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Silao CLT, Latiff ZA, Kountouris P, Zilfalil BA. Editorial: Insights in thalassemia: from genomics to clinical practice. Front Pediatr 2023; 11:1222946. [PMID: 37520048 PMCID: PMC10381938 DOI: 10.3389/fped.2023.1222946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Accepted: 06/27/2023] [Indexed: 08/01/2023] Open
Affiliation(s)
- Catherine Lynn T. Silao
- Institute of Human Genetics, National Institutes of Health, Manila, Philippines
- Department of Pediatrics, College of Medicine and Philippine General Hospital, University of the Philippines Manila, Manila, Philippines
| | - Zarina Abdul Latiff
- Department of Paediatrics, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Kuala Lumpur, Malaysia
| | - Petros Kountouris
- Molecular Genetics Thalassaemia Department, The Cyprus Institute of Neurology and Genetics, Nicosia, Cyprus
| | - Bin Alwi Zilfalil
- Human Genome Centre, School of Medical Sciences, Universiti Sains Malaysia, Health Campus, Kelantan, Malaysia
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2
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Xenophontos M, Minaidou A, Stephanou C, Tamana S, Kleanthous M, Kountouris P. IthaPhen: An Interactive Database of Genotype-Phenotype Data for Hemoglobinopathies. Hemasphere 2023; 7:e922. [PMID: 37359188 PMCID: PMC10289560 DOI: 10.1097/hs9.0000000000000922] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Accepted: 05/31/2023] [Indexed: 06/28/2023] Open
Affiliation(s)
- Maria Xenophontos
- Molecular Genetics Thalassaemia Department, The Cyprus Institute of Neurology and Genetics, Nicosia, Cyprus
| | - Anna Minaidou
- Molecular Genetics Thalassaemia Department, The Cyprus Institute of Neurology and Genetics, Nicosia, Cyprus
| | - Coralea Stephanou
- Molecular Genetics Thalassaemia Department, The Cyprus Institute of Neurology and Genetics, Nicosia, Cyprus
| | - Stella Tamana
- Molecular Genetics Thalassaemia Department, The Cyprus Institute of Neurology and Genetics, Nicosia, Cyprus
| | - Marina Kleanthous
- Molecular Genetics Thalassaemia Department, The Cyprus Institute of Neurology and Genetics, Nicosia, Cyprus
| | - Petros Kountouris
- Molecular Genetics Thalassaemia Department, The Cyprus Institute of Neurology and Genetics, Nicosia, Cyprus
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3
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Kountouris P, Stephanou C, Lederer CW, Traeger‐Synodinos J, Bento C, Harteveld CL, Fylaktou E, Koopmann TT, Halim‐Fikri H, Michailidou K, Nfonsam LE, Waye JS, Zilfalil BA, Kleanthous M. Adapting the ACMG/AMP variant classification framework: A perspective from the ClinGen Hemoglobinopathy Variant Curation Expert Panel. Hum Mutat 2022; 43:1089-1096. [PMID: 34510646 PMCID: PMC9545675 DOI: 10.1002/humu.24280] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 08/10/2021] [Accepted: 09/08/2021] [Indexed: 12/29/2022]
Abstract
Accurate and consistent interpretation of sequence variants is integral to the delivery of safe and reliable diagnostic genetic services. To standardize the interpretation process, in 2015, the American College of Medical Genetics and Genomics (ACMG) and the Association for Molecular Pathology (AMP) published a joint guideline based on a set of shared standards for the classification of variants in Mendelian diseases. The generality of these standards and their subjective interpretation between laboratories has prompted efforts to reduce discordance of variant classifications, with a focus on the expert specification of the ACMG/AMP guidelines for individual genes or diseases. Herein, we describe our experience as a ClinGen Variant Curation Expert Panel to adapt the ACMG/AMP criteria for the classification of variants in three globin genes (HBB, HBA2, and HBA1) related to recessively inherited hemoglobinopathies, including five evidence categories, as use cases demonstrating the process of specification and the underlying rationale.
