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Neonatal screening for haemoglobinopathies: the results of a 10-year programme in an English Health Region
A M Almeida1, J S Henthorn, S C Davies
1Department of Haematology, Central Middlesex Hospital, London, UK.
Insights
Neonatal screening for sickle cell disease and other inherited blood disorders is crucial. Early identification via isoelectric focusing significantly reduces infant mortality and aids healthcare planning.
Area of Science:
- Medical Genetics
- Public Health
- Hematology
Background:
- Neonatal identification of sickle cell disease (SCD) is vital for reducing early childhood mortality and morbidity.
- Understanding the prevalence of hemoglobin variants and thalassemias is essential for effective public health strategies.
Purpose of the Study:
- To report the findings of a 10-year neonatal screening program for hemoglobinopathies.
- To determine the gene frequencies of common hemoglobin variants (S, C, D, E) in the screened population.
- To highlight the importance of newborn screening for inherited blood disorders in healthcare planning.
Main Methods:
- Isoelectric focusing was used to screen 414,801 neonates over a 10-year period.
- Analysis included identification of homozygotes, compound heterozygotes, and heterozygotes for common hemoglobin variants.
- Gene frequencies were calculated based on the screened population data.
Main Results:
- Common variants detected included hemoglobins S, C, D, and E.
- Gene frequencies were calculated: S (0.0057), C (0.0014), D (0.0007), and E (0.0005).
- 16 cases of beta thalassaemia major and 405 rarer variants (six novel) were identified.
Conclusions:
- Neonatal screening effectively identifies sickle cell disease and other inherited blood disorders.
- Data on gene distribution aids in healthcare planning and resource allocation.
- Targeted genetic counseling empowers informed parental choices and disease prevention.
Abstract:
Neonatal identification of sickle cell disease can significantly reduce mortality and morbidity during the first 5 years of life. During a 10-year period, 414,801 neonates were screened by isoelectric focusing. The most common variants detected were haemoglobins S, C, D and E. Two hundred and fifty of the samples tested were homozygotes or compound heterozygotes, and 6554 samples were heterozygotes for the common variants. The gene frequencies in the population tested were calculated from this data for the most common variants. They were: S, 0.0057; C, 0.0014; D(Punjab(Los Angeles)), 0.0007; E, 0.0005. Additionally, 16 babies had beta thalassaemia major and 405 had rarer variants, of which six had never previously been described. Knowledge of the distribution of these inherited diseases is useful in healthcare planning and appropriate allocation of resources, while counselling targeted at appropriate couples enables informed parental choice and may prevent disease.