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Homo-Tag-Assembler Assay for Full-Length Antibody Sequencing.

Nuomin Li1,2, Xu Wang2, Hao Wang2

  • 1Department of Comprehensive Basic Experiment, The Ninth Medical Center of Chinese PLA General Hospital, Beijing 100101, China.

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Researchers developed Homo-Tag-Assembler, a novel software tool for accurate antibody sequencing. This method overcomes challenges in determining antibody sequences, achieving high accuracy for both light and heavy chains.

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Area of Science:

  • Immunology
  • Bioinformatics
  • Protein Sequencing

Background:

  • Antibody sequencing is crucial for understanding immune responses and developing therapeutics.
  • Existing methods face challenges including incomplete sequence coverage and ambiguity in isobaric residues like isoleucine and leucine.

Purpose of the Study:

  • To develop a computational tool for accurate full-length antibody variable region sequence reconstruction.
  • To address limitations in current antibody sequencing technologies.

Main Methods:

  • Development of the Homo-Tag-Assembler software utilizing a homology tag fuzzy string matching algorithm.
  • Analysis of amino acid distributions in antibody variable regions to create a specific probability table.
  • Application of the tool for *de novo* sequencing, peptide similarity evaluation, and differentiation of light/heavy chains and isoleucine/leucine.

Main Results:

  • Achieved full-length sequence coverage for the Herceptin antibody.
  • Demonstrated high accuracy: 99.1% for the light chain and 100% for the heavy chain variable regions.
  • Successfully differentiated isobaric residues (I/L) and assigned peptides to correct chains.

Conclusions:

  • The Homo-Tag-Assembler effectively reconstructs full-length antibody sequences.
  • The method leverages conserved regional features and homology information for robust and accurate sequencing.
  • This tool offers a significant advancement in antibody characterization and discovery.