1
|
Suominen NT, Roger M, Faucher MC, Syrjänen KJ, Grénman SE, Syrjänen SM, Louvanto K. HLA-G Alleles Impact the Perinatal Father-Child HPV Transmission. Curr Issues Mol Biol 2023; 45:5798-5810. [PMID: 37504282 PMCID: PMC10378566 DOI: 10.3390/cimb45070366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2023] [Revised: 07/09/2023] [Accepted: 07/11/2023] [Indexed: 07/29/2023] Open
Abstract
The host factors that influence father-to-child human papillomavirus (HPV) transmission remain unknown. This study evaluated whether human leukocyte antigen (HLA)-G alleles are important in father-to-child HPV transmission during the perinatal period. Altogether, 134 father-newborn pairs from the Finnish Family HPV Study were included. Oral, semen and urethral samples from the fathers were collected before the delivery, and oral samples were collected from their offspring at delivery and postpartum on day 3 and during 1-, 2- and 6-month follow-up visits. HLA-G alleles were tested by direct sequencing. Unconditional logistic regression was used to determine the association of the father-child HLA-G allele and genotype concordance with the father-child HPV prevalence and concordance at birth and during follow-up. HLA-G allele G*01:01:03 concordance was associated with the father's urethral and child's oral high-risk (HR)-HPV concordance at birth (OR 17.00, 95% CI: 1.24-232.22). HLA-G allele G*01:04:01 concordance increased the father's oral and child's postpartum oral any- and HR-HPV concordance with an OR value of 7.50 (95% CI: 1.47-38.16) and OR value of 7.78 (95% CI: 1.38-43.85), respectively. There was no association between different HLA-G genotypes and HPV concordance among the father-child pairs at birth or postpartum. To conclude, the HLA-G allele concordance appears to impact the HPV transmission between the father and his offspring.
Collapse
Affiliation(s)
- Nelli T Suominen
- Department of Obstetrics and Gynecology, Turku University Hospital, University of Turku, 20520 Turku, Finland
- Department of Obstetrics and Gynecology, Vaasa Central Hospital, 65130 Vaasa, Finland
| | - Michel Roger
- Département de Microbiologie et d'Immunologie et Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CHUM), Montreal, QC H2X 0A9, Canada
- Department of Microbiology, Infectious Diseases and Immunology, University of Montreal, Montreal, QC H3T 1J4, Canada
| | - Marie-Claude Faucher
- Département de Microbiologie et d'Immunologie et Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CHUM), Montreal, QC H2X 0A9, Canada
| | - Kari J Syrjänen
- Department of Clinical Research, Biohit Oyj, 00880 Helsinki, Finland
| | - Seija E Grénman
- Department of Obstetrics and Gynecology, Turku University Hospital, University of Turku, 20520 Turku, Finland
| | - Stina M Syrjänen
- Department of Oral Pathology and Radiology, University of Turku, 20520 Turku, Finland
- Department of Pathology, Turku University Hospital, 20520 Turku, Finland
| | - Karolina Louvanto
- Department of Oral Pathology and Radiology, University of Turku, 20520 Turku, Finland
- Department of Obstetrics and Gynecology, Faculty of Medicine and Health Technology, Tampere University, 33100 Tampere, Finland
- Department of Obstetrics and Gynecology, Tampere University Hospital, 33520 Tampere, Finland
| |
Collapse
|
2
|
de Moraes AG, Ayo CM, Elpídio LNS, de Souza VH, Yamanaka AHU, Nogueira ML, Passos SD, Brandão CC, de Mattos LC, do Amaral GC, Neto QADL, Visentainer JEL. HLA-G, LILRB1 and LILRB2 Variants in Zika Virus Transmission from Mother to Child in a Population from South and Southeast of Brazil. Curr Issues Mol Biol 2022; 44:2783-2793. [PMID: 35877415 PMCID: PMC9317030 DOI: 10.3390/cimb44070191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 05/04/2022] [Accepted: 05/04/2022] [Indexed: 12/04/2022] Open
Abstract
During the 2015–2016 epidemic, Brazil was the country with the highest rate of Zika virus (ZIKV) infection in the Americas. Twenty-nine percent of pregnant women positive for ZIKV exhibited ultrasound scans with fetus anomalies. Human leukocyte antigen-G (HLA-G) exerts immunoregulatory effects by binding to inhibitory receptors, namely LILRB1 and LILRB2, thus preventing mother–fetus rejection and vertical pathogen transmission. The binding of HLA-G to one of its receptors modulates both innate and adaptive immunity. However, in a viral infection, these molecules may behave as pathogenic mediators shifting the pregnancy environment from an anti-inflammatory profile to a pro-inflammatory phenotype. Genetic mutations might be associated with the change in phenotype. This study aimed to explore the possible role of polymorphic sites in HLA-G, LILRB1 and LILRB2 in mother–fetus ZIKV transmission. Polymorphisms were detected by direct sequencing. Differences in allele and/or genotype frequencies for each SNP analyzed among ZIKV non-transmitting and transmitting mother–child pairs, among ZIKV-transmitting and non-transmitting mothers and between ZIKV-infected and non-infected children were compared by Mid-P exact test or Yates’ correction. Significant susceptibility of ZIKV vertical transmission is suggested in ZIKV-transmitting and non-transmitting mothers and ZIKV-infected and non-infected children for LILRB1_rs1061684 T/T (p = 0.03, Pc = 0.06, OR = 12.4; p = 0.008, Pc = 0.016, OR = 16.4) and LILRB1_rs16985478 A/A (p = 0.01, Pc = 0.02, OR = 19.2; p = 0.008, Pc = 0.016, OR = 16.4). HLA-G_rs1710 (p = 0.04, Pc = 0.52, OR = 4.30) was also a susceptibility factor. LILRB2_rs386056 G/A (p = 0.02, Pc = 0.08, OR = 0.07), LILRB2_rs7247451 G/G (p = 0.01, Pc = 0.04, OR = 0.04) and HLAG_rs9380142 T/T (p = 0.04, Pc = 0.52, OR = 0.14) were suggested as protective factors against vertical transmission. The current study suggests that polymorphic sites in the LILRB1 and HLA-G genes might be associated with mother-to-child ZIKV transmission while LILRB2 might be associated with protection against ZIKV transmission in the womb in a population from the south and southeast of Brazil.
