also make it easier for patent examiners and other researchers to comprehend the sequence information. Additionally, providing references or supporting documentation, such as published literature or experimental data, can substantiate any functional or structural claims related to the sequence information. Using clear and concise descriptions improves the clarity and accuracy of the ST26 sequence listing. It also ensures that the patent application is based on error-free and complete sequence information.

Verify the sequence data: It is crucial to ensure the accuracy and completeness of the sequence data before submitting the ST26 sequence listing. This can be achieved by performing various quality control checks. This may include checking the sequence length, confirming the correct reading frame, and ensuring the accurate translation of coding regions. Furthermore, it is essential to verify that the sequence data is in the correct format, such as FASTA or XML. Also, one should document the verification process, including any discrepancies or errors, and provide supporting documentation, such as log files or screenshots. This will demonstrate the accuracy and completeness of the sequence data. By verifying the sequence data beforehand, you can ensure that your patent application is based on error-free sequence information. It can increase the likelihood of a successful patent grant.

Maintain a backup copy: It is crucial to keep a backup copy of your ST26 sequence listing to protect against data loss or corruption. Store the backup in a separate location or on a different device to minimize the risk of losing the data. Consider keeping multiple backup copies. It may include cloud storage service or an external hard drive, to ensure data safety. Ensure that the backup copies are up-to-date and reflect any changes or updates made to the original ST26 sequence listing. This best practice for sequence listing preparation helps recover data in case of accidental data loss, and other unforeseen circumstances.


ST26 sequence listing preparation is a critical step in the patent application process for biotech inventions. Adhering to best practices is crucial to ensure accuracy and completeness of the sequence data. By following the above-mentioned best practices, you can optimize your ST26 sequence listing for efficient examination. Doing this will minimize the risk of errors or delays in the patent application process.

The Sequence Listing Company specializes in converting ST25 to ST26 and fresh ST26-compliant sequence listing preparation. We have a team of 40 life sciences experts who can deliver error-free sequence listings within 24 hours. To know more about our expertise, visit our sequence listing service page.

Leave a Reply

Your email address will not be published. Required fields are marked *