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Inter- and intra-patient sequence diversity among parainfluenza virus-type 1 nucleoprotein genes

V P Dave1, S V Hetherington, A Portner

  • 1Department of Immunology, St. Jude Children's Research Hospital, Tennessee, USA.

Virus Genes
|January 1, 1997
PubMed

Insights

Parainfluenza virus (PIV) type 1 shows significant genetic variability in its nucleoprotein (NP) sequence. This diversity may explain PIV re-infections and vaccine failures.

Area of Science:

  • Virology
  • Immunology
  • Molecular Biology

Background:

  • Parainfluenza viruses (PIV) are classified into four types (1-4) based on antigenic properties.
  • Understanding PIV genetic diversity is crucial for vaccine development and efficacy.

Purpose of the Study:

  • To evaluate the sequence variability of the nucleoprotein (NP) gene in human PIV type 1 isolates.
  • To assess the implications of PIV genetic diversity on immune response and vaccine effectiveness.

Main Methods:

  • Analysis of short nucleoprotein (NP) gene segments from nine patients infected with PIV type 1.
  • Comparison of sequence variability within and between patient samples.

Main Results:

  • Significant genetic variability was observed in the NP sequence of PIV type 1, both within and between patients.
  • Previous studies indicated variability in hemagglutinin-neuraminidase and fusion protein sequences of PIV.

Conclusions:

  • PIV isolates within the same type exhibit considerable genetic instability.
  • Sequence variability may lead to immune responses not fully protective against homologous PIV types, contributing to re-infections and vaccine failures.
  • Analyzing breakthrough viruses is essential to understand the impact of PIV diversity on vaccine outcomes.

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