Collapse
Affiliation(s)
- Amarilis Giaretta de Moraes
- Post Graduation Program in Biosciences and Physiopathology, Department of Clinical Analysis and Biomedicine, State University of Maringá, Maringá 87020-270, PR, Brazil; (L.N.S.E.); (V.H.d.S.); (A.H.U.Y.); (Q.A.d.L.N.)
- Laboratory of Immunogenetics, Department of Basic Health Sciences, State University of Maringá, Maringá 87020-270, PR, Brazil
- Correspondence: (A.G.d.M.); (J.E.L.V.)
| | - Christiane Maria Ayo
- Laboratory of Immunogenetics, Department of Molecular Biology, Faculty of Medicine of São José do Rio Preto (FAMERP), São José do Rio Preto 15090-000, SP, Brazil; (C.M.A.); (C.C.B.); (L.C.d.M.)
| | - Laise Nayana Sala Elpídio
- Post Graduation Program in Biosciences and Physiopathology, Department of Clinical Analysis and Biomedicine, State University of Maringá, Maringá 87020-270, PR, Brazil; (L.N.S.E.); (V.H.d.S.); (A.H.U.Y.); (Q.A.d.L.N.)
- Laboratory of Immunogenetics, Department of Basic Health Sciences, State University of Maringá, Maringá 87020-270, PR, Brazil
| | - Victor Hugo de Souza
- Post Graduation Program in Biosciences and Physiopathology, Department of Clinical Analysis and Biomedicine, State University of Maringá, Maringá 87020-270, PR, Brazil; (L.N.S.E.); (V.H.d.S.); (A.H.U.Y.); (Q.A.d.L.N.)
- Laboratory of Immunogenetics, Department of Basic Health Sciences, State University of Maringá, Maringá 87020-270, PR, Brazil
| | - Aléia Harumi Uchibaba Yamanaka
- Post Graduation Program in Biosciences and Physiopathology, Department of Clinical Analysis and Biomedicine, State University of Maringá, Maringá 87020-270, PR, Brazil; (L.N.S.E.); (V.H.d.S.); (A.H.U.Y.); (Q.A.d.L.N.)
- Laboratory of Immunogenetics, Department of Basic Health Sciences, State University of Maringá, Maringá 87020-270, PR, Brazil
| | - Maurício Lacerda Nogueira
- Virology Research Laboratory, Department of Infectious and Parasitic Diseases, Medical School of São José do Rio Preto (FAMERP), São José do Rio Preto 15090-000, SP, Brazil;
| | - Saulo Duarte Passos
- Department of Pediatrics, Faculty of Medicine of Jundiai (FMJ), Jundiaí 13202-550, SP, Brazil;
| | - Cinara Cássia Brandão
- Laboratory of Immunogenetics, Department of Molecular Biology, Faculty of Medicine of São José do Rio Preto (FAMERP), São José do Rio Preto 15090-000, SP, Brazil; (C.M.A.); (C.C.B.); (L.C.d.M.)
| | - Luiz Carlos de Mattos
- Laboratory of Immunogenetics, Department of Molecular Biology, Faculty of Medicine of São José do Rio Preto (FAMERP), São José do Rio Preto 15090-000, SP, Brazil; (C.M.A.); (C.C.B.); (L.C.d.M.)
| | | | - Quirino Alves de Lima Neto
- Post Graduation Program in Biosciences and Physiopathology, Department of Clinical Analysis and Biomedicine, State University of Maringá, Maringá 87020-270, PR, Brazil; (L.N.S.E.); (V.H.d.S.); (A.H.U.Y.); (Q.A.d.L.N.)
- Laboratory of Immunogenetics, Department of Basic Health Sciences, State University of Maringá, Maringá 87020-270, PR, Brazil
| | - Jeane Eliete Laguila Visentainer
- Post Graduation Program in Biosciences and Physiopathology, Department of Clinical Analysis and Biomedicine, State University of Maringá, Maringá 87020-270, PR, Brazil; (L.N.S.E.); (V.H.d.S.); (A.H.U.Y.); (Q.A.d.L.N.)
- Laboratory of Immunogenetics, Department of Basic Health Sciences, State University of Maringá, Maringá 87020-270, PR, Brazil
- Correspondence: (A.G.d.M.); (J.E.L.V.)
