Distribution and heterogeneity of hepatitis C genotypes in hepatitis patients in Cameroon

Area of Science:

• Virology
• Genetics
• Epidemiology

Background:

• Hepatitis C virus (HCV) infection is a global health concern with significant genetic variability.
• HCV prevalence is notably high in Central Africa, particularly in Cameroon.
• Previous studies identified HCV genotypes 1, 2, and 4 in Cameroon, but detailed genetic distribution remained unclear.

Purpose of the Study:

• To delineate the distribution and genetic diversity of Hepatitis C virus genotypes and subtypes in Cameroonian patients.
• To analyze the phylogenetic relationships between different HCV regions (NS5b and E2).
• To investigate the influence of host factors (age, gender) on HCV genotype distribution.

Main Methods:

• Sequencing of the NS5b and E2 regions from 156 HCV isolates from patients in Yaounde, Cameroon.
• Phylogenetic analysis to determine HCV genotype and subtype clustering.
• Comparison of sequence data to identify genetic variability and concordance between regions.

Main Results:

• HCV genotype 1 was the most prevalent, followed by genotypes 4 and 2.
• Genotypes 1 and 4 exhibited significant heterogeneity, encompassing numerous known and unknown subtypes.
• A consistent phylogenetic concordance was observed between NS5b and E2 sequence data, while genotype 2 sequences showed minimal variation.
• No correlation was found between patient age or gender and HCV genotype distribution.

Conclusions:

• HCV genotypes 1 and 4 in Cameroon are characterized by extensive genetic diversity, likely reflecting ancient introduction and evolution.
• The homogeneity of HCV genotype 2 suggests a more recent introduction into the region, possibly from Western Africa.
• Phylogenetic analysis of NS5b and E2 regions provides a reliable method for characterizing HCV genetic diversity.