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Human metapneumovirus G protein is highly conserved within but not between genetic lineages

Chin-Fen Yang1, Chiaoyin K Wang, Sharon J Tollefson

  • 1MedImmune Vaccines, LLC, Mountain View, CA, USA.

Archives of Virology
|February 7, 2013
PubMed

Insights

Human metapneumovirus (HMPV) glycoprotein G sequences show conserved lineages over 20 years, indicating functional constraints. However, significant variation between subgroups suggests diverse roles for HMPV G in different viral lineages.

Area of Science:

  • Virology
  • Molecular Biology
  • Immunology

Background:

  • Human metapneumovirus (HMPV) causes significant acute respiratory illnesses in children.
  • The HMPV G glycoprotein's precise function remains largely undetermined, despite its dispensability for viral replication.
  • Understanding HMPV G diversity is crucial for developing effective antiviral strategies.

Purpose of the Study:

  • To analyze the genetic diversity and evolutionary patterns of the HMPV G glycoprotein over a 20-year period.
  • To investigate structural variations and potential functional implications of HMPV G evolution.
  • To explore the relationship between G sequence conservation and potential functional constraints.

Main Methods:

  • Analysis of 87 full-length HMPV G gene sequences from isolates spanning two decades.
  • Bioinformatic analysis to determine sequence identity, length variation, and structural features (proline content, glycosylation sites).
  • Phylogenetic analysis to estimate the time to the most recent common ancestor and assess evolutionary drift.

Main Results:

  • HMPV G sequences clustered into four distinct subgroups with low inter-subgroup amino acid identity (mean 63%, min 29%).
  • G protein length varied (217-241 residues), with notable differences in proline content and glycosylation sites between subgroups.
  • Minimal genetic drift was observed within subgroups over 20 years, while significant divergence existed between them.
  • The estimated time to the most recent common ancestor for HMPV G was 215 years.

Conclusions:

  • The HMPV G glycoprotein exhibits conserved evolution within specific lineages, suggesting strong functional constraints.
  • Significant divergence between G subgroups implies distinct functional roles or adaptations in different HMPV lineages.
  • Further research is needed to elucidate the specific functions of HMPV G in various viral contexts.

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