@article {10495, title = {Antiretroviral Treatment in HIV-1-Positive Mothers: Neurological Implications in Virus-Free Children.}, journal = {Int J Mol Sci}, volume = {18}, year = {2017}, month = {2017 Feb 15}, abstract = {

Since the worldwide introduction of antiretroviral therapy (ART) in human immunodeficiency virus type 1, HIV-1-positive mothers, together with HIV-1 testing prior to pregnancy, caesarian birth and breastfeeding cessation with replacement feeding, a reduction of HIV-1 mother-to-child transmission (MTCT) has been observed in the last few years. As such, an increasing number of children are being exposed in utero to ART. Several questions have arisen concerning the neurological effects of ART exposure in utero, considering the potential effect of antiretroviral drugs on the central nervous system, a structure which is in continuous development in the fetus and characterized by great plasticity. This review aims at discussing the possible neurological impairment of children exposed to ART in utero, focusing attention on the drugs commonly used for HIV-1 MTCT prevention, clinical reports of ART neurotoxicity in children born to HIV-1-positive mothers, and neurologic effects of protease inhibitors (PIs), especially ritonavir-"boosted" lopinavir (LPV/r) in cell and animal central nervous system models evaluating the potential neurotoxic effect of ART. Finally, we present the findings of a meta-analysis to assess the effects on the neurodevelopment of children exposed to ART in utero.

}, keywords = {Animals, Anti-HIV Agents, Antiretroviral Therapy, Highly Active, Disease Management, Disease Models, Animal, Epigenesis, Genetic, Female, HIV Infections, HIV-1, Humans, Infectious Disease Transmission, Vertical, Maternal Exposure, Meta-Analysis as Topic, Mothers, Neurodevelopmental Disorders, Pregnancy, Prenatal Exposure Delayed Effects}, issn = {1422-0067}, doi = {10.3390/ijms18020423}, author = {Coelho, Ant{\^o}nio Victor Campos and Tricarico, Paola Maura and Celsi, Fulvio and Crovella, Sergio} } @article {8480, title = {Frequency of the CCR5-delta32 allele in Brazilian populations: A systematic literature review and meta-analysis.}, journal = {Infect Genet Evol}, volume = {43}, year = {2016}, month = {2016 Sep}, pages = {101-7}, abstract = {

The CCR5 is a chemokine receptor widely expressed by several immune cells that are engaged in inflammatory responses. Some populations have individuals exhibiting a 32bp deletion in the CCR5 gene (CCR5-delta32) that produces a truncated non-functional protein not expressed on the cell surface. This polymorphism, known to be associated with susceptibility to infectious and inflammatory diseases, such as osteomyelitis, pre-eclampsia, systemic lupus erythematous, juvenile idiopathic arthritis, rheumatoid arthritis and HIV/AIDS, is more commonly found in European populations with average frequency of 10\%. However, it is also possible to observe a significant frequency in other world populations, such as the Brazilian one. We performed a systematic review and meta-analysis of CCR5-delta32 genetic association studies in Brazilian populations throughout the country to estimate the frequency of this polymorphism. We also compared CCR5-delta32 frequencies across Brazilian regions. The systematic literature reviewed studies involving delta32 allele in Brazilian populations published from 1995 to 2015. Among the reviewed literature, 25 studies including 30 Brazilian populations distributed between the North, Northeast, South and Southeast regions were included in our meta-analysis. We observed an overall allelic frequency of 4\% (95\%-CI, 0.03-0.05), that was considered moderate and, notably, higher than some European populations, such as Cyprus (2.8\%), Italy (3\%) and Greece (2.4\%). Regarding the regional frequency comparisons between North-Northeast (N-NE) and South-Southeast (S-SE) regions, we observed an allelic frequency of 3\% (95\%-CI, 0.02-0.04) and 4\% (95\%-CI, 0.03-0.05), respectively. The populations from S-SE regions had a slightly higher CCR5-delta32 frequency than N-NE regions (OR=1.41, p=0.002). Although there are several studies about the CCR5-delta32 polymorphism and its effect on the immune response of some infectious diseases, this report is the first meta-analysis study that provides a descriptive study of the distribution of CCR5-delta32 allele in Brazilian population.