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Affiliation(s)
- Petros Kountouris
- Molecular Genetics Thalassaemia DepartmentThe Cyprus Institute of Neurology and GeneticsNicosiaCyprus,Cyprus School of Molecular MedicineNicosiaCyprus
| | - Coralea Stephanou
- Molecular Genetics Thalassaemia DepartmentThe Cyprus Institute of Neurology and GeneticsNicosiaCyprus
| | - Carsten W. Lederer
- Molecular Genetics Thalassaemia DepartmentThe Cyprus Institute of Neurology and GeneticsNicosiaCyprus,Cyprus School of Molecular MedicineNicosiaCyprus
| | - Joanne Traeger‐Synodinos
- Laboratory of Medical Genetics, St. Sophia's Children's HospitalNational and Kapodistrian University of AthensAthensGreece
| | - Celeste Bento
- Department of HaematologyCentro Hospitalar e Universitário de CoimbraCoimbraPortugal
| | - Cornelis L. Harteveld
- Department of Clinical Genetics/LDGALeiden University Medical CenterLeidenNetherlands
| | - Eirini Fylaktou
- Laboratory of Medical Genetics, St. Sophia's Children's HospitalNational and Kapodistrian University of AthensAthensGreece
| | - Tamara T. Koopmann
- Department of Clinical Genetics/LDGALeiden University Medical CenterLeidenNetherlands
| | | | - Kyriaki Michailidou
- Cyprus School of Molecular MedicineNicosiaCyprus,Biostatistics UnitThe Cyprus Institute of Neurology and GeneticsNicosiaCyprus
| | - Landry E. Nfonsam
- Hamilton Regional Laboratory Medicine ProgramHamilton Health SciencesHamiltonCanada,Department of Pathology and Molecular MedicineMcMaster UniversityHamiltonCanada
| | - John S. Waye
- Hamilton Regional Laboratory Medicine ProgramHamilton Health SciencesHamiltonCanada,Department of Pathology and Molecular MedicineMcMaster UniversityHamiltonCanada
| | | | - Marina Kleanthous
- Molecular Genetics Thalassaemia DepartmentThe Cyprus Institute of Neurology and GeneticsNicosiaCyprus,Cyprus School of Molecular MedicineNicosiaCyprus
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4
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Kingdom R, Wright CF. Incomplete Penetrance and Variable Expressivity: From Clinical Studies to Population Cohorts. Front Genet 2022; 13:920390. [PMID: 35983412 PMCID: PMC9380816 DOI: 10.3389/fgene.2022.920390] [Citation(s) in RCA: 66] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Accepted: 06/09/2022] [Indexed: 12/20/2022] Open
Abstract
The same genetic variant found in different individuals can cause a range of diverse phenotypes, from no discernible clinical phenotype to severe disease, even among related individuals. Such variants can be said to display incomplete penetrance, a binary phenomenon where the genotype either causes the expected clinical phenotype or it does not, or they can be said to display variable expressivity, in which the same genotype can cause a wide range of clinical symptoms across a spectrum. Both incomplete penetrance and variable expressivity are thought to be caused by a range of factors, including common variants, variants in regulatory regions, epigenetics, environmental factors, and lifestyle. Many thousands of genetic variants have been identified as the cause of monogenic disorders, mostly determined through small clinical studies, and thus, the penetrance and expressivity of these variants may be overestimated when compared to their effect on the general population. With the wealth of population cohort data currently available, the penetrance and expressivity of such genetic variants can be investigated across a much wider contingent, potentially helping to reclassify variants that were previously thought to be completely penetrant. Research into the penetrance and expressivity of such genetic variants is important for clinical classification, both for determining causative mechanisms of disease in the affected population and for providing accurate risk information through genetic counseling. A genotype-based definition of the causes of rare diseases incorporating information from population cohorts and clinical studies is critical for our understanding of incomplete penetrance and variable expressivity. This review examines our current knowledge of the penetrance and expressivity of genetic variants in rare disease and across populations, as well as looking into the potential causes of the variation seen, including genetic modifiers, mosaicism, and polygenic factors, among others. We also considered the challenges that come with investigating penetrance and expressivity.
