International Journal of Current Research and Review
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IJCRR - 7(5), March, 2015

Pages: 24-29

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ANALYSIS OF VIRAL PROTEIN U VARIANT AT AMINO ACID POSITION 61 AMONG THE HETEROSEXUALLY TRANSMITTED HIV-1 PATIENTS OF MANIPUR

Author: Adhikarimayum Lakhikumar Sharma, Thiyam Ramsing Singh, Khuraijam Ranjana Devi, Lisam Shanjukumar Singh

Category: Healthcare

Abstract:Background: Mutation at amino acid position 61 of vpu influences the stability, release and toxicity of the HIV-1. Previously, we have reported that the seryl residue 61 of HIV-1 was mostly conserved among the HIV-1 infected Intravenous Drug Users (IDUs) of Manipur. In this study, we further analyzed the site mutagenesis at seryl residue 61 among the heterosexually transmitted HIV-1 infected individuals of Manipur. Methodology: Heterosexually transmitted HIV-1 infected blood samples from forty eight individuals have been studied by viral amplification and sequencing at vpu gene of HIV-1. Translated amino acid sequences were aligned with reference strain of HIV- 1 for analysis of amino acid variation at position number 61. Phylogenetic tree were also interfered among the studied sample. Results: The results revealed that 91.67% of heterosexually transmitted HIV-1 infected individuals were harboring virus with conserved seryl residue 61 which has viral-enhancement function while only 8.33% harbored mutated virus. Phylogenetic tree of the vpu sequences among the heterosexually transmitted HIV-1 infected individuals of Manipur displayed multiple clusters. Conclusions: Among the heterosexually transmitted HIV-1 infected individuals of Manipur, vpu is highly conserved at amino nacid position 61 with serine (wild-type) which predicts virus to be more virulent. The analysis also indicated that the heterosexually transmitted virus was possibly introduced from multiple sources. The understanding developed on HIV-1 pathogenicity will provide vital information for the policy makers and clinicians for sentinel surveillance of this pandemic and may help the vaccine/ drug developers to design effective anti-HIV-1 therapeutic agents to fight back the deadly AIDS pandemic.

Keywords: HIV, Heterosexual, vpu, Manipur, AIDS, India

Full Text:

INTRODUCTION

HIV/AIDS is a life-threatening disease and remains a threat to all over the world. In India, HIV/AIDS related case was detected for the first time in the year 1986(1). Four year later, in February 1990, the HIV/AIDS was reported in Manipur, a northeastern state of India, for the first time from a blood sample of an intravenous drug user collected on October 1989(2). Since then, Manipur is one of three epicenters of the HIV/AIDS epidemic in India, and arguably the fastest growing. Initially, the progress of HIV epidemic was relatively slow but over the years the number of HIV infected individuals increased and it is a major public health problem now. Manipur is an important gateway of India to “golden triangle” of Southeast Asia, the second largest opium producer in the world where illicit drugs are commonly available(3). Easy available of heroin (locally call as “number four”), an injecting drugs used in Manipur, from the major trafficking route have led to mass uses of these injecting drugs among the youth of this region(4-6). Youths during early 1980’s were commonly addicted to injecting drugs, share injecting equipment and exposing themselves of contracting the deadly virus. The HIV-1 infection was once dominated among IDUs in Manipur(7). In sparsely populated, HIV transmission in Manipur was earlier associated with the sharing of HIV infected needles among the Injecting drug users(8). However, the HIV/AIDS epidemic in Manipur has now penetrated into the general population including children through risk behaviors of IDUs. Manipur, a small state with hardly 0.2% of India’s population, has contributed the highest HIV prevalence approximately 8% of India’s total HIV positive cases(7). According to National AIDS Control Society (NACO) annual report 2013-2014, the epidemiological indices of HIV-1 in this region was estimated to be 1.22% among the adult HIV prevalence and out of 51,583 general clients tested for HIV positive, 1,536 are found to seropositive with HIV-1 (9). The pathogenesis of HIV infection is different from other primate lenti-viruses. It induces immunodeficiency, the pathological hallmark of HIV infection caused by severe depletion of infected as well as uninfected lymphocyte populations. HIV-1 has three main gene gag, pol and env genes along with six accessory gene(10). Vpu gene is one of accessory gene and hallmark features of HIV- 1. Vpu (16-kd, 81-amino acid) is a type I integral membrane protein consisting of a short N-terminal domain, a single transmembrane a-helix domain, two cytosolic α-helices separated by a flexible connector loop, and a short C-terminal tail(11, 12). It has two different biological functions (a) cytoplasmic domain (CTD): degradation of CD4 and (b) transmembrane domain (TMD): enhancement of virion release(13). Moreover, vpu locus is considered as one of the most variable regions in HIV-1 genome. Replacement of serine at position 61 (S61) with alanine was associated with a significant increase in p24 production, confirming that S61 contributes to the viralenhancement function of this particular viral strain(14, 15). Viral releases as well as apoptosis were influenced by mutation at S61 (14, 16). In continuation to our previous mutational study among the IDUs of Manipur(17), the variability of HIV-1 vpu was further investigated among the heterosexually transmitted HIV-1 infected individuals of Manipur.

