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Hamed HM, Bostany EE, Motawie AA, Abd Al-Aziz AM, Mourad AA, Salama HM, Kamel S, Hassan EM, Helmy NA, El-Saeed GS, Elghoroury EA. The association of TMPRSS6 gene polymorphism with iron status in Egyptian children (a pilot study). BMC Pediatr 2024; 24:105. [PMID: 38341535 PMCID: PMC10858485 DOI: 10.1186/s12887-024-04573-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Accepted: 01/18/2024] [Indexed: 02/12/2024] Open
Abstract
Several studies have shown association of single nucleotide polymorphisms (SNPs) of hepcidin regulatory pathways genes with impaired iron status. The most common is in the TMPRSS6 gene. In Africa, very few studies have been reported. We aimed to investigate the correlation between the common SNPs in the transmembrane protease, serine 6 (TMPRSS6) gene and iron indicators in a sample of Egyptian children for identifying the suitable candidate for iron supplementation.Patients and methods One hundred and sixty children aged 5-13 years were included & classified into iron deficient, iron deficient anemia and normal healthy controls. All were subjected to assessment of serum iron, serum ferritin, total iron binding capacity, complete blood count, reticulocyte count, serum soluble transferrin receptor and serum hepcidin. Molecular study of TMPRSS6 genotyping polymorphisms (rs4820268, rs855791 and rs11704654) were also evaluated.Results There was an association of iron deficiency with AG of rs855791 SNP, (P = 0.01). The minor allele frequency for included children were 0.43, 0.45 & 0.17 for rs4820268, rs855791 & rs11704654 respectively. Genotype GG of rs4820268 expressed the highest hepcidin gene expression fold, the lowest serum ferroportin & iron store compared to AA and AG genotypes (p = 0.05, p = 0.05, p = 0.03 respectively). GG of rs855791 had lower serum ferritin than AA (p = 0.04), lowest iron store & highest serum hepcidin compared to AA and AG genotypes (p = 0.04, p = 0.01 respectively). Children having CC of rs11704654 had lower level of hemoglobin, serum ferritin and serum hepcidin compared with CT genotype (p = 0.01, p = 0.01, p = 0.02) respectively.Conclusion Possible contribution of SNPs (rs855791, rs4820268 and rs11704654) to low iron status.
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Grants
- 11010150 National Research Centre, Egypt
- 11010150 National Research Centre, Egypt
- 11010150 National Research Centre, Egypt
- 11010150 National Research Centre, Egypt
- 11010150 National Research Centre, Egypt
- 11010150 National Research Centre, Egypt
- 11010150 National Research Centre, Egypt
- 11010150 National Research Centre, Egypt
- 11010150 National Research Centre, Egypt
- 11010150 National Research Centre, Egypt
- 11010150 National Research Centre, Egypt
- National Research Centre Egypt
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Affiliation(s)
- Hanan M Hamed
- Pediatrics Department, National Research Centre, Dokki, Cairo, 12622, Egypt.
| | - Eman El Bostany
- Pediatrics Department, National Research Centre, Dokki, Cairo, 12622, Egypt
| | - Ayat A Motawie
- Pediatrics Department, National Research Centre, Dokki, Cairo, 12622, Egypt
| | | | - Abbass A Mourad
- Pediatrics Department, National Research Centre, Dokki, Cairo, 12622, Egypt
| | - Hassan M Salama
- Pediatrics Department, National Research Centre, Dokki, Cairo, 12622, Egypt
| | - Solaf Kamel
- Clinical and Chemical Pathology Department, National Research Centre, Dokki, Cairo, 12622, Egypt
| | - Eman M Hassan
- Clinical and Chemical Pathology Department, National Research Centre, Dokki, Cairo, 12622, Egypt
| | - Neveen A Helmy
- Clinical and Chemical Pathology Department, National Research Centre, Dokki, Cairo, 12622, Egypt
| | - Gamila S El-Saeed
- Medical Biochemistry Department, National Research Centre, Dokki, Cairo, 12622, Egypt
| | - Eman A Elghoroury
- Clinical and Chemical Pathology Department, National Research Centre, Dokki, Cairo, 12622, Egypt
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Bage IJ, Kamalanathan S, Selvarajan S, Sahoo J, Mathaiyan J, Naik D. Peroxisome Proliferator-Activated Receptor α and γ Gene Polymorphisms among South Indian Patients with Diabetic Dyslipidaemia. Indian J Endocrinol Metab 2023; 27:118-126. [PMID: 37292073 PMCID: PMC10245317 DOI: 10.4103/ijem.ijem_451_22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Revised: 02/02/2023] [Accepted: 02/15/2023] [Indexed: 06/10/2023] Open
Abstract
Background Peroxisome proliferator-activated receptors (PPAR) α and γ genes play an important role in dyslipidaemia of T2DM. Aims To estimate the frequency distribution of PPAR α and γ gene polymorphisms in South Indian T2DM patients with dyslipidaemia compared to healthy controls. Normative frequencies of SNPs were established and compared with data for 1000 genome populations. Methods Eligible 382 cases and 336 age and sex-matched controls were enrolled. Six SNPs in PPARα [rs1800206 C>G (Leu162Val), rs4253778 G>C, rs135542 T>C] and PPARγ [rs3856806 (C>T), rs10865710 (C>G), rs1805192 C>G (Pro12Ala)] genes were selected for genotyping. Results The allele and gene frequencies did not significantly differ between the diabetic dyslipidaemia cases and healthy controls. However, they were significantly different from that of 1000 genome populations except for rs1800206 C>G (Leu162Val) and rs1805192 C>G (Pro12Ala). Conclusion The studied polymorphisms in PPARα and PPARγ genes are not associated with diabetic dyslipidaemia among South Indian patients.
