Genomic polymorphism of human papillomavirus type 52 in women from Northeast China.

Human papillomavirus (HPV) 52 is an oncogenic HPV type prevalent in Asia. The aim of the study was to analyze HPV 52 genetic variations in women from Northeast China. To explore the intratypic variants of HPV 52, the genomic regions of L1, E6, E7 and long control region (LCR) of HPV 52, which have been identified in women from Northeast China by HPV GenoArray test, were analyzed. Twenty-five mutations were identified in the regions examined. Of the mutations found in the L1 gene, three novel nonsynonymous mutations of C5640T, A5641T and G5642A were located within the region that encodes the binding domain of neutralizing antibodies against HPV 52. Although four variations were identified in HPV 52 E6 and E7 genes, no significant association was found between the mutations and the cytological lesion of the patients. Eight mutations, including a novel CTT7681−7683 deletion, found in the LCR of HPV 52 encompassed the known transcription binding sites, which may possibly affect the transcription of the oncogenic genes of E6 and E7. The most prevalent HPV 52 variant in women from northeastern China belongs to clade L1-LN-A. The genetic variations of HPV 52, including three novel nonsynonymous mutations of C5640T, A5641T and G5642A in the L1 gene and a novel CTT7681−7683 deletion in the LCR, were first documented in strains from women in Northeast China. The statistical result showed no associations between the variants and the severities of the infected women. These findings provide new data regarding gene variations of HPV 52.