1
|
Raju K, Karuppiah B, Chinniah R. The HLA profile and genetic affinities of three primitive Tamil-speaking endogamous groups: Kallars of Thanjavur, Piramalai Kallar and Vanniyar. EGYPTIAN JOURNAL OF MEDICAL HUMAN GENETICS 2022. [DOI: 10.1186/s43042-022-00378-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Abstract
Background
The present study was aimed to study the frequencies of HLA-DRB1/-DQB1 alleles and haplotypes of three endogamous groups of Tamil Nadu state, South India. PCR-SSP typing of HLA-DRB1 and -DQB1 alleles were performed on 111 Kallars of Thanjavur, 80 Piramalai Kallar of Madurai and 119 Vanniyar. Genetic distances, neighbor-joining phylogenetic dendrograms and correspondence analysis have been performed.
Results
The HLA class II alleles, DRB1*07 (25.2%), DRB1*15 (15.7%), DRB1*14 (11.7%) and DRB1*12 (9.90%) among Kallars of Thanjavur; DRB1*15 (28.7%), DRB1*04 (15.6%), DRB1*10 (14.3%), DRB1*13 (11.2%) and DRB1*03 (9.37%) among Piamalai Kallar and DRB1*15 (24.7%), DRB1*04 (15.9%), DRB1*07 (11.7%), DRB1*12 (11.3%) and DRB1*10 (10.0%) among Vanniyar were more frequent. Similarly, alleles DQB1*06 (31.0%), DQB1*02 (26.5%) and DQB1*05 (24.7%) among Kallars of Thanjavur; DQB1*05 (32.5%), DQB1*06 (31.8%), DQB1*02 (16.2%) and DQB1*03:02 (12.5%) among Piramalai Kallar and DQB1*05 (52.9%), DQB1*06 (22.6%) and DQB1*02 (11.3%) among Vanniyar were more frequent. We genotyped the two most frequent two-locus haplotypes, such as DRB1*15-DQB1*06 and DRB1*07-DQB1*02 for HLA-A/-B/–C alleles to identify the 5-locus extended haplotypes to extrapolate global affinities. We identified a number of five locus extended haplotypes among south Indian population with stronger global affinities. Further, we identified the presence of a highly unique extended haplotypes such as A*11-B*35-C*12-DRB1*07-DQB1*02 (HF:0.1458) in Kallars of Thanjavur, A*03-B*35-C*04-DRB1*15-DQB1*06 (HF:0.1833) in Piramalai Kallar and A*03-B*07-C*07-DRB1*15-DQB1*06 (HF: 0.1800) in Kallars of Thanjavur and (HF: 0.1081) in Vanniyar population.
Conclusions
Allele distribution and haplotype analysis have demonstrated that the Kallars of Thanjavur, Piramalai Kallar and Vanniyar populations shared HLA alleles with other ethnic and other Indian populations, while showing population specific haplotypes. Analysis of population-specific distribution of HLA alleles is proved to be important in finding out the relatedness of the ethnic groups across continents. The extensive polymorphism of the HLA system also has useful application in the study of the origin, evolution and migration patterns of human populations.
Collapse
|
2
|
Verma AK, Mechenro J, Monachesi C, Venugopal G, Catassi GN, Lionetti E, Ramakrishna BS, Catassi C. Distribution of celiac disease predisposing genes HLA-DQ2 and HLA-DQ8 in the native population of southern India. Indian J Gastroenterol 2022; 41:240-246. [PMID: 35767211 DOI: 10.1007/s12664-022-01251-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Accepted: 01/31/2022] [Indexed: 02/04/2023]
Abstract
BACKGROUND Celiac disease (CD) is an intestinal inflammatory condition caused by the ingestion of gluten peptides in wheat and related grains in individuals carrying HLA-DQ2 and/or HLA-DQ8 genes. In comparison to HLA-DQ8, a higher HLA-DQ2 prevalence is reported in European population where wheat has been the staple food for thousands of years. In non-European population, this pattern of HLA-DQ CD-predisposing gene distribution has not always been found. The aim of this study was to evaluate the HLA-DQ2 and HLA-DQ8 distribution in the native low-gluten consuming southern Indian population. METHODS Overall, 211 dried blood spots (DBS) were collected from native southern Indian individuals. HLA-DQ characterization and the determination of homozygous/heterozygous status were performed using commercially available HLA-DQ typing kits. RESULTS Of 211 collected DBS, 88 (42%, 95% CI: 36-48) were positive for HLA-DQ2 and/or HLA-DQ8 heterodimers. Overall, 40 (19%, 95% CI: 14-24) samples typed positive for HLA-DQ2 and 48 (23%, 95% CI: 18-28) typed positive for HLA-DQ8 genotypes. Of 40 HLA-DQ2-positive individuals, only one subject tested homozygous for the DQB1*02 allele. CONCLUSIONS In the southern Indian native general population, the prevalence of HLA-DQ8 is higher in comparison to HLA-DQ2 prevalence. This finding could be related to the delayed introduction of wheat in the diet of the southern Indian population.
Collapse
Affiliation(s)
- Anil K Verma
- Celiac Disease Research Laboratory, Department of Pediatrics, Università Politecnica delle Marche, 60123, Ancona, Italy.
| | - John Mechenro
- SRM Institute of Gastroenterology, Hepatobiliary Sciences and Transplantation, SIMS Hospital, Jawaharlal Nehru Road, Vadapalani, Chennai, 600 026, India.,Department of Medical Research, SRM Medical College Hospital and Research Centre, Kancheepuram District, Kattankulathur, 603 211, India
| | - Chiara Monachesi
- Celiac Disease Research Laboratory, Department of Pediatrics, Università Politecnica delle Marche, 60123, Ancona, Italy
| | - Giriprasad Venugopal
- SRM Institute of Gastroenterology, Hepatobiliary Sciences and Transplantation, SIMS Hospital, Jawaharlal Nehru Road, Vadapalani, Chennai, 600 026, India.,Department of Medical Research, SRM Medical College Hospital and Research Centre, Kancheepuram District, Kattankulathur, 603 211, India
| | - Giulia Naspi Catassi
- Department of Pediatrics, Università Politecnica delle Marche, 60123, Ancona, Italy
| | - Elena Lionetti
- Department of Pediatrics, Università Politecnica delle Marche, 60123, Ancona, Italy
| | - Balakrishnan S Ramakrishna
- SRM Institute of Gastroenterology, Hepatobiliary Sciences and Transplantation, SIMS Hospital, Jawaharlal Nehru Road, Vadapalani, Chennai, 600 026, India.,Department of Medical Research, SRM Medical College Hospital and Research Centre, Kancheepuram District, Kattankulathur, 603 211, India
| | - Carlo Catassi
- Department of Pediatrics, Università Politecnica delle Marche, 60123, Ancona, Italy.,The Division of Pediatric Gastroenterology and Nutrition and Center for Celiac Research, Mass General Hospital for Children, Boston, MA, 02114, USA
| |
Collapse
|
3
|
Synergetic Interaction of HLA-DRB1*07 Allele and TNF-Alpha - 863 C/A Single Nucleotide Polymorphism in the Susceptibility to Systemic Lupus Erythematosus. Indian J Clin Biochem 2021; 36:59-66. [PMID: 33505128 DOI: 10.1007/s12291-019-00854-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Accepted: 10/09/2019] [Indexed: 10/25/2022]
Abstract
Systemic lupus erythematosus (SLE) is an inflammatory autoimmune disease which is characterized by dysregulation of various cytokines propagating the inflammatory processes that is responsible for tissue damage. Tumor necrosis factor alpha (TNF-α) is one of the most important immunoregulatory cytokines that has been implicated in the different autoimmune diseases including SLE. Two hundred and two patients with SLE and 318 controls were included in the study. The TNF-α gene promoter region (from - 250 to - 1000 base pairs) was analyzed by direct Sanger's DNA sequencing method to find promoter variants associated with South Indian SLE patients. We have analyzed six TNF-α genetic polymorphisms including, - 863C/A (rs1800630), - 857C/T (rs1799724), - 806C/T (rs4248158), - 646G/A (rs4248160), - 572A/C (rs4248161) and - 308G/A (rs1800629) in both SLE patients and controls. We did not find association of TNF-α gene promoter SNPs with SLE patients. However, the - 863A (rs1800630) allele showed association with lupus nephritis phenotype in patients with SLE (OR: 1.62, 95%CI 1.04-2.53, P = 0.034). We found serum TNF-α level was significantly elevated in SLE cases as compared to control and found no association with any of the polymorphisms. The haplotype analysis revealed a significant protective association between the wild TNF-α alleles at positions - 863C, - 857C, - 806C, - 646G, - 572A and - 308G (CCCGAG) haplotype with lupus nephritis phenotype (OR 0.53, 95% CI 0.35-0.82, P = 0.004). Additionally, the TNF-α - 863 C/A (rs1800630) polymorphism and HLA-DRB1*07 haplotype showed significant differences between SLE patients and controls (OR 4.79, 95% CI 1.73-13.29, P = 0.0009). In conclusion, TNF-α - 863A allele (rs1800630) polymorphism is associated with increased risk of nephritis in South Indian SLE patients. We also found an interaction between HLA-DRB1*07 allele with TNF-α - 863 C/A promoter polymorphism giving supportive evidence for the tight linkage disequilibrium between TNF-α promoter SNPs and MHC class II DRB1 alleles.