| |
Collapse
|
3
|
Zhou S, Liu M, Xia Y, Zhang L, Shao L, Wang N, Yu W, Ding N, Zhang K, Liang X. Association of the 3' untranslated region polymorphisms of HLA-G with susceptibility to chronic hepatitis C virus infection in the Chinese population. Hum Immunol 2021; 83:47-52. [PMID: 34556350 DOI: 10.1016/j.humimm.2021.09.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 08/05/2021] [Accepted: 09/01/2021] [Indexed: 02/08/2023]
Abstract
Hepatitis C virus (HCV) infection is a global health problem. Several previous studies have addressed the role of host single-nucleotide polymorphisms (SNPs) in HCV infection. SNPs in the regulatory region of the human leukocyte antigen G (HLA-G) gene play an important role in several diseases. The objective of this study is to determine the association of HLA-G 3'untranslated region (UTR) polymorphisms with the susceptibility to chronic hepatitis C infection in the Chinese population. HLA-G 3' UTR polymorphisms, which include 14-bp Ins/Del (rs371194629), +3003T/C (rs1707), +3010C/G (rs1710), +3027 A/C (rs17179101), +3035C/T (rs17179108), +3142 G/C (rs1063320), +3187 A/G (rs9380142) and + 3196C/G (rs1610696), were analyzed in 246 patients with chronic hepatitis C infection and 294 healthy individuals. The alleles, genotypes, and haplotypes were compared between chronic hepatitis C-infected subjects and controls using chi-square tests and logistic regression models. After a correction of multiple comparisons by the false discovery rate (FDR), the allele frequency of + 3196C, genotype frequencies of + 3187 AA and + 3196CC and frequency of the UTR-3 haplotype were significantly higher in the patients than in the control group (P < 0.05), whereas the frequencies of UTR-1 and UTR-2 haplotypes were significantly lower in the patients than in the control group (P < 0.05). After a correction of multiple comparisons by FDR, UTR-2 and UTR-3 maintained significant associations with chronic hepatitis C. This study indicates that HLA-G 3'UTR polymorphisms are associated with the susceptibility to chronic hepatitis C infection in the Chinese population. HLA-G 3'UTR may play an important role in risk modulation toward HCV infection.
Collapse
Affiliation(s)
- Shihang Zhou
- Department of Blood Group, Dalian Blood Center, Dalian, China
| | - Ming Liu
- Department of Cell Biology, Dalian Medical University, Dalian, China
| | - Yuexin Xia
- Department of Blood Group, Dalian Blood Center, Dalian, China
| | - Li Zhang
- Department of Blood Group, Dalian Blood Center, Dalian, China
| | - Linnan Shao
- Department of Blood Group, Dalian Blood Center, Dalian, China
| | - Ni Wang
- Department of Blood Group, Dalian Blood Center, Dalian, China
| | - Weijian Yu
- Department of Blood Group, Dalian Blood Center, Dalian, China
| | - Nan Ding
- Dalian Sixth People's Hospital Affiliated of Dalian Medical University, Dalian, China
| | - Kaili Zhang
- Department of Cell Biology, Dalian Medical University, Dalian, China
| | - Xiaohua Liang
- Department of Blood Group, Dalian Blood Center, Dalian, China.
| |
Collapse
|
4
|
The HLA-G 14-bp insertion/deletion polymorphism is associated with chronic hepatitis B in Southern Brazil: A case-control study. Hum Immunol 2020; 81:79-84. [PMID: 31955869 DOI: 10.1016/j.humimm.2020.01.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Revised: 12/08/2019] [Accepted: 01/07/2020] [Indexed: 12/14/2022]
Abstract
There is growing evidence that the non-classical HLA-G has a role in the process of the immune response against pathogens, including HBV and HIV. Previous studies demonstrated that a 14-bp insertion/deletion (indel) polymorphism at 3'-untranslated region of HLA-G gene interferes in the mRNA stability and expression. The present study aimed to evaluate the association of the 14-bp indel polymorphism (rs371194629) with HBV infection in chronic hepatitis B (CHB) mono-infected and HBV/HIV co-infected patients from Southern Brazil. A total of 817 individuals were analyzed, including 357 CHB patients, 134 HBV/HIV co-infected patients and 326 healthy controls. The 14-bp indel polymorphism was analyzed by DNA amplification using PCR. Logistic regression models were performed to compute adjusted odds ratios (aORs) and 95% confidence intervals (95% CIs). To control for multiple comparisons, the Bonferroni correction was applied to the p-values. The 14-bp Ins allele was observed in 47.6% of the CHB mono-infected patients and in 41.6% of the controls (aOR = 1.33; 95% CI: 1.05-1.60; p = 0.02; pcorrected = 0.08). The results also showed that the 14-bp Ins/Ins genotype was present in 21.8% of the CHB mono-infected patients and in 12.9% of the controls (aOR = 1.91; 95% CI: 1.21-3.01; p < 0.01; pcorrected = 0.02). There was significant association between the 14-bp indel and CHB monoinfection, but not in HBV/HIV co-infection. In conclusion, the 14-bp indel polymorphism was associated with CHB in this specific population.
Collapse
|
5
|
Wyatt RC, Lanzoni G, Russell MA, Gerling I, Richardson SJ. What the HLA-I!-Classical and Non-classical HLA Class I and Their Potential Roles in Type 1 Diabetes. Curr Diab Rep 2019; 19:159. [PMID: 31820163 PMCID: PMC6901423 DOI: 10.1007/s11892-019-1245-z] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
PURPOSE OF REVIEW Hyperexpression of classical HLA class I (HLA-I) molecules in insulin-containing islets has become a widely accepted hallmark of type 1 diabetes pathology. In comparison, relatively little is known about the expression, function and role of non-classical subtypes of HLA-I. This review focuses on the current understanding of the non-classical HLA-I subtypes: HLA-E, HLA-F and HLA-G, within and outside the field of type 1 diabetes, and considers the possible impacts of these molecules on disease etiology. RECENT FINDINGS Evidence is growing to suggest that non-classical HLA-I proteins are upregulated, both at the RNA and protein levels in the pancreas of individuals with recent-onset type 1 diabetes. Moreover, associations between non-classical HLA-I genotypes and age at onset of type 1 diabetes have been reported in some studies. As with classical HLA-I, it is likely that hyperexpression of non-classical HLA-I is driven by the release of diffusible interferons by stressed β cells (potentially driven by viral infection) and exacerbated by release of cytokines from infiltrating immune cells. Non-classical HLA-I proteins predominantly (but not exclusively) transduce negative signals to immune cells infiltrating at the site of injury/inflammation. We propose a model in which the islet endocrine cells, through expression of non-classical HLA-I are fighting back against the infiltrating immune cells. By inhibiting the activity and function on NK, B and select T cells, the non-classical HLA-I, proteins will reduce the non-specific bystander effects of inflammation, while at the same time still allowing the targeted destruction of β cells by specific islet-reactive CD8+ T cells.