}, issn = {1567-7257}, doi = {10.1016/j.meegid.2016.05.024}, author = {Silva-Carvalho, Wlisses Henrique Veloso and De Moura, Ronald Rodrigues and Coelho, Ant{\^o}nio Victor Campos and Crovella, Sergio and Guimar{\~a}es, Rafael Lima} } @article {8521, title = {TRIM5 gene polymorphisms in HIV-1-infected patients and healthy controls from Northeastern Brazil.}, journal = {Immunol Res}, year = {2016}, month = {2016 Jul 8}, abstract = {

Humans show heterogeneity in vulnerability to HIV-1 infection, partially under control of genes involved in host immunity and virus replication. TRIM5α protein has restriction activity against replication of many retroviruses. Human TRIM5 gene single nucleotide polymorphisms have been reported as involved in susceptibility to HIV-1 infection. We recruited 213 HIV-1-positive patients and 234 healthy uninfected controls from Northeast Brazil; two non-synonymous variants at exon 2, rs3740996 (H43Y) and rs10838525 (R136Q), and one regulatory polymorphism (rs16934386) at 5{\textquoteright}UTR region of TRIM5 were analyzed. The R136Q variation presented significant differences between HIV-1-positive patients and healthy controls. The 136Q allele and the 136QQ genotype were more frequent in healthy controls (32.7 and 10.2~\%, respectively) than in HIV-1-positive patients (136Q allele: 24.4~\%; OR 0.66; CI 95~\% 0.49-0.90; p value~=~0.008/136QQ genotype: 4.2~\%; OR 0.33; CI 95~\% 0.13-0.79, p~=~0.008) also after adjusting for age and sex. We also stratified our findings according to the presence of CCR5Δ32 variation, but the results remained the same. We observed that rs10838525 (R136Q) and rs3740996 (H43Y) were in linkage disequilibrium (D{\textquoteright}~=~0.71), forming four possible haplotypes. The H43-136Q haplotype was significantly more frequent in healthy controls (28.2~\%) than in HIV-positive patients (21.4~\%; OR 0.69; CI 95~\% 0.50-0.96; p~=~0.022). An increased frequency of allele (136Q) and genotype (136QQ) of the non-synonymous rs10838525 (R136Q) variant and the haplotype (43H-136Q) was observed among healthy controls individuals. Being aware of the limitation of this study (unavailability of exposed but uninfected individuals), we hypothesize a potential role for TRIM5 variations in the protection against HIV-1 infection.

}, issn = {1559-0755}, doi = {10.1007/s12026-016-8810-1}, author = {Celerino da Silva, Ronaldo and Coelho, Ant{\^o}nio Victor Campos and Arraes, Luiz Claudio and Brand{\~a}o, Lucas Andr{\'e} Cavalcanti and Crovella, Sergio and Guimar{\~a}es, Rafael Lima} } @article {7683, title = {Lactotransferrin gene functional polymorphisms do not influence susceptibility to human immunodeficiency virus-1 mother-to-child transmission in different ethnic groups.}, journal = {Mem Inst Oswaldo Cruz}, volume = {110}, year = {2015}, month = {2015 Apr}, pages = {222-9}, abstract = {

Lactotransferrin, also known as lactoferrin, is an iron binding glycoprotein that displays antiviral activity against many different infectious agents, including human immunodeficiency virus (HIV)-1. Lactotransferrin is present in the breast milk and in the female genitourinary mucosa and it has been hypothesised as a possible candidate to prevent mother-to-child HIV-1 transmission. To verify if two functional polymorphisms, Thr29Ala and Arg47Lys, in the lactotransferrin encoding gene (LTF) could affect HIV-1 infection and vertical transmission, a preliminary association study was performed in 238 HIV-1 positive and 99 HIV-1 negative children from Brazil, Italy, Africa and India. No statistically significant association for the Thr29Ala and Arg47Lys LTF polymorphisms and HIV-1 susceptibility in the studied populations was found. Additionally LTF polymorphisms frequencies were compared between the four different ethnic groups.