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Affiliation(s)
| | - Caroline F. Wright
- Institute of Biomedical and Clinical Science, Royal Devon & Exeter Hospital, University of Exeter Medical School, Exeter, United Kingdom
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5
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Halim-Fikri BH, Lederer CW, Baig AA, Mat-Ghani SNA, Syed-Hassan SNRK, Yusof W, Abdul Rashid D, Azman NF, Fucharoen S, Panigoro R, Silao CLT, Viprakasit V, Jalil N, Mohd Yasin N, Bahar R, Selvaratnam V, Mohamad N, Nik Hassan NN, Esa E, Krause A, Robinson H, Hasler J, Stephanou C, Raja-Sabudin RZA, Elion J, El-Kamah G, Coviello D, Yusoff N, Abdul Latiff Z, Arnold C, Burn J, Kountouris P, Kleanthous M, Ramesar R, Zilfalil BA. Global Globin Network Consensus Paper: Classification and Stratified Roadmaps for Improved Thalassaemia Care and Prevention in 32 Countries. J Pers Med 2022; 12:jpm12040552. [PMID: 35455667 PMCID: PMC9032232 DOI: 10.3390/jpm12040552] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 03/06/2022] [Accepted: 03/23/2022] [Indexed: 11/16/2022] Open
Abstract
The Global Globin Network (GGN) is a project-wide initiative of the Human Variome/Global Variome Project (HVP) focusing on haemoglobinopathies to build the capacity for genomic diagnosis, clinical services, and research in low- and middle-income countries. At present, there is no framework to evaluate the improvement of care, treatment, and prevention of thalassaemia and other haemoglobinopathies globally, despite thalassaemia being one of the most common monogenic diseases worldwide. Here, we propose a universally applicable system for evaluating and grouping countries based on qualitative indicators according to the quality of care, treatment, and prevention of haemoglobinopathies. We also apply this system to GGN countries as proof of principle. To this end, qualitative indicators were extracted from the IthaMaps database of the ITHANET portal, which allowed four groups of countries (A, B, C, and D) to be defined based on major qualitative indicators, supported by minor qualitative indicators for countries with limited resource settings and by the overall haemoglobinopathy carrier frequency for the target countries of immigration. The proposed rubrics and accumulative scores will help analyse the performance and improvement of care, treatment, and prevention of haemoglobinopathies in the GGN and beyond. Our proposed criteria complement future data collection from GGN countries to help monitor the quality of services for haemoglobinopathies, provide ongoing estimates for services and epidemiology in GGN countries, and note the contribution of the GGN to a local and global reduction of disease burden.
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Affiliation(s)
- Bin Hashim Halim-Fikri
- Malaysian Node of the Human Variome Project Secretariat, School of Medical Sciences, Universiti Sains Malaysia, Health Campus, Kubang Kerian 16150, Kelantan, Malaysia; (B.H.H.-F.); (S.-N.R.-K.S.-H.); (W.Y.)
| | - Carsten W. Lederer
- Molecular Genetics Thalassaemia Department, The Cyprus Institute of Neurology & Genetics, 6 Iroon Avenue, Ayios Dometios, Nicosia 2371, Cyprus; (C.W.L.); (C.S.); (P.K.); (M.K.)
| | - Atif Amin Baig
- Faculty of Medicine, Universiti Sultan Zainal Abidin, Kuala Terengganu 20400, Terengganu, Malaysia;
| | - Siti Nor Assyuhada Mat-Ghani
- School of Health Sciences, Universiti Sains Malaysia, Health Campus, Kubang Kerian 16150, Kelantan, Malaysia; (S.N.A.M.-G.); (N.N.N.H.)
| | - Sharifah-Nany Rahayu-Karmilla Syed-Hassan
- Malaysian Node of the Human Variome Project Secretariat, School of Medical Sciences, Universiti Sains Malaysia, Health Campus, Kubang Kerian 16150, Kelantan, Malaysia; (B.H.H.-F.); (S.-N.R.-K.S.-H.); (W.Y.)