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Affiliation(s)
- Isaac J. Bage
- Department of Endocrinology, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Puducherry, India
| | - Sadishkumar Kamalanathan
- Department of Endocrinology, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Puducherry, India
| | - Sandhiya Selvarajan
- Department of Clinical Pharmacology, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Puducherry, India
| | - Jayaprakash Sahoo
- Department of Endocrinology, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Puducherry, India
| | - Jayanthi Mathaiyan
- Department of Pharmacology, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Puducherry, India
| | - Dukhabandhu Naik
- Department of Endocrinology, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Puducherry, India
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Rodriguez Neira JD, Peripolli E, de Negreiros MPM, Espigolan R, López-Correa R, Aguilar I, Lobo RB, Baldi F. Prediction ability for growth and maternal traits using SNP arrays based on different marker densities in Nellore cattle using the ssGBLUP. J Appl Genet 2022; 63:389-400. [PMID: 35133621 DOI: 10.1007/s13353-022-00685-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2021] [Revised: 01/25/2022] [Accepted: 02/02/2022] [Indexed: 11/25/2022]
Abstract
This study aimed to investigate the prediction ability for growth and maternal traits using different low-density customized SNP arrays selected by informativeness and distribution of markers across the genome employing single-step genomic BLUP (ssGBLUP). Phenotypic records for adjusted weight at 210 and 450 days of age were utilized. A total of 945 animals were genotyped with high-density chip, and 267 individuals born after 2008 were selected as validation population. We evaluated 11 scenarios using five customized density arrays (40 k, 20 k, 10 k, 5 k and 2 k) and the HD array was used as desirable scenario. The GEBV predictions and BIF (Beef Improvement Federation) accuracy were obtained with BLUPF90 family programs. Linear regression was used to evaluate the prediction ability, inflation, and bias of GEBV of each customized array. An overestimation of partial GEBVs in contrast with complete GEBVs and increase of BIF accuracy with the density arrays diminished were observed. For all traits, the prediction ability was higher as the array density increased and it was similar with customized arrays higher than 10 k SNPs. Level of inflation was lower as the density array increased of and was higher for MW210 effect. The bias was susceptible to overestimation of GEBVs when the density customized arrays decreased. These results revealed that the BIF accuracy is sensible to overestimation using low-density customized arrays while the prediction ability with least 10,000 informative SNPs obtained from the Illumina BovineHD BeadChip shows accurate and less biased predictions. Low-density customized arrays under ssGBLUP method could be feasible and cost-effective in genomic selection.
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Affiliation(s)
- Juan Diego Rodriguez Neira
- Departamento de Zootecnia, Faculdade de Ciências Agrarias e Veterinárias, Universidade Estadual Paulista (Unesp), Jaboticabal, 14884-900, Brazil.
| | - Elisa Peripolli
- Departamento de Zootecnia, Faculdade de Ciências Agrarias e Veterinárias, Universidade Estadual Paulista (Unesp), Jaboticabal, 14884-900, Brazil
| | - Maria Paula Marinho de Negreiros
- Departamento de Medicina Veterinária, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo (Usp), Pirassununga, 13535-900, Brazil
| | - Rafael Espigolan
- Departamento de Medicina Veterinária, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo (Usp), Pirassununga, 13535-900, Brazil
| | - Rodrigo López-Correa
- Departamento de Genética y Mejoramiento Animal, Facultad de Veterinaria, Universidad de La República, Montevideo, Uruguay
| | - Ignacio Aguilar
- Instituto Nacional de Investigación Agropecuaria (INIA), Montevideo, Uruguay
| | - Raysildo B Lobo
- Associação Nacional de Criadores e Pesquisadores (ANCP), Ribeirão Preto, Brazil
| | - Fernando Baldi
- Departamento de Zootecnia, Faculdade de Ciências Agrarias e Veterinárias, Universidade Estadual Paulista (Unesp), Jaboticabal, 14884-900, Brazil
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Mdyogolo S, MacNeil MD, Neser FWC, Scholtz MM, Makgahlela ML. Assessing accuracy of genotype imputation in the Afrikaner and Brahman cattle breeds of South Africa. Trop Anim Health Prod 2022; 54:90. [PMID: 35133512 DOI: 10.1007/s11250-022-03102-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Accepted: 02/01/2022] [Indexed: 11/26/2022]
Abstract
Imputation may be used to rescue genomic data from animals that would otherwise be eliminated due to a lower than desired call rate. The aim of this study was to compare the accuracy of genotype imputation for Afrikaner, Brahman, and Brangus cattle of South Africa using within- and multiple-breed reference populations. A total of 373, 309, and 101 Afrikaner, Brahman, and Brangus cattle, respectively, were genotyped using the GeneSeek Genomic Profiler 150 K panel that contained 141,746 markers. Markers with MAF ≤ 0.02 and call rates ≤ 0.95 or that deviated from Hardy Weinberg Equilibrium frequency with a probability of ≤ 0.0001 were excluded from the data as were animals with a call rate ≤ 0.90. The remaining data included 99,086 SNPs and 360 Afrikaner, 75,291 SNPs and 288 animals Brahman, and 97,897 SNPs and 99 Brangus animals. A total of 7986, 7002, and 7000 SNP from 50 Afrikaner and Brahman and 30 Brangus cattle, respectively, were masked and then imputed using BEAGLE v3 and FImpute v2. The within-breed imputation yielded accuracies ranging from 89.9 to 96.6% for the three breeds. The multiple-breed imputation yielded corresponding accuracies from 69.21 to 88.35%. The results showed that population homogeneity and numerical representation for within and across breed strategies, respectively, are crucial components for improving imputation accuracies.