Collapse
Affiliation(s)
- Rebecca C. Wyatt
- Institute of Biomedical and Clinical Science, University of Exeter Medical School, RILD Building, Barrack Road, Exeter, EX2 5DW UK
| | - Giacomo Lanzoni
- Diabetes Research Institute, University of Miami – Miller School of Medicine, 1450 NW 10th Avenue, Miami, FL 33136 USA
- Department of Biochemistry and Molecular Biology, University of Miami – Miller School of Medicine, 1011 NW 15th Street, Miami, FL 33136 USA
| | - Mark A. Russell
- Institute of Biomedical and Clinical Science, University of Exeter Medical School, RILD Building, Barrack Road, Exeter, EX2 5DW UK
| | - Ivan Gerling
- Department of Medicine University of Tennessee Health Science Center and VA Medical Center Research Service, 1030 Jefferson Avenue, Memphis, TN 38128 USA
| | - Sarah J. Richardson
- Institute of Biomedical and Clinical Science, University of Exeter Medical School, RILD Building, Barrack Road, Exeter, EX2 5DW UK
| |
Collapse
|
6
|
de Almeida BS, Muniz YCN, Prompt AH, Castelli EC, Mendes-Junior CT, Donadi EA. Genetic association between HLA-G 14-bp polymorphism and diseases: A systematic review and meta-analysis. Hum Immunol 2018; 79:724-735. [PMID: 30102938 DOI: 10.1016/j.humimm.2018.08.003] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Revised: 08/09/2018] [Accepted: 08/09/2018] [Indexed: 12/11/2022]
Abstract
BACKGROUND HLA-G is an immune checkpoint molecule. Since a differential molecule expression has been reported even for healthy individuals, many studies have focused on polymorphisms at HLA-G regulatory regions, particularly the 3' untranslated region (3'UTR). The presence/absence of a 14-bp sequence was the first polymorphism described and it is the most studied in association between HLA-G and disorders. METHODS In this study, we performed a systematic review and meta-analysis of all association studies published regarding the HLA-G 14-bp. RESULTS We verified association between 14-bp alleles and diseases in the following situations: (1) presence of 14-bp (insertion) conferred susceptibility to preeclampsia (child alleles evaluated) and systemic lupus erythematosus (OR = 1.42; 95%CI = 1.04-1.93; p = 0.026 and OR = 1.13; 95%CI = 1.01-1.27, p = 0.028); (2) 14-bp absence (deletion) was associated with increased risk to breast cancer (OR = 1.23; 95%CI = 1.06-1.43; p = 0.006) and human Cytomegalovirus infection (OR = 2.06; 95%CI = 1.60-2.64; p < 0.0001); and (3) a risk association was observed between the group of reproductive disorders and the 14-bp insertion (OR = 1.12; 95%CI = 1.01-1.24; p = 0.034). CONCLUSIONS Considering that others 14-bp associations were inconclusive and that other variation sites observed at HLA-G 3'UTR exhibit a proven role on post-transcriptional regulation of HLA-G expression, the complete 3'UTR segment should be analyzed in terms of disease susceptibility, instead of a single polymorphism.
Collapse
Affiliation(s)
- Bibiana Sgorla de Almeida
- Divisão de Imunologia Clínica, Departamento de Clínica Médica, Faculdade de Medicina de Ribeirão Preto (FMRP), Universidade de São Paulo (USP), 14049-900 Ribeirão Preto, SP, Brazil; Laboratório Multiusuário de Estudos em Biologia, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina (UFSC), Florianópolis, Brazil.
| | - Yara Costa Netto Muniz
- Departamento de Biologia Celular, Embriologia e Genética, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina (UFSC), Florianópolis, Brazil.
| | - Alice Heidrich Prompt
- Departamento de Biologia Celular, Embriologia e Genética, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina (UFSC), Florianópolis, Brazil.
| | - Erick C Castelli
- Departamento de Patologia, Faculdade de Medicina de Botucatu, Unesp - Univ. Estadual Paulista, 18618-970 Botucatu, SP, Brazil.
| | - Celso Teixeira Mendes-Junior
- Faculdade de Filosofia Ciências e Letras de Ribeirão Preto (FFCLRP), Universidade de São Paulo (USP), 14049-900 Ribeirão Preto, SP, Brazil.
| | - Eduardo Antonio Donadi
- Divisão de Imunologia Clínica, Departamento de Clínica Médica, Faculdade de Medicina de Ribeirão Preto (FMRP), Universidade de São Paulo (USP), 14049-900 Ribeirão Preto, SP, Brazil.
| |
Collapse
|
7
|
Tripathy K, Chawla R, Temkar S, Sagar P, Kashyap S, Pushker N, Sharma YR. Phthisis Bulbi-a Clinicopathological Perspective. Semin Ophthalmol 2018; 33:788-803. [PMID: 29902388 DOI: 10.1080/08820538.2018.1477966] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Phthisis bulbi denotes end-stage eye disease characterized by shrinkage and disorganization of the eye with the resultant functional loss. The major factors associated with the pathogenesis of phthisis are hypotony, deranged blood-ocular barriers, and inflammation. Common causes include trauma, surgery, infection, inflammation, malignancy, retinal detachment, and vascular lesions. A phthisical globe shows a small squared off shape, opaque and thickened cornea, thickened sclera, neovascularization of iris, cataract, cyclitic membrane, ciliochoroidal detachment, and retinal detachment. Microscopic features include internal disorganization, inflammatory reaction, a reactive proliferation of various cells, calcification, and ossification. Early treatment of the causative etiology is the best strategy available to avoid an eye from going into phthisis. A phthisical eye has no visual potential and cosmetic rehabilitation or symptomatic relief of pain remains the mainstay in the management. The authors present a comprehensive review of the etiopathogenesis, pathology, clinical features, and management of the end-stage ocular disease.