MATERIAL AND METHODS

Ethics Statement

Written informed consent was obtained from each participant involved in the study. This study was reviewed and approved by Institutional Human Ethical Committee (IHEC), Manipur University (MU) and Regional Institute of Medical Science (RIMS).

Study Subjects

Forty eight heterosexually transmitted HIV-1-positive individuals from Manipur were recruited for the study. Participants were counseled individually and allowed to sign voluntary the informed consent form before the sample collection. All the samples were collected from Regional Institute of Medical Science (RIMS) where the participants from different district of Manipur have been registered at the Anti-retroviral therapy (ART) Centre. All enrolled patients had previously received antiviral treatments. Two milliliters (2ml) of whole blood drawn from each participant’s veins was collected in an EDTA Vacutainer (Becton Dickinson, USA). Blood samples were collected in the year 2012-2013.

DNA Extraction

Peripheral Blood Mononuclear Cells (PBMCs) were separated from whole blood samples by Ficoll–hypaque (GE healthcare, USA) gradient centrifugation method as per manufacturer’s instructions. PBMCs were used to extract genomic DNA using QIAamp DNA blood mini kit (Qiagen GmbH, Germany), according to the manufacturers’ protocol. Genomic DNA was analyzed on 0.8% agarose gel to check the integrity prior to viral gene amplification.

Viral Gene Amplification:

The complete vpu region of HIV-1 genome was amplified from genomic DNA by nested polymerase chain reaction (PCR) technique using high fidelity Taq polymerase (Invitrogen, USA) with forward primer (MUHIVVF1: 5’- AGARGAYAGATGGAACAAGCCCCAG - 3’) and reverse primer (MUHIVVR1: 5’- GTGTGTAGTTCTGCCAATCAGGGAA- 3’) in the first round PCR and forward primer (MUHIVVF2: 5’- TGGAAGCATCCRGGAAGTCAGCCT- 3’) and reverse primer (MUHIVVR2: 5’- GGTACCCCATAATAGACTGTRACCCACAA- 3’) in the second round PCR(18). PCR reactions were carried out in 50µL final volumes containing 250µM dNTPs, 200nM of each primer, 2mM of MgCl2 , 1µg genomic DNA and 6U of Taq polymerase. Cycling parameters were one cycle of denaturation at 94o C for 5 minutes and then add 6U of PCR enzyme as a manual hot-start; followed by 10 cycles of: 94o C for 30s, 60o C for 30s, and 68o C for 45s; then 20 cycles of: 94o C for 30s, 55o C for 30s and 68o C for 45s; one final extension at 68o C for 10 minutes. Identical conditions were used for the pre-nested PCR except for cycling extension for 4mins.

