Each column keeps its native condition scope. Initial features are displayed alphabetically, not ranked by clinical importance. Counts remain separate, and an empty cell does not mean a feature cannot occur.
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Ancestor membership does not transfer phenotype values between groups.","importantHtml":""},"sections":[{"bodyHtml":"Variants (also called mutations) in multiple genes have been found to cause CDA. Variants in these genes cause CDA by disrupting the normal development of red blood cells (erythropoiesis). In people with CDA, immature red blood cells called erythroblasts are unusually shaped and have other abnormalities. These abnormal erythroblasts either develop into irregular red blood cells or do not develop at all. Irregular red blood cells are quickly removed from circulation. The cells go to the spleen for destruction, and the resulting iron goes to the liver to be processed. The overall shortage of healthy red blood cells leads to the characteristic signs and symptoms of CDA, including anemia, hepatosplenomegaly, and iron overload.
CDA type I is caused by variants in the CDAN1 or CDIN1 gene. These genes provide instructions for making proteins that can attach (bind) to each other and play roles in cell division and erythropoiesis. In at least 10 percent of cases of CDA type I, the cause of the condition is unknown.
CDA type II is caused by variants in the SEC23B gene. This gene provides instructions for making a protein that is involved in the transport of other proteins within cells. During erythropoiesis, this protein may help ensure that proteins are transported to the areas where they are needed.
CDA type III is caused by variants in either the KIF23 or RACGAP1 gene. The KIF23 and RACGAP1 genes provides instructions for making proteins that can bind to each other to form a complex. This complex plays a critical role in the step of cell division in which the dividing cells separate from one another (cytokinesis). The complex also appears to be particularly important in the bone marrow where red blood cells grow and divide (proliferate).
CDA type IV is caused by variants in the KLF1 gene. This gene provides instructions for making a protein that regulates the activity of genes involved in erythropoiesis.
","key":"forms","title":"What causes Congenital dyserythropoietic anemia?"},{"bodyHtml":"The signs and symptoms of CDA can include tiredness (fatigue), weakness, yellowing of the skin and eyes (jaundice), and an enlarged liver and spleen (hepatosplenomegaly). CDA also causes the body to absorb too much iron (iron overload), which can damage tissues and organs.
There are multiple types of CDA. Each type has a different genetic cause and distinct but overlapping patterns of signs and symptoms.
CDA type I is characterized by moderate to severe anemia that typically begins in childhood or adolescence, although the condition can be detected before birth in some cases. In addition to the signs and symptoms common to all types of CDA, individuals with CDA type I can have skeletal issues, including short stature or abnormalities of the fingers or toes.
The anemia associated with CDA type II can range from mild to severe, and it usually develops in adolescence or early adulthood. Individuals with CDA type II may develop hard deposits in the gallbladder called gallstones in addition to the usual signs and symptoms of CDA.
CDA type III can result in anemia that ranges from mild to severe, depending on the genetic cause, and typically begins in infancy or childhood. Some people with CDA type III do not receive a diagnosis until later in life because they have very mild symptoms. In some cases, individuals with CDA type III develop a blood disorder known as monoclonal gammopathy, which can lead to a cancer of white blood cells (multiple myeloma). Some people with CDA type III have eye abnormalities that can cause vision impairment.
CDA type IV is characterized by moderate to severe anemia that typically develops early in life, although the condition can be detected before birth in some cases. Affected individuals can have extensive swelling caused by fluid accumulation before birth (hydrops fetalis). In addition to the signs and symptoms that are common to all types of CDA, individuals with CDA type IV often have short stature.
Source: MedlinePlus Genetics
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