| | - Wardah Yusof
- Malaysian Node of the Human Variome Project Secretariat, School of Medical Sciences, Universiti Sains Malaysia, Health Campus, Kubang Kerian 16150, Kelantan, Malaysia; (B.H.H.-F.); (S.-N.R.-K.S.-H.); (W.Y.)
| | - Diana Abdul Rashid
- Department of Paediatrics, School of Medical Sciences, Universiti Sains Malaysia, Health Campus, Kubang Kerian 16150, Kelantan, Malaysia; (D.A.R.); (N.F.A.); (N.M.)
| | - Nurul Fatihah Azman
- Department of Paediatrics, School of Medical Sciences, Universiti Sains Malaysia, Health Campus, Kubang Kerian 16150, Kelantan, Malaysia; (D.A.R.); (N.F.A.); (N.M.)
| | - Suthat Fucharoen
- Thalassemia Research Centre, Institute of Molecular Biosciences, Mahidol University, Nakhom Pathom 73170, Thailand;
| | - Ramdan Panigoro
- Department of Biomedical Sciences, Medical Genetics Research Centre, Faculty of Medicine, Universitas Padjadjaran, Bandung 40161, Indonesia;
| | - Catherine Lynn T. Silao
- Institute of Human Genetics, National Institutes of Health, University of the Philippines, Manila 1000, Philippines;
- Department of Pediatrics, College of Medicine, University of the Philippines, Manila 1000, Philippines
| | - Vip Viprakasit
- Department of Paediatrics & Thalassaemia Centre, Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand;
| | - Norunaluwar Jalil
- UKM Specialist Children’s Hospital, Jalan Yaacob Latif, Bandar Tun Razak, Cheras 56000, Kuala Lumpur, Malaysia;
| | - Norafiza Mohd Yasin
- Haematology Unit, Cancer Research Centre, Institute for Medical Research, National Institutes of Health, No. 1, Jalan Setia Murni U13/52, Seksyen U13, Bandar Setia Alam, Shah Alam 40170, Selangor Darul Ehsan, Malaysia; (N.M.Y.); (E.E.)
| | - Rosnah Bahar
- Department of Haematology, School of Medical Sciences, Universiti Sains Malaysia, Health Campus, Kubang Kerian 16150, Kelantan, Malaysia;
| | - Veena Selvaratnam
- Hospital Ampang, Jalan Mewah Utara, Taman Pandan Mewah, Ampang Jaya 68000, Selangor, Malaysia;
| | - Norsarwany Mohamad
- Department of Paediatrics, School of Medical Sciences, Universiti Sains Malaysia, Health Campus, Kubang Kerian 16150, Kelantan, Malaysia; (D.A.R.); (N.F.A.); (N.M.)
| | - Nik Norliza Nik Hassan
- School of Health Sciences, Universiti Sains Malaysia, Health Campus, Kubang Kerian 16150, Kelantan, Malaysia; (S.N.A.M.-G.); (N.N.N.H.)
| | - Ezalia Esa
- Haematology Unit, Cancer Research Centre, Institute for Medical Research, National Institutes of Health, No. 1, Jalan Setia Murni U13/52, Seksyen U13, Bandar Setia Alam, Shah Alam 40170, Selangor Darul Ehsan, Malaysia; (N.M.Y.); (E.E.)
| | - Amanda Krause
- Division of Human Genetics, National Health Laboratory Service (NHLS) and School of Pathology, Faculty of Health Sciences, The University of the Witwatersrand, Watkins Pitchford Building, NHLS Braamfontein, Cnr Hospital and De Korte St, Hillbrow, P.O. Box 1038, Johannesburg 2000, South Africa;
| | - Helen Robinson
- Nossal Institute for Global Health, MDDHS, University of Melbourne, Melbourne, VIC 3010, Australia;
| | - Julia Hasler
- Global Variome, Institute of Genetic Medicine, International Centre for Life, Central Parkway, Newcastle upon Tyne NE1 3BZ, UK;
| | - Coralea Stephanou
- Molecular Genetics Thalassaemia Department, The Cyprus Institute of Neurology & Genetics, 6 Iroon Avenue, Ayios Dometios, Nicosia 2371, Cyprus; (C.W.L.); (C.S.); (P.K.); (M.K.)
