Nucleotide sequence of human influenza A/PR/8/34 segment 2

Area of Science:

• Virology
• Molecular Biology
• Genomics

Background:

• Human influenza A virus relies on segmented RNA genomes for replication.
• Understanding individual RNA segments is key to deciphering viral functions.
• Previous studies characterized other influenza segments, but segment 2 remained unsequmented.

Purpose of the Study:

• To determine the complete nucleotide sequence of RNA segment 2 from the human influenza strain A/PR/8/34.
• To identify the encoded protein and its potential role in viral RNA synthesis.
• To compare segment 2 with segment 1 for sequence homology and functional relatedness.

Main Methods:

• RNA sequencing of influenza virus segment 2.
• Bioinformatic analysis of nucleotide and amino acid sequences.
• Comparative sequence analysis with influenza RNA segment 1.

Main Results:

• The nucleotide sequence of RNA segment 2 (2341 nucleotides) was fully determined.
• Segment 2 encodes a protein of 757 amino acids (86.5 kDa) involved in RNA synthesis.
• Despite similar size and function to segment 1, RNA segment 2 showed no nucleotide or amino acid homology with segment 1.
• The determined sequence completed the full genomic sequence of the influenza A/PR/8/34 strain.

Conclusions:

• The complete sequence of RNA segment 2 provides crucial data for understanding influenza virus replication.
• The lack of homology between segment 2 and segment 1 suggests distinct evolutionary paths or functional specializations.
• This work contributes to the comprehensive genomic understanding of human influenza A virus.