X-linked Sideroblastic Anemia

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This entry is adapted from the peer-reviewed paper https://medlineplus.gov/genetics/condition/x-linked-sideroblastic-anemia

X-linked sideroblastic anemia is an inherited disorder that prevents developing red blood cells (erythroblasts) from making enough hemoglobin, which is the protein that carries oxygen in the blood.

genetic conditions

1. Introduction

People with X-linked sideroblastic anemia have mature red blood cells that are smaller than normal (microcytic) and appear pale (hypochromic) because of the shortage of hemoglobin. This disorder also leads to an abnormal accumulation of iron in red blood cells. The iron-loaded erythroblasts, which are present in bone marrow, are called ring sideroblasts. These abnormal cells give the condition its name.

The signs and symptoms of X-linked sideroblastic anemia result from a combination of reduced hemoglobin and an overload of iron. They range from mild to severe and most often appear in young adulthood. Common features include fatigue, dizziness, a rapid heartbeat, pale skin, and an enlarged liver and spleen (hepatosplenomegaly). Over time, severe medical problems such as heart disease and liver damage (cirrhosis) can result from the buildup of excess iron in these organs.

2. Frequency

This form of anemia is uncommon. However, researchers believe that it may not be as rare as they once thought. Increased awareness of the disease has led to more frequent diagnoses.

3. Causes

Mutations in the ALAS2 gene cause X-linked sideroblastic anemia. The ALAS2 gene provides instructions for making an enzyme called erythroid ALA-synthase, which plays a critical role in the production of heme (a component of the hemoglobin protein) in bone marrow.

ALAS2 mutations impair the activity of erythroid ALA-synthase, which disrupts normal heme production and prevents erythroblasts from making enough hemoglobin. Because almost all of the iron transported into erythroblasts is normally incorporated into heme, the reduced production of heme leads to a buildup of excess iron in these cells. Additionally, the body attempts to compensate for the hemoglobin shortage by absorbing more iron from the diet. This buildup of excess iron damages the body's organs. Low hemoglobin levels and the resulting accumulation of iron in the body's organs lead to the characteristic features of X-linked sideroblastic anemia.

People who have a mutation in another gene, HFE, along with a mutation in the ALAS2 gene may experience a more severe form of X-linked sideroblastic anemia. In this uncommon situation, the combined effect of these two mutations can lead to a more serious iron overload. Mutations in the HFE gene alone can increase the absorption of iron from the diet and result in hemochromatosis, which is another type of iron overload disorder.

4. Inheritance

This condition is inherited in an X-linked recessive pattern. The gene associated with this condition is located on the X chromosome, which is one of the two sex chromosomes. In males (who have only one X chromosome), one altered copy of the gene in each cell is sufficient to cause the condition. In females (who have two X chromosomes), a mutation would have to occur in both copies of the gene to cause the disorder. Because it is unlikely that females will have two altered copies of this gene, males are affected by X-linked recessive disorders much more frequently than females. A characteristic of X-linked inheritance is that fathers cannot pass X-linked traits to their sons.

In X-linked recessive inheritance, a female with one altered copy of the gene in each cell is called a carrier. Carriers of an ALAS2 mutation can pass on the mutated gene, but most do not develop any symptoms associated with X-linked sideroblastic anemia. However, carriers may have abnormally small, pale red blood cells and related changes that can be detected with a blood test.

5. Other Names for This Condition

Anemia, hereditary sideroblastic
Anemia, sex-linked hypochromic sideroblastic
ANH1
Congenital sideroblastic anaemia
Erythroid 5-aminolevulinate synthase deficiency
Hereditary iron-loading anemia
X chromosome-linked sideroblastic anemia
X-linked pyridoxine-responsive sideroblastic anemia
XLSA

References

Aivado M, Gattermann N, Rong A, Giagounidis AA, Prall WC, Czibere A,Hildebrandt B, Haas R, Bottomley SS. X-linked sideroblastic anemia associatedwith a novel ALAS2 mutation and unfortunate skewed X-chromosome inactivationpatterns. Blood Cells Mol Dis. 2006 Jul-Aug;37(1):40-5.
Ajioka RS, Phillips JD, Kushner JP. Biosynthesis of heme in mammals. BiochimBiophys Acta. 2006 Jul;1763(7):723-36.
Bottomley SS, May BK, Cox TC, Cotter PD, Bishop DF. Molecular defects oferythroid 5-aminolevulinate synthase in X-linked sideroblastic anemia. J BioenergBiomembr. 1995 Apr;27(2):161-8. Review.
Bottomley SS. Congenital sideroblastic anemias. Curr Hematol Rep. 2006Mar;5(1):41-9. Review.
Cazzola M, May A, Bergamaschi G, Cerani P, Rosti V, Bishop DF. Familial-skewedX-chromosome inactivation as a predisposing factor for late-onset X-linkedsideroblastic anemia in carrier females. Blood. 2000 Dec 15;96(13):4363-5.
Cotter PD, May A, Li L, Al-Sabah AI, Fitzsimons EJ, Cazzola M, Bishop DF. Fournew mutations in the erythroid-specific 5-aminolevulinate synthase (ALAS2) genecausing X-linked sideroblastic anemia: increased pyridoxine responsiveness after removal of iron overload by phlebotomy and coinheritance of hereditaryhemochromatosis. Blood. 1999 Mar 1;93(5):1757-69.
May A, Bishop DF. The molecular biology and pyridoxine responsiveness ofX-linked sideroblastic anaemia. Haematologica. 1998 Jan;83(1):56-70. Review.
Nakajima O, Takahashi S, Harigae H, Furuyama K, Hayashi N, Sassa S, YamamotoM. Heme deficiency in erythroid lineage causes differentiation arrest andcytoplasmic iron overload. EMBO J. 1999 Nov 15;18(22):6282-9.
Nemeth E. Iron regulation and erythropoiesis. Curr Opin Hematol. 2008May;15(3):169-75. doi: 10.1097/MOH.0b013e3282f73335. Review.
Sadlon TJ, Dell'Oso T, Surinya KH, May BK. Regulation of erythroid5-aminolevulinate synthase expression during erythropoiesis. Int J Biochem CellBiol. 1999 Oct;31(10):1153-67. Review.

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Subjects: Genetics & Heredity

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Bruce Ren

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Update Date: 24 Dec 2020

Table of Contents

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1. Introduction

2. Frequency

3. Causes

4. Inheritance

5. Other Names for This Condition

References

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1. Introduction

2. Frequency

3. Causes

3.1 The genes associated with X-linked sideroblastic anemia

4. Inheritance

5. Other Names for This Condition

References