Collapse
|
4
|
Rangasamy N, Chinniah R, Ravi PM, Vijayan M, Sivanadham R, K V D, Pandi S, Sevak V, Krishnan P, Karuppiah B. HLA-DRB1* and DQB1* allele and haplotype diversity in eight tribal populations: Global affinities and genetic basis of diseases in South India. INFECTION GENETICS AND EVOLUTION 2020; 89:104685. [PMID: 33359263 DOI: 10.1016/j.meegid.2020.104685] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 12/18/2020] [Accepted: 12/19/2020] [Indexed: 12/21/2022]
Abstract
The distribution of HLA class-II DRB1* and DQB1* alleles/ haplotypes were studied in 438 individuals of 8 Dravidian tribal groups inhabiting the Western Ghats, south India. The HLA typing was performed by PCR-SSP method. In order to identify the 5-locus Ancestral Extended Haplotypes (AEH), the alleles of HLA-A, -B and -C loci were typed for DNAs with predominant 2-locus haplotypes. The analyses have revealed allele HLA-DRB1*15 as the most predominant allele (Lowest / Highest range: Urali, 14.81 / Malasar, 48.94), followed by the alleles DRB1*10 (Katunayakan, 1.85 / Paliyan, 48.21), DRB1*14 (Paliyan 4.46 / Katunayakan, 40.74), DRB1*12 (Mannan, 1.64 / Katunayakan, 20.37) and DRB1*03 (Mannan, 1.64 / Urali, 29.63). The most frequent DQB1* alleles were DQB1*02 (Paliyan 3.57 / Urali, 23.15), DQB1*05 (Katunayakan, 27.77 / Paliyan 84.82) and DQB1*06 (Malasar, 8.51 / Kuruman, 33.51). The most predominant two-locus haplotypes observed were DRB1*15-DQB1*05, DRB1*10-DQB1*05, DRB1*15-DQB1*06 and DRB1*04-DQB1*05. The present study of HLA immunogenetics of south Indian tribes have revealed the presence of globally shared two and 5-locus haplotypes. Many of these haplotypes were implicated in a number of diseases in south India. We observed the presence of ancestral extended haplotypes (AEHs), hitherto not reported in Indian populations such as, A*68-B*35-C*02-DRB1*15:01-DQB1*05:01, A*24-B*57-C*06-DRB1*04:01-DQB1*05:01 and A*24-B*35-C*02-DRB1*15:01-DQB1*05:02. The dendrogram based phylogenetic analyses have revealed the Caucasian affinity of Urali, palaeo-Mediterranean and Indo-European affinity of Malasar tribes. The presence of globally shared susceptible and protective haplotypes reiterated the mosaic immunogenetic fabric of south Indian tribes.
Collapse
Affiliation(s)
- Nandakumar Rangasamy
- PG & Research Department of Zoology, Periyar EVR College, Tiruchirappalli 620023, Tamil Nadu, India
| | - Rathika Chinniah
- Department of Immunology, Madurai Kamaraj University, Madurai 625021, India
| | - Padma-Malini Ravi
- Department of Immunology, Madurai Kamaraj University, Madurai 625021, India
| | - Murali Vijayan
- Department of Internal Medicine, Texas Tech University Health Sciences Center, Lubbock, Texas 79430, USA
| | | | - Darsa K V
- Department of Environmental Studies, Madurai Kamaraj University, Madurai 625021, Tamil Nadu, India
| | - Sasiharan Pandi
- Department of Immunology, Madurai Kamaraj University, Madurai 625021, India
| | - Vandit Sevak
- Department of Immunology, Madurai Kamaraj University, Madurai 625021, India
| | - Prabhakaran Krishnan
- PG & Research Department of Zoology, Periyar EVR College, Tiruchirappalli 620023, Tamil Nadu, India
| | | |
Collapse
|
5
|
Kamaraj R, Balakrishnan K, Dhivakar M, Rathika C, Albert C, Justinkumar P, Navaneethakannan K. Distribution of HLA Alleles and Haplotypes in Tamil-Speaking South Indian Populations: Affinities with Spanish and Austronesian. RUSS J GENET+ 2020. [DOI: 10.1134/s1022795420090100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
6
|
Giriprasad V, Mechenro J, Balamurugan R, Ramakrishna BS. Frequency of HLA celiac disease risk alleles and haplotypes in healthy adults in Tamil Nadu. Indian J Gastroenterol 2019; 38:178-182. [PMID: 31025255 DOI: 10.1007/s12664-019-00947-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Accepted: 02/13/2019] [Indexed: 02/04/2023]
Abstract
Celiac disease (CeD) occurs only in individuals who are able to express human leukocyte antigens (HLA) DQ2 or DQ8, and these are expressed in nearly a third of healthy people in the West. As the disease is very uncommon in Tamil Nadu, we evaluated the possibility that the relevant genes are infrequent in this population. Four hundred healthy adults without any gastrointestinal abnormalities were recruited from Vellore district of Tamil Nadu. Genomic DNA was extracted from venous blood and amplified by PCR using the allele-specific primers for the following alleles-DQA1*0201, 0301, and 0501 and DQB1*02, 0201, and 0302, which determine the CeD risk haplotypes. Among the 400 healthy adults, the presence of DQ2.5 (DQB1*0201-DQA1*0501) and DQ2.2 (DQB1*02-DQA1*0201) haplotypes was found in 8.25% and 14.25%, respectively. DQ8 (DQB1*0302-DQA1*0301) haplotype was identified in only 3% of healthy individuals. Overall, approximately a quarter of healthy adults in Tamil Nadu had the potential CeD risk haplotypes of HLA DQ2.5, DQ2.2, and DQ8.
