Genetical and immunological analysis of recent Asian type A and O foot-and-mouth disease virus isolates

Brigitte Freiberg, Md. Mostafizur Rahman, Otfried Marquardt

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

This report extends the knowledge on the epizootical situation of foot-and-mouth disease in Asia. RNA from six samples of type A and five of type O virus, isolated between 1987 and 1997 in Bangladesh, Iran, Malaysia and Turkey, was subjected to reverse transcription-dependent polymerase chain reactions that amplify large parts of the capsid protein VP1 encoding genome region. The amplification products were sequenced, and the sequences aligned to each other and to published sequences. This showed the type O isolates of 1987-1997 from Bangladesh to be of same genotype and closely related to isolates of 1988 and later from Saudi Arabia, 1990 from India, 1996 from Greece and Bulgaria, and 1997 from Iran. Among the analyzed type A isolates, those of 1992 and 1996 from Turkey were of same genotype and related to previously described isolates of 1987 from Iran and of 1992 from Saudi Arabia. The isolate of 1997 from Malaysia was found to be related to isolates from Thailand of 1993 and 1996. The isolates of 1987 from Bangladesh and 1997 from Iran, however, represent different so far not described genotypes. Monoclonal antibodies, raised against the vaccine production strains A22 Iraq, Asia1 Shamir, O1 Kaufbeuren and O1 Manisa, and the recent type A field isolates Saudi Arabia/92 and Albania/96, were used in an ELISA to compare the reaction patterns of many of the field isolates. The monoclonal antibodies were further characterized for virus-neutralizing activity and binding to trypsinized homologous virus. The failure of neutralizing antibodies in binding to trypsinized homologous as well as to heterologous virus suggested the epitopes to reside at the major antigenic component of the virus, which is the capsid protein VP1. Two non-neutralizing antibodies that bind to trypsin-sensitive epitopes cross-reacted, however, with heterologous virus. This indicates the existence of a trypsin-sensitive antigenic site outside of VP1. In summary, the results obtained by ELISA confirm the observed sequence differences, but indicate further sequence differences at minor antigenic sites that do not reside on VP1.

Original languageEnglish
Pages (from-to)167-182
Number of pages16
JournalVirus Genes
Volume19
Issue number3
DOIs
Publication statusPublished - 1999
Externally publishedYes

Fingerprint

Foot-and-Mouth Disease Virus
Iran
Bangladesh
Saudi Arabia
Viruses
Malaysia
Genotype
Capsid Proteins
Turkey
Trypsin
Epitopes
Albania
Enzyme-Linked Immunosorbent Assay
Monoclonal Antibodies
Foot-and-Mouth Disease
Bulgaria
Viral Structures
Iraq
Greece
Thailand

Keywords

  • Monoclonal antibodies
  • Type A and O FMDV
  • VP1-coding sequence

ASJC Scopus subject areas

  • Virology
  • Molecular Biology
  • Immunology
  • Applied Microbiology and Biotechnology
  • Genetics

Cite this

Genetical and immunological analysis of recent Asian type A and O foot-and-mouth disease virus isolates. / Freiberg, Brigitte; Rahman, Md. Mostafizur; Marquardt, Otfried.

In: Virus Genes, Vol. 19, No. 3, 1999, p. 167-182.

Research output: Contribution to journalArticle

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