It has been shown that Human papillomavirus (HPV) infection is associated with several forms of cancer. Additionally, although there are more than 100 types of HPV, more than ten types of it, including types 16 and 18, are considered high-risk. The two proteins that make up the viral capsid of HPV 16 are L1, the major capsid protein, and L2, the minor capsid protein. FDA (The Food and Drug Administration) approved HPV vaccines mostly target L1 and L2 capsid proteins, which facilitate intracellular entry during infection. In this study, it was set out to analyze the creation of phylogenetic relations of L1 nucleic acid sequences of viral isolates. This study also analyzed sequences of three key elements within the amino acid sequences of HPV 16 L1: loops critical for structural stability, nuclear localization signal sequences, and residues implicated in viral attachment. As highlighted by the literature, these elements represent pivotal aspects of viral function. Furthermore, the report highlighted the particular inter-sequence variability within the HPV 16 L1 protein sequences. Overall analysis revealed clustering of sequences primarily due to geographical and characterized by more phylogenetic relatedness within location-specific clusters.

Human papillomavirus (HPV) infection is a leading cause of several cancers, with types 16 and 18 classified as high-risk. This study investigates the L1 capsid protein of HPV16, a crucial target for Food Drug and Administration-approved vaccines, by analyzing its nucleic acid and amino acid sequences to identify phylogenetic relationships, sequence variations, and conserved functional elements. The study utilizes sequences obtained from the National Center for Biotechnology Information virus database to assess geographical clustering and evolutionary trends. Key regions, including structural loops, nuclear localization signals, and viral attachment sites, were examined for variability. Phylogenetic analysis demonstrated distinct clustering patterns, particularly among sequences from Japan and Pakistan, indicating potential regional influences on HPV-16 evolution. Despite observed sequence variability, critical residues essential for viral entry remained conserved, suggesting evolutionary constraints on functionally significant domains. These findings offer insights into HPV-16 diversity in Asia and highlight the importance of continuous genomic surveillance for vaccine development and epidemiological assessments.