High frequency of HPV16 European variant E350G among Mexican women from Sinaloa
Elisa Anali Camacho-Ureta1, Rocío Susana Mendez-Martínez2, Salvador Vázquez-Vega3, Ulises Osuna Martínez1, Rosalinda Sánchez Arenas3, Hipólito Castillo-Ureta4, Ignacio Osuna Ramírez1, Edith Hilario Torres Montoya4, Héctor Samuel López Moreno1, Alejandro García-Carranca5, José Guadalupe Rendón-Maldonado1
1 Faculty of Chemical and Biological Sciences, Autonomous University of Sinaloa, Culiacan, Mexico
2 Faculty of Chemical and Biological Sciences, Autonomous University of Sinaloa, Culiacan; Laboratory of Virus & Cancer, Instituto Nacional de Cancerología, SS, Mexico City, Mexico
3 Unit of Epidemiological Research and Health Services SXXI, Centro Médico Nacional, Mexico City, Mexico
4 Faculty of Biology, Autonomous University of Sinaloa, Culiacan, Mexico
5 Laboratory of Virus & Cancer, Instituto Nacional de Cancerología, SS; Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Mexico City, Mexico
Dr José Guadalupe Rendón-Maldonado
Faculty of Chemical and Biological Sciences, Autonomous University of Sinaloa, Av. de las Americas y Blvd. Universitarios S/N, Ciudad Universitaria, Culiacan, Sinaloa
Source of Support: None, Conflict of Interest: None
Background & objectives: Human papillomavirus (HPV) infections play a crucial role in the aetiology of cervical cancer (CC), and HPV16 is the primary viral genotype associated with CC. A number of variants of the HPV16 E6 gene are involved in the progression of CC, differing in their prevalence and biological and biochemical properties. This study was designed to determine the frequency of HPV types 16/18 and to identify the presence of HPV16 E6-variants in asymptomatic Mexican women.
Methods: A total of 189 cervical Pap smears were collected from women attending public health services in three different cities in Sinaloa, Mexico. Viral DNA was identified by amplification of E6 viral gene fragments using polymerase chain reaction (PCR). Identification of variants was done by sequencing a DNA fragment (321bp) of the HPV16 E6 gene.
Results: More than half of the women tested were HPV-positive (52.38%), with HPV16 being the most frequent genotype (21.16%), followed by HPV18 (8.99%). Sequence analysis of the E6-HPV16 PCR products showed that in all cases, the viruses corresponded to European variants. It was further observed that the E350G intra-variant was the most common (>76%).
Interpretation & conclusions: This study showed a predominance of European lineage variants of HPV16 among asymptomatic women from Sinaloa, Mexico, predominantly with of the E350G variant. This variant has been shown to be associated with an increased risk of early development of CC. The use of molecular identification of carcinogenic HPV and Pap test screening may be a good strategy for monitoring women to prevent CC.