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Updated: Sep 13, 2025

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Clinical and Genetic Predictors of Sickle Cell Nephropathy: A Global Systematic Review
Kambe Banda1, Arthemon Nguweneza1, Khuthala Mnika1
1Division of Human Genetics, Department of Pathology, University of Cape Town, Cape Town, South Africa.
Insights
Sickle cell nephropathy (SCN) risk factors, including genetic variants like APOL1 and HMOX1, are identified in this global review. More research is needed in Africa to improve early detection and management of kidney disease in sickle cell disease (SCD) patients.
Area of Science:
- Nephrology
- Hematology
- Genetics
Background:
- Sickle cell disease (SCD) affects 300,000 newborns globally, with 80% in Africa.
- Sickle cell nephropathy (SCN) impacts 5-18% of SCD patients, significantly increasing morbidity and mortality.
- Identifying SCN risk factors is crucial for effective clinical management and public health strategies.
Purpose of the Study:
- To conduct a global systematic review exploring clinical and genetic factors associated with sickle cell nephropathy (SCN).
- To identify predictors of SCN across diverse global populations.
- To summarize current evidence on SCN risk factors and highlight research gaps.
Main Methods:
- Systematic review adhering to PRISMA guidelines (PROSPERO registration: CRD42020185763).
- Inclusion of cohort, case-control, and cross-sectional studies published up to December 31, 2024.
- Analysis of 70 hospital-based studies, with a focus on clinical and genetic predictors of SCN.
Main Results:
- Genetic associations identified with alpha-thalassemia, APOL1, and HMOX1 genes.
- A genome-wide association study suggested variants in CRYL1, VWF, ADAMTS7, LRP1B, linc02288, and FPGT-TNNI3K/TNNI3K.
- Consistent association of SCN with the 3.7 Kb deletion in HBA and variants in APOL1 and HMOX1 genes.
Conclusions:
- Clinical, genetic, and biochemical factors play a significant role in SCN pathogenesis and progression.
- This review highlights the consistent association of SCN with specific genetic factors, including APOL1 and HMOX1.
- There is a critical need for more research, particularly large-scale prospective studies in African SCN cohorts, to address data paucity and improve SCN risk identification and management.
Abstract:
Sickle cell disease (SCD) affects nearly 300,000 newborns annually worldwide, with 80% born in Africa. Sickle cell nephropathy (SCN) affects 5-18% of patients with SCD and contributes significantly to morbidity and mortality. Identifying SCN-associated factors would promote effective clinical management. We conducted a global systematic review in accordance with the Preferred Reporting Items for Systematic Review and Meta-Analysis guidelines (Prospective Register of Systematic Reviews, registration number: CRD42020185763) to explore clinical and genetic correlates of SCN. We sought after cohort, case-control, and cross-sectional studies published up to December 31, 2024 that reported on clinical and/or genetic predictors of SCN in different populations globally. A total of 70 hospital-based study articles were finally included, with a leading percentage (45.7%) of the included studies performed in the United States, whereas 24.3% were from Sub-Saharan Africa. Most had a cross-sectional design (68.6%) involving children and adults. Genetic studies (17/70) identified associations with α-thalassemia, APOL1, and HMOX1 genes. The only genome-wide association study identified six suggestive variants in CRYL1, VWF, ADAMTS7, LRP1B, linc02288, and FPGT-TNNI3K/TNNI3K among adult patients. In conclusion, this systematic review (1) unpacks and highlights the role of clinical, genetic, and biochemical factors in the pathogenesis and progression of SCN and (2) reveals the consistent association of SCN with the 3.7 Kb deletion in HBA and variants in APOL1 and HMOX1 genes. This systematic review underscores the paucity of data from Africa, emphasizing the need for large-scale prospective studies on African SCN cohorts. Our findings also provide a foundation for the early identification of individuals at risk for SCN and the avenues for clinical and public health management strategies. To the best of our knowledge, this is the first systematic review summarizing risk factors for kidney dysfunction in SCD populations worldwide, which includes, specifically, a meta-analysis for APOL1 association with albuminuria.
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