Abstract
Millions are affected by sickle cell disease (SCD) worldwide with the greatest burden in sub-Saharan Africa. While its origin lies historically within the malaria belt, ongoing changes in migration patterns have shifted the burden of disease resulting in a global public health concern. We created the Consortium for the Advancement of Sickle Cell Research (CASiRe) to understand the different phenotypes of SCD across 4 countries (USA, UK, Italy, and Ghana). Here, we report the multi-generational ethnic and racial background of 877 SCD patients recruited in Ghana (n = 365, 41.6%), the USA (n = 254, 29%), Italy (n = 81, 9.2%), and the UK (n = 177, 20.2%). West Africa (including Benin Gulf) (N = 556, 63.4%) was the most common geographic region of origin, followed by North America (N = 184, 21%), Caribbean (N = 51, 5.8%), Europe (N = 27, 3.1%), Central Africa (N = 24, 2.7%), and West Africa (excluding Benin Gulf) (N = 21, 2.4%). SCD patients in Europe were primarily West African (73%), European (10%), Caribbean (8%), and Central African (8%). In the USA, patients were largely African American (71%), Caribbean (13%), or West African (10%). Most subjects identified themselves as Black or African American; the European cohort had the largest group of Caucasian SCD patients (8%), including 21% of the Italian patients. This is the first report of a comprehensive analysis of ethnicity within an international, transcontinental group of SCD patients. The diverse ethnic backgrounds observed in our cohort raises the possibility that genetic and environmental heterogeneity within each SCD population subgroup can affect the clinical phenotype and research outcomes.
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Acknowledgments
Thanks to Adetola Kassim, Vishwas Sakhalkar for their help in developing the questionnaire and protocol.
Funding
We would like to thank the following individuals for their contributions to this work:
Students of the University of Michigan Minority Health and Health Disparities International Research Training (MHIRT) program (Funding support: Grant # NIMHD T37MD001425), Ahmed Owda, Duna Buttner, Biana D. Oteng, Sophia Akatue, Ashya Smith, Austin Novarra, Clementine Fu, Fitz Tavernier, Lewis Graham, Rose Bamfo, Esther Kim, Haikel Halle, Rebekah Urbonya, Fatimah Farooq, Sheri Van Omen, Marianna Yamamoto.
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AC and RC wrote the manuscript and contributed equally to this work. BA, CS (Ghana), IT, CP, DM, EVA, DB, AR, WZ, CS (USA), BI, and CAB critically edited the manuscript. AC, RC BA, CS (USA), CP, IT, DM, DB, RU, WZ, BI, and CAB helped design the study, performed the research, and analyzed the data. EVA, DB, FF, GDB, SR, FS, and CS (Ghana) performed the research and analyzed the data. AR, FS, and LS helped design the study and analyzed the data. FS, LS, and SR reviewed the manuscript.
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A Campbell: research funding and consultancy from Global Blood Therapeutics (GBT), Novartis, Cyclerion; consultancy from BluebirdBio; D Manwani: research funding from Grifols; consultancy for Novartis, Pfizer, Global Blood Therapeutics; B Andemariam: consultancy for Novartis, Pfizer, NovoNordisk, Emmaus, Cyclerion, Terumo, Sanofi; DSMB: Global Blood Therapeutics; research funding: Imara; B Inusa: education funding: Novartis AstraZeneca, Global Blood Therapeutics, Celgene, Vertex; C. Strunk: consultancy Global Blood Therapeutics and Novartis; R Colombatti: research funding: Global Blood Therapeutics, Novartis. No disclosures to declare from the other co-authors.
Informed Consent and Research Involving Human Participants and/or Animals
Except at two sites (Guys and St Thomas Hospital, UK; Azienda Ospedaliera-Università di Padova, Italy) that had a previously Institutional Review Board–approved Sickle Cell Disease Registry, Institutional Review Board approval was obtained at each site and written informed consent was obtained by each patient and/or parent/guardian.
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Campbell, A.D., Colombatti, R., Andemariam, B. et al. An Analysis of Racial and Ethnic Backgrounds Within the CASiRe International Cohort of Sickle Cell Disease Patients: Implications for Disease Phenotype and Clinical Research. J. Racial and Ethnic Health Disparities 8, 99–106 (2021). https://doi.org/10.1007/s40615-020-00762-2
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DOI: https://doi.org/10.1007/s40615-020-00762-2