DNA Purification and Sequencing:

The amplified products were electrophoresed onto a 2.0 % agarose gel, stained with ethidium bromide and evaluated under UV light. Desired PCR products were excised and purified for sequencing by using the QIA quick PCR purification kit (Qiagen GmbH, Germany) according to the manufacturer’s protocols. Sequencing of PCR products was performed with an ABI PRISM 3730XL DNA Analyzer using Big Dye terminators (Applied Biosystems, Foster City, California, USA).

Sequence Comparison and Phylogenetic tree construction:

The nucleic acid sequences were analysed using HIV Blast (http://blast.ncbi.nlm.nih.gov/Blast.cgi) to search similarity of the sequences with previously reported ones. The nucleic acid sequences were translated into amino acid sequences and aligned with reference sequences by the ClustalW method under BioEdit software (BioEdit software version 7. 1.11), followed by manual adjustment. Reference sequences were retrieved from the Los Alamos National Laboratory HIV Sequence Database (http://www.hiv.lanl.gov). Phylogenetic analyses were interfered using the Maximum Likelihood tree and method/model based on the Kimura 2-parameter distance matrix and bootstrap method (1000 replicates) of test phylogeny, using MEGA software (Version 6.0).

RESULT

Study Population: In this study, 48 heterosexually transmitted HIV-1-positive patients, including 12 males and 36 females from different district of Manipur, were recruited during 2012- 2013. All the males used in study were infected due to multiple sex partners while all the females used in study were either wives of IDUs or female sex workers (FSWs). All the participants had received antiviral treatments. The median age of the participants was 32 years. 35.42% (17/48) were co-infected with hepatitis B/or C (Table 1).

Origin and Phylogenetic analysis:

According to BLAST similarity search, most of the sequences of vpu regions isolated from heterosexually transmitted HIV-1 infected individuals were found to have the best match with sequences originated from China. The results revealed that 84% (40/48) showed highest similarity score with the HIV-1 variants originated from China, 6% (3/48) were originated from India, 4% (2/48) were originated from Myanmar and 6% (3/48) were originated from other countries Zambia, Kenya (Figure 1). Phylogenetic tree of the vpu sequences among the heterosexually transmitted HIV-1 infected individuals of Manipur displayed multiple clusters (Figure 2). The analysis indicated that the heterosexually transmitted virus was possibly introduced from multiple sources.

VPU variants among the heterosexually transmitted HIV

Among the heterosexually transmitted HIV-1 infected individuals, 91.67% (44/48) were found to be harboring virus with conserved seryl residue at amino acid position 61 of vpu gene while only 8.33% (4/48) were found to harbor virus with mutation at the amino acid position number 61. Four individuals (Sample ID: MU065, MU077, MU106 and MU116) display amino acid substitutions at position number 61 by isoleucine, asparagine, glutamine and proline respectively (Figure 3 and 4).Moreover, due to the extensive polymorphisms the size of the open reading frame (ORF) of vpu variants was differently displayed. Most of them showed unique transmembrane and cytoplasmic deletions which may have functional implications with respect to various vpu mediated functions.

