Recombinant identification, molecular classification and proposed reference genomes for hepatitis delta virus

Area of Science:

• Virology
• Genetics
• Epidemiology

Background:

• Hepatitis delta virus (HDV) co-infects with hepatitis B virus (HBV), posing a significant and increasing global health burden.
• The genetic diversity and molecular classification of HDV are not fully understood, hindering comprehensive research and management.

Purpose of the Study:

• To systematically analyze HDV full-length genome sequences to update its classification.
• To identify novel HDV recombinants and map the global distribution of genotypes and subtypes.
• To establish a comprehensive set of reference genomes and propose criteria for future HDV classification.

Main Methods:

• Systematic retrieval and analysis of a large dataset of full-length HDV genome sequences.
• Phylogenetic and genetic analyses to establish an updated classification system, excluding recombinants.
• Mapping the global distribution of identified HDV genotypes and subtypes.

Main Results:

• Identification of novel HDV recombinants.
• Establishment of an updated HDV classification system based on phylogenetic and genetic analyses (excluding recombinants).
• Compilation of a complete set of reference genomes for each subtype and proposed criteria for new genotype/subtype identification.

Conclusions:

• The study provides an updated classification system for HDV and reference genomes, crucial for understanding its epidemiology and evolution.
• The global distribution map highlights limitations in current HDV genetic data, indicating the need for further data collection.
• The findings will support future research in HDV diagnosis, screening, epidemiology, evolution, prevention, and clinical management.