| | - Raja-Zahratul-Azma Raja-Sabudin
- Department of Pathology, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Jalan Yaacob Latif, Bandar Tun Razak, Cheras 56000, Kuala Lumpur, Malaysia;
| | - Jacques Elion
- Medical School, Université Paris Diderot, 75018 Paris, France;
| | - Ghada El-Kamah
- Clinical Genetics Department, Human Genetics and Genome Research Institute, National Research Centre, Cairo 12622, Egypt;
| | - Domenico Coviello
- Laboratorio di Genetica Umana, IRCCS Istituto Giannina Gaslini, Largo Gerolamo Gaslini 5, 16147 Genova, Italy;
| | - Narazah Yusoff
- Advanced Medical and Dental Institute, Universiti Sains Malaysia, Bertam, Kepala Batas 13200, Pulau Pinang, Malaysia;
| | - Zarina Abdul Latiff
- Department of Paediatrics, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Cheras 56000, Kuala Lumpur, Malaysia;
| | - Chris Arnold
- BioGrid Australia, Hodgson Associates, 4 Hodgson St., Kew, Melbourne, VIC 3101, Australia;
| | - John Burn
- Translational and Clinical Research Institute, International Centre for Life Times Square, Newcastle upon Tyne NE1 3BZ, UK;
| | - Petros Kountouris
- Molecular Genetics Thalassaemia Department, The Cyprus Institute of Neurology & Genetics, 6 Iroon Avenue, Ayios Dometios, Nicosia 2371, Cyprus; (C.W.L.); (C.S.); (P.K.); (M.K.)
| | - Marina Kleanthous
- Molecular Genetics Thalassaemia Department, The Cyprus Institute of Neurology & Genetics, 6 Iroon Avenue, Ayios Dometios, Nicosia 2371, Cyprus; (C.W.L.); (C.S.); (P.K.); (M.K.)
| | - Raj Ramesar
- Department of Pathology, University of Cape Town City of Cape Town, Cape Town 7925, South Africa;
| | - Bin Alwi Zilfalil
- Human Genome Centre, School of Medical Sciences, Universiti Sains Malaysia, Health Campus, Kubang Kerian 16150, Kelantan, Malaysia
- Correspondence: or ; Tel.: +60-9767-6531
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6
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Kountouris P, Stephanou C, Archer N, Bonifazi F, Giannuzzi V, Kuo KHM, Maggio A, Makani J, Mañú-Pereira MDM, Michailidou K, Nkya S, Nnodu OE, Trompeter S, Tshilolo L, Wonkam A, Zilfalil BA, Inusa BPD, Kleanthous M. The International Hemoglobinopathy Research Network (INHERENT): An international initiative to study the role of genetic modifiers in hemoglobinopathies. Am J Hematol 2021; 96:E416-E420. [PMID: 34406671 PMCID: PMC10390849 DOI: 10.1002/ajh.26323] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Accepted: 08/02/2021] [Indexed: 01/09/2023]
Affiliation(s)
- Petros Kountouris
- The Cyprus Institute of Neurology and Genetics, Nicosia, Cyprus.,Cyprus School of Molecular Medicine, Nicosia, Cyprus
| | | | - Natasha Archer
- Pediatric Hematology/Oncology, Dana-Farber/Boston Children's Cancer and Blood Disorders Center, Boston, Massachusetts, USA
| | - Fedele Bonifazi
- Fondazione per la Ricerca Farmacologica Gianni Benzi Onlus, Bari, Italy
| | - Viviana Giannuzzi
- Fondazione per la Ricerca Farmacologica Gianni Benzi Onlus, Bari, Italy
| | - Kevin H M Kuo
- Division of Hematology, Department of Medicine, University of Toronto, Toronto, Ontario, Canada
| | | | - Julie Makani
- Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania
| | - María Del Mar Mañú-Pereira
