Genome sequence of a measles virus strain with a novel loss of stop codon mutation in the phosphoprotein gene

Area of Science:

• Virology
• Molecular Biology
• Genetics

Background:

• Measles virus (MeV) is a highly contagious pathogen responsible for significant global morbidity and mortality.
• The phosphoprotein (P) gene is crucial for MeV replication and transcription.
• Genotyping of MeV is essential for tracking viral spread and understanding evolutionary dynamics.

Purpose of the Study:

• To analyze the complete genome sequence of a Measles virus genotype B3 strain from a 2019 case.
• To identify and characterize novel mutations within the MeV genome, specifically in the phosphoprotein (P) gene.
• To investigate the potential functional implications of identified mutations on the P protein.

Main Methods:

• Whole-genome sequencing of the Measles virus B3 strain.
• Bioinformatic analysis to identify genetic variations, including mutations and stop codon alterations.
• Comparative analysis of the mutated P gene sequence against wild-type strains.

Main Results:

• A coding-complete genome sequence of Measles virus genotype B3 was obtained from a 2019 isolate.
• A novel mutation was identified in the phosphoprotein (P) gene, leading to the abrogation of an established stop codon.
• A downstream stop codon was found, predicting a putative P protein 19 amino acids longer than the wild-type.

Conclusions:

• The discovery of a novel mutation in the MeV P gene provides new insights into MeV genome variability.
• The extended P protein resulting from this mutation may have altered functions, potentially affecting viral pathogenesis or replication.
• Further studies are warranted to elucidate the functional consequences of this P protein elongation in Measles virus.