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Affiliation(s)
- S Mdyogolo
- Department of Animal Breeding and Genetics, Agricultural Research Council, Irene, South Africa.
- Department of Animal, Wildlife and Grassland Sciences, University of the Free State, Bloemfontein, South Africa.
| | - M D MacNeil
- Department of Animal Breeding and Genetics, Agricultural Research Council, Irene, South Africa
- Department of Animal, Wildlife and Grassland Sciences, University of the Free State, Bloemfontein, South Africa
- Delta G, Miles City, MT, USA
| | - F W C Neser
- Department of Animal, Wildlife and Grassland Sciences, University of the Free State, Bloemfontein, South Africa
| | - M M Scholtz
- Department of Animal Breeding and Genetics, Agricultural Research Council, Irene, South Africa
- Department of Animal, Wildlife and Grassland Sciences, University of the Free State, Bloemfontein, South Africa
| | - M L Makgahlela
- Department of Animal Breeding and Genetics, Agricultural Research Council, Irene, South Africa
- Department of Animal, Wildlife and Grassland Sciences, University of the Free State, Bloemfontein, South Africa
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Kumar H, Panigrahi M, Saravanan KA, Parida S, Bhushan B, Gaur GK, Dutt T, Mishra BP, Singh RK. SNPs with intermediate minor allele frequencies facilitate accurate breed assignment of Indian Tharparkar cattle. Gene 2021; 777:145473. [PMID: 33549713 DOI: 10.1016/j.gene.2021.145473] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2020] [Revised: 01/23/2021] [Accepted: 01/28/2021] [Indexed: 10/22/2022]
Abstract
Tharparkar cattle breed is widely known for its superior milch quality and hardiness attributes. This study aimed to develop an ultra-low density breed-specific single nucleotide polymorphism (SNP) genotype panel to accurately quantify Tharparkar populations in biological samples. In this study, we selected and genotyped 72 Tharparkar animals randomly from Cattle & Buffalo Farm of IVRI, India. This Bovine SNP50 BeadChip genotypic datum was merged with the online data from six indigenous cattle breeds and five taurine breeds. Here, we used a combination of pre-selection statistics and the MAF-LD method developed in our laboratory to analyze the genotypic data obtained from 317 individuals of 12 distinct breeds to identify breed-informative SNPs for the selection of Tharparkar cattle. This methodology identified 63 unique Tharparkar-specific SNPs near intermediate gene frequencies. We report several informative SNPs in genes/QTL regions affecting phenotypes or production traits that might differentiate the Tharparkar breed.
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Affiliation(s)
- Harshit Kumar
- Division of Animal Genetics, Indian Veterinary Research Institute, Izatnagar, Bareilly 243122, UP, India
| | - Manjit Panigrahi
- Division of Animal Genetics, Indian Veterinary Research Institute, Izatnagar, Bareilly 243122, UP, India.
| | - K A Saravanan
- Division of Animal Genetics, Indian Veterinary Research Institute, Izatnagar, Bareilly 243122, UP, India
| | - Subhashree Parida
- Division of Pharmacology & Toxicology, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly 243122, UP, India
| | - Bharat Bhushan
- Division of Animal Genetics, Indian Veterinary Research Institute, Izatnagar, Bareilly 243122, UP, India
| | - G K Gaur
- Division of Animal Genetics, Indian Veterinary Research Institute, Izatnagar, Bareilly 243122, UP, India
| | - Triveni Dutt
- Livestock Production and Management Section, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly 243122, UP, India
| | - B P Mishra
- Division of Animal Biotechnology, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly 243122, UP, India
| | - R K Singh
- Division of Animal Biotechnology, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly 243122, UP, India
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Smaragdov MG, Kudinov AA. Assessing the power of principal components and wright's fixation index analyzes applied to reveal the genome-wide genetic differences between herds of Holstein cows. BMC Genet 2020; 21:47. [PMID: 32345235 PMCID: PMC7189535 DOI: 10.1186/s12863-020-00848-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Accepted: 03/27/2020] [Indexed: 11/30/2022] Open
Abstract
Background Due to the advent of SNP array technology, a genome-wide analysis of genetic differences between populations and breeds has become possible at a previously unattainable level. The Wright’s fixation index (Fst) and the principal component analysis (PCA) are widely used methods in animal genetics studies. In paper we compared the power of these methods, their complementing each other and which of them is the most powerful. Results Comparative analysis of the power Principal Components Analysis (PCA) and Fst were carried out to reveal genetic differences between herds of Holsteinized cows. Totally, 803 BovineSNP50 genotypes of cows from 13 herds were used in current study. Obtained Fst values were in the range of 0.002–0.012 (mean 0.0049) while for rare SNPs with MAF 0.0001–0.005 they were even smaller in the range of 0.001–0.01 (mean 0.0027). Genetic relatedness of the cows in the herds was the cause of such small Fst values. The contribution of rare alleles with MAF 0.0001–0.01 to the Fst values was much less than common alleles and this effect depends on linkage disequilibrium (LD). Despite of substantial change in the MAF spectrum and the number of SNPs we observed small effect size of LD - based pruning on Fst data. PCA analysis confirmed the mutual admixture and small genetic difference between herds. Moreover, PCA analysis of the herds based on the visualization the results of a single eigenvector cannot be used to significantly differentiate herds. Only summed eigenvectors should be used to realize full power of PCA to differentiate small between herds genetic difference. Finally, we presented evidences that the significance of Fst data far exceeds the significance of PCA data when these methods are used to reveal genetic differences between herds. Conclusions LD - based pruning had a small effect on findings of Fst and PCA analyzes. Therefore, for weakly structured populations the LD - based pruning is not effective. In addition, our results show that the significance of genetic differences between herds obtained by Fst analysis exceeds the values of PCA. Proposed, to differentiate herds or low structured populations we recommend primarily using the Fst approach and only then PCA.
