Hereditary Elliptocytosis
An inherited condition that makes red blood cells oval-shaped
Quick Facts
- Type: Inherited blood disorder
- Cell shape: Oval or elongated red blood cells
- Inheritance: Usually passed down in families
- Most common course: Often mild or without symptoms
Overview
Hereditary elliptocytosis is an inherited condition that affects the shape of red blood cells. Instead of the usual round, disc-like form, the cells are oval or elongated, like an ellipse. This happens because of differences in the proteins that give the red blood cell membrane its strength and flexibility.
Most people with hereditary elliptocytosis have a mild form and few or no symptoms, often learning of it only when a blood test is done for another reason. In a smaller number of people, the abnormally shaped cells break down too quickly, which can lead to anemia. The severity varies widely depending on the specific genetic change.
Symptoms
Many people have no symptoms at all. When symptoms occur, they relate to red blood cells breaking down (hemolysis) and may include:
- Fatigue and weakness from anemia
- Pale skin
- Yellowing of the skin or eyes (jaundice)
- An enlarged spleen, which may cause discomfort in the upper left abdomen
- Dark urine in episodes of faster cell breakdown
A more severe form can appear in newborns, sometimes causing significant jaundice and anemia that needs treatment.
Causes
Hereditary elliptocytosis is caused by inherited changes in the genes that make the proteins of the red blood cell membrane, such as spectrin. These proteins normally form a flexible internal scaffold that lets the cell keep its round shape and squeeze through small blood vessels.
When these proteins are altered, the membrane is weaker and the cells take on an oval shape. In milder forms the cells survive nearly normally, while in more severe forms they are fragile and break down faster than the body can replace them. The condition is usually passed from a parent to a child. In most families the gene is inherited in a dominant pattern, meaning a single altered copy is enough to change the shape of the red cells. The severity can vary even among relatives who carry the same change, which is why some family members have symptoms while others do not.
Risk Factors
- A family history of hereditary elliptocytosis or unexplained anemia
- Inheriting the gene change from one or both parents
- Ancestry from regions where related red cell variants are more common
The condition is present from birth, so the main risk factor is inheritance rather than lifestyle.
Diagnosis
Diagnosis usually starts with examining the red blood cells and assessing whether they are breaking down.
- Blood smear: looking at a sample under a microscope reveals the characteristic oval-shaped cells
- Complete blood count: to check for anemia
- Tests for hemolysis: blood tests that show whether red cells are breaking down faster than normal
- Family and genetic testing: reviewing family history and, in some cases, genetic testing to clarify the type
Treatment
Treatment depends on how much the condition affects the person. Many need no treatment at all.
- Monitoring: people with mild disease and no anemia are simply followed over time
- Folic acid: a supplement may be advised when red cells are turning over faster, to support new cell production
- Transfusions: rarely needed, mainly for severe anemia, especially in newborns
- Spleen removal (splenectomy): considered in severe cases, as it can reduce red cell destruction; this is reserved for select situations because of its own risks
Newborns with a severe form may need treatment for jaundice and anemia, which usually improves over the first months of life.
Prevention
Because hereditary elliptocytosis is inherited, it cannot be prevented. Management focuses on monitoring and supporting affected people.
- Families with the condition may find genetic counseling helpful when planning a family
- Reporting symptoms of anemia allows timely support
- Routine follow-up helps detect any worsening
When to See a Doctor
See a doctor if you or your child have ongoing tiredness, paleness, yellowing of the skin or eyes, or discomfort in the upper left abdomen, especially with a family history of a blood disorder. Seek prompt care if you notice:
- Worsening jaundice, particularly in a newborn
- Sudden severe fatigue or shortness of breath
- Dark urine with tiredness, which can signal faster red cell breakdown
A doctor can confirm the diagnosis and determine whether any treatment is needed.
Frequently Asked Questions
Is hereditary elliptocytosis serious?
For most people it is mild and causes no symptoms, often discovered only on a routine blood test. A smaller number have a more severe form in which red cells break down faster, leading to anemia. Severity depends on the specific genetic change.
What causes the red cells to be oval?
Inherited changes in the proteins that form the red blood cell membrane, such as spectrin, weaken its internal scaffold. As a result, the cells lose their normal round shape and become oval or elongated.
Does hereditary elliptocytosis need treatment?
Often not. People with mild disease and no anemia simply need monitoring. Those with faster red cell breakdown may take folic acid, and rarely, severe cases need transfusions or removal of the spleen.
Can it be passed to my children?
Yes. It is an inherited condition usually passed from a parent to a child. Genetic counseling can help families understand the chances of passing it on and what it might mean for a child.
What symptoms should prompt a doctor visit?
See a doctor for ongoing fatigue, pale skin, yellowing of the skin or eyes, or upper left abdominal discomfort, especially with a family history. Worsening jaundice in a newborn or sudden severe fatigue needs prompt attention.
References
- MedlinePlus, U.S. National Library of Medicine. Hereditary elliptocytosis.
- National Heart, Lung, and Blood Institute (NHLBI). Hemolytic Anemia.
- National Organization for Rare Disorders (NORD).
- Genetic and Rare Diseases Information Center (GARD).