DISCUSSION

Manipur which located near China-Myanmar-India border region is an interesting area for illegal drug trafficking from the “Golden triangle” to other countries/ regions and has very high prevalence of HIV-1 and other viruses (e.g. HCV and HBV)(8, 19). The present study is the continuation of our previous mutational study of vpu to predict the pathogenicity of virus among the HIV- 1 infected population of Manipur(17). The study site shares about 90% of its entire border area with China, Myanmar, Bangladesh, and Bhutan, whereas only about 10% share with mainland India and is one of highest HIV prevalence in the country. The main obstacle to control HIV is due to its ability to accumulate mutations in all its genes in the infected individuals. These mutants are continuously generated and infect new host cells. HIV- 1 encodes a small integral membrane vpu protein and has no homolog HIV-2 virus (less pathogenic)(11, 20). Vpu locus is considered one of the most variable regions in HIV-1 genome and these variations play a major role in controlling viral release as well as apoptosis, both of which are important for HIV-1 pathogenesis. It was previously reported that variation at serine 61 determined the virus pathogenicity by controlling viral release as well as apoptosis. According to published data, seryl residue substitution to alanine at amino acid position 61 in vpu variants showed enhanced intracellular expression and intracellular stability(16). Analysis of vpu sequences among the heterosexually transmitted HIV-1 infected individuals reveal that 91.67% (44/48) harbor virus with highly conserved seryl residue at amino acid position number 61while only 8.33% (4/48) harbors mutated virus with the substitution of serine at amino acid position 61 by isoleucine, asparagine, glutamine and proline. Moreover, our study also suggested that the vpu sequences of HIV found in northeastern region of India were closely similar to HIV- 1 strains of China, mainland India, Myanmar and other countries indicating that heterosexually transmitted virus circulating in Manipur was possibly introduced from multiple sources.

CONCLUSION

The overall finding of this study reveals that among the heterosexually transmitted HIV-1 infected individuals of Manipur, vpu is highly conserved at amino acid position 61 with serine (wild-type) which has been predicted virus to be more virulent. The understanding developed on HIV-1 pathogenicity will provide vital information for the policy makers and clinicians for sentinel surveillance of this pandemic and may help the vaccine/drug developers to design effective anti-HIV-1 therapeutic agents to fight back the deadly AIDS pandemic. Accession Numbers The GenBank accession numbers are KM359881, KM359886, KM359888, KM359870-KM359872, KM359919-KM359928 and KM359930-KM359960.

Ethical: Institutional Human ethical committee (IHEC) (Reference no- Ac/112/EC/RIMS/2005 of 25th July 2010) by Regional Institute of Medical Science (RIMS) and Manipur University (MU) approved this study.

Conflict of interest: The authors declare that there are no conflicts of interest. Authors’

Contributions: ALS carried out the molecular biology work and subsequent analysis; KRD provided the samples; LSS and TRS conceived, designed and supervised the study. All authors have approved the final manuscript.

