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Thalesamia PDF Print E-mail
Written by Administrator   
Tuesday, 21 June 2011 03:30


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Thalassemia is a blood-related disease due to congenital complexities:


Thalassemia (also spelled thalassaemia) is an inherited autosomal recessive blood disease that originated in the Mediterranean region. In thalassemia the genetic defect, which could be either mutation or deletion, results in reduced rate of synthesis or no synthesis of one of the globin chains that make up hemoglobin. This can cause the formation of abnormal hemoglobin molecules, thus causing anemia, the characteristic presenting symptom of the thalassemias.

Thalassemia is a quantitative problem of too few globins synthesized, whereas sickle-cell disease (a hemoglobinopathy) is a qualitative problem of synthesis of an incorrectly functioning globin. Thalassemias usually result in underproduction of normal globin proteins, often through mutations in regulatory genes. Hemoglobinopathies imply structural abnormalities in the globin proteins themselves.[1] The two conditions may overlap, however, since some conditions which cause abnormalities in globin proteins (hemoglobinopathy) also affect their production (thalassemia). Thus, some thalassemias are hemoglobinopathies, but most are not. Either or both of these conditions may cause anemia.

The two major forms of the disease, alpha- and beta- (see below), are prevalent in discrete geographical clusters around the world - probably associated with malarial endemicity in ancient times. Alpha is prevalent in peoples of Western African and South Asian descent. It is nowadays found in populations living in Africa and in the Americas. It is also found in Tharu in the Terai region of Nepal and India.[2] and is believed to account for much lower incidence of morbidity and mortality,[3] accounting for the historic ability of Tharus to survive in heavily malarial areas where others could not.

Beta thalassemia is particularly prevalent among Mediterranean peoples, and this geographical association was responsible for its naming: Thalassa (╬Ş╬Č╬╗╬▒¤â¤â╬▒) is Greek for the sea, Haema (╬▒ß╝Ě╬╝╬▒) is Greek for blood. In Europe, the highest concentrations of the disease are found in Greece, coastal regions in Turkey, in particular, Aegean Region such as Izmir, Balikesir, Aydin, Mugla and Mediterranean Region such as Antalya, Adana, Mersin, in parts of Italy, in particular, Southern Italy and the lower Po valley. The major Mediterranean islands (except the Balearics) such as Sicily, Sardinia, Malta, Corsica, Cyprus and Crete are heavily affected in particular. Other Mediterranean people, as well as those in the vicinity of the Mediterranean, also have high rates of thalassemia, including people from West Asia and North Africa. Far from the Mediterranean, South Asians are also affected, with the world's highest concentration of carriers (16% of the population) being in the Maldives.

The thalassemia trait may confer a degree of protection against malaria, which is or was prevalent in the regions where the trait is common, thus conferring a selective survival advantage on carriers (known as heterozygous advantage), and perpetuating the mutation. In that respect the various thalassemias resemble another genetic disorder affecting hemoglobin, sickle-cell disease.[4]



Normal hemoglobin is composed of four protein chains, two ╬▒ and two ╬▓ globin chains arranged into a heterotetramer. Thalassemia patients produce a deficiency of either ╬▒ or ╬▓ globin, unlike sickle-cell disease which produces a specific mutant form of ╬▓ globin.

The thalassemias are classified according to which chain of the hemoglobin molecule is affected. In ╬▒ thalassemias, production of the ╬▒ globin chain is affected, while in ╬▓ thalassemia production of the ╬▓ globin chain is affected.

╬▓ globin chains are encoded by a single gene on chromosome 11; ╬▒ globin chains are encoded by two closely linked genes on chromosome 16. Thus in a normal person with two copies of each chromosome, there are two loci encoding the ╬▓ chain, and four loci encoding the ╬▒ chain. Deletion of one of the ╬▒ loci has a high prevalence in people of African or Asian descent, making them more likely to develop ╬▒ thalassemias. ╬▓ thalassemias are common in Africans, but also in Greeks and Italians.

Alpha (╬▒) thalassemias

The ╬▒ thalassemias involve the genes HBA1[5] and HBA2,[6] inherited in a Mendelian recessive fashion. There are two gene loci and so four alleles. It is also connected to the deletion of the 16p chromosome. ╬▒ thalassemias result in decreased alpha-globin production, therefore fewer alpha-globin chains are produced, resulting in an excess of ╬▓ chains in adults and excess ╬│ chains in newborns. The excess ╬▓ chains form unstable tetramers (called Hemoglobin H or HbH of 4 beta chains) which have abnormal oxygen dissociation curves.

Beta (╬▓) thalassemias

Beta thalassemias are due to mutations in the HBB gene on chromosome 11 ,[7] also inherited in an autosomal-recessive fashion. The severity of the disease depends on the nature of the mutation. Mutations are characterized as either ╬▓o or ╬▓ thalassemia major if they prevent any formation of ╬▓ chains, the most severe form of ╬▓ thalassemia. Alternatively they are characterized as ╬▓+ or ╬▓ thalassemia intermedia if they allow some ╬▓ chain formation to occur. In either case there is a relative excess of ╬▒ chains, but these do not form tetramers: rather, they bind to the red blood cell membranes, producing membrane damage, and at high concentrations they form toxic aggregates.

Delta (╬┤) thalassemia

As well as alpha and beta chains being present in hemoglobin about 3% of adult hemoglobin is made of alpha and delta chains. Just as with beta thalassemia, mutations can occur which affect the ability of this gene to produce delta chains[citation needed].