Collapse
Affiliation(s)
- Koushik Tripathy
- a Department of Ophthalmology, Dr. Rajendra Prasad Centre for ophthalmic sciences , All India Institute of Medical Sciences , New Delhi , India
| | - Rohan Chawla
- a Department of Ophthalmology, Dr. Rajendra Prasad Centre for ophthalmic sciences , All India Institute of Medical Sciences , New Delhi , India
| | - Shreyas Temkar
- a Department of Ophthalmology, Dr. Rajendra Prasad Centre for ophthalmic sciences , All India Institute of Medical Sciences , New Delhi , India
| | - Pradeep Sagar
- a Department of Ophthalmology, Dr. Rajendra Prasad Centre for ophthalmic sciences , All India Institute of Medical Sciences , New Delhi , India
| | - Seema Kashyap
- b Department of Ophthalmic Pathology, Dr. Rajendra Prasad Centre for ophthalmic sciences , All India Institute of Medical Sciences , New Delhi , India
| | - Neelam Pushker
- a Department of Ophthalmology, Dr. Rajendra Prasad Centre for ophthalmic sciences , All India Institute of Medical Sciences , New Delhi , India
| | - Yog Raj Sharma
- a Department of Ophthalmology, Dr. Rajendra Prasad Centre for ophthalmic sciences , All India Institute of Medical Sciences , New Delhi , India
| |
Collapse
|
8
|
Crux NB, Elahi S. Human Leukocyte Antigen (HLA) and Immune Regulation: How Do Classical and Non-Classical HLA Alleles Modulate Immune Response to Human Immunodeficiency Virus and Hepatitis C Virus Infections? Front Immunol 2017; 8:832. [PMID: 28769934 PMCID: PMC5513977 DOI: 10.3389/fimmu.2017.00832] [Citation(s) in RCA: 116] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Accepted: 06/30/2017] [Indexed: 12/13/2022] Open
Abstract
The genetic factors associated with susceptibility or resistance to viral infections are likely to involve a sophisticated array of immune response. These genetic elements may modulate other biological factors that account for significant influence on the gene expression and/or protein function in the host. Among them, the role of the major histocompatibility complex in viral pathogenesis in particular human immunodeficiency virus (HIV) and hepatitis C virus (HCV), is very well documented. We, recently, added a novel insight into the field by identifying the molecular mechanism associated with the protective role of human leukocyte antigen (HLA)-B27/B57 CD8+ T cells in the context of HIV-1 infection and why these alleles act as a double-edged sword protecting against viral infections but predisposing the host to autoimmune diseases. The focus of this review will be reexamining the role of classical and non-classical HLA alleles, including class Ia (HLA-A, -B, -C), class Ib (HLA-E, -F, -G, -H), and class II (HLA-DR, -DQ, -DM, and -DP) in immune regulation and viral pathogenesis (e.g., HIV and HCV). To our knowledge, this is the very first review of its kind to comprehensively analyze the role of these molecules in immune regulation associated with chronic viral infections.
Collapse
Affiliation(s)
- Nicole B Crux
- Faculty of Medicine and Dentistry, Department of Dentistry, University of Alberta, Edmonton, AB, Canada.,Faculty of Medicine and Dentistry, Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, AB, Canada
| | - Shokrollah Elahi
- Faculty of Medicine and Dentistry, Department of Dentistry, University of Alberta, Edmonton, AB, Canada.,Faculty of Medicine and Dentistry, Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, AB, Canada
| |
Collapse
|
9
|
Martinez J, Santiago MR, Martelli-Palomino G, Souza DAD, Silva TGA, Silva GEB, Chahud F, Donadi EA, Fernandes APM. Expression of HLA-E molecules in the placental tissue of women infected with HIV-1 and uninfected women. Placenta 2017; 49:33-36. [PMID: 28012452 DOI: 10.1016/j.placenta.2016.08.082] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Revised: 07/25/2016] [Accepted: 08/22/2016] [Indexed: 11/18/2022]
Abstract
INTRODUCTION Expression of HLA-E molecule in the placental extravillous trophoblast is associated with immune system cell inhibition, resulting in immune tolerance to fetus during pregnancy. HIV-1 can infect trophoblast cells and modify the expression of HLA-E, which may inhibit the cytotoxic activity of the immune system. AIM The aim of this study was to evaluate HLA-E expression in third trimester placental tissue of women infected with HIV-1 and uninfected women. METHODS We performed an immunohistochemistry assay to evaluate HLA-E staining in the placental tissue of 99 HIV-1 infected and 85 uninfected women. A pathologist analyzed and classified the HLA-E expression in the placental cells. RESULTS Irrespective of the HIV status, HLA-E staining was observed in the extravillous trophoblast cells, endothelial cells and Hofbauer cells, but not in the syncytiotrophoblast. HLA-E staining showed no significant difference between the placental tissue of women infected with HIV-1 and uninfected women (P = 0.76). Considering HIV-1 infected women, HLA-E staining was not influenced by HIV-1 viral load (P = 0.48), CD4+ T-cell count (P = 0.10) and antiretroviral therapy used during pregnancy (P = 0.54). DISCUSSION Despite the presence of HIV-1 infection, the expression of HLA-E molecules in the placental tissue was not modified when the infection was under antiretroviral therapy control.
