Frequency of HLA‐DQ, susceptibility genotypes for celiac disease, in Brazilian newborns

Background The frequency of HLA‐DQ2 and DQ8 predisposing genotypes for celiac disease (CD) has shown significant variation among different world regions and has not been previously determined among the highly interbred Brazilian population. The aim of this study was to investigate the frequency of t...

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Published in:Molecular genetics & genomic medicine Vol. 6; no. 5; pp. 779 - 784
Main Authors: Almeida, Fernanda C., Gandolfi, Lenora, Costa, Karina N., Picanço, Marilucia R. A., Almeida, Lucas M., Nóbrega, Yanna K. M., Pratesi, Riccardo, Pratesi, Claudia B., Selleski, Nicole
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Published: United States John Wiley & Sons, Inc 01-09-2018
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Abstract Background The frequency of HLA‐DQ2 and DQ8 predisposing genotypes for celiac disease (CD) has shown significant variation among different world regions and has not been previously determined among the highly interbred Brazilian population. The aim of this study was to investigate the frequency of these genotypes among Brazilian newborns (NB). Methods We typed DQA1*05 ‐ DQB1*02 (DQ2.5) and DQA1*03 ‐ DQB1*03:02 (DQ8) alleles in 329 NB using qPCR technique. Subsequently we confirmed our results by PCR‐SSP using a reference kit which further identified DQ2.2 (DQA1*02:01 ‐ DQB1*02). Results Among the 329 NB, using qPCR technique: 5 (1.52%) carried both DQ2.5 and DQ8 variants; 58 (17.63%) carried only DQ2.5 (DQA1*05 and DQB1*02) and 47 (14.29%) carried only the DQ8 (DQA1*03 and DQB1*03:02) variant. The use of the PCR‐SSP method yielded further information; among the 329 samples: 34 (10.34%) tested positive for DQ2.2 and among the 47 previously DQ8 positives samples, we found 10 (3.04%) that also tested positives for DQ2.2. Conclusion 43.7% of the analyzed individual tested positive for at least one of the CD predisposing HLA‐DQ genotypes in our group of Brazilian NB. The highest frequency was found for DQ2.5 positive subjects (17.6%) followed by DQ8 (11.3%); DQ2.2 (10.3%); DQ8 and DQ2.2 (3.0%); DQ2.5 and DQ8 (1.5%). We found no positive sample for DQ2.5 associated with DQ2.2. This study analyses the frequency of celiac disease predisposing variants in a highly interbreed population (the Brazilian population). We assessed this information by studying a representative sample of the country and using a faster and more specific approach developed by our research team and previously validated.
AbstractList BackgroundThe frequency of HLA‐DQ2 and DQ8 predisposing genotypes for celiac disease (CD) has shown significant variation among different world regions and has not been previously determined among the highly interbred Brazilian population. The aim of this study was to investigate the frequency of these genotypes among Brazilian newborns (NB).MethodsWe typed DQA1*05 ‐ DQB1*02 (DQ2.5) and DQA1*03 ‐ DQB1*03:02 (DQ8) alleles in 329 NB using qPCR technique. Subsequently we confirmed our results by PCR‐SSP using a reference kit which further identified DQ2.2 (DQA1*02:01 ‐ DQB1*02).ResultsAmong the 329 NB, using qPCR technique: 5 (1.52%) carried both DQ2.5 and DQ8 variants; 58 (17.63%) carried only DQ2.5 (DQA1*05 and DQB1*02) and 47 (14.29%) carried only the DQ8 (DQA1*03 and DQB1*03:02) variant. The use of the PCR‐SSP method yielded further information; among the 329 samples: 34 (10.34%) tested positive for DQ2.2 and among the 47 previously DQ8 positives samples, we found 10 (3.04%) that also tested positives for DQ2.2.Conclusion43.7% of the analyzed individual tested positive for at least one of the CD predisposing HLA‐DQ genotypes in our group of Brazilian NB. The highest frequency was found for DQ2.5 positive subjects (17.6%) followed by DQ8 (11.3%); DQ2.2 (10.3%); DQ8 and DQ2.2 (3.0%); DQ2.5 and DQ8 (1.5%). We found no positive sample for DQ2.5 associated with DQ2.2.
Background The frequency of HLA‐DQ2 and DQ8 predisposing genotypes for celiac disease (CD) has shown significant variation among different world regions and has not been previously determined among the highly interbred Brazilian population. The aim of this study was to investigate the frequency of these genotypes among Brazilian newborns (NB). Methods We typed DQA1*05 ‐ DQB1*02 (DQ2.5) and DQA1*03 ‐ DQB1*03:02 (DQ8) alleles in 329 NB using qPCR technique. Subsequently we confirmed our results by PCR‐SSP using a reference kit which further identified DQ2.2 (DQA1*02:01 ‐ DQB1*02). Results Among the 329 NB, using qPCR technique: 5 (1.52%) carried both DQ2.5 and DQ8 variants; 58 (17.63%) carried only DQ2.5 (DQA1*05 and DQB1*02) and 47 (14.29%) carried only the DQ8 (DQA1*03 and DQB1*03:02) variant. The use of the PCR‐SSP method yielded further information; among the 329 samples: 34 (10.34%) tested positive for DQ2.2 and among the 47 previously DQ8 positives samples, we found 10 (3.04%) that also tested positives for DQ2.2. Conclusion 43.7% of the analyzed individual tested positive for at least one of the CD predisposing HLA‐DQ genotypes in our group of Brazilian NB. The highest frequency was found for DQ2.5 positive subjects (17.6%) followed by DQ8 (11.3%); DQ2.2 (10.3%); DQ8 and DQ2.2 (3.0%); DQ2.5 and DQ8 (1.5%). We found no positive sample for DQ2.5 associated with DQ2.2. This study analyses the frequency of celiac disease predisposing variants in a highly interbreed population (the Brazilian population). We assessed this information by studying a representative sample of the country and using a faster and more specific approach developed by our research team and previously validated.
