1
|
Şentürk G, Ng YY, Eltan SB, Başer D, Ogulur I, Altındirek D, Fırtına S, Yılmaz H, Kocamış B, Kıykım A, Camcıoğlu Y, Ar MC, Sudutan T, Beken S, Temel ŞG, Alanay Y, Karakoc-Aydiner E, Barış S, Özen A, Özbek U, Sayitoğlu M, Hatırnaz Ng Ö. Determining T and B Cell development by TREC/KREC analysis in primary immunodeficiency patients and healthy controls. Scand J Immunol 2021; 95:e13130. [PMID: 34951041 DOI: 10.1111/sji.13130] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 07/30/2021] [Revised: 12/07/2021] [Accepted: 12/15/2021] [Indexed: 01/26/2023]
Abstract
T cell receptor excision circles (TRECs) and kappa-deleting excision circles (KRECs) are DNA fragments potentially indicative of T and B cell development, respectively. Recent thymic emigrants (RTEs) are a subset of peripheral cells that may also represent thymic function. Here, we investigated TREC/KREC copy numbers by quantitative real-time PCR in the peripheral blood of patients with primary immunodeficiencies (PIDs, n = 145) and that of healthy controls (HCs, n = 86) and assessed the correlation between RTEs and TREC copy numbers. We found that TREC copy numbers were significantly lower in children and adults with PIDs (P < .0001 and P < .002, respectively) as compared with their respective age-matched HCs. A moderate correlation was observed between TREC copies and RTE numbers among children with PID (r = .5114, P < .01), whereas no significant correlation was detected between RTE values and TREC content in the HCs (r = .0205, P = .9208). Additionally, we determined TREC and KREC copy numbers in DNA isolated from the Guthrie cards of 200 newborns and showed that this method is applicable to DNA isolated from both peripheral blood samples and dried blood spots, with the two sample types showing comparable TREC and KREC values. We further showed that RTE values are not always reliable markers of T cell output. Although additional confirmatory studies with larger cohorts are needed, our results provide thresholds for TREC/KREC copy numbers for different age groups.
Collapse
Affiliation(s)
- Gizem Şentürk
- Department of Genetics, Health Sciences Institute, Istanbul University, Istanbul, Turkey.,Department of Medical Biology, School of Medicine, Acıbadem Mehmet Ali Aydınlar University, Istanbul, Turkey.,Department of Genetics, Aziz Sancar Institute of Experimental Medicine, Istanbul University, Istanbul, Turkey
| | - Yuk Yin Ng
- Department of Genetics and Bioengineering, Istanbul Bilgi University, Istanbul, Turkey
| | - Sevgi Bilgiç Eltan
- The Isıl Berat Barlan Center for Translational Medicine, Istanbul, Turkey.,Division of Pediatric Allergy and Immunology, Pendik Research and Training Hospital, Marmara University, Istanbul, Turkey
| | - Dilek Başer
- The Isıl Berat Barlan Center for Translational Medicine, Istanbul, Turkey.,Division of Pediatric Allergy and Immunology, Pendik Research and Training Hospital, Marmara University, Istanbul, Turkey
| | - Ismail Ogulur
- The Isıl Berat Barlan Center for Translational Medicine, Istanbul, Turkey.,Division of Pediatric Allergy and Immunology, Marmara University School of Medicine, Istanbul, Turkey
| | - Didem Altındirek
- Department of Genetics, Aziz Sancar Institute of Experimental Medicine, Istanbul University, Istanbul, Turkey
| | - Sinem Fırtına
- Department of Bioinformatics and Genetics, Faculty of Engineering and Natural Science, Istanbul Istinye University, Istanbul, Turkey
| | - Hülya Yılmaz
- Division of Hematology, Ankara Medical Faculty, Ankara University, Ankara, Turkey
| | - Burcu Kocamış
- The Isıl Berat Barlan Center for Translational Medicine, Istanbul, Turkey.,Division of Pediatric Allergy and Immunology, Marmara University School of Medicine, Istanbul, Turkey
| | - Ayça Kıykım
- Division of Allergy, and Immunology, Department of Children's Health and Disease, Cerrahpasa Medical Faculty, Istanbul University-Cerrahpasa, Istanbul, Turkey
| | - Yıldız Camcıoğlu
- Division of Allergy, and Immunology, Department of Children's Health and Disease, Cerrahpasa Medical Faculty, Istanbul University-Cerrahpasa, Istanbul, Turkey
| | - Muhlis Cem Ar