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Affiliation(s)
- M G Smaragdov
- Russian Research Institute of Farm Animal Genetics and Breeding - Branch of the l.K. Ernst Federal Science Center for Animal Husbandry, St. Petersburg, Pushkin, Russia. .,, St. Petersburg, Russian Federation.
| | - A A Kudinov
- Russian Research Institute of Farm Animal Genetics and Breeding - Branch of the l.K. Ernst Federal Science Center for Animal Husbandry, St. Petersburg, Pushkin, Russia.,Department of Agricultural Science, University of Helsinki, FI-00014, Helsinki, Finland
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Meyermans R, Gorssen W, Buys N, Janssens S. How to study runs of homozygosity using PLINK? A guide for analyzing medium density SNP data in livestock and pet species. BMC Genomics 2020; 21:94. [PMID: 31996125 PMCID: PMC6990544 DOI: 10.1186/s12864-020-6463-x] [Citation(s) in RCA: 101] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2019] [Accepted: 01/08/2020] [Indexed: 12/01/2022] Open
Abstract
Background PLINK is probably the most used program for analyzing SNP genotypes and runs of homozygosity (ROH), both in human and in animal populations. The last decade, ROH analyses have become the state-of-the-art method for inbreeding assessment. In PLINK, the --homozyg function is used to perform ROH analyses and relies on several input settings. These settings can have a large impact on the outcome and default values are not always appropriate for medium density SNP array data. Guidelines for a robust and uniform ROH analysis in PLINK using medium density data are lacking, albeit these guidelines are vital for comparing different ROH studies. In this study, 8 populations of different livestock and pet species are used to demonstrate the importance of PLINK input settings. Moreover, the effects of pruning SNPs for low minor allele frequencies and linkage disequilibrium on ROH detection are shown. Results We introduce the genome coverage parameter to appropriately estimate FROH and to check the validity of ROH analyses. The effect of pruning for linkage disequilibrium and low minor allele frequencies on ROH analyses is highly population dependent and such pruning may result in missed ROH. PLINK’s minimal density requirement is crucial for medium density genotypes and if set too low, genome coverage of the ROH analysis is limited. Finally, we provide recommendations for the maximal gap, scanning window length and threshold settings. Conclusions In this study, we present guidelines for an adequate and robust ROH analysis in PLINK on medium density SNP data. Furthermore, we advise to report parameter settings in publications, and to validate them prior to analysis. Moreover, we encourage authors to report genome coverage to reflect the ROH analysis’ validity. Implementing these guidelines will substantially improve the overall quality and uniformity of ROH analyses.
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Affiliation(s)
- R Meyermans
- Department of Biosystems, Livestock Genetics, KU Leuven, Kasteelpark Arenberg 30 - Box 2472, 3001, Leuven, Belgium
| | - W Gorssen
- Department of Biosystems, Livestock Genetics, KU Leuven, Kasteelpark Arenberg 30 - Box 2472, 3001, Leuven, Belgium
| | - N Buys
- Department of Biosystems, Livestock Genetics, KU Leuven, Kasteelpark Arenberg 30 - Box 2472, 3001, Leuven, Belgium
| | - S Janssens
- Department of Biosystems, Livestock Genetics, KU Leuven, Kasteelpark Arenberg 30 - Box 2472, 3001, Leuven, Belgium.
