Desenvolvimento de metodologias para identificação molecular do HPV
Rocha, Bruno Garcia
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The Human Papiloma Virus (HPV) is a Sexually Transmitted Disease (STD) very common in the world. It infects the human epithelium may persisting of asymptomatic form or causing some neoplasia. Many studies report the association between HPV and many kinds of cancer such as: lap utero, anus, penis, vagina and vulva. According to INCA data for the year of 2016 are expected 16.340 new cases of lap utero cancer, being the second most frequent case in the female population in Brazil. For the recognition of the virus, there`s a lots of tracking methods, as morphological test (pap test), that observes cytopathic effects caused by the virus on human cells, suggesting the existence of infection, however this type of test presents low results and has shown high taxes of false negative and positive results. To overcome this problems, countless studies has shown the effect of molecular techniques utilization to increase the sensibility and especially, getting recognize and genotyping the HPV virus. On this recent studies, were tested distinct molecular techniques for typing the HPV virus, as Conventional PCR followed by Sanger Sequencing , Real time PCR (SYBRGreen® e Taqman ®) and Sequencing of New Generation. Altogether were collected 318 samples pf cervix grated, and from this material were collected the DNA using an adapted protocol (POWELL; GANNON, 2002). Using the conventional PCR technique followed by Sanger Sequencing we obtained 65 positives samples for the HPV(21%), in 49 samples(75,3%) it was possible to identify the HPV type, in the other 16 samples(24,7%) it was not possible the identification, probably because the infection was formed for two or more types of the virus. With the real time PCR technique using SYBRGreen®, were accomplished an experimente with 30 samples, which was possible to confirm the results in 28 of it, using Sanger Sequencing. In two samples the results are not confirmed, being possible to positive the sample, showing high sensibility of the real time PCR technique. The methodology of New Generation Sequencing (NGS) it showed useful for HPV identification, being one of the first studies published for routine use. And it has great prospects because besides HPV can identify other microorganisms in the sample and quantifies them as well.