Two decades of pre-marital screening for beta-thalassemia in central Iran

Spectrum of Beta-Thalassemia Mutations in Potential Carriers with Microcytic Hypochromic Anemia from Mazandaran and Golestan, Northern Provinces of Iran

Introduction

β-Thalassaemia is the most common genetic disorder and is considered as a major public health concern in Iran. Different countrywide studies have shown a heterogeneous mutational basis of β-thalassaemia with different frequencies in each area. This study is aimed at investigating the common and rare mutations in Mazandaran and Golestan, northern provinces of Iran.

Methods

5425 microcytic and hypochromic individuals were investigated from Mazandaran and Golestan provinces. From these, 1323 beta carrier or affected individuals were selected where 938 persons were from Mazandaran and 385 people were from Golestan province, respectively.

Result

53 different mutations were identified, IVSII-1 (G>A) was the most common (59.14%) followed by Cd 22/23/24 (-7 bp) (5.34%), Cd 8 (-AA) (4.93%), Cd30 (G>A) (4.00%), and IVSI-5 (G>C) (3.70%) with a total of 77.11% in Mazandaran Province, respectively. In Golestan Province, IVSI-5 (G>C) was the most frequent (44.62%) followed by IVSII-1 (G>A) (27.18%), Cd 15 (TGG>TAG) (4.36%), Fr 8/9(+G) (3.85%), and Cd 8(-AA) (2.05%) with a total of 82.06%, respectively. From the 53 different mutations, 22 numbers have been observed in both provinces. Two deletions of the beta gene named Sicilian and Asian-Indian have been detected in Mazandaran with a frequency of 0.72% each.

Conclusion

The 53 different mutations identified in this study were the most ever reported mutations in the country. Due to diversity of different ethnic groups, there are many varieties of mutation in beta globin gene in Iran. It could be assumed that both founder effect and natural selection caused by migration from neighboring areas have complemented each other to produce the high frequency of unique alleles within each region.

Beta Thalassemia Carrier Rate: Problem Burden among High School Children

Background & Aim of the Work: β-Thalassemia (βT) is highly prevalent in some countries like Egypt. Accurate data about actual disease prevalence and heavily prevalent geographic locations are essential to help in early detection and in setting up effective preventive programs. We aim for screening βT carriers among Egyptian high school students in the Delta region.

SUBJECTS AND METHODS

A cross-sectional multicenter study was carried out on 4320 randomly selected students from four governorates of the Nile Delta region, Egypt. All patients were to be tested for their complete blood count. Those with microcytic hypochromic anemia not caused by iron deficiency were tested for βT carrier status using high-performance liquid chromatography.

RESULTS

The total prevalence of βT carrier rate was 6.13%. The highest prevalence was detected in Al-Sharkia Governorate, reaching 7.89%, followed by 6.90% in Al-Gharbia Governorate. Al- Dakahilia and Al-Menoufia showed lower rates of 4.86% and 3.73%, respectively.

CONCLUSION

Despite the premarital national screening program for βT in Egypt, the carrier rate is still high. More effort should be done into the proper implementation of national prevention programs.

Methods to estimate access to care and the effect of interventions on the outcomes of congenital disorders

In the absence of intervention, early-onset congenital disorders lead to pregnancy loss, early death, or disability. Currently, lack of epidemiological data from many settings limits the understanding of the burden of these conditions, thus impeding health planning, policy-making, and commensurate resource allocation. The Modell Global Database of Congenital Disorders (MGDb) seeks to meet this need by combining general biological principles with observational and demographic data, to generate estimates of the burden of congenital disorders. A range of interventions along the life course can modify adverse outcomes associated with congenital disorders. Hence, access to and quality of services available for the prevention and care of congenital disorders affects both their birth prevalence and the outcomes for affected individuals. Information on this is therefore important to enable burden estimates for settings with limited observational data, but is lacking from many settings. This paper, the third in this special issue on methods used in the MGDb for estimating the global burden of congenital disorders, describes key interventions that impact on outcomes of congenital disorders and methods used to estimate their coverage where empirical data are not available.

Changes in Attitudes towards Marriage and Reproduction among People with a Genetic Illness

In this article, the change in attitude towards marriage and reproduction among Iranian people with a genetic illness called thalassemia has been investigated, along with an analysis of the impact brought by the national thalassemia prevention programmes, which were introduced to discourage marriage between carriers (thalassemia minor) and the birth of severe homozygous cases (thalassemia major). Marriage and reproductive choices of people with both thalassemia minor and thalassemia major were focused upon in order to prevent the birth of affected babies. Thalassemia carrier couples prefer to choose abortion of affected foetuses, rather than giving up their marriage, and some people with thalassemia major choose a person with thalassemia major as a marriage partner, though they must give up having their own child.