- Division of Hematology, Department of Internal Medicine, Cerrahpasa Medical Faculty, Istanbul University-Cerrahpasa, Istanbul, Turkey
| | - Tuğçe Sudutan
- Department of Genetics, Aziz Sancar Institute of Experimental Medicine, Istanbul University, Istanbul, Turkey
| | - Serdar Beken
- Department of Pediatrics, School of Medicine, Acıbadem Mehmet Ali Aydınlar University, Istanbul, Turkey
| | - Şehime G Temel
- Department of Medical Genetics, Faculty of Medicine, Bursa Uludag University, Bursa, Turkey.,Department of Histology and Embryology, Faculty of Medicine, Bursa Uludag University, Bursa, Turkey.,Department of Translational Medicine, Institute of Health Sciences, Bursa Uludag University, Bursa, Turkey
| | - Yasemin Alanay
- Department of Pediatrics, School of Medicine, Acıbadem Mehmet Ali Aydınlar University, Istanbul, Turkey.,Rare Diseases and Orphan Drugs Application and Research Center, Acıbadem University, Istanbul, Turkey
| | - Elif Karakoc-Aydiner
- The Isıl Berat Barlan Center for Translational Medicine, Istanbul, Turkey.,Division of Pediatric Allergy and Immunology, Marmara University School of Medicine, Istanbul, Turkey
| | - Safa Barış
- The Isıl Berat Barlan Center for Translational Medicine, Istanbul, Turkey.,Division of Pediatric Allergy and Immunology, Marmara University School of Medicine, Istanbul, Turkey
| | - Ahmet Özen
- The Isıl Berat Barlan Center for Translational Medicine, Istanbul, Turkey.,Division of Pediatric Allergy and Immunology, Marmara University School of Medicine, Istanbul, Turkey
| | - Uğur Özbek
- Rare Diseases and Orphan Drugs Application and Research Center, Acıbadem University, Istanbul, Turkey.,Department of Medical Genetics, School of Medicine, Acıbadem Mehmet Ali Aydınlar University, Istanbul, Turkey
| | - Müge Sayitoğlu
- Department of Genetics, Aziz Sancar Institute of Experimental Medicine, Istanbul University, Istanbul, Turkey
| | - Özden Hatırnaz Ng
- Department of Medical Biology, School of Medicine, Acıbadem Mehmet Ali Aydınlar University, Istanbul, Turkey.,Department of Genetics, Aziz Sancar Institute of Experimental Medicine, Istanbul University, Istanbul, Turkey.,Rare Diseases and Orphan Drugs Application and Research Center, Acıbadem University, Istanbul, Turkey
| |
Collapse
|
3
|
Küçükosmanoğlu E, Özen E, Eltan SB, Özkars MY, Keskin Ö. Most children who are allergic to cow's milk tolerate yogurt. J Int Med Res 2018; 46:5099-5106. [PMID: 30092694 PMCID: PMC6300965 DOI: 10.1177/0300060518790430] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Accepted: 07/02/2018] [Indexed: 01/01/2023] Open
Abstract
OBJECTIVE Cow's milk allergy is the most common food allergy in childhood. Changes occur in the protein structure of milk during yogurt fermentation. This study aimed to determine whether children who are diagnosed with a cow's milk allergy can tolerate yogurt. METHODS We performed a yogurt challenge test on 34 children who were diagnosed with a cow's milk allergy in our Pediatric Allergy Outpatient Clinic. The mean age of 24 male and 10 female children was 24 ± 13 months. RESULTS A reaction was observed in 17 (50%) patients, whereas no reaction was observed in the other 17 (50%) during an oral yogurt challenge test that was performed in all of the 34 patients with a cow's milk allergy. Cow's milk-specific immunoglobulin E levels were significantly lower in the group of children who could tolerate yogurt than in the group of children who could not tolerate yogurt. CONCLUSION Yogurt is tolerated by half of children with a cow's milk allergy when subjected to a challenge test performed with yogurt, which is consumed as much as milk in Turkey.
Collapse
Affiliation(s)
- Ercan Küçükosmanoğlu
- Department of Pediatric Allergy, Gaziantep University Medical Faculty, Gaziantep, Turkey
| | - Evrim Özen
- Department of Pediatrics, Gaziantep University Medical Faculty, Gaziantep, Turkey
| | - Sevgi Bilgiç Eltan
- Department of Pediatric Allergy, Gaziantep University Medical Faculty, Gaziantep, Turkey
| | - Mehmet Yaşar Özkars
- Department of Pediatric Allergy, Sütçü İmam University, Medical Faculty, Kahramanmaraş, Turkey
| | - Özlem Keskin
- Department of Pediatric Allergy, Gaziantep University Medical Faculty, Gaziantep, Turkey
| |
Collapse
|