Collapse
Affiliation(s)
- Juliana Martinez
- University of São Paulo at Ribeirão Preto College of Nursing, General and Specialized Nursing Department, Avenida dos Bandeirantes, 3900, Monte Alegre, Ribeirão Preto, CEP 14040-902, SP, Brazil
| | - Mariana Rodrigues Santiago
- University of São Paulo at Ribeirão Preto College of Nursing, General and Specialized Nursing Department, Avenida dos Bandeirantes, 3900, Monte Alegre, Ribeirão Preto, CEP 14040-902, SP, Brazil
| | - Gustavo Martelli-Palomino
- Departamento de Análises Clínicas e Toxicológicas, Universidade Federal do Rio Grande do Norte (UFRN), Natal, Brazil
| | - Diego Agra de Souza
- University of São Paulo at Ribeirão Preto School of Medicine, Pathology Department, Avenida dos Bandeirantes, 3900, Monte Alegre, Ribeirão Preto, SP, Brazil
| | - Társia Giabardo Alves Silva
- School of Pharmaceutical Sciences, Universidade Estadual Paulista Júlio de Mesquita Filho, Rodovia Araraquara, Jaú Km 1, Campos Ville, Araraquara, SP, Brazil
| | - Gyl Eanes Barros Silva
- University of São Paulo at Ribeirão Preto School of Medicine, Pathology Department, Avenida dos Bandeirantes, 3900, Monte Alegre, Ribeirão Preto, SP, Brazil
| | - Fernando Chahud
- University of São Paulo at Ribeirão Preto School of Medicine, Pathology Department, Avenida dos Bandeirantes, 3900, Monte Alegre, Ribeirão Preto, SP, Brazil
| | - Eduardo Antônio Donadi
- University of São Paulo at Ribeirão Preto School of Medicine, Medical Clinical Department, Avenida dos Bandeirantes, 3900, Monte Alegre, Ribeirão Preto, SP, Brazil
| | - Ana Paula Morais Fernandes
- University of São Paulo at Ribeirão Preto College of Nursing, General and Specialized Nursing Department, Avenida dos Bandeirantes, 3900, Monte Alegre, Ribeirão Preto, CEP 14040-902, SP, Brazil.
| |
Collapse
|
10
|
Hong HA, Paximadis M, Gray GE, Kuhn L, Tiemessen CT. Maternal human leukocyte antigen-G (HLA-G) genetic variants associate with in utero mother-to-child transmission of HIV-1 in Black South Africans. INFECTION GENETICS AND EVOLUTION 2014; 30:147-158. [PMID: 25541520 DOI: 10.1016/j.meegid.2014.12.021] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2014] [Revised: 11/24/2014] [Accepted: 12/15/2014] [Indexed: 01/09/2023]
Abstract
A 14-bp insertion/deletion (indel) within the 3' untranslated region (3'UTR) that affects HLA-G expression has been associated with HIV-1 mother-to-child transmission (MTCT). However, other 3'UTR single nucleotide polymorphisms (SNPs) that influence HLA-G mRNA stability have been described but not analysed in the context of MTCT, and little is known about the role of HLA-G alleles. We examined HLA-G alleles and 3'UTR SNPs, including the 14-bp indel, in 216 mother-infant pairs from Johannesburg, South Africa. Mother-infant pairs were classified as HIV-1 non-transmitting (NT, n=144) or HIV-1 transmitting (TR, n=72) with either intrapartum (IP, n=29) or in utero (IU, n=19) infected infants. We found HLA-G allele, G(∗)01:01:02 (in strong linkage disequilibrium with the 14-bp insertion) and +3187G SNP were significantly over-represented in IU-TR mothers compared to NT mothers (P=0.036, OR=2.26; P=0.011, OR=2.96, respectively). These findings suggest that maternal HLA-G alleles and/or SNPs that might alter expression of HLA-G potentially influence IU HIV-1 MTCT.
Collapse
Affiliation(s)
- Heather A Hong
- Centre for HIV & STIs, National Institute for Communicable Diseases, National Health Laboratory Service, and Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Maria Paximadis
- Centre for HIV & STIs, National Institute for Communicable Diseases, National Health Laboratory Service, and Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Glenda E Gray
- Perinatal HIV Research Unit, Chris Hani Baragwanath Hospital, Soweto, South Africa, and Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Louise Kuhn
- Gertrude H. Sergievsky Centre, College of Physicians and Surgeons and Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, USA
| | - Caroline T Tiemessen
- Centre for HIV & STIs, National Institute for Communicable Diseases, National Health Laboratory Service, and Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa.
| |
Collapse
|
11
|
da Silva GK, Vianna P, Veit TD, Crovella S, Catamo E, Cordero EAA, Mattevi VS, Lazzaretti RK, Sprinz E, Kuhmmer R, Chies JAB. Influence of HLA-G polymorphisms in human immunodeficiency virus infection and hepatitis C virus co-infection in Brazilian and Italian individuals. INFECTION GENETICS AND EVOLUTION 2014; 21:418-23. [PMID: 24389119 DOI: 10.1016/j.meegid.2013.12.013] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Revised: 12/09/2013] [Accepted: 12/12/2013] [Indexed: 10/25/2022]
Abstract
OBJECTIVE This study aimed to investigate the role of Human Leukocyte Antigen (HLA)-G in the susceptibility to HIV-1 infection through the analysis of the HLA-G 3' untranslated region (UTR) polymorphisms 14 bp insertion/deletion (rs66554220) and +3142C>G (rs1063320). DESIGN We analyzed 582 HIV-1 infected patients and 626 uninfected individuals from Brazil and Italy in a case-control study. METHODS HLA-G polymorphisms were genotyped using PCR, PCR-RFLP assays or direct sequencing. All analyses were stratified by ethnicity. Genotypic, allelic and diplotypic frequencies were compared between HIV-1 infected subjects and controls using Chi-square or Fischer exact tests. Also, haplotypic frequencies were estimated using MLocus software. RESULTS African-derived HIV-infected individuals presented a higher frequency of the 14 bp insertion allele as compared to non-infected individuals (0.468 versus 0.373, respectively; p(Bonf) = 0.010). A higher frequency of the 14 bp insertion +3142G (insG) haplotype (0.456 versus 0.346, p<0.001) and the insG/insG diplotype (OR=1.88, 95%CI = 1.08-3.23, p=0.021) was observed among African-derived patients as compared to uninfected controls. Also, we observed a higher frequency of the ins/ins genotype among African-derived HIV patients co-infected with HCV (OR=2.78, 95%CI = 1.20-6.49, p = 0.008). CONCLUSIONS Our data point out to an increased frequency of alleles and genotypes associated with low HLA-G expression among African-derived patients, suggesting a potential role for HLA-G in the susceptibility to HIV-1 infection and HCV co-infection in those individuals.