}, keywords = {Acquired Immunodeficiency Syndrome, Adolescent, Brazil, Child, Cohort Studies, Ethnic Groups, Female, Gene Frequency, Genetic Predisposition to Disease, Genotyping Techniques, HIV-1, Humans, India, Infant, Newborn, Infectious Disease Transmission, Vertical, Italy, Lactoferrin, Male, Polymorphism, Single Nucleotide, Real-Time Polymerase Chain Reaction, Retrospective Studies, Zimbabwe}, issn = {1678-8060}, doi = {10.1590/0074-02760140447}, author = {Zupin, Luisa and Polesello, Vania and Coelho, Ant{\^o}nio Victor Campos and Boniotto, Michele and Arraes, Luiz Claudio and Segat, Ludovica and Crovella, Sergio} } @article {7750, title = {Meta-analysis and time series modeling allow a systematic review of primary HIV-1 drug-resistant prevalence in Latin America and Caribbean.}, journal = {Curr HIV Res}, volume = {13}, year = {2015}, month = {2015}, pages = {125-42}, abstract = {

Here we review the prevalence of HIV-1 primary drug resistance in Latin America and Caribbean using meta-analysis as well as time-series modeling. We also discuss whether there could be a drawback to HIV/AIDS programs due to drug resistance in Latin America and Caribbean in the next years. We observed that, although some studies report low or moderate primary drug resistance prevalence in Caribbean countries, this evidence needs to be updated. In other countries, such as Brazil and Argentina, the prevalence of drug resistance appears to be rising. Mutations conferring resistance against reverse transcriptase inhibitors were the most frequent in the analyzed populations (70\% of all mutational events). HIV-1 subtype B was the most prevalent in Latin America and the Caribbean, although subtype C and B/F recombinants have significant contributions in Argentina and Brazil. Thus, we suggest that primary drug resistance in Latin America and the Caribbean could have been underestimated. Clinical monitoring should be improved to offer better therapy, reducing the risk for HIV-1 resistance emergence and spread, principally in vulnerable populations, such as men who have sex with men transmission group, sex workers and intravenous drug users.

}, issn = {1873-4251}, author = {Coelho, Ant{\^o}nio Victor Campos and De Moura, Ronald Rodrigues and da Silva, Ronaldo Celerino and Kamada, Anselmo Jiro and Guimar{\~a}es, Rafael Lima and Brand{\~a}o, Lucas Andr{\'e} Cavalcanti and Coelho, Hem{\'\i}lio Fernandes Campos and Crovella, Sergio} } @article {7770, title = {Meta-analysis of Brazilian genetic admixture and comparison with other Latin America countries.}, journal = {Am J Hum Biol}, volume = {27}, year = {2015}, month = {2015 Sep-Oct}, pages = {674-80}, abstract = {

OBJECTIVES: This study aims at performing a systematic review and meta-analysis with the studies of genetic admixture inference of Brazilian population and to compare these results with the genetic admixture levels in other Latin American countries.

METHODS: We searched for articles regarding the estimation of Brazilian genetic admixture published between 1980 and 2014 that used autosomal markers. Then, conducted meta-analyses at the whole-country and regional level. Finally, we compared the results of Brazil with other estimates from other South, Central and North American countries.

RESULTS: We analyzed data from 25 studies in 38 different Brazilian populations. European (EUR) ancestry is the major contributor to the genetic background of Brazilians, followed by African (AFR), and Amerindian (AMR) ancestries. The pooled ancestry contributions were 0.62 EUR, 0.21 AFR, and 0.17AMR. The Southern region had a greater EUR contribution (0.77) than other regions. Individuals from the Northeast (NE) region had the highest AFR contribution (0.27) whereas individuals from the North regions had more AMR contribution (0.32). In the Latin America context, Brazil has the 5th high EUR contribution, the 12th for the AFR component and the 10th for the AMR ancestry.

CONCLUSIONS: Admixture proportions vary greatly among Brazilian populations and also through Latin America. More studies in the Center-West, North and NE regions are needed to capture a more complete picture of the genomic ancestry of Brazil.