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Liu JL, Chen XY, Gu NN, Zhang JY, Jiang LP, Zhang D, Ren GS. Correlation study on chromogranin A genetic polymorphism and prognosis of critically ill patients. J Crit Care 2017; 39:137-42. [PMID: 28254729 DOI: 10.1016/j.jcrc.2017.02.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Revised: 01/28/2017] [Accepted: 02/01/2017] [Indexed: 11/23/2022]
Abstract
OBJECTIVE The objective was to investigate the correlation between single nucleotide polymorphism (SNP) of chromogranin A (CHGA) and prognosis of critically ill patients. METHODS We screened 357 critically ill patients consecutively admitted to our intensive care unit. The -89/-415/-462 SNP locus in the promoter region and the +9559/+9578/+9590/+9611 SNP locus in exon 7 coding of CHGA were genotyped by polymerase chain reaction and DNA sequencing technology. Subsequently, the correlation between genotype and prognosis of patients was analyzed. RESULTS (1) Three hundred critically ill Chinese Han patients were enrolled in the study. CHGA-415/-462/+9559/+9611 SNPs were polymorphically distributed. Phenotypes of the 4 SNPs were shown not to be in linkage disequilibrium, and there were no significant differences in the minor allele frequencies (MAFs) of the 4 SNPs between participants of this study and healthy people in Asia. (2) The CHGA-415 T/C MAF of the nonsurvival group was significantly higher than that of the survival group (MAF 0.3813 and 0.2864, respectively; P=.026). Survival analysis showed that there were significant differences between the CHGA-415 T/C mutation group (including TC and CC genotypes) and the wild-type group (TT genotype) (log rank=8.887, P=.003). The mortality in the mutant group was significantly higher than that in the wild-type group (0.3333 and 0.1852, respectively; P=.004). (3) Binary logistic analysis showed that CHGA-415 T/C polymorphism was an independent risk factor for the mortality of critically ill patients (odds ratio, 2.286; 95% confidence interval, 1.165-4.484; P=.016). CONCLUSIONS Critically ill patients with CHGA-415 T/C mutant genotype display higher 30-day mortality than those with the wild-type group. CHGA-415 T/C polymorphism is an independent risk factor of poor prognosis in critically ill Chinese Han patients.
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Verhulst B, Neale MC. Minor Allele Frequency Changes the Nature of Genotype by Environment Interactions. Behav Genet 2016; 46:726-733. [PMID: 27105628 DOI: 10.1007/s10519-016-9795-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2015] [Accepted: 04/11/2016] [Indexed: 01/14/2023]
Abstract
In the classical twin study, phenotypic variation is often partitioned into additive genetic (A), common (C) and specific environment (E) components. From genetical theory, the outcome of genotype by environment interaction is expected to inflate A when the interacting factor is shared (i.e., C) between the members of a twin pair. We show that estimates of both A and C can be inflated. When the shared interacting factor changes the size of the difference between homozygotes' means, the expected sibling or DZ twin correlation is .5 if and only if the minor allele frequency (MAF) is .5; otherwise the expected DZ correlation is greater than this value, consistent (and confounded) with some additional effect of C. This result is considered in the light of the distribution of minor allele frequencies for polygenic traits. Also discussed is whether such interactions take place at the locus level or affect an aggregated biological structure or system. Interactions with structures or endophenotypes that result from the aggregated effects of many loci will generally emerge as part of the A estimate.
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Affiliation(s)
- Brad Verhulst
- Virginia Institute for Psychiatric and Behavioral Genetics, Virginia Commonwealth University, Richmond, VA, USA.
| | - Michael C Neale
- Virginia Institute for Psychiatric and Behavioral Genetics, Virginia Commonwealth University, Richmond, VA, USA
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Abstract
The development of genotyping-by-sequencing (GBS) to rapidly detect nucleotide variation at the whole genome level, in many individuals simultaneously, has provided a transformative genetic profiling technique. GBS can be carried out in species with or without reference genome sequences yields huge amounts of potentially informative data. One limitation with the approach is the paucity of tools to transform the raw data into a format that can be easily interrogated at the genetic level. In this chapter we describe bioinformatics tools developed to address this shortfall together with experimental design considerations to fully leverage the power of GBS for genetic analysis.
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Affiliation(s)
- Sateesh Kagale
- National Research Council Canada, 110 Gymnasium Place, Saskatoon, SK, Canada, S7N 0W9
| | - Chushin Koh
- National Research Council Canada, 110 Gymnasium Place, Saskatoon, SK, Canada, S7N 0W9
| | - Wayne E Clarke
- Agriculture and Agri-Food Canada, 107 Science Place, Saskatoon, SK, Canada, S7N 0X2
| | - Venkatesh Bollina
- Agriculture and Agri-Food Canada, 107 Science Place, Saskatoon, SK, Canada, S7N 0X2
| | - Isobel A P Parkin
- Agriculture and Agri-Food Canada, 107 Science Place, Saskatoon, SK, Canada, S7N 0X2
| | - Andrew G Sharpe
- National Research Council Canada, 110 Gymnasium Place, Saskatoon, SK, Canada, S7N 0W9.