Collapse
Affiliation(s)
| | | | | | - Sergio Crovella
- Department of Genetics, Federal University of Pernambuco, Brazil
| | | | | | | | | | | | | | | |
Collapse
|
12
|
da Silva RC, Bedin E, Mangano A, Aulicino P, Pontillo A, Brandão L, Guimarães R, Arraes LC, Sen L, Crovella S. HIV mother-to-child transmission: a complex genetic puzzle tackled by Brazil and Argentina research teams. INFECTION GENETICS AND EVOLUTION 2013; 19:312-22. [PMID: 23524206 DOI: 10.1016/j.meegid.2013.03.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2012] [Revised: 03/05/2013] [Accepted: 03/07/2013] [Indexed: 11/24/2022]
Abstract
Human immunodeficiency virus (HIV) mother-to-child transmission is a complex event, depending upon environmental factors and is affected by host genetic factors from mother and child, as well as viral genetic elements. The integration of multiple parameters (CD4 cell count, virus load, HIV subtype, and host genetic markers) could account for the susceptibility to HIV infection, a multifactorial trait. The goal of this manuscript is to analyze the immunogenetic factors associated to HIV mother-to-child transmission, trying to unravel the genetic puzzle of HIV mother-to-child transmission and considering the experience in this topic of two research groups from Brazil and Argentina.
Collapse
Affiliation(s)
- R Celerino da Silva
- Department of Genetics, Federal University of Pernambuco, Av. Prof. Moraes Rego, s/n°, CEP 50.670-420, Cidade Universitária, Recife, Pernambuco, Brazil; Laboratory of Immunopathology Keizo Asami, Federal University of Pernambuco, Av. Prof. Moraes Rego, s/n°, CEP 50.670-420, Cidade Universitária, Recife, Pernambuco, Brazil
| | | | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Louvain de Souza T, de Souza Campos Fernandes RC, Medina-Acosta E. HIV-1 control in battlegrounds: important host genetic variations for HIV-1 mother-to-child transmission and progression to clinical pediatric AIDS. Future Virol 2012. [DOI: 10.2217/fvl.12.49] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
HIV-1 mother-to-child transmission (MTCT) is the passing of maternal HIV-1 to the offspring during pregnancy, labor and delivery, and/or breastfeeding. HIV-1 MTCT and the evolution to pediatric AIDS are multifactorial, dynamic and variable phenotypic conditions. Both genetic and nongenetic variables can influence susceptibility to HIV-1 MTCT or the rate of progression to clinical pediatric AIDS. In this review, we summarize the current state of knowledge about the roles of genetic variations seen in host immune response genes, and those that have been independently associated, mostly through population genetics of candidate genes, with interindividual susceptibility to HIV-1 MTCT, and progression to pediatric AIDS. We examine common and rare host genetic variations at coding and noncoding polymorphisms, whether functional or not, in agonists and antagonists of the immune response, which have been implicated in HIV-1 control in battlegrounds of cell entry, replication and evolution to AIDS. Further, we point to over 380 single-nucleotide polymorphisms, mostly within the HLA super region, recently identified in unbiased genome-wide association studies of HIV replication and evolution in adults, still unexplored in the context of HIV-1 MTCT, and which are likely to also influence susceptibility to pediatric HIV-1/AIDS.
Collapse
Affiliation(s)
- Thais Louvain de Souza
- Molecular Identification & Diagnosis Unit, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Brazil
| | - Regina Célia de Souza Campos Fernandes
- Municipal Program for the Surveillance of Sexually Transmitted Diseases & Acquired Immunodeficiency Syndrome of Campos dos Goytacazes, Brazil
- Faculty of Medicine of Campos, Campos dos Goytacazes, Brazil
| | | |
Collapse
|
14
|
Segat L, Crovella S. HLA-G 14bp del/ins genetic variation: association with susceptibility to human immunodeficiency virus-1 vertical transmission but not with human immunodeficiency virus-1 infection through horizontal transmission. ACTA ACUST UNITED AC 2012; 80:12-3. [DOI: 10.1111/j.1399-0039.2012.01874.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
|
15
|
Levenson VV, Melnikov AA. DNA methylation as clinically useful biomarkers-light at the end of the tunnel. Pharmaceuticals (Basel) 2012; 5:94-113. [PMID: 24288045 PMCID: PMC3763627 DOI: 10.3390/ph5010094] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2011] [Revised: 01/10/2012] [Accepted: 01/11/2012] [Indexed: 12/20/2022] Open
Abstract
A recent expansion of our knowledge about epigenetic changes strongly suggests that epigenetic rather than genetic features better reflect disease development, and consequently, can become more conclusive biomarkers for the detection and diagnosis of different diseases. In this paper we will concentrate on the current advances in DNA methylation studies that demonstrate a direct link between abnormal DNA methylation and a disease. This link can be used to develop diagnostic biomarkers that will precisely identify a particular disease. It also appears that disease-specific DNA methylation patterns undergo unique changes in response to treatment with a particular drug, thus raising the possibility of DNA methylation-based biomarkers for the monitoring of treatment efficacy, for prediction of response to treatment, and for the prognosis of outcome. While biomarkers for oncology are the most obvious applications, other fields of medicine are likely to benefit as well. This potential is demonstrated by DNA methylation-based biomarkers for neurological and psychiatric diseases. A special requirement for a biomarker is the possibility of longitudinal testing. In this regard cell-free circulating DNA from blood is especially interesting because it carries methylation markers specific for a particular disease. Although only a few DNA methylation-based biomarkers have attained clinical relevance, the ongoing efforts to decipher disease-specific methylation patterns are likely to produce additional biomarkers for detection, diagnosis, and monitoring of different diseases in the near future.
