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Glucose-6-phosphate dehydrogenase deficiency and homozygous sickle cell disease in Congo
J C Bouanga1, R Mouélé, C Préhu
1INSERM U474, Hôpital Henri-Mondor, Créteil, France.
Insights
Glucose-6-phosphate dehydrogenase (G6PD) deficiency showed no biological advantage in sickle cell disease (HbSS) patients in Congo. G6PD genotype frequencies did not differ between patients and controls, indicating no protective effect.
Area of Science:
- Genetics
- Hematology
- Molecular Biology
Background:
- Sickle cell disease (HbSS) is a significant health concern.
- Glucose-6-phosphate dehydrogenase (G6PD) deficiency is a common genetic disorder.
- The potential protective role of G6PD deficiency against HbSS complications is debated.
Purpose of the Study:
- To investigate the prevalence of G6PD genotypes in HbSS patients and controls in Brazzaville, Congo.
- To determine if G6PD deficiency offers any biological advantage to individuals with HbSS.
- To analyze the association between G6PD genotypes and hematological parameters in HbSS patients.
Main Methods:
- Genotyping of G6PD alleles (B, A+, A-) using polymerase chain reaction (PCR).
- Analysis of DNA samples from 188 HbSS patients and 210 healthy controls.
- Comparison of allele frequencies and hematological parameters (red blood cell count, MCV, MCH, Hb level) between groups.
Main Results:
- G6PD allele frequencies (B, A+, A-) were similar between HbSS patients (56.9%, 20.8%, 22.2%) and controls (56.3%, 21.2%, 22.5%).
- No statistically significant difference in G6PD genotype prevalence was observed between HbSS patients and controls (p > 0.05).
- Lower hemoglobin (Hb) levels were noted in HbSS patients with the G6PD A- genotype, but other hematological parameters remained unaffected.
Conclusions:
- G6PD deficiency does not appear to confer a biological advantage to individuals with HbSS in the studied Congolese population.
- The prevalence of G6PD deficiency is not significantly different in HbSS patients compared to the general population.
- Further research may explore specific G6PD variants and their interaction with HbSS severity.
Abstract:
G6PD genotypes were determined in Brazzaville (Congo) on 188 HbSS patients (109 females, 79 males) and 210 controls (115 females and 95 males) with HbAA. DNA samples were analyzed by the polymerase chain reaction (PCR). The frequencies of G6PD B, A+ and A- alleles were 56.9, 20.8 and, 22.2% in the patients versus 56.3, 21.2 and, 22.5% in the controls, respectively. The prevalence of G6PD genotypes in HbSS did not differ (p > 0.05) from that found in the controls. Prevalence of G6PD deficiency did not change when patients were stratified by age, suggesting that there is no advantage of the association of G6PD deficiency with HbSS. Red blood cell count, mean corpuscular volume and mean corpuscular hemoglobin were not modified by the G6PD genotypes, while Hb level was lower in HbSS with G6PD A-. Our study suggests that in Congo, G6PD deficiency does not offer any biological advantage to sicklers.