Carrier screening for beta-thalassemia in the Maldives: perceptions of parents of affected children who did not take part in screening and its consequences

The Republic of Maldives (Maldives) is an island nation in the Indian Ocean with a population of 344, 023. Studies show that Maldives has one of the world's highest thalassemia carrier rates. It is estimated that 16-18 % of the Maldivians are β-thalassemia carriers, and approximately 28 new β-thal cases are recorded annually. Poor uptake of screening for the condition is one of the main reasons for this high number of new cases. The aim of this study was to explore the reasons for not testing for thalassemia in Maldives before or after marriage. Findings show that participants did not undergo carrier tests because of poor awareness and not fully knowing the devastating consequences of the condition. The outcomes of not testing were distressing for most participants. Religion played a vital role in all the decisions made by the participants before and after the birth of a β-thal child.

The pros and cons of the fourth revision of thalassaemia screening programme in Iran

Objective

To evaluate the repercussions of recent changes to the cut-offs used in the first screening step of the pre-marital screening programme for thalassaemia prevention in Iran.

Methods

The profiles of 984 subjects referred to a genetic laboratory, and the tests of 242 parents of children with thalassaemia major were assessed for red blood cell (RBC) indices, haemoglobin (Hb) A2 levels and results of Hb electrophoresis.

Results

Of 407 suspected thalassaemia minor (STM) cases, 18 proved positive for thalassaemia minor on molecular analysis (18/407, confidence interval 2.6–6.9%). If the revised screening cut-offs had been used to determine who would undergo molecular analysis, two of these cases would not have been identified. Only 4.4% of suspected cases with lower than normal RBC indices (mean corpuscular volume <80 fl and mean corpuscular Hb <27 pg) and HbA2 (<3.5%) were diagnosed with thalassaemia minor.

Conclusion

The thalassaemia major prevention programme is performed in two separate steps. One step involves the screening of subjects and identification of β-thalassaemia minor, suspected cases for thalassaemia minor (STM), and normal subject groups. The other step concerns the identification of thalassaemia minor in the STM group. Changing the cut-offs at the first screening step does not result in significant improvement from an economic view, and is associated with significant risk at the second screening step.

Guidelines for the Standard Monitoring of Patients With Thalassemia: Report of the Thalassemia Longitudinal Cohort

Chronic transfusion therapy has played a central role in extending life expectancy for patients with hemoglobinopathies such as thalassemia. However, this life-saving therapy is associated with numerous complications that now comprise the bulk of management considerations for patients with thalassemia. This review reports on the experience of the Thalassemia Longitudinal Cohort and reviews available literature to establish guidelines for the management of patients with thalassemia.

The Iran Thalassemia Prevention Program: Success or Failure?

BACKGROUND

Iran is one of the countries located on the "thalassemia belt" and a thalassemia prevention program was approved in our country in 1995. Many different researchers have studied the success of this program with no unanimous findings.

MATERIAL AND METHODS

A comprehensive literature search was performed using PubMed, Web of Science, and Google Scholar databases in Farsi and English languages for relevant articles published up to March 2015.

RESULTS

A total of 46 articles regarding thalassemia prevention were identified. After screening the titles and abstracts, 27 articles were excluded because they were the same articles, review articles, and case reports. Finally, 16 articles about the success of the Iranian thalassemia prevention program were selected for the evaluation.

CONCLUSION

The findings show that the program has been significantly successful in the reduction of the new thalassemia births, though not in a few provinces like Sistan and Baluchestan. The role of the network of genetic labs has been also indispensable in the reduction of the new births. However, there is ambiguity over the impact of the program on the attitude and awareness of people across the country about the prevention of inherited diseases. However, with the success of the Iran thalassemia prevention program, it needs to be modified to be more compatible with the relevant social textures of different provinces.

Diagnosis and prevention of thalassemia

Thalassemia is the most common monogenic inherited disease worldwide and it affects most countries to various extents. This review summarizes the current approaches to phenotypic and genotypic diagnosis of thalassemia in clinical practice. Prevention strategies that encompass carrier screening, genetic counseling and prenatal diagnosis are discussed. The importance of public education and an awareness of a changing perception regarding this group of diseases are emphasized. It also addresses the impact of the rapidly increasing knowledge in disease severity modification by hemoglobin F (Hb F).