The Abundant Larval Transcript-1 and -2 Genes ofBrugia malayi Encode Stage-Specific Candidate Vaccine Antigens for Filariasis

W F Gregory, A K Atmadja, J E Allen, R M Maizels, Judith Allen

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Lymphatic filariasis is a major tropical disease caused by the mosquito-borne nematodes Brugia and Wuchereria. About 120 million people are infected and at risk of lymphatic pathology such as acute lymphangitis and elephantiasis. Vaccines against filariasis must generate immunity to the infective mosquito-derived third-stage larva (L3) without accentuating immunopathogenic responses to lymphatic-dwelling adult parasites. We have identified two highly expressed genes, designated abundant larval transcript-1 and -2 (alt-1 and alt-2), from each of which mRNAs account for >1% of L3 cDNAs. ALT-1 and ALT-2 share 79% amino acid identity across 125 residues, including a putative signal sequence and a prominent acidic tract. Expression of alt-1 and alt-2 is initiated midway through development in the mosquito, peaking in the infective larva and declining sharply following entry into the host. Humans exposed to Brugia malayi show a high frequency of immunoglobulin G1 (IgG1) and IgG3 antibodies to ALT-1 and -2, distinguishing them from adult-stage antigens, which are targeted by the IgG4 isotype. Immunization of susceptible rodents (jirds) with ALT-1 elicited a 76% reduction in parasite survival, the highest reported for a single antigen from any filarial parasite. ALT-1 and the closely related ALT-2 are therefore strong candidates for a future vaccine against human filariasis.
Original languageEnglish
Pages (from-to)4174-9
Number of pages6
JournalInfection and Immunity
Issue number7
Publication statusPublished - 2000

Keywords / Materials (for Non-textual outputs)

  • Amino Acid Sequence
  • Animals
  • Antigens, Helminth
  • Base Sequence
  • Brugia malayi
  • Caenorhabditis elegans
  • DNA Primers
  • Elephantiasis, Filarial
  • Gene Expression Regulation, Developmental
  • Genetic Variation
  • Gerbillinae
  • Helminth Proteins
  • Humans
  • Immunization
  • Introns
  • Larva
  • Male
  • Molecular Sequence Data
  • Sequence Homology, Amino Acid
  • Vaccines


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