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Hpa-I polymorphism and the sickle gene in Nigerians
1Postgraduate Institute of Medical Research and Training, College of Medicine, University College Hospital, Ibadan, Nigeria.
Tropical and Geographical Medicine
|April 1, 1989
Summary
Hpa-I restriction fragment length polymorphism analysis in Nigerian subjects reveals specific beta globin gene linkages. These genetic associations may impact the accuracy of prenatal diagnosis for sickle cell anemia in this population.
Area of Science:
- Genetics
- Molecular Biology
- Population Studies
Background:
- Sickle cell anemia is a significant public health concern.
- Understanding beta globin gene polymorphisms is crucial for genetic diagnostics.
- Hpa-I restriction fragment length polymorphism (RFLP) is a known marker for beta globin gene variations.
Purpose of the Study:
- To investigate the Hpa-I RFLP patterns linked to beta globin genes in a Nigerian population.
- To assess the utility of Hpa-I RFLP for prenatal diagnosis of sickle cell anemia in this demographic.
Main Methods:
- Analysis of Hpa-I restriction fragment length polymorphism.
- Study conducted on 181 Nigerian subjects.
- Examination of linkages between beta S and beta A genes with specific Hpa-I fragments (13 kb, 7.6 kb, 7.0 kb).
Main Results:
- The beta S gene was predominantly linked to the 13 kb Hpa-I fragment (98.4%).
- The beta A gene was mainly associated with the 7.6 kb or 7.0 kb fragments (94.2%).
- A notable proportion of beta A genes were linked to the 13 kb fragment (5.8%), and a small fraction of beta S genes to the 7.6 kb fragment (1.6%).
Conclusions:
- The observed Hpa-I RFLP patterns, particularly the beta A 13 kb linkage and beta S 7.6 kb linkage, may reduce the accuracy of Hpa-I RFLP for sickle cell anemia prenatal diagnosis in Nigerians.
- Further studies may be needed to refine diagnostic approaches for this population.