- Translational Research in Child and Adolescent Cancer. Vall d'Hebron Institut de recerca, Barcelona, Spain
| | - Kyriaki Michailidou
- The Cyprus Institute of Neurology and Genetics, Nicosia, Cyprus.,Cyprus School of Molecular Medicine, Nicosia, Cyprus
| | - Siana Nkya
- Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania.,Dar es Salaam University College of Education, Dar es Salaam, Tanzania
| | - Obiageli E Nnodu
- Department of Haematology and Blood Transfusion, University of Abuja, Abuja, Nigeria
| | - Sara Trompeter
- University College London Hospitals NHS Trust, London, UK.,NHS Blood and Transplant, London, UK
| | - Léon Tshilolo
- Centre Hospitalier Monkole and CEFA-Institut de Recherche Biomédicale, Kinshasa, Democratic Republic of Congo
| | | | | | - Baba P D Inusa
- Paediatric Haematology, Evelina London Children's Hospital, Guy's & St. Thomas' Hospital NHS Foundation Trust, London, UK
| | - Marina Kleanthous
- The Cyprus Institute of Neurology and Genetics, Nicosia, Cyprus.,Cyprus School of Molecular Medicine, Nicosia, Cyprus
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7
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Kountouris P, Michailidou K, Christou S, Hadjigavriel M, Sitarou M, Kolnagou A, Kleanthous M, Telfer P. Effect of HBB genotype on survival in a cohort of transfusion-dependent thalassemia patients in Cyprus. Haematologica 2021; 106:2458-2468. [PMID: 32732363 PMCID: PMC8409026 DOI: 10.3324/haematol.2020.260224] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Indexed: 12/14/2022] Open
Abstract
Initiation of regular transfusion in transfusion-dependent thalassemia (TDT) is based on the assessment of clinical phenotype. Pathogenic HBB variants causing β-thalassemia are important determinants of phenotype and could be used to aid decision-making. We investigated the association of HBB genotype with survival in a cohort study in the four thalassemia centers in Cyprus. HBB genotype was classified as severe (β0/β0 or β+/β0), moderate (β+/β+), or mild (β0/β++ or β+/β++). Risk factors for mortality were evaluated using multivariate Cox proportional- hazards regression. Of the 537 subjects who were followed for a total of 20,963 person-years, 80.4% (95% confidence interval [95% CI]: 76.4-84.7) survived to 50 years of age with increasing rates of liver-, infectionand malignancy-related deaths observed during recent follow-up. We evaluated non-modifiable risk factors and found worse outcomes associated with male sex (hazard ratio 1.9, 95% CI: 1.1-3.0, P=0.01) and milder genotype (hazard ratio 1.6, 95% CI: 1.1-2.3, P=0.02). The effect of genotype was confirmed in a second model, which included treatment effects. Patients with a milder genotype initiated transfusion significantly later and had reduced blood requirements compared to those with moderate or severe genotypes, although pre-transfusion hemoglobin levels did not differ between genotypes. Our results suggest that early treatment decisions to delay transfusion and different long-term treatment strategies in individuals with milder genotypes have led to adverse longterm effects of under-treated thalassemia and worse survival. We propose that HBB genotype determination and use of this information to aid in decision-making can improve long-term outcomes of thalassemia patients.