Collapse
Affiliation(s)
- Victor V Levenson
- Department of Radiation Oncology, Rush University Medical Center, 1750 West Harrison Street, Chicago, IL 60612, USA.
| | | |
Collapse
|
16
|
Haddad R, Cilião Alves DC, Rocha–Junior MC, Azevedo R, do Socorro Pombo–de–Oliveira M, Takayanagui OM, Donadi EA, Covas DT, Kashima S. HLA-G 14-bp insertion/deletion polymorphism is a risk factor for HTLV-1 infection. AIDS Res Hum Retroviruses 2011; 27:283-8. [PMID: 20977358 DOI: 10.1089/aid.2010.0165] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
About 95% of HTLV-1 infected patients remain asymptomatic throughout life, and the risk factors associated with the development of related diseases, such as HAM/TSP and ATL, are not fully understood. The human leukocyte antigen-G molecule (HLA-G), a nonclassical HLA class I molecule encoded by MHC, is expressed in several pathological conditions, including viral infection, and is related to immunosuppressive effects that allow the virus-infected cells to escape the antiviral defense of the host. The 14-bp insertion/deletion polymorphism of exon 8 HLA-G gene influences the stability of the transcripts and could be related to HTLV-1-infected cell protection and to the increase of proviral load. The present study analyzed by conventional PCR the 14-bp insertion/deletion polymorphism of exon 8 HLA-G gene in 150 unrelated healthy subjects, 82 HTLV-1 infected patients with symptoms (33 ATL and 49 HAM), and 56 asymptomatic HTLV-1 infected patients (HAC). In addition, the proviral load was determined by quantitative real-time PCR in all infected groups and correlated with 14-bp insertion/deletion genotypes. The heterozygote genotype frequencies were significantly higher in HAM, in the symptomatic group, and in infected patients compared to control (p < 0.05). The proviral load was higher in the symptomatic group than the HAC group (p < 0.0005). The comparison of proviral load and genotypes showed that -14-bp/-14-bp genotype had a higher proviral load than +14-bp/-14-bp and +14-bp/+14-bp genotypes. Although HLA-G 14-bp polymorphism does not appear to be associated with HTLV-1 related disease development, it could be a genetic risk factor for susceptibility to infection.
Collapse
Affiliation(s)
- Rodrigo Haddad
- Hemocentro de Ribeirão Preto, Universidade de São Paulo (USP) Ribeirão Preto, São Paulo, Brazil
- Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo (USP) Ribeirão Preto, São Paulo, Brazil
| | | | - Maurício Cristiano Rocha–Junior
- Hemocentro de Ribeirão Preto, Universidade de São Paulo (USP) Ribeirão Preto, São Paulo, Brazil
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo (USP) Ribeirão Preto, São Paulo, Brazil
| | - Rochele Azevedo
- Hemocentro de Ribeirão Preto, Universidade de São Paulo (USP) Ribeirão Preto, São Paulo, Brazil
| | | | | | - Eduardo Antônio Donadi
- Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo (USP) Ribeirão Preto, São Paulo, Brazil
| | - Dimas Tadeu Covas
- Hemocentro de Ribeirão Preto, Universidade de São Paulo (USP) Ribeirão Preto, São Paulo, Brazil
- Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo (USP) Ribeirão Preto, São Paulo, Brazil
| | - Simone Kashima
- Hemocentro de Ribeirão Preto, Universidade de São Paulo (USP) Ribeirão Preto, São Paulo, Brazil
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo (USP) Ribeirão Preto, São Paulo, Brazil
| |
Collapse
|
17
|
Donadi EA, Castelli EC, Arnaiz-Villena A, Roger M, Rey D, Moreau P. Implications of the polymorphism of HLA-G on its function, regulation, evolution and disease association. Cell Mol Life Sci 2010; 68:369-95. [PMID: 21107637 PMCID: PMC3021195 DOI: 10.1007/s00018-010-0580-7] [Citation(s) in RCA: 245] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2010] [Accepted: 10/22/2010] [Indexed: 12/27/2022]
Abstract
The HLA-G gene displays several peculiarities that are distinct from those of classical HLA class I genes. The unique structure of the HLA-G molecule permits a restricted peptide presentation and allows the modulation of the cells of the immune system. Although polymorphic sites may potentially influence all biological functions of HLA-G, those present at the promoter and 3′ untranslated regions have been particularly studied in experimental and pathological conditions. The relatively low polymorphism observed in the MHC-G coding region both in humans and apes may represent a strong selective pressure for invariance, whereas, in regulatory regions several lines of evidence support the role of balancing selection. Since HLA-G has immunomodulatory properties, the understanding of gene regulation and the role of polymorphic sites on gene function may permit an individualized approach for the future use of HLA-G for therapeutic purposes.
Collapse
Affiliation(s)
- Eduardo A Donadi
- Division of Clinical Immunology, Department of Medicine, School of Medicine of Ribeirão Preto, University of São Paulo, Av. Bandeirantes, 3900, 14049-900 Ribeirão Preto, SP, Brazil.
| | | | | | | | | | | |
Collapse
|