The frequency of HLA-DQ2 and DQ8 predisposing genotypes for celiac disease (CD) has shown significant variation among different world regions and has not been previously determined among the highly interbred Brazilian population. The aim of this study was to investigate the frequency of these genotypes among Brazilian newborns (NB). We typed DQA1*05 - DQB1*02 (DQ2.5) and DQA1*03 - DQB1*03:02 (DQ8) alleles in 329 NB using qPCR technique. Subsequently we confirmed our results by PCR-SSP using a reference kit which further identified DQ2.2 (DQA1*02:01 - DQB1*02). Among the 329 NB, using qPCR technique: 5 (1.52%) carried both DQ2.5 and DQ8 variants; 58 (17.63%) carried only DQ2.5 (DQA1*05 and DQB1*02) and 47 (14.29%) carried only the DQ8 (DQA1*03 and DQB1*03:02) variant. The use of the PCR-SSP method yielded further information; among the 329 samples: 34 (10.34%) tested positive for DQ2.2 and among the 47 previously DQ8 positives samples, we found 10 (3.04%) that also tested positives for DQ2.2. 43.7% of the analyzed individual tested positive for at least one of the CD predisposing HLA-DQ genotypes in our group of Brazilian NB. The highest frequency was found for DQ2.5 positive subjects (17.6%) followed by DQ8 (11.3%); DQ2.2 (10.3%); DQ8 and DQ2.2 (3.0%); DQ2.5 and DQ8 (1.5%). We found no positive sample for DQ2.5 associated with DQ2.2.
Author Almeida, Lucas M.
Costa, Karina N.
Picanço, Marilucia R. A.
Nóbrega, Yanna K. M.
Pratesi, Claudia B.
Gandolfi, Lenora
Selleski, Nicole
Pratesi, Riccardo
Almeida, Fernanda C.
AuthorAffiliation 2 Research Center for Celiac Disease School of Medicine University of Brasilia Brasilia DF Brazil
4 Department of Pediatrics School of Medicine University of Brasilia Brasilia DF Brazil
1 Graduate Program in Medical Sciences School of Medicine University of Brasilia Brasilia DF Brazil
3 Graduate Program in Health Sciences School of Health Sciences University of Brasilia Brasilia DF Brazil
5 Department of Pharmaceutical Sciences School of Health Sciences University of Brasilia Brasilia DF Brazil
AuthorAffiliation_xml – name: 1 Graduate Program in Medical Sciences School of Medicine University of Brasilia Brasilia DF Brazil
– name: 2 Research Center for Celiac Disease School of Medicine University of Brasilia Brasilia DF Brazil
– name: 5 Department of Pharmaceutical Sciences School of Health Sciences University of Brasilia Brasilia DF Brazil
– name: 4 Department of Pediatrics School of Medicine University of Brasilia Brasilia DF Brazil
– name: 3 Graduate Program in Health Sciences School of Health Sciences University of Brasilia Brasilia DF Brazil
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  fullname: Costa, Karina N.
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  surname: Selleski
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  email: selleskinicole@gmail.com
  organization: University of Brasilia
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crossref_primary_10_1111_tan_14119
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Issue 5
Keywords celiac disease
HLA-DQ8
newborn
polymerase chain reaction
HLA-DQ2
frequency
Language English
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This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
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Snippet Background The frequency of HLA‐DQ2 and DQ8 predisposing genotypes for celiac disease (CD) has shown significant variation among different world regions and...
The frequency of HLA-DQ2 and DQ8 predisposing genotypes for celiac disease (CD) has shown significant variation among different world regions and has not been...
BackgroundThe frequency of HLA‐DQ2 and DQ8 predisposing genotypes for celiac disease (CD) has shown significant variation among different world regions and has...
BACKGROUNDThe frequency of HLA-DQ2 and DQ8 predisposing genotypes for celiac disease (CD) has shown significant variation among different world regions and has...
SourceID pubmedcentral
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pubmed
wiley
SourceType Open Access Repository
Aggregation Database
Index Database
Publisher
StartPage 779
SubjectTerms Alleles
Autoimmune diseases
Brazil - epidemiology
Celiac disease
Celiac Disease - epidemiology
Celiac Disease - genetics
DQA1 protein
Female
frequency
Gene Frequency
Genetic Predisposition to Disease
Genotypes
Histocompatibility antigen HLA
HLA-DQ Antigens - genetics
HLA‐DQ2
HLA‐DQ8
Humans
Infant, Newborn
Male
Neonates
newborn
Original
polymerase chain reaction
Real-Time Polymerase Chain Reaction
Title Frequency of HLA‐DQ, susceptibility genotypes for celiac disease, in Brazilian newborns
URI https://onlinelibrary.wiley.com/doi/abs/10.1002%2Fmgg3.444
https://www.ncbi.nlm.nih.gov/pubmed/30014583
https://www.proquest.com/docview/2113070945
https://search.proquest.com/docview/2071570690
https://pubmed.ncbi.nlm.nih.gov/PMC6160714
Volume 6
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