}, issn = {1520-6300}, doi = {10.1002/ajhb.22714}, author = {Moura, Ronald Rodrigues de and Coelho, Ant{\^o}nio Victor Campos and Balbino, Valdir de Queiroz and Crovella, Sergio and Brand{\~a}o, Lucas Andr{\'e} Cavalcanti} } @article {3623, title = {DEFB1 polymorphisms are involved in susceptibility to human papillomavirus infection in Brazilian gynaecological patients.}, journal = {Mem Inst Oswaldo Cruz}, volume = {109}, year = {2014}, month = {2014 Nov}, pages = {918-22}, abstract = {

The human beta defensin 1 (hBD-1) antimicrobial peptide is a member of the innate immune system known to act in the first line of defence against microorganisms, including viruses such as human papillomavirus (HPV). In this study, five functional polymorphisms (namely g-52G>A, g-44C>G and g-20G>A in the 5{\textquoteright}UTR and c.*5G>A and c.*87A>G in the 3{\textquoteright}UTR) in the DEFB1 gene encoding for hBD-1 were analysed to investigate the possible involvement of these genetic variants in susceptibility to HPV infection and in the development of HPV-associated lesions in a population of Brazilian women. The DEFB1 g-52G>A and c.*5G>A single-nucleotide polymorphisms (SNPs) and the GCAAA haplotype showed associations with HPV-negative status; in particular, the c.*5G>A SNP was significantly associated after multiple test corrections. These findings suggest a possible role for the constitutively expressed beta defensin-1 peptide as a natural defence against HPV in the genital tract mucosa.

}, keywords = {Adolescent, Adult, Aged, beta-Defensins, Brazil, Case-Control Studies, Female, Genetic Predisposition to Disease, Haplotypes, Humans, Middle Aged, Papillomavirus Infections, Polymorphism, Single Nucleotide, Reproductive Tract Infections, Young Adult}, issn = {1678-8060}, author = {Segat, Ludovica and Zupin, Luisa and Moura, Ronald Rodrigues and Coelho, Ant{\^o}nio Victor Campos and Chagas, B{\'a}rbara Simas and de Freitas, Antonio Carlos and Crovella, Sergio} } @article {1746, title = {Mannose binding lectin gene (MBL2) functional polymorphisms are associated with systemic lupus erythematosus in southern Brazilians.}, journal = {Hum Immunol}, volume = {72}, year = {2011}, month = {2011 Jun}, pages = {516-21}, abstract = {

Susceptibility to systemic lupus erythematosus (SLE) has been associated with immunologic, environmental, and genetic factors. To uncover a possible association between MBL2 gene polymorphisms and SLE, we analyzed functional polymorphisms in the promoter and first exon of the MBL2 gene in 134 Brazilian SLE patients and 101 healthy controls. Genotype and allele frequencies of MBL2 A/O polymorphism were significantly different between patients and controls, and the O allele was associated with an increased risk of SLE. An association between low mannose binding lectin (MBL) producer combined genotypes and increased risk for SLE was also reported. Furthermore, when stratifying SLE patients according to clinical and laboratory data, an association between the A/O genotype and nephritic disorders and between the X/Y genotype and antiphospholipid syndrome was evident. Combined genotypes responsible for low MBL production were more frequently observed in SLE patients with nephritis. Our results indicate MBL2 polymorphisms as possible risk factors for SLE development and disease-related clinical manifestations.

}, keywords = {Adolescent, Adult, Aged, Brazil, DNA Mutational Analysis, Female, Gene Frequency, Genetic Association Studies, Genetic Predisposition to Disease, Genotype, Humans, Lupus Erythematosus, Systemic, Male, Mannose-Binding Lectin, Middle Aged, Polymorphism, Genetic, Population Groups, Promoter Regions, Genetic}, issn = {1879-1166}, doi = {10.1016/j.humimm.2011.03.007}, author = {Sandrin-Garcia, Paula and Brand{\~a}o, Lucas Andr{\'e} Cavalcanti and Coelho, Ant{\^o}nio Victor Campos and Guimar{\~a}es, Rafael Lima and Pancoto, Jo{\~a}o Alexandre Tr{\'e}s and Segat, Ludovica and Donadi, Eduardo Ant{\^o}nio and de Lima-Filho, Jos{\'e} Luiz and Crovella, Sergio} }