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Using DNA testing for the precise, definite, and low-cost diagnosis of sickle cell disease and other Haemoglobinopathies: findings from Tanzania

Authors
  • Christopher, Heavenlight1
  • Burns, Adam2
  • Josephat, Emmanuel1
  • Makani, Julie1
  • Schuh, Anna1, 2
  • Nkya, Siana1, 3
  • 1 Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania , Dar es Salaam (Tanzania)
  • 2 Oxford Molecular Diagnostics Centre, University of Oxford, Oxford, UK , Oxford (United Kingdom)
  • 3 Dar es Salaam University College of Education (DUCE), Dar es Salaam, Tanzania , Dar es Salaam (Tanzania)
Type
Published Article
Journal
BMC Genomics
Publisher
Springer (Biomed Central Ltd.)
Publication Date
Dec 16, 2021
Volume
22
Issue
1
Identifiers
DOI: 10.1186/s12864-021-08220-x
Source
Springer Nature
Keywords
Disciplines
  • Research
License
Green

Abstract

BackgroundSickle cell disease (SCD) is an important cause of under-five mortality. Tanzania is the 5th country in the world with the highest births prevalence of SCD individuals. Significant advances in the neonatal diagnosis of SCD using rapid point-of-care testing have been made. However genetic confirmation is still required for positive cases, in uncertain cases, in multiply transfused patients, to resolve compound heterozygosity (Hb S/ β0 Thal or Hb S/ β+ thal) not uncommon in the coastal regions of East Africa and increasingly also for pre-marital counselling and potentially for future curative approaches such as gene therapy. The currently available DNA tests are prohibitively expensive. Here, we describe an easy-to-use, affordable and accurate β-globin sequencing approach that can be easily integrated within existing NBS for SCD and other haemoglobinopathies especially in Low- and Middle-income Countries.AimTo evaluate an affordable DNA technology for the diagnosis of Sickle cell disease and other haemoglobinopathies in a resource-limited setting.MethodsLaboratory-based validation study was conducted by Muhimbili University of Health and Allied Sciences and the University of Oxford involving sequencing of the entire β -haemoglobin locus using the Oxford Nanopore MinION platform. A total number of 36 Dried blood spots and whole blood samples were subjected to conventional protein-based methods (isoelectric focusing, HPLC), and/or sequenced by the Sanger method as comparators.ResultsSequencing results for SCD using the MinION were 100% concordant with those from the Sanger method. In addition, the long-read DNA sequencing method enabled the resolution of cases with unusual phenotypes which make up 1% of all children in Tanzania. The cost is £11/ sample for consumables, which is cheaper compared to other sequencing platforms.ConclusionsThis is the first report of a comprehensive single DNA assay as a definitive diagnostic test for SCD and other haemoglobinopathies. The test is fast, precise, accurate and affordable.

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