Collapse
Affiliation(s)
- Venugopal Giriprasad
- Institute of Gastroenterology, SRM Institutes for Medical Science, Jawaharlal Nehru Road, Vadapalani, Chennai, 600 026, India.,Department of Medical Research, SRM Medical College Hospital and Research Centre, SRM Institute of Science and Technology, Kattankulathur, 603 203, India
| | - John Mechenro
- Institute of Gastroenterology, SRM Institutes for Medical Science, Jawaharlal Nehru Road, Vadapalani, Chennai, 600 026, India.,Department of Medical Research, SRM Medical College Hospital and Research Centre, SRM Institute of Science and Technology, Kattankulathur, 603 203, India
| | - Ramadass Balamurugan
- All India Institute of Medical Sciences, Sijua, Patrapada, Bhubaneswar, 751 019, India
| | - Balakrishnan S Ramakrishna
- Institute of Gastroenterology, SRM Institutes for Medical Science, Jawaharlal Nehru Road, Vadapalani, Chennai, 600 026, India. .,Department of Medical Research, SRM Medical College Hospital and Research Centre, SRM Institute of Science and Technology, Kattankulathur, 603 203, India.
| |
Collapse
|
7
|
Abstract
Celiac disease, once thought to be very uncommon in Asia, is now emerging in many Asian countries. Although the absolute number of patients with celiac disease at present is not very high, this number is expected to increase markedly over the next few years/decades owing to increasing awareness. It is now that the medical community across the Asia should define the extent of the problem and prepare to handle the impending epidemic of celiac disease in Asia.
Collapse
Affiliation(s)
- Govind K Makharia
- Department of Gastroenterology and Human Nutrition, All India Institute of Medical Sciences, Ansari Nagar, New Delhi 110029, India.
| | - Carlo Catassi
- Department of Pediatrics, Center for Celiac Research, Università Politecnica delle Marche, Piazzale Martelli Raffaele, 8, Ancona, Ancona 60121, Italy; Division of Pediatric Gastroenterology, Massachussets General Hospital, Boston, MA 33131, USA
| |
Collapse
|
8
|
Seshasubramanian V, Manisekar NK, Sathishkannan AD, Naganathan C, Nandakumar Y, Narayan S. Malayalam speaking population from South India: Common five‐locus haplotypes in Malayalam speaking population. HLA 2018; 92:432-434. [DOI: 10.1111/tan.13389] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Revised: 08/17/2018] [Accepted: 09/06/2018] [Indexed: 11/26/2022]
|
9
|
Seshasubramanian V, Manisekar NK, Sathishkannan AD, Naganathan C, Nandakumar Y, Narayan S. Urdu speaking population from South India: Six extended haplotypes in linkage disequilibrium in Urdu Speaking Population. HLA 2018; 92:266-268. [DOI: 10.1111/tan.13326] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Revised: 06/18/2018] [Accepted: 06/21/2018] [Indexed: 11/30/2022]
Affiliation(s)
| | | | | | | | | | - S. Narayan
- Jeevan Stem Cell Foundation; Chennai India
| |
Collapse
|
10
|
Seshasubramanian V, Manisekar NK, Sathishkannan AD, Naganathan C, Nandakumar Y, Narayan S. Kannadigas from South India: Putatively unique five-locus haplotypes among the Kannadigas of South India. HLA 2018; 92:193-195. [DOI: 10.1111/tan.13324] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2018] [Revised: 06/18/2018] [Accepted: 06/21/2018] [Indexed: 10/28/2022]
Affiliation(s)
| | | | | | | | | | - S. Narayan
- Jeevan Stem Cell Foundation; Chennai India
| |
Collapse
|
11
|
Shivaprasad C, Kolly A, Pulikkal A, Kumar KMP. High prevalence of organ specific autoantibodies in Indian type 1 diabetic patients. J Pediatr Endocrinol Metab 2017; 30:707-712. [PMID: 28672742 DOI: 10.1515/jpem-2017-0011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2017] [Accepted: 05/09/2017] [Indexed: 01/28/2023]
Abstract
BACKGROUND Type 1 diabetes (T1D) is frequently associated with other autoimmune conditions such as autoimmune thyroiditis, coeliac disease (CD) and Addison's disease. There are sparse data on the prevalence of antibodies against these conditions in Indian patients with T1D. This study aims to evaluate prevalence of these T1D associated autoantibodies in Indian patients. METHODS Two hundred and fifty-eight patients with T1D were recruited from the Bangalore Diabetes Hospital and the Vydehi Institute of Medical Sciences and Research Centre (VIMS) for the study. Participants diagnosed with diabetes before the age of 18 years, as per the American Diabetes Association (ADA) criteria, and who were classified as T1D based on clinical grounds were recruited for the study. Anti-thyroid peroxidase antibody (TPO) and IgA tissue transglutaminase antibody (tTG) were estimated in all the patients. 21-Hydroxylase antibody (21-OHAb) were estimated in 170 patients. All assays were done by commercial immunoassay. Eighty-eight unrelated age-matched healthy controls were chosen for comparison. RESULTS The mean age of T1D patients was 14.33 years. The mean duration of diabetes was 4.88 years. Anti-TPO was positive in 43 (16.7%) patients with T1D as compared to 3 (3.4%) in controls. IgA tTG was positive in 12 (4.65%) patients with T1D and was absent in controls. 21-OHAb was positive in two (1.1%) patients with T1D and was absent in controls. Both patients who had positive 21-OHab had the other two antibodies. Five patients had positive anti-TPO and IgA-tTG antibodies. CONCLUSIONS Anti-TPO antibody was the most prevalent antibody in patients with T1D. Anti-TPO and IgA-tTG antibodies were significantly higher than in the control population. Further studies will be required to assess the clinical significance of these positive antibodies.
Collapse
|
12
|
Chinniah R, Vijayan M, Thirunavukkarasu M, Mani D, Raju K, Ravi PM, Sivanadham R, C K, N M, Karuppiah B. Polymorphic Alu Insertion/Deletion in Different Caste and Tribal Populations from South India. PLoS One 2016; 11:e0157468. [PMID: 27315142 PMCID: PMC4912101 DOI: 10.1371/journal.pone.0157468] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Accepted: 05/31/2016] [Indexed: 11/18/2022] Open
Abstract
Seven human-specific Alu markers were studied in 574 unrelated individuals from 10 endogamous groups and 2 hill tribes of Tamil Nadu and Kerala states. DNA was isolated, amplified by PCR-SSP, and subjected to agarose gel electrophoresis, and genotypes were assigned for various Alu loci. Average heterozygosity among caste populations was in the range of 0.292-0.468. Among tribes, the average heterozygosity was higher for Paliyan (0.3759) than for Kani (0.2915). Frequency differences were prominent in all loci studied except Alu CD4. For Alu CD4, the frequency was 0.0363 in Yadavas, a traditional pastoral and herd maintaining population, and 0.2439 in Narikuravars, a nomadic gypsy population. The overall genetic difference (Gst) of 12 populations (castes and tribes) studied was 3.6%, which corresponds to the Gst values of 3.6% recorded earlier for Western Asian populations. Thus, our study confirms the genetic similarities between West Asian populations and South Indian castes and tribes and supported the large scale coastal migrations from Africa into India through West Asia. However, the average genetic difference (Gst) of Kani and Paliyan tribes with other South Indian tribes studied earlier was 8.3%. The average Gst of combined South and North Indian Tribes (CSNIT) was 9.5%. Neighbor joining tree constructed showed close proximity of Kani and Paliyan tribal groups to the other two South Indian tribes, Toda and Irula of Nilgiri hills studied earlier. Further, the analysis revealed the affinities among populations and confirmed the presence of North and South India specific lineages. Our findings have documented the highly diverse (micro differentiated) nature of South Indian tribes, predominantly due to isolation, than the endogamous population groups of South India. Thus, our study firmly established the genetic relationship of South Indian castes and tribes and supported the proposed large scale ancestral migrations from Africa, particularly into South India through West Asian corridor.
Collapse
Affiliation(s)
- Rathika Chinniah
- Department of Immunology, School of Biological Sciences, Madurai Kamaraj University, Madurai, 625 021, Tamil Nadu, India
| | - Murali Vijayan
- Department of Biotechnology & Genetic Engineering, School of Biotechnology, Bharathidasan University, Tiruchirappalli, 620 024, Tamil Nadu, India
| | - Manikandan Thirunavukkarasu
- Department of Biotechnology & Genetic Engineering, School of Biotechnology, Bharathidasan University, Tiruchirappalli, 620 024, Tamil Nadu, India
| | - Dhivakar Mani
- Department of Immunology, School of Biological Sciences, Madurai Kamaraj University, Madurai, 625 021, Tamil Nadu, India
| | - Kamaraj Raju
- Department of Immunology, School of Biological Sciences, Madurai Kamaraj University, Madurai, 625 021, Tamil Nadu, India
| | - Padma Malini Ravi
- Department of Immunology, School of Biological Sciences, Madurai Kamaraj University, Madurai, 625 021, Tamil Nadu, India
| | - Ramgopal Sivanadham
- Department of Immunology, School of Biological Sciences, Madurai Kamaraj University, Madurai, 625 021, Tamil Nadu, India
| | - Kandeepan C
- Department of Zoology, A.P.A.College of Arts & Culture, Palani, 624 601, Tamil Nadu, India
| | - Mahalakshmi N
- Regional Forensic Science Laboratory, Madurai, 625 020, Tamil Nadu, India
| | - Balakrishnan Karuppiah
- Department of Immunology, School of Biological Sciences, Madurai Kamaraj University, Madurai, 625 021, Tamil Nadu, India
- * E-mail:
| |
Collapse
|
13
|
Pulikkal AA, Kolly A, Prasanna Kumar KM, Shivaprasad C. The seroprevalence of immunoglobulin A transglutaminase in type 1 diabetic patients of South Indian origin. Indian J Endocrinol Metab 2016; 20:233-237. [PMID: 27042421 PMCID: PMC4792026 DOI: 10.4103/2230-8210.176359] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
CONTEXT Celiac disease (CD) is a commonly encountered autoimmune condition in patients with type 1 diabetes (T1D). There is sparse data on the seroprevalence of immunoglobulin A (IgA) transglutaminase (tTG) in T1D patients of South Indian origin. AIMS To detect the prevalence of IgA tTG in T1D patients of South Indian origin. To evaluate the relation between the presence of autoimmunity and metabolic control and complications of diabetes. MATERIALS AND METHODS We conducted a cross-sectional study on 258 T1D patients. All the patients were subjected to biochemical tests and evaluated for microvascular complications. IgA tTG was estimated by ELISA. IgA tTG levels >40 AU/ml was considered positive. RESULTS Of the 258 participants, 12 (4.65%) were found to be positive for IgA tTG antibodies. Distribution of IgA positivity was equal in both sexes. There was a significant negative correlation of IgA tTG positivity with hemoglobin and glycated hemoglobin (HbA1c). CONCLUSIONS The seropositivity of CD in South Indian patients with T1D has been observed to be 4.68%. This is much lower compared to studies from North India. This can be explained by both the genetic and dietary factors. The seropositivity correlated negatively with hemoglobin and HbA1c.
Collapse
Affiliation(s)
- Annie A. Pulikkal
- Department of Endocrinology and Metabolism, Vydehi Institute of Medical Sciences, Bengaluru, Karnataka, India
| | - Anish Kolly
- Department of Endocrinology and Metabolism, Vydehi Institute of Medical Sciences, Bengaluru, Karnataka, India
| | | | - C. Shivaprasad
- Department of Endocrinology and Metabolism, Vydehi Institute of Medical Sciences, Bengaluru, Karnataka, India
| |
Collapse
|
14
|
Ramakrishna BS, Makharia GK, Chetri K, Dutta S, Mathur P, Ahuja V, Amarchand R, Balamurugan R, Chowdhury SD, Daniel D, Das A, George G, Gupta SD, Krishnan A, Prasad JH, Kaur G, Pugazhendhi S, Pulimood A, Ramakrishna K, Verma AK. Prevalence of Adult Celiac Disease in India: Regional Variations and Associations. Am J Gastroenterol 2016; 111:115-23. [PMID: 26729543 DOI: 10.1038/ajg.2015.398] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Revised: 10/06/2015] [Accepted: 11/01/2015] [Indexed: 12/11/2022]
Abstract
OBJECTIVES Although celiac disease (CeD) affects 1% of people in the northern part of India, it is believed to be uncommon in the southern and northeastern parts because of significant differences in dietary pattern and ethnicity. We estimated the prevalence of CeD in these three populations. In a subset, we also investigated differences in the prevalence of HLA-DQ 2/8 allelotype and dietary grain consumption. METHODS A total of 23,331 healthy adults were sampled from three regions of India-northern (n=6207), northeastern (n=8149), and southern (n=8973)-and screened for CeD using IgA anti-tissue transglutaminase antibody. Positive tests were reconfirmed using a second ELISA. CeD was diagnosed if the second test was positive and these participants were further investigated. A subsample of participants was tested for HLA-DQ2/-DQ8 and underwent detailed dietary evaluation. RESULTS Age-adjusted prevalence of celiac autoantibodies was 1.23% in northern, 0.87% in northeastern, and 0.10% in southern India (P<0.0001). Prevalence of CeD and latent CeD, respectively, was 8.53/1,000 and 3.70/1,000 in northern, 4.66/1,000 and 3.92/1,000 in northeastern, and 0.11/1,000 and 1.22/1,000 in the southern part. The population prevalence of genes determining HLA-DQ2 and/or -DQ8 expression was 38.1% in northern, 31.4% in northeastern, and 36.4% in southern India. Mean daily wheat intake was highest in northern (455 g) compared with northeastern (37 g) or southern part (25 g), whereas daily rice intake showed an inverse pattern. CONCLUSIONS CeD and latent CeD were most prevalent in northern India and were the least in southern India. The prevalence correlated with wheat intake and did not reflect differences in the genetic background.
Collapse
Affiliation(s)
- B S Ramakrishna
- Department of Gastrointestinal Sciences, Christian Medical College, Vellore, India
| | - Govind K Makharia
- Department of Gastroenterology and Human Nutrition, All India Institute of Medical Sciences, New Delhi, India
| | - Kamal Chetri
- Department of Gastroenterology, International Hospital, Guwahati, India
| | | | | | - Vineet Ahuja
- Department of Gastroenterology and Human Nutrition, All India Institute of Medical Sciences, New Delhi, India
| | - Ritvik Amarchand
- Department of Community Medicine, All India Institute of Medical Sciences, New Delhi, India
| | - Ramadass Balamurugan
- Department of Gastrointestinal Sciences, Christian Medical College, Vellore, India
| | - Sudipta D Chowdhury
- Department of Gastrointestinal Sciences, Christian Medical College, Vellore, India
| | - Dolly Daniel
- Department of Transfusion Medicine, Christian Medical College, Vellore, India
| | - Anup Das
- Department of Medicine, Guwahati Medical College, Guwahati, India
| | - Gemlyn George
- Department of Gastrointestinal Sciences, Christian Medical College, Vellore, India
| | | | - Anand Krishnan
- Department of Community Medicine, All India Institute of Medical Sciences, New Delhi, India
| | - Jasmin H Prasad
- Department of Community Health, Christian Medical College, Vellore, India
| | - Gurvinder Kaur
- Department of Transfusion Medicine and Immunohematology, All India Institute of Medical Sciences, New Delhi, India
| | | | - Anna Pulimood
- Department of Gastrointestinal Sciences, Christian Medical College, Vellore, India
| | - Kartik Ramakrishna
- Department of Gastrointestinal Sciences, Christian Medical College, Vellore, India
| | - Anil K Verma
- Department of Gastrointestinal Sciences, Christian Medical College, Vellore, India
| |
Collapse
|
15
|
Pitchappan RM. Not all the infected develop the disease - A "Lotus and Cactus" model. INFECTION GENETICS AND EVOLUTION 2015; 40:303-309. [PMID: 26611827 DOI: 10.1016/j.meegid.2015.11.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Revised: 11/07/2015] [Accepted: 11/09/2015] [Indexed: 10/22/2022]
Abstract
The immunogenetic dictum "not all the infected develop the disease" can best be explained by a "Lotus and Cactus" model. Lotuses grow in ponds and cacti in deserts: analogously, we can say that tubercle patient's lung (genetic makeup) functions as an ideal 'broth' for Mycobacterium tuberculosis (M.tb) germs to grow, but not the lungs of an endemic control. HLA association studies from Europe to Asia since 1983 till date, have shown a persistent HLA DR2 (15) association. Further, HLA DR2 and non-DR2 endemic controls showed disparate patterns of immune responses and gene expressions. The host and pathogen MHC diversities, Th1-Th2 paradigm and cytokine circuits all may play a crucial role in TB susceptibility. It is possible to decipher the protective immunity by controlling the known confounders - epidemiological, demographic, socio-biological and also host and pathogen diversities. This has become significant with our understanding on the 'out of Africa' migration and neolithic co-dispersal of M.tb with modern human. Divergence and expansion of various MHCs (eg HLA-DRB1*15, HLA-B*57) and non-MHC alleles in various continents might be responsible for the skewed transmission and distribution of the infectious diseases around the globe. The 'Lotus and Cactus' model proposed here exemplifies this. A holistic genetic epidemiology approach employing modern tools is the need of the hour to better understand infectious disease susceptibility.
Collapse
Affiliation(s)
- Ramasamy M Pitchappan
- Chettinad Academy of Research & Education, OMR Road, Kelambakkam, (Chennai), Tamil Nadu 603103, India
| |
Collapse
|
16
|
Lionetti E, Gatti S, Pulvirenti A, Catassi C. Celiac disease from a global perspective. Best Pract Res Clin Gastroenterol 2015; 29:365-79. [PMID: 26060103 DOI: 10.1016/j.bpg.2015.05.004] [Citation(s) in RCA: 104] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Revised: 04/28/2015] [Accepted: 05/07/2015] [Indexed: 01/31/2023]
Abstract
Celiac disease (CD) is one of the commonest lifelong disorders in countries populated by individuals of European origin, affecting approximately 1% of the general population. This is a common disease also in North Africa, Middle East and India. The widespread diffusion of CD is not surprising given that its causal factors (HLA predisposing genotypes and consumption of gluten-containing cereals) show a worldwide distribution. Further studies are needed to quantify the incidence of CD in apparently "celiac-free" areas such as Sub-Saharan Africa and Far East. Several reports have shown that CD is increasing in frequency in different geographic areas. Genetic factors do not explain the rising incidence during the last decades; environmental or lifestyle factors may be responsible for these changes over time. The majority of patients with CD are still undiagnosed all over the world, leading to debate about the need of screening program.
Collapse
Affiliation(s)
- Elena Lionetti
- Department of Paediatrics, University of Catania, Via S. Sofia 78, 95124 Catania, Italy.
| | - Simona Gatti
- Department of Paediatrics, Marche Polytechnic University, Ancona, Via Corridoni 11, 60123 Ancona, Italy.
| | - Alfredo Pulvirenti
- Department of Clinical and Molecular Biomedicine, University of Catania, Via S. Sofia 78, 95124 Catania, Italy.
| | - Carlo Catassi
- Department of Paediatrics, Marche Polytechnic University, Ancona, Via Corridoni 11, 60123 Ancona, Italy; The Division of Paediatric Gastroenterology and Nutrition, Center for Celiac Research, MassGeneral Hospital for Children, 55 Fruit Street, Boston, MA 02114, USA.
| |
Collapse
|
17
|
Pandit L, Malli C, Singhal B, Wason J, Malik O, Sawcer S, Ban M, D’Cunha A, Mustafa S. HLA associations in South Asian multiple sclerosis. Mult Scler 2015; 22:19-24. [DOI: 10.1177/1352458515581439] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2015] [Accepted: 03/15/2015] [Indexed: 11/16/2022]
Abstract
Background: Previous efforts to identify Human Leukocyte Antigen (HLA) gene associations with multiple sclerosis (MS) in the South Asian population have been underpowered. Aim: To identify the primary HLA class II alleles associated with MS in Indians. Methods: We typed HLA-DRB1, -DQA1 and -DQB1 in 419 patients and 451 unrelated controls by polymerase chain reaction using sequence specific oligonucleotide probes (PCR-SSOP). Results: At the gene level DRB1 showed significant evidence of association ( p=0.0000012), DQA1 showed only marginal evidence of association ( p=0.04) and there was no evidence for association at DQB1 ( p=0.26). At the DRB1 locus association is confirmed with the *15:01 ( p=0.00002) and the *03 ( p=0.00005) alleles. Conclusion: Our study confirms that the risk effects attributable to the HLA- DRB1*15:01and DRB1*03 alleles seen in Europeans are also seen in Indians. The absence of any evidence of association with DQB1 alleles reflects the lower linkage disequilibrium between DQB1 alleles and DRB1 risk alleles present in this population, and illustrates the potential value of fine mapping signals of association in different ethnic groups.
Collapse
Affiliation(s)
- Lekha Pandit
- Center for Advanced Neurological Research, KS Hegde Medical College, Nitte University, Mangalore, Karnataka, India
| | - Chaithra Malli
- Center for Advanced Neurological Research, KS Hegde Medical College, Nitte University, Mangalore, Karnataka, India
| | - Bhim Singhal
- Bombay Hospital and Research Center, Mumbai, India
| | - James Wason
- Medical Research Council Biostatistics Unit, Cambridge, UK
| | - Omar Malik
- Division of Brain Sciences, Imperial College London, UK
| | - Stephen Sawcer
- Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
| | - Maria Ban
- Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
| | - Anitha D’Cunha
- Center for Advanced Neurological Research, KS Hegde Medical College, Nitte University, Mangalore, Karnataka, India
| | - Sharik Mustafa
- Center for Advanced Neurological Research, KS Hegde Medical College, Nitte University, Mangalore, Karnataka, India
| |
Collapse
|
18
|
Prevalence of celiac disease and celiac autoimmunity in the Toba Native Amerindian community of Argentina. Can J Gastroenterol Hepatol 2015; 29. [PMID: 26207618 PMCID: PMC4699604 DOI: 10.1155/2015/927458] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND Celiac disease (CD) is mostly recognized among subjects with a Caucasian ethnic ancestry. No studies have explored conditions predisposing Amerindians to CD. OBJECTIVE To prospectively assess environmental, genetic and serological conditions associated with CD among members of the Toba native population attending a multidisciplinary sanitary mission. METHODS An expert nutritionist determined daily gluten intake using an established questionnaire. Gene typing for the human leukocyte antigen (HLA) class II alleles was performed on DNA extracted from peripheral blood (HLA DQ2⁄DQ8 haplotype). Serum antibodies were immunoglobulin (Ig) A tissue transglutaminase (tTG) and the composite deamidated gliadin peptides⁄tTG Screen test. Positive cases were tested for IgA endomysial antibodies. RESULTS A total of 144 subjects (55% female) were screened. The estimated mean gluten consumption was 43 g⁄day (range 3 g⁄day to 185 g⁄day). Genetic typing showed that 73 of 144 (50.7%) subjects had alleles associated with CD; 69 (94.5%) of these subjects had alleles for HLA DQ8 and four had DQ2 (5.5%). Four and six subjects had antibody concentrations above the cut-off established by the authors' laboratory (>3 times the upper limit of normal) for IgA tTG and deamidated gliadin peptides⁄tTG screen, respectively. Four of these had concomitant positivity for both assays and endomysial antibodies were positive in three subjects who also presented a predisposing haplotype. CONCLUSION The present study was the first to detect CD in Amerindians. The native Toba ethnic population has very high daily gluten consumption and a predisposing genetic background. We detected subjects with persistent CD autoimmunity and, at least, three of them fulfilled serological criteria for CD diagnosis.
Collapse
|
19
|
Lionetti E, Catassi C. Co-localization of gluten consumption and HLA-DQ2 and -DQ8 genotypes, a clue to the history of celiac disease. Dig Liver Dis 2014; 46:1057-63. [PMID: 25200477 DOI: 10.1016/j.dld.2014.08.002] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Revised: 07/14/2014] [Accepted: 08/01/2014] [Indexed: 12/11/2022]
Abstract
Celiac disease is an immune-mediated disorder triggered by gluten in genetically susceptible persons. Despite its detrimental effects on human health, it has not disappeared over time. The current evolutionary theory is that celiac disease is more common in areas reached later by agricultural revolution than in countries that started consumption of wheat earlier, due to negative selection caused by celiac disease. We reviewed data on worldwide prevalence of celiac disease, wheat consumption, and frequencies of HLA-celiac-disease-predisposing-genotypes to investigate their mutual relationship. Studies assessing prevalence of celiac disease were identified through a MEDLINE search. Wheat consumption and frequencies of HLA-DQ2-DQ8 were obtained from Food and Agriculture Organization of the United Nations and allelefrequencies.net database. Correlations between celiac disease, wheat consumption, and HLA were analyzed by linear regression. We observed a significant correlation between wheat consumption and HLA DQ2 (p=0.01) and the sum of DQ2 and DQ8 (p=0.01) frequencies. Wheat consumption and HLA-DQ2 tend to co-localize in different continents. The correlation between the prevalence of celiac disease and either DQ2 and/or DQ8, or the product of DQ2+DQ8*wheat consumption was not statistically significant. Co-localization of gluten consumption and HLA-celiac-disease-predisposing-genotypes can be explained by positive selection of HLA-DQ2 genes in wheat-consuming areas, and "demic diffusion" of Middle East farmers into Europe.
Collapse
Affiliation(s)
- Elena Lionetti
- Department of Pediatrics, University of Catania, Catania, Italy.
| | - Carlo Catassi
- Department of Pediatrics, Università Politecnica delle Marche, Ancona, Italy; Division of Pediatric Gastroenterology and Nutrition and Center for Celiac Research, Massachusetts General Hospital for Children, and Celiac Program - Harvard Medical School, Boston, MA, USA
| |
Collapse
|
20
|
Gujral N, Freeman HJ, Thomson ABR. Celiac disease: prevalence, diagnosis, pathogenesis and treatment. World J Gastroenterol 2012; 18:6036-59. [PMID: 23155333 PMCID: PMC3496881 DOI: 10.3748/wjg.v18.i42.6036] [Citation(s) in RCA: 356] [Impact Index Per Article: 29.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/22/2012] [Revised: 07/27/2012] [Accepted: 08/03/2012] [Indexed: 02/06/2023] Open
Abstract
Celiac disease (CD) is one of the most common diseases, resulting from both environmental (gluten) and genetic factors [human leukocyte antigen (HLA) and non-HLA genes]. The prevalence of CD has been estimated to approximate 0.5%-1% in different parts of the world. However, the population with diabetes, autoimmune disorder or relatives of CD individuals have even higher risk for the development of CD, at least in part, because of shared HLA typing. Gliadin gains access to the basal surface of the epithelium, and interact directly with the immune system, via both trans- and para-cellular routes. From a diagnostic perspective, symptoms may be viewed as either "typical" or "atypical". In both positive serological screening results suggestive of CD, should lead to small bowel biopsy followed by a favourable clinical and serological response to the gluten-free diet (GFD) to confirm the diagnosis. Positive anti-tissue transglutaminase antibody or anti-endomysial antibody during the clinical course helps to confirm the diagnosis of CD because of their over 99% specificities when small bowel villous atrophy is present on biopsy. Currently, the only treatment available for CD individuals is a strict life-long GFD. A greater understanding of the pathogenesis of CD allows alternative future CD treatments to hydrolyse toxic gliadin peptide, prevent toxic gliadin peptide absorption, blockage of selective deamidation of specific glutamine residues by tissue, restore immune tolerance towards gluten, modulation of immune response to dietary gliadin, and restoration of intestinal architecture.
Collapse
|
21
|
Association of HLA and TNF polymorphisms with the outcome of HBV infection in the South Indian population. Genes Immun 2011; 12:552-8. [PMID: 21593777 DOI: 10.1038/gene.2011.32] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The role of host genetic factors in the pathogenesis and outcome of hepatitis B virus (HBV) infection is not well known. We assessed the association of HLA and TNF (rs361525, rs1800629, rs1799724, rs1800630 and rs1799964) polymorphisms with HBV outcome in the South Indian population. Association of HLA polymorphism was analyzed in 90 individuals from each group, that is, spontaneous recovery (SR) and chronic-HBV (C-HBV) infection. The role of TNF polymorphisms was evaluated in 150 subjects with SR and 137 patients with C-HBV infection. After adjusting for age and sex, HLA-DRB1*07:01 was strongly associated with chronicity (corrected P-value (pc) <0.005, odds ratio (OR) 3.76, 95% confidence interval (CI) 1.84-7.68). The rs1800630 genotype was associated with HBV outcome in codominant (pc<0.01, OR=1.99, 95% CI 1.30-3.05) and dominant (pc<0.01, OR=2.28, 95% CI 1.35-3.84) analyzing models after adjusting for age and sex. Similarly, the rs1799964 genotype was associated with HBV outcome in codominant (pc=0.01, OR=1.57, 95% CI 1.09-2.27) and dominant (pc<0.01, OR=2.21, 95% CI 1.27-3.83) analyzing models. Haplotype analysis (rs1799964/rs1800630/rs1799724/rs1800629/rs361525) revealed that the CACGG haplotype was strongly associated with C-HBV infection (P=0.0004). Our study suggests that inheritance of HLA and TNF polymorphisms might explain the outcome of HBV infection in the South Indian population.
Collapse
|
22
|
Chhaya S, Desai S, Saranath D. HLA polymorphisms in Sindhi community in Mumbai, India. Int J Immunogenet 2010; 37:373-7. [DOI: 10.1111/j.1744-313x.2010.00936.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
23
|
Suboptimal performance of IgG anti-tissue transglutaminase in the diagnosis of celiac disease in a tropical country. Dig Dis Sci 2010; 55:698-702. [PMID: 19333755 DOI: 10.1007/s10620-009-0789-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/07/2008] [Accepted: 03/09/2009] [Indexed: 12/18/2022]
Abstract
Serological tests using human IgA-anti-tTG have been reported to have high sensitivity and specificity in diagnosis of celiac disease. There is a paucity of data on the use of human IgG-anti-tTG in diagnosis of celiac disease. Ninety-two patients with clinical suspicion of celiac disease who underwent duodenal mucosal biopsy and celiac serology using human IgG-anti-tTG were included in this retrospective study. Diagnostic accuracy of human recombinant IgG-anti-tTG serological test for celiac disease was evaluated. Indications for celiac serological testing were diarrhea (92.3%), hypoalbuminemia (39.1%), and anemia (35.9%). Eighteen patients were diagnosed with having celiac disease and 14 (77.8%) of them were IgG-anti-tTG positive. Of the remaining 74 patients, eight (10.8%) were false-positive for IgG-anti-tTG. Sensitivity, specificity, PPV, NPV, and diagnostic accuracy of IgG-anti-tTG in celiac disease were 77.8, 89.1, 63.6, 94.2, and 87%, respectively. Human IgG-anti-tTG alone does not perform well as a diagnostic tool for celiac disease. The utility of anti-endomysial antibodies in a similar clinical setting needs to be evaluated.
Collapse
|
24
|
Gupta R, Reddy DN, Makharia GK, Sood A, Ramakrishna BS, Yachha SK, Thapa BR, Banerjee R, Anuradha S, Dutta U, Puri AS, Jain AK, Mulder CJJ, Kumar A, Boindala S. Indian task force for celiac disease: Current status. World J Gastroenterol 2009; 15:6028-33. [PMID: 20027674 PMCID: PMC2797658 DOI: 10.3748/wjg.15.6028] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
There are limited data on celiac disease (CD) from India. The limited knowledge about CD in India might be attributed to several factors. The first meeting of the Indian Task Force for Celiac Disease was held in the Asian Institute of Gastroenterology, Hyderabad, India in December 2008. The objectives of the meeting were to focus research on prevalence of CD in the wheat-eating Northern vs the rice-eating Southern Indian population, low-budget serological assays to study the underprivileged population, to involve other medical subspecialties in CD, to suggest proper legislation regarding wheat food labeling, and to organize affordable food substitutes for patients with celiac disease.
Collapse
|
25
|
Abstract
The development of sensitive and specific serological assays for celiac disease has led to a revision of the prevalence of this disease in many countries. In the Asia-Pacific region, prevalence has been determined in only a minority of countries but those with prevalence rates of 1:50-1:500 adults include Australia, Iran, Israel, New Zealand, Syria and Turkey. In contrast, celiac disease appears to be extremely rare in Japan and may be rare in China. In India, prevalence rates are high in the northern states but much lower in the southern states. In individual countries, important determinants of prevalence include the per capita consumption of wheat and the frequency of a specific human leukocyte antigen (HLA) type genetically defined as HLA-DQB1*02 (*0201 or *0202) and serologically defined as HLA-DQ2. These determinants predict low prevalence rates for celiac disease in the Pacific Islands, South-East Asia and eastern China but higher rates in countries west of India and China. There is also the potential for a rising incidence of celiac disease if traditional rice-based diets are replaced by Western-style diets with a higher content of wheat products.
Collapse
Affiliation(s)
- Adrian G Cummins
- Department of Gastroenterology and Hepatology, The Queen Elizabeth Hospital, Adelaide, South Australia, Australia.
| | | |
Collapse
|
26
|
Agrawal S, Srivastava SK, Borkar M, Chaudhuri TK. Genetic affinities of north and northeastern populations of India: inference from HLA-based study. ACTA ACUST UNITED AC 2008; 72:120-30. [PMID: 18721272 DOI: 10.1111/j.1399-0039.2008.01083.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
India is like a microcosm of the world in terms of its diversity; religion, climate and ethnicity which leads to genetic variations in the populations. As a highly polymorphic marker, the human leukocyte antigen (HLA) system plays an important role in the genetic differentiation studies. To assess the genetic diversity of HLA class II loci, we studied a total of 1336 individuals from north India using DNA-based techniques. The study included four endogamous castes (Kayastha, Mathurs, Rastogies and Vaishyas), two inbreeding Muslim populations (Shias and Sunnis) from north India and three northeast Indian populations (Lachung, Mech and Rajbanshi). A total of 36 alleles were observed at DRB1 locus in both Hindu castes and Muslims from north, while 21 alleles were seen in northeast Indians. At the DQA1 locus, the number of alleles ranged from 11 to 17 in the studied populations. The total number of alleles at DQB1 was 19, 12 and 20 in the studied castes, Muslims and northeastern populations, respectively. The most frequent haplotypes observed in all the studied populations were DRB1*0701-DQA1*0201-DQB1*0201 and DRB1*1501-DQA1*0103-DQB1*0601. Upon comparing our results with other world populations, we observed the presence of Caucasoid element in north Indian population. However, differential admixturing among Sunnis and Shias with the other north Indians was evident. Northeastern populations showed genetic affinity with Mongoloids from southeast Asia. When genetic distances were calculated, we found the north Indians and northeastern populations to be markedly unrelated.
