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Master's Dissertation
DOI
https://doi.org/10.11606/D.42.2003.tde-09122021-121111
Document
Author
Full name
Nancy Alves de Lima Gouvea
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2003
Supervisor
Committee
Diaz, Ricardo Sobhie (President)
Granato, Celso Francisco Hernandes
Vicente, Elisabete Jose
Title in Portuguese
Diversidade genética do HIV-1 em Indivíduos com infecção recente.
Keywords in Portuguese
Diversidade genética do HIV
HIV
Região V3 da GP 120
Abstract in Portuguese
O HIV desenvolve grande diversidade genética (DV) como consequência do escape imune. Análise do HIV durante a infecção recente demonstra sequências relativamente homogêneas genotipicamente e fenotipicamente. O objetivo deste trabalho foi descrever a DV do HIV-1 entre homens vs. mulheres. Foram analisadas cinco amostras de homens e cinco de mulheres, ambos com infecção regente pelo HIV-1. Foi extraído DNA proviral e amplificado por PCR com diluição limitante final para assegurar-se que os amplicons fossem originados de uma única molécula de DNA (clone), sendo obtidos cinco clones de cada amostra. A região V3 da gp120 foi sequenciada e as sequências de nucleotídeos foram alinhadas, traduzidas em aminoácidos e feita filogenia. Foi calculada a DV intra-paciente e estimado o índice de substituições sinônimas e não sinônimas (DS/DN). Foi detectada pequena DV, confirmando a homogeneidade tanto nos homens como nas mulheres (<1%) e o valor da taxa Ds/Dn foi <1. A filogenia demonstrou segregação dos clones em determinados ramos da árvore filogenétiça. Os dados indicam que não existem importantes diferenças na população de vírus transmitidos entre mulheres e homens com relação à DV do HIV-1 na região V3 de brasileiros infectados pelo HIV-1 clade B.
Title in English
Genetic diversity of HIV-1 in individuais with recent infection.
Keywords in English
Genetic diversity of HIV
HIV
HIV infection
Abstract in English
Molecular studies show that although HIV-1 genetic diversity is very small during primary infection (bottleneck transmission), viruses evolve over time presenting a cumulative genetic diversily of 1%/year. A recent study conducted in Africa suggested that viruses present in primary infection in women are more heterogeneous than in men. The objective of this study was to describe the HIV genetic diversity in recently infected males and females in Brazil. Five samples from each males and females were analysed. Purified DNA were subjected to end point PCR for V3 region and sequenced. The analysis of the alignment indicated that there was no genetic diversity in sequentes during this period of infection, confirming the homogeneity in both male and female samples (<1%), and dS/dN value was <1 . Phylogenetic analysis showed segregation of clones in specific branches of the tree. We concluded that there were no important differences in transmitted viruses present in men and women, and a bottleneck does occur in these clade B infected Brazilian group.
 
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Publishing Date
2022-05-17
 
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