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Affiliation(s)
- Petros Kountouris
- Cyprus Institute of Neurology and Genetics, Cyprus School of Molecular Medicine, Nicosia, Cyprus
| | - Kyriaki Michailidou
- Cyprus Institute of Neurology and Genetics, Cyprus School of Molecular Medicine, Nicosia, Cyprus
| | | | | | - Maria Sitarou
- Thalassemia Centre, Larnaca General Hospital, Larnaca, Cyprus
| | - Anita Kolnagou
- Thalassemia Centre, Paphos General Hospital, Paphos, Cyprus
| | - Marina Kleanthous
- Cyprus Institute of Neurology and Genetics, Cyprus School of Molecular Medicine, Nicosia, Cyprus
| | - Paul Telfer
- Centre for Genomics and Child Health, Blizard Institute, Queen Mary University of London, UK
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8
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Zhang X, Yang Y, Zhang H, Du Z, Liu H, Shen Y. A rare complex rearrangement in the β-globin gene cluster causing a novel homozygous G γ( A γδβ) 0 -thalassemia. Am J Hematol 2021; 96:E189-E193. [PMID: 33651897 DOI: 10.1002/ajh.26148] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 02/24/2021] [Accepted: 02/28/2021] [Indexed: 11/08/2022]
Affiliation(s)
- Xueguang Zhang
- Department of Obstetrics/Gynecology, Joint Laboratory of Reproductive Medicine (SCU‐CUHK), Key Laboratory of Obstetric, Gynecologic and Pediatric Diseases and Birth Defects of Ministry of Education West China Second University Hospital, Sichuan University Chengdu China
| | - Yihong Yang
- Reproduction Medical Center of West China Second University Hospital, Key Laboratory of Obstetric, Gynecologic and Pediatric Diseases and Birth Defects of Ministry of Education Sichuan University Chengdu China
| | - Haixia Zhang
- Department of Obstetrics/Gynecology, Joint Laboratory of Reproductive Medicine (SCU‐CUHK), Key Laboratory of Obstetric, Gynecologic and Pediatric Diseases and Birth Defects of Ministry of Education West China Second University Hospital, Sichuan University Chengdu China
| | - Ze Du
- Department of Obstetrics/Gynecology, Joint Laboratory of Reproductive Medicine (SCU‐CUHK), Key Laboratory of Obstetric, Gynecologic and Pediatric Diseases and Birth Defects of Ministry of Education West China Second University Hospital, Sichuan University Chengdu China
| | - Hongqian Liu
- Department of Obstetrics and Gynecology, West China Second University Hospital of Sichuan University and Key Laboratory of Birth Defects and Related Diseases of Women and Children Sichuan University, Ministry of Education Chengdu China
| | - Ying Shen
- Department of Obstetrics/Gynecology, Joint Laboratory of Reproductive Medicine (SCU‐CUHK), Key Laboratory of Obstetric, Gynecologic and Pediatric Diseases and Birth Defects of Ministry of Education West China Second University Hospital, Sichuan University Chengdu China
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9
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Cheng Y, Shang X, Chen D, Pang D, Zhao C, Xu X. MicroRNA-2355-5p regulates γ-globin expression in human erythroid cells by inhibiting KLF6. Br J Haematol 2020; 193:401-405. [PMID: 33368182 DOI: 10.1111/bjh.17134] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Accepted: 09/08/2020] [Indexed: 12/14/2022]
Abstract
Krüppel-like factors (KLFs) are a highly conserved family of transcription factors. We analysed expression profile data of KLFs and identified KLF6 as a new potential regulator of erythropoiesis. Knocking down the expression of KLF6 significantly raised γ-globin mRNA and protein levels in the erythroid cell line HUDEP-2 and haematopoietic progenitor (CD34+ ) cells. We found that overexpression of microRNA (miR)-2355-5p in HUDEP-2 and CD34+ cells correlated with increased γ-globin synthesis by suppressing expression of KLF6. Our discovery that the interaction between miR-2355-5p and KLF6 affects the expression of γ-globin may provide more information for the clinical management of β-thalassaemia patients.
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Affiliation(s)
- Yi Cheng
- Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China
| | - Xuan Shang
- Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China.,Guangdong Genetics Testing Engineering Research Center, Guangzhou, Guangdong, China.,Guangdong Provincial Key Laboratory of Single Cell Technology and Application, Guangzhou, Guangdong, China
| | - Diyu Chen
- Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China
| | - Dejian Pang
- Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China
| | - Cunyou Zhao
- Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China
| | - Xiangmin Xu
- Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China.,Guangdong Genetics Testing Engineering Research Center, Guangzhou, Guangdong, China.,Guangdong Provincial Key Laboratory of Single Cell Technology and Application, Guangzhou, Guangdong, China
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