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Okamura K, Kawai T, Hata K, Nakabayashi K. Lists of HumanMethylation450 BeadChip probes with nucleotide-variant information obtained from the Phase 3 data of the 1000 Genomes Project. Genom Data 2015; 7:67-9. [PMID: 26981364 PMCID: PMC4778612 DOI: 10.1016/j.gdata.2015.11.023] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/13/2015] [Accepted: 11/26/2015] [Indexed: 12/21/2022]
Abstract
The Illumina's Infinium HumanMethylation450 (HM450) BeadChip array provides a simultaneous examination of DNA methylation status of more than 480,000 CpG sites in the human genome. Its relatively simple protocol is achieved by employing a hybridization methodology followed by single-base extension reactions. However, nucleotide variations among individuals in the hybridization probe sequences can affect the results, i.e. estimates of methylation levels. To investigate possible effects of maternal nutritional conditions on the extent of epigenetic alterations in utero, we examined genome-wide DNA methylation profiles of 33 chorionic villi samples collected in Japan (GEO accession number GSE62733), and revealed using Smirnov-Grubbs' outlier test that epigenetic alterations accumulate in placentas under adverse in utero environments. In that study, we compiled a list of HM450 probes overlapping with the reported nucleotide variants in the Phase 3 dataset (release 20130502) of the 1000 Genomes Project. We excluded the probes whose sequences overlapped with variants with minor allele frequency (MAF) higher than 1% in the Japanese population from identified methylation outliers, to diminish the number of outliers that could have been spuriously identified due to variants at/near the target CpG sites. We herein compiled lists of HM450 probes with MAF information of the African, European, American, South Asian and East Asian populations, in addition to the Japanese population. The provided lists are useful for methylome analyses for human populations using the HM450 BeadChip arrays.
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Affiliation(s)
- Kohji Okamura
- Department of Systems BioMedicine, National Research Institute for Child Health and Development, Tokyo 157-8535, Japan
| | - Tomoko Kawai
- Department of Maternal-Fetal Biology, National Research Institute for Child Health and Development, Tokyo 157-8535, Japan
| | - Kenichiro Hata
- Department of Maternal-Fetal Biology, National Research Institute for Child Health and Development, Tokyo 157-8535, Japan
| | - Kazuhiko Nakabayashi
- Department of Maternal-Fetal Biology, National Research Institute for Child Health and Development, Tokyo 157-8535, Japan
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Drake KA, Torgerson DG, Gignoux CR, Galanter JM, Roth LA, Huntsman S, Eng C, Oh SS, Yee SW, Lin L, Bustamante CD, Moreno-Estrada A, Sandoval K, Davis A, Borrell LN, Farber HJ, Kumar R, Avila PC, Brigino-Buenaventura E, Chapela R, Ford JG, Lenoir MA, Lurmann F, Meade K, Serebrisky D, Thyne S, Rodríguez-Cintrón W, Sen S, Rodríguez-Santana JR, Hernandez RD, Giacomini KM, Burchard EG. A genome-wide association study of bronchodilator response in Latinos implicates rare variants. J Allergy Clin Immunol 2014; 133:370-8. [PMID: 23992748 PMCID: PMC3938989 DOI: 10.1016/j.jaci.2013.06.043] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2013] [Revised: 05/09/2013] [Accepted: 06/18/2013] [Indexed: 01/29/2023]
Abstract
BACKGROUND The primary rescue medication to treat acute asthma exacerbation is the short-acting β₂-adrenergic receptor agonist; however, there is variation in how well a patient responds to treatment. Although these differences might be due to environmental factors, there is mounting evidence for a genetic contribution to variability in bronchodilator response (BDR). OBJECTIVE To identify genetic variation associated with bronchodilator drug response in Latino children with asthma. METHODS We performed a genome-wide association study (GWAS) for BDR in 1782 Latino children with asthma using standard linear regression, adjusting for genetic ancestry and ethnicity, and performed replication studies in an additional 531 Latinos. We also performed admixture mapping across the genome by testing for an association between local European, African, and Native American ancestry and BDR, adjusting for genomic ancestry and ethnicity. RESULTS We identified 7 genetic variants associated with BDR at a genome-wide significant threshold (P < 5 × 10(-8)), all of which had frequencies of less than 5%. Furthermore, we observed an excess of small P values driven by rare variants (frequency, <5%) and by variants in the proximity of solute carrier (SLC) genes. Admixture mapping identified 5 significant peaks; fine mapping within these peaks identified 2 rare variants in SLC22A15 as being associated with increased BDR in Mexicans. Quantitative PCR and immunohistochemistry identified SLC22A15 as being expressed in the lung and bronchial epithelial cells. CONCLUSION Our results suggest that rare variation contributes to individual differences in response to albuterol in Latinos, notably in SLC genes that include membrane transport proteins involved in the transport of endogenous metabolites and xenobiotics. Resequencing in larger, multiethnic population samples and additional functional studies are required to further understand the role of rare variation in BDR.
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Affiliation(s)
- Katherine A Drake
- Department of Medicine, University of California, San Francisco, Calif
| | - Dara G Torgerson
- Department of Medicine, University of California, San Francisco, Calif.