In combination with other hemoglobinopathies

Thalassemia can co-exist with other hemoglobinopathies. The most common of these are:

  • hemoglobin E/thalassemia: common in Cambodia, Thailand, and parts of India; clinically similar to ╬▓ thalassemia major or thalassemia intermedia.
  • hemoglobin S/thalassemia, common in African and Mediterranean populations; clinically similar to sickle cell anemia, with the additional feature of splenomegaly
  • hemoglobin C/thalassemia: common in Mediterranean and African populations, hemoglobin C/╬▓o thalassemia causes a moderately severe hemolytic anemia with splenomegaly; hemoglobin C/╬▓+ thalassemia produces a milder disease.


Thalassemia has an autosomal recessive pattern of inheritance

╬▒ and ╬▓ thalassemia are often inherited in an autosomal recessive fashion although this is not always the case. Cases of dominantly inherited ╬▒ and ╬▓ thalassemias have been reported, the first of which was in an Irish family who had a two deletions of 4 and 11 bp in exon 3 interrupted by an insertion of 5 bp in the ╬▓-globin gene. For the autosomal recessive forms of the disease both parents must be carriers in order for a child to be affected. If both parents carry a hemoglobinopathy trait, there is a 25% chance with each pregnancy for an affected child. Genetic counseling and genetic testing is recommended for families that carry a thalassemia trait.

There are an estimated 60-80 million people in the world who carry the beta thalassemia trait alone.[citation needed] This is a very rough estimate and the actual number of thalassemia major patients is unknown due to the prevalence of thalassemia in less developed countries.[citation needed] Countries such as India and Pakistan are seeing a large increase of thalassemia patients due to lack of genetic counseling and screening.[citation needed] There is growing concern that thalassemia may become a very serious problem in the next 50 years, one that will burden the world's blood bank supplies and the health system in general.[citation needed] There are an estimated 1,000 people living with thalassemia major in the United States and an unknown number of carriers.[citation needed] Because of the prevalence of the disease in countries with little knowledge of thalassemia, access to proper treatment and diagnosis can be difficult.[citation needed]


Patients with thalassemia minor usually do not require any specific treatment,[citation needed] unless they have very low HB. Treatment for patients with thalassemia major includes chronic blood transfusion therapy, iron chelation, splenectomy, and allogeneic hematopoietic transplantation.[citation needed]


Medical therapy for beta thalassemia primarily involves iron chelation. Deferoxamine is the intravenously or subcutaneously administered chelation agent currently approved for use in the United States. Deferasirox (Exjade) is an oral iron chelation drug also approved in the US in 2005. Deferiprone is an oral iron chelator that has been approved in Europe since 1999 and many other countries. It is available under compassionate use guidelines in the United States.

The antioxidant indicaxanthin, found in beets, in a spectrophotometric study showed that indicaxanthin can reduce perferryl-Hb generated in solution from met-Hb and hydrogen peroxide, more effectively than either Trolox or Vitamin C. Collectively, results demonstrate that indicaxanthin can be incorporated into the redox machinery of ╬▓-thalassemic RBC and defend the cell from oxidation, possibly interfering with perferryl-Hb, a reactive intermediate in the hydroperoxide-dependent Hb degradation.[8]

Carrier detection

  • A screening policy exists in Cyprus to reduce the incidence of thalassemia, which since the program's implementation in the 1970s (which also includes pre-natal screening and abortion) has reduced the number of children born with the hereditary blood disease from 1 out of every 158 births to almost zero.[9]
  • In Iran as a premarital screening, the man's red cell indices are checked first, if he has microcytosis (mean cell hemoglobin < 27 pg or mean red cell volume < 80 fl), the woman is tested. When both are microcytic their hemoglobin A2 concentrations are measured. If both have a concentration above 3.5% (diagnostic of thalassemia trait) they are referred to the local designated health post for genetic counseling.[10]

In 2008, in Spain, a baby was selectively implanted in order to be a cure for his brother's thalassemia. The child was born from an embryo screened to be free of the disease before implantation with In vitro fertilization. The baby's supply of immunocompatible cord blood was saved for transplantation to his sister. The transplantation was considered successful.[11] In 2009, a group of doctors and specialists in Chennai and Coimbatore registered the successful treatment of thalassemia in a child using a sibling's umbilical cord blood.[12]


Generally, thalassemias are prevalent in populations that evolved in humid climates where malaria was endemic. It affects all races, as thalassemias protected these people from malaria due to the blood cells' easy degradation.

Thalassemias are particularly associated with people of Mediterranean origin, Arabs, and Asians.[13] The Maldives has the highest incidence of Thalassemia in the world with a carrier rate of 18% of the population. The estimated prevalence is 16% in people from Cyprus, 1%[14] in Thailand, and 3-8% in populations from Bangladesh, China, India, Malaysia and Pakistan. There are also prevalences in descendants of people from Latin America and Mediterranean countries (e.g. Greece, Italy, Portugal, Spain, and others). A very low prevalence has been reported from people in Northern Europe (0.1%) and Africa (0.9%), with those in North Africa having the highest prevalence. It is also particularly common in populations of indigenous ethnic minorities of Upper Egypt such as the Beja, Hadendoa, Sa'idi and also peoples of the Nile Delta, Red Sea Hill Region and especially amongst the Siwans.


Epidemiological evidence from Kenya suggests another reason: protection against severe malarial anemia may be the advantage.[15]

People diagnosed with heterozygous (carrier) ╬▓ thalassemia have some protection against coronary heart disease.[16]



Last Updated on Monday, 04 July 2011 14:45