April 10, 2019


Beta thalassemias are a group of inherited blood disorders. They are forms of thalassemia .. to remove the excess iron. Transmission is autosomal recessive; however, dominant mutations and compound heterozygotes have been reported. Thalassemias are inherited blood disorders characterized by abnormal hemoglobin production. The severity of alpha and beta thalassemia depends on how many of the four genes for alpha globin or two genes for beta globin are missing. Beta thalassemia syndromes are a group of hereditary disorders characterized by a genetic deficiency in the synthesis of beta-globin chains. In the homozygous .

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Adverse effects are primary skin reactions around the injection site and hearing loss.

Beta thalassemia – Wikipedia

The thalassemia trait may confer a degree of protection against malaria[54] which is or was prevalent in the regions where the neterozygote is common, thus conferring a selective survival advantage on carriers known as heterozygous advantagethus perpetuating the mutation. Wikipedia articles needing page number citations from May Infobox medical condition new Pages using infobox medical condition with unknown parameters All articles with unsourced statements Articles with unsourced statements from August Articles with unsourced statements from May Fanconi anemia Diamond—Blackfan anemia Acquired: T cell-depleted hla-haploidentical stem cell transplantation in thalassemia young patients.

Echocardiographic finding in beta-thalassemia intermedia and major: For a detailed summary of gene and protein information, see Table AGene. Treatment involves appropriate hormonal replacement, an effective regimen of transfusion and iron chelation, vitamin D administration, and regular physical activity. Most of these HBB pathogenic variants lie in the third exon and lead to the production of a markedly unstable Hb variant often not detectable in peripheral blood.


Three main forms have been described: The child was born from an embryo screened to be free of the disease before implantation with in vitro fertilization. Included Phenotypes Thalassemia major. Department of Medical Sciences.

They should avoid routine use of iron supplements ; iron deficiency can develop, though, during pregnancy or from chronic bleeding. Alternatively, in case of an affected fetus and a previous unaffected child, the couple may decide to continue the pregnancy and pursue BMT later, using the unaffected child as the donor.

The associated complications of iron overload present later, but may be as severe as those seen in individuals with thalassemia major who depend on transfusions. As with about half of all hereditary diseases, [18] an inherited mutation damages heterozyhote assembly of the messenger-type RNA mRNA that is transcribed from a chromosome. betaa

HBB sequencing establishes the diagnosis. A number sign is used with this entry because beta-thalassemia can be caused by homozygous or compound heterozygous mutation in the beta-globin gene HBB; on hfterozygote 11p Strategies of chelation using a combination of desferrioxamine and deferiprone have been effective in individuals with severe iron overload.

GeneReviews staff have not independently verified the classification of variants. The most common patient deferoxamine complaint is that they are painful and inconvenient. HSP70 sequestration by free alpha-globin promotes heterozyogte erythropoiesis in beta-thalassaemia. Hemopoietic stem cell transplantation in thalassemia: Noninvasive prenatal diagnosis of monogenic diseases by targeted massively parallel sequencing of maternal plasma: Malay, E, and Knossos.

Beta-Thalassemia – GeneReviews® – NCBI Bookshelf

Iron rich patients need a splenectomy to reduce the probability of an iron overload. Harteveld et al []Shooter et al []Reading et al []. Northern California Comprehensive Thalassemia Center. Thalassemia intermedia should be suspected in individuals who present at a later age with similar but milder clinical findings.


Affected individuals can often manage a normal life but may need occasional transfusions, e.


Handbook of Iron Overload Disorders. Carrier testing for at-risk relatives can be done by hematologic or molecular genetic testing. However, those not thaassemie will have a much shortened lifespan.

Prevention of secondary complications: It however is not effective in everyone and is probably not suitable in those with significant cardiac issues related to iron overload. Treatment depends on the type and severity.

Beta thalassemia

Retrospective, prospective, and randomized clinical studies have shown that combined iron chelation with desferrioxamine and deferiprone rapidly reduces myocardial siderosis, improves cardiac and thalassemei function, reduces liver iron and serum ferritin concentration, reduces cardiac mortality, and improves survival; toxicity is thalasssmie [ Tanner et alGalanello et al ].

Association of alpha globin gene quadruplication and heterozygous beta thalassemia in patients with thalassemia intermedia. Treatment with a regular transfusion program and chelation therapy, aimed at reducing transfusion iron overload, allows for normal growth and development and may improve the overall prognosis. Archived from the original on 19 November Hematologic testing can be used if the pathogenic variants in the family are not known.

Family studies can be done thalaesemie evaluate carrier status and the types of mutations present in other family members.

Indian Journal of Human Genetics. Treatment of individuals with thalassemia intermedia is symptomatic and based on splenectomy and folic acid supplementation. Retrieved 5 September