HIV-1 Neutralizing Antibody Signatures and Application to Epitope-Targeted Vaccine Design

Cell Host Microbe. 2019 Jan 9;25(1):59-72.e8. doi: 10.1016/j.chom.2018.12.001.

Abstract

Eliciting HIV-1-specific broadly neutralizing antibodies (bNAbs) remains a challenge for vaccine development, and the potential of passively delivered bNAbs for prophylaxis and therapeutics is being explored. We used neutralization data from four large virus panels to comprehensively map viral signatures associated with bNAb sensitivity, including amino acids, hypervariable region characteristics, and clade effects across four different classes of bNAbs. The bNAb signatures defined for the variable loop 2 (V2) epitope region of HIV-1 Env were then employed to inform immunogen design in a proof-of-concept exploration of signature-based epitope targeted (SET) vaccines. V2 bNAb signature-guided mutations were introduced into Env 459C to create a trivalent vaccine, and immunization of guinea pigs with V2-SET vaccines resulted in increased breadth of NAb responses compared with Env 459C alone. These data demonstrate that bNAb signatures can be utilized to engineer HIV-1 Env vaccine immunogens capable of eliciting antibody responses with greater neutralization breadth.

Keywords: HIV-1; V2-apex antibodies; broadly neutralizing antibodies; hypervariable regions; machine learning; signature analysis; vaccine design.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Antibodies, Neutralizing / immunology*
  • Antibodies, Neutralizing / therapeutic use
  • Antibody Formation
  • Disease Models, Animal
  • Epitopes / genetics
  • Epitopes / immunology*
  • Female
  • Guinea Pigs
  • HEK293 Cells
  • HIV Antibodies / immunology*
  • HIV Envelope Protein gp120 / immunology
  • HIV Infections / immunology*
  • HIV Infections / prevention & control*
  • HIV Infections / virology
  • HIV-1 / genetics
  • Humans
  • Immunization
  • Inhibitory Concentration 50
  • Models, Molecular
  • Mutation
  • Peptide Fragments / immunology
  • Protein Binding
  • Vaccination
  • Vaccines*
  • env Gene Products, Human Immunodeficiency Virus / genetics
  • env Gene Products, Human Immunodeficiency Virus / immunology

Substances

  • Antibodies, Neutralizing
  • Epitopes
  • HIV Antibodies
  • HIV Envelope Protein gp120
  • HIV envelope protein gp120 (305-321)
  • Peptide Fragments
  • Vaccines
  • env Gene Products, Human Immunodeficiency Virus