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A Study by Siti Sarah Binti Maidin entitled "Sleep Well: Mobile Application to Address Sleeping Problems" is awarded Best Article for Vol 12 issue 20
A Study by Avijit Singh"Comparison of Post Operative Clinical Outcomes Between “Made in India” TTK Chitra Mechanical Heart Valve Versus St Jude Mechanical Heart Valve in Valve Replacement Surgery" is awarded Best Article for Vol 12 issue 19
A Study by Sonali Banerjee and Mary Mathews N. entitled "Exploring Quality of Life and Perceived Experiences Among Couples Undergoing Fertility Treatment in Western India: A Mixed Methodology" is awarded Best Article for Vol 12 issue 18
A Study by Jabbar Desai et al. entitled "Prevalence of Obstructive Airway Disease in Patients with Ischemic Heart Disease and Hypertension" is awarded Best Article for Vol 12 issue 17
A Study by Juna Byun et al. entitled "Study on Difference in Coronavirus-19 Related Anxiety between Face-to-face and Non-face-to-face Classes among University Students in South Korea" is awarded Best Article for Vol 12 issue 16
A Study by Sudha Ramachandra & Vinay Chavan entitled "Enhanced-Hybrid-Age Layered Population Structure (E-Hybrid-ALPS): A Genetic Algorithm with Adaptive Crossover for Molecular Docking Studies of Drug Discovery Process" is awarded Best article for Vol 12 issue 15
A Study by Varsha M. Shindhe et al. entitled "A Study on Effect of Smokeless Tobacco on Pulmonary Function Tests in Class IV Workers of USM-KLE (Universiti Sains Malaysia-Karnataka Lingayat Education Society) International Medical Programme, Belagavi" is awarded Best article of Vol 12 issue 14, July 2020
A study by Amruta Choudhary et al. entitled "Family Planning Knowledge, Attitude and Practice Among Women of Reproductive Age from Rural Area of Central India" is awarded Best Article for special issue "Modern Therapeutics Applications"
A study by Raunak Das entitled "Study of Cardiovascular Dysfunctions in Interstitial Lung Diseas epatients by Correlating the Levels of Serum NT PRO BNP and Microalbuminuria (Biomarkers of Cardiovascular Dysfunction) with Echocardiographic, Bronchoscopic and HighResolution Computed Tomography Findings of These ILD Patients" is awarded Best Article of Vol 12 issue 13 
A Study by Kannamani Ramasamy et al. entitled "COVID-19 Situation at Chennai City – Forecasting for the Better Pandemic Management" is awarded best article for  Vol 12 issue 12
A Study by Muhammet Lutfi SELCUK and Fatma entitled "Distinction of Gray and White Matter for Some Histological Staining Methods in New Zealand Rabbit's Brain" is awarded best article for  Vol 12 issue 11
A Study by Anamul Haq et al. entitled "Etiology of Abnormal Uterine Bleeding in Adolescents – Emphasis Upon Polycystic Ovarian Syndrome" is awarded best article for  Vol 12 issue 10
A Study by entitled "Estimation of Reference Interval of Serum Progesterone During Three Trimesters of Normal Pregnancy in a Tertiary Care Hospital of Kolkata" is awarded best article for  Vol 12 issue 09
A Study by Ilona Gracie De Souza & Pavan Kumar G. entitled "Effect of Releasing Myofascial Chain in Patients with Patellofemoral Pain Syndrome - A Randomized Clinical Trial" is awarded best article for  Vol 12 issue 08
A Study by Virendra Atam et. al. entitled "Clinical Profile and Short - Term Mortality Predictors in Acute Stroke with Emphasis on Stress Hyperglycemia and THRIVE Score : An Observational Study" is awarded best article for  Vol 12 issue 07
A Study by K. Krupashree et. al. entitled "Protective Effects of Picrorhizakurroa Against Fumonisin B1 Induced Hepatotoxicity in Mice" is awarded best article for issue Vol 10 issue 20
A study by Mithun K.P. et al "Larvicidal Activity of Crude Solanum Nigrum Leaf and Berries Extract Against Dengue Vector-Aedesaegypti" is awarded Best Article for Vol 10 issue 14 of IJCRR
A study by Asha Menon "Women in Child Care and Early Education: Truly Nontraditional Work" is awarded Best Article for Vol 10 issue 13
A study by Deep J. M. "Prevalence of Molar-Incisor Hypomineralization in 7-13 Years Old Children of Biratnagar, Nepal: A Cross Sectional Study" is awarded Best Article for Vol 10 issue 11 of IJCRR
A review by Chitra et al to analyse relation between Obesity and Type 2 diabetes is awarded 'Best Article' for Vol 10 issue 10 by IJCRR. 
A study by Karanpreet et al "Pregnancy Induced Hypertension: A Study on Its Multisystem Involvement" is given Best Paper Award for Vol 10 issue 09

List of Awardees

A Study by Ese Anibor et al. "Evaluation of Temporomandibular Joint Disorders Among Delta State University Students in Abraka, Nigeria" from Vol 13 issue 16 received Emerging Researcher Award


A Study by Alkhansa Mahmoud et al. entitled "mRNA Expression of Somatostatin Receptors (1-5) in MCF7 and MDA-MB231 Breast Cancer Cells" from Vol 13 issue 06 received Emerging Researcher Award


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International Journal of Current Research and Review (IJCRR) provides platform for researchers to publish and discuss their original research and review work. IJCRR can not be held responsible for views, opinions and written statements of researchers published in this journal

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