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Red blood cell phenotypes in the alpha + thalassaemias from early childhood to maturity
T N Williams1, K Maitland, M Ganczakowski
1Institute of Molecular Medicine, John Radcliffe Hospital, Oxford.
Insights
Alpha-plus thalassaemias, common genetic disorders, significantly impact red blood cell indices like MCV and MCH from childhood to adulthood. Mean cell hemoglobin (MCH) is a key indicator for identifying carriers.
Area of Science:
- Human Genetics
- Hematology
- Population Health
Background:
- Alpha-plus thalassaemias are the most prevalent single-gene disorders globally.
- Limited understanding exists regarding their childhood hematological manifestations.
- High prevalence of alpha-plus thalassaemias in Vanuatu necessitates characterization.
Purpose of the Study:
- To describe the hematological effects of alpha-plus thalassaemias in a South West Pacific population.
- To analyze changes from early childhood through to maturity.
- To establish reference values for populations with high thalassaemia frequency.
Main Methods:
- Random blood sample collection from over 2000 individuals in Vanuatu.
- Analysis of alpha-plus thalassaemia and associated hematological parameters.
- Statistical comparison of Mean Cell Volume (MCV) and Mean Cell Hemoglobin (MCH) across genotypes and age groups.
Main Results:
- Significant differences in MCV and MCH observed among normal, heterozygous, and homozygous genotypes across all ages (2P < 0.05).
- Hemoglobin levels were well-maintained in heterozygous and homozygous individuals throughout development.
- Mean Cell Hemoglobin (MCH) proved to be the most sensitive discriminator for alpha-plus thalassaemia carriers.
Conclusions:
- Hematological data, particularly MCH, are valuable for screening alpha-plus thalassaemia carriers in high-prevalence areas.
- Homozygous adults consistently showed MCH < 27 pg, distinguishing them from normal individuals.
- Findings provide crucial reference values, aiding differentiation from iron-deficiency anemia.
Abstract:
The alpha+ thalassaemias are the most common single gene disorders of humans, yet little is known about their haematological characteristics in childhood. Blood samples have been collected randomly from more than 2000 individuals in village communities in Vanuatu in the South West Pacific and analysed for alpha thalassaemia and associated haematological changes. Here we describe the haematological effects of the alpha+ thalassaemias from early childhood through to maturity in this population. Mean cell volume (MCV) and mean cell haemoglobin (MCH) levels in individuals of normal, heterozygous and homozygous genotype differed significantly from one another throughout the entire age range (2P < 0.05). In contrast, haemoglobin levels in heterozygous and homozygous individuals were well maintained throughout development. Adults of normal genotype attain Hb levels which are indistinguishable from Caucasian reference values, a finding made all the more remarkable given the high frequency of clinical malaria in this population. It is clear from these findings that haematological data are valuable in screening for carriers of alpha+ thalassaemia in this population. MCH is clearly the most sensitive discriminator. None of the homozygous adults tested had an MCH of > 27 pg, whereas < 10% of normals had a value of < 27 pg. These data provide reference values for areas in which the alpha+ thalassaemias are common and often confused with iron-deficiency anaemia.