Collapse
Affiliation(s)
- S Agrawal
- Department of Medical Genetics, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India.
| | | | | | | |
Collapse
|
27
|
Catassi C, Cobellis G. Coeliac disease epidemiology is alive and kicking, especially in the developing world. Dig Liver Dis 2007; 39:908-10. [PMID: 17720636 DOI: 10.1016/j.dld.2007.07.159] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2007] [Accepted: 07/18/2007] [Indexed: 12/11/2022]
Affiliation(s)
- C Catassi
- Department of Pediatrics, Università Politecnica delle Marche, Ancona, Italy.
| | | |
Collapse
|
28
|
Yang KL, Chu CC, Huang CH, Lin SZ, Hsu WL, Liu DW, Lin PY. Discovery of HLA-DRB1*0331 in a Taiwanese marrow donor and the importance of sequence-based typing in a rare or previously unrecognized allele. Int J Immunogenet 2007; 34:91-5. [PMID: 17373933 DOI: 10.1111/j.1744-313x.2007.00662.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
We describe here a novel HLA-DRB1* allele, DRB1*0331, observed from a Taiwanese bone marrow donor using DNA sequence-based typing (SBT) method. The 'new' allele differs from DRB1*0306 and DRB1*0325 by one nucleotide at positions 196 and 227, respectively. Nucleotide mutations caused amino acid substitutions from N to Y at codon 37 and from F to Y at codon 47, as compared with amino acid sequence encoded by the DRB1*030101 allele. The donor was first typed as DRB1*0403/0406/0439/0441/0446/0451/0452 (NMDP code DRB1*04XX) and DRB1*0304/0323/0325 (NMDP code DRB1*03APDA) by sequence-specific oligonucleotide (SSO) typing kit. Subsequent typing of the donor by high-resolution sequence-specific primer (SSP) protocol indicated DRB1*0403 and DRB1*0306. The anomalous result of DRB1*03 was resolved by SBT and recognized as DRB1*0331. We concluded that SSP or SSO alone may mistype a precedent unrecognized allele and that two different typing techniques or SBT may have to be employed to safe guard true HLA typing when rare alleles are encountered at the first time.
Collapse
Affiliation(s)
- K L Yang
- Laboratory of Immunogenetics, Tzu-Chi Stem Cells Centre, Buddhist Tzu-Chi Marrow Donor Registry, Hualien, Taiwan.
| | | | | | | | | | | | | |
Collapse
|
29
|
|
30
|
Tosh K, Ravikumar M, Bell JT, Meisner S, Hill AVS, Pitchappan R. Variation in MICA and MICB genes and enhanced susceptibility to paucibacillary leprosy in South India. Hum Mol Genet 2006; 15:2880-7. [PMID: 16923796 DOI: 10.1093/hmg/ddl229] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
In a study of mainly paucibacillary leprosy-affected sib-pair families from South India, in addition to the expected associations with the HLA-DRB1 locus, we have identified significant association with a functional variant of the MICA gene as well as a microsatellite in the flanking region of the MICB gene. The associations with MICA and MICB cannot be accounted for by linkage disequilibrium with the HLA class II locus indicating a role in genetic susceptibility to leprosy that is independent of HLA-DRB1. Previous studies have shown that MICA and MICB are expressed on the surface of cells in response to infection, where they are recognized by the NKG2D receptor on gammadelta T cells, CD8+ alphabeta T cells and natural killer cells, all of which contribute to defense against mycobacteria. The MICA*5A5.1 allele, associated here with leprosy susceptibility, encodes a protein lacking a cytoplasmic tail providing a possible mechanism for defective immune surveillance against mycobacteria.
Collapse
Affiliation(s)
- Kerrie Tosh
- The Wellcome Trust Centre for Human Genetics, Oxford, UK
| | | | | | | | | | | |
Collapse
|
31
|
Dubaniewicz A, Moszkowska G, Szczerkowska Z. Frequency of DRB1–DQB1 two-locus haplotypes in tuberculosis: Preliminary report. Tuberculosis (Edinb) 2005; 85:259-67. [PMID: 15958261 DOI: 10.1016/j.tube.2004.12.003] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2004] [Revised: 12/12/2004] [Accepted: 12/16/2004] [Indexed: 10/25/2022]
Abstract
Analysis of correlation between tuberculosis (TB) and human leukocyte antigen (HLA) in populations from Asia and Latin America has shown conflicting results. The aim of this study was to evaluate the frequency of HLA-DRB1-DQB1 two-locus haplotypes of 61 TB patients and 125 healthy volunteers in the same ethnic group in Poland. DRB1 and DQB1 alleles were determined by PCR-SSP "low-resolution" and "high-resolution" methods. Our study showed that DRB1*1601 and DQB1*0502 alleles were more frequent, whereas DQB1*0201 was rarer in TB than in controls. DRB1*16-DQB1*05, DRB1*04-DQB1*03 and DRB1*1601-DQB1*0502 haplotype were more common, and DRB1*11-DQB1*03 less frequent in TB in comparison to controls. Positive linkage disequilibrium (LD) for DRB1*01-DQB1*05, DRB1*03-DQB1*02, DRB1*11-DQB1*03, DRB1*13-DQB1*06 and DRB1*15-DQB1*06 was found in controls. A trend towards the positive LD for DRB1*01-DQB1*05, DRB1*03-DQB1*02, DRB1*11-DQB1*03, DRB1*15-DQB1*06 and DRB1*16-DQB1*05 was shown in TB. The trend towards the positive LD for DRB1*16-DQB1*05 haplotype in TB patients was not observed in the control group. It seems likely that the presence of DRB1*1601, DQB1*0502 alleles and DRB1*1601-DQB1*0502, DRB1*04-DQB1*03, DRB1*14-DQB1*05 haplotypes may be related to a higher risk of developing TB, whereas low frequency of DQB1*0201 and DRB1*11-DQB1*03 haplotype may be linked to the resistance to TB.
Collapse
Affiliation(s)
- Anna Dubaniewicz
- Department of Pathophysiology, Medical University of Gdańsk, 80-211 Gdansk, Debinki 7 Str., Poland.
| | | | | |
Collapse
|
32
|
Shankarkumar U, Sridharan B. HLA DRB1* and DQB1* allelic diversity among nadars: A primitive South Indian Dravidian caste group. Hum Immunol 2004; 65:847-54. [PMID: 15336786 DOI: 10.1016/j.humimm.2004.05.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2004] [Revised: 05/08/2004] [Accepted: 05/19/2004] [Indexed: 11/30/2022]
Abstract
South India is one of the oldest geophysical regions occupied mainly by Dravidian language-speaking people. In the present study, 84 unrelated healthy Nadar individuals from Tamil Nadu State were analyzed for human leukocyte antigen (HLA) DRB1* and DQB1* allele frequencies and their haplotype frequencies were analyzed by high resolution polymerase chain reaction (PCR)-typing of genomic DNA. Results revealed that Nadars possessed >0.1 allele frequencies of HLA DRB1*15011, 03, 04, 1404, 0701, 1001, and DQB1*0201, 03, 0501, and 0503. The highest frequencies of DRB1*0317 (0.048), DRB1*1317 (0.012), and DRB1*1404 (0.107) in the world were found among the Nadar caste. The most frequent two-locus haplotypes identified among the Nadars were DRB1*0701-DQB1*0201 and DRB1*1000-DQB1*0501, and DRB1*1404-DQB1*0503 and DRB1*15011-DQB1*0601. When compared with world populations, HLA DRB1*1322, DRB1*1434, and DQB1*0614 were identified exclusively among Nadars. The heterozygosity and Watterson's homozygosity tests indicated that balancing selection still operates among the South Indian caste groups. The hierarchical cluster analysis for DRB1 data from the Indian caste and population groups showed that the Nadars cluster with Kashmir Brahmins and North Indians. The present study shows that the Nadar caste has several unique alleles and haplotypes at high frequency that are rare or absent in other populations of India and the world.
Collapse
Affiliation(s)
- Umapathy Shankarkumar
- HLA Department, Institute of Immunohaematology (ICMR), K.E.M. Hospital, Parel, Mumbai, India.
| | | |
Collapse
|