| | | | - Joshua M Galanter
- Department of Medicine, University of California, San Francisco, Calif
| | - Lindsey A Roth
- Department of Medicine, University of California, San Francisco, Calif
| | - Scott Huntsman
- Department of Medicine, University of California, San Francisco, Calif
| | - Celeste Eng
- Department of Medicine, University of California, San Francisco, Calif
| | - Sam S Oh
- Department of Medicine, University of California, San Francisco, Calif
| | - Sook Wah Yee
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, Calif
| | - Lawrence Lin
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, Calif
| | | | | | - Karla Sandoval
- Department of Genetics, Stanford University, Stanford, Calif
| | - Adam Davis
- Children's Hospital and Research Center Oakland, Oakland, Calif
| | - Luisa N Borrell
- Department of Health Sciences, Graduate Program in Public Health, Lehman College, City University of New York, Bronx, New York
| | - Harold J Farber
- Department of Pediatrics, Section of Pulmonology, Baylor College of Medicine and Texas Children's Hospital, Houston, Tex
| | - Rajesh Kumar
- Children's Memorial Hospital, and the Feinberg School of Medicine, Northwestern University, Chicago, Ill
| | - Pedro C Avila
- Division of Allergy-Immunology, Feinberg School of Medicine, Northwestern University, Chicago, Ill
| | | | - Rocio Chapela
- Instituto Nacional de Enfermedades Respiratorias (INER), Mexico City, Mexico
| | - Jean G Ford
- Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Md
| | | | | | - Kelley Meade
- Children's Hospital and Research Center Oakland, Oakland, Calif
| | - Denise Serebrisky
- Pediatric Pulmonary Division, Jacobi Medical Center, Bronx, New York
| | - Shannon Thyne
- Department of Pediatrics, University of California, San Francisco, Calif
| | | | - Saunak Sen
- Department of Biostatistics, University of California, San Francisco, Calif
| | | | - Ryan D Hernandez
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, Calif
| | - Kathleen M Giacomini
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, Calif
| | - Esteban G Burchard
- Department of Medicine, University of California, San Francisco, Calif; Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, Calif
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Li L, Gao K, Zhao J, Feng T, Yin L, Wang J, Wang C, Li C, Wang Y, Wang Q, Zhai Y, You H, Ren Y, Wang B, Hu D. Glucagon gene polymorphism modifies the effects of smoking and physical activity on risk of type 2 diabetes mellitus in Han Chinese. Gene 2013; 534:352-5. [PMID: 24185078 DOI: 10.1016/j.gene.2013.09.121] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2013] [Revised: 08/30/2013] [Accepted: 09/30/2013] [Indexed: 12/17/2022]
Abstract
Few genome-wide association studies have considered interactions between multiple genetic variants and environmental factors associated with disease. The interaction was examined between a glucagon gene (GCG) polymorphism and smoking, alcohol consumption and physical activity and the association with risk of type 2 diabetes mellitus (T2DM) in a case-control study of Chinese Han subjects. The rs12104705 polymorphism of GCG and interactions with environmental variables were analyzed for 9619 participants by binary multiple logistic regression. Smoking with the C-C haplotype of rs12104705 was associated with increased risk of T2DM (OR=1.174, 95% CI=1.013-1.361). Moderate and high physical activity with the C-C genotype was associated with decreased risk of T2DM as compared with low physical activity with the genotype (OR=0.251, 95% CI=0.206-0.306 and OR=0.190, 95% CI=0.164-0.220). However, the interaction of drinking and genotype was not associated with risk of T2DM. Genetic polymorphism in rs12104705 of GCG may interact with smoking and physical activity to modify the risk of T2DM.
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Affiliation(s)
- Linlin Li
- Department of Biostatistics, College of Public Health, Zhengzhou University, Zhengzhou, 450001, People's Republic of China
| | - Kaiping Gao
- Shenzhen University School of Medicine, Shenzhen, 518060, People's Republic of China
| | - Jingzhi Zhao
- Military Hospital of Henan Province, Zhengzhou, 450003, People's Republic of China
| | - Tianping Feng
- Military Hospital of Henan Province, Zhengzhou, 450003, People's Republic of China
| | - Lei Yin
- Military Hospital of Henan Province, Zhengzhou, 450003, People's Republic of China
| | - Jinjin Wang
- Discipline of Public Health and Preventive Medicine, Center of Preventive Medicine Research and Assessment, Henan University of Traditional Chinese Medicine, Zhengzhou, 450008, People's Republic of China
| | - Chongjian Wang
- Department of Biostatistics, College of Public Health, Zhengzhou University, Zhengzhou, 450001, People's Republic of China
| | - Chunyang Li
- Department of Biostatistics, College of Public Health, Zhengzhou University, Zhengzhou, 450001, People's Republic of China
| | - Yan Wang
- Department of Biostatistics, College of Public Health, Zhengzhou University, Zhengzhou, 450001, People's Republic of China
| | - Qian Wang
- Department of Biostatistics, College of Public Health, Zhengzhou University, Zhengzhou, 450001, People's Republic of China
| | - Yujia Zhai
- Department of Biostatistics, College of Public Health, Zhengzhou University, Zhengzhou, 450001, People's Republic of China
| | - Haifei You
- Department of Biostatistics, College of Public Health, Zhengzhou University, Zhengzhou, 450001, People's Republic of China
| | - Yongcheng Ren
- Department of Biostatistics, College of Public Health, Zhengzhou University, Zhengzhou, 450001, People's Republic of China
| | - Bingyuan Wang
- Department of Biostatistics, College of Public Health, Zhengzhou University, Zhengzhou, 450001, People's Republic of China
| | - Dongsheng Hu
- Shenzhen University School of Medicine, Shenzhen, 518060, People's Republic of China.
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14
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Leung TF, Ko FWS, Sy HY, Tsui SKW, Wong GWK. Differences in asthma genetics between Chinese and other populations. J Allergy Clin Immunol 2013; 133:42-8. [PMID: 24188974 DOI: 10.1016/j.jaci.2013.09.018] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Revised: 09/17/2013] [Accepted: 09/18/2013] [Indexed: 01/14/2023]
Abstract
Asthma is caused by complex gene-gene and gene-environment interactions. Most asthma genes are not replicable across populations, which is possibly because of differences in the epidemiology of these genes. Our case-control association and next-generation sequencing studies revealed substantial discrepancies in the frequencies of single nucleotide polymorphisms (SNPs) and haplotype blocks for asthma genes between Chinese and other populations. The minor allele frequencies for nearly half of our studied SNPs differed by 0.2 or greater between southern Chinese subjects in Hong Kong and European white populations, African populations, or both. Because genome-wide association studies for asthma have not been performed in Chinese subjects, we cannot tell whether the genomic findings of recent consortium-based genome-wide association studies are applicable to our population. In addition, our group performed Roche 454 pyrosequencing on a 100-kb area spanning each of 10 asthma loci in 24 healthy Hong Kong children. For the 17q21 locus, there was substantial variation in the haplotype structures that were constructed from 224 common SNPs among Hong Kong subjects and 6 ethnic groups under the 1000 Genomes Project. Sixteen mostly small haplotype blocks were formed in Hong Kong, whereas 6 haplotype blocks were identified in Han Chinese in Beijing and central European subjects and 11 and 19 blocks were identified in Puerto Rican and Yoruba African subjects. In conclusion, differences in allele frequencies of asthma genes and haplotype structures of asthma loci are found between Chinese subjects and other ethnic groups. These sequence variations must be considered during the selection of tagging SNPs for replicating genetic associations between populations.
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Affiliation(s)
- Ting F Leung
- Department of Pediatrics, Chinese University of Hong Kong, Hong Kong, China
| | - Fanny W S Ko
- Department of Medicine and Therapeutics, Chinese University of Hong Kong, Hong Kong, China
| | - Hing Y Sy
- Department of Pediatrics, Chinese University of Hong Kong, Hong Kong, China
| | - Stephen K W Tsui
- School of Biomedical Sciences, Chinese University of Hong Kong, Hong Kong, China
| | - Gary W K Wong
- Department of Pediatrics, Chinese University of Hong Kong, Hong Kong, China.
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15
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Cui XB, Chen YZ, Pang XL, Liu W, Hu JM, Li SG, Yang L, Zhang WJ, Liu CX, Cao YW, Jiang JF, Gu WY, Pang J, Yang L, Yuan XL, Yu SY, Li F. Multiple polymorphisms within the PLCE1 are associated with esophageal cancer via promoting the gene expression in a Chinese Kazakh population. Gene 2013; 530:315-22. [PMID: 23981775 DOI: 10.1016/j.gene.2013.08.057] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2013] [Revised: 07/26/2013] [Accepted: 08/16/2013] [Indexed: 01/16/2023]
Abstract
Although recent genome-wide association studies of esophageal squamous cell carcinoma (ESCC) identified a susceptibility locus in phospholipase C epsilon 1 (PLCE1) in Chinese Han populations, few studies further confirmed these findings in pure Kazakh population in which there are higher incidence and mortality of ESCC. Here, we investigated the potential associations between 19 SNPs of PLCE1 and susceptibility to ESCC in 222 cases and 326 controls from a pure ethnic population of Kazakh. Real-time PCR and immunohistochemistry were performed to detect the PLCE1 expression levels and evaluate their association with PLCE1 polymorphism. We found that only 4 SNPs (rs753724, rs11187842, rs2274223, and rs12263737) with moderate linkage disequilibrium (LD) confer significantly increased risk of ESCC, with the ORs ranging from 1.43 to 2.04, and there was a risk allele dose-dependent increase in ESCC risk (P-trend=0.043). Especially, the risk effects of rs2274223 were more evident in poor differentiation and advanced clinical stages of Kazakh ESCC. Additionally, the significantly lowest PLCE1 mRNA expression was found in the KYSE-150 cell line having no risk alleles compared with other three cell lines having risk alleles, and the normal tissues of both homozygous mutant type of PLCE1 rs12263737 and rs2274223 had a higher PLCE1 staining score than that of homozygous wild type. Our findings suggested that genetic variants in PLCE1 might serve as candidate markers for Kazakh ESCC susceptibility, and these LD variants might influence ESCC risk individually and jointly by promoting the messenger RNA and protein expression of the gene.
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Affiliation(s)
- Xiao-Bin Cui
- Department of Oncology, Tongji Hospital, Huazhong University of Science and Technology, Wuhan 430030, China; Department of Pathology and Key Laboratory for Xinjiang Endemic and Ethnic Diseases, Shihezi University School of Medicine, Shihezi 832002, China
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16
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Abhimanyu, Bose M, Komal, Varma-Basil M. Lack of association between IL17A and IL17F polymorphisms and related serum levels in north Indians with tuberculosis. Gene 2013; 529:195-8. [PMID: 23876429 DOI: 10.1016/j.gene.2013.06.090] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2013] [Revised: 06/12/2013] [Accepted: 06/29/2013] [Indexed: 11/16/2022]
Affiliation(s)
- Abhimanyu
- Department of Microbiology, Vallabhbhai Patel Chest Institute, University